Comfort Sync A3
Ultra Smart Thermostat
Installation and Setup Guide
508026-01 10/2021
Copyright 2021
©
Allied Air Enterprises, Inc.
West Columbia, SC, USA
2
Table of Contents
Shipping and Packing List ........................................................................................3
Operating and Storage Environment, Electrical and Dimensions ........................3
Installation Recommendations ................................................................................3
Smart Hub Installation, External Components, LEDs and Terminals ...................3
Smart Hub Installation ............................................................................................3
Smart Hub External Components ..........................................................................4
Smart Hub Push Button Functions .........................................................................4
Smart Hub LED Indicators .....................................................................................5
Smart Hub Terminals and Wiring Requirements ....................................................6
HD Display Installation, External Components and Terminals ............................6
HD Display Attachment ..........................................................................................7
HD Display External Components..........................................................................7
HD Display Terminals .............................................................................................8
Connecting Low Voltage Wiring ...............................................................................8
Control Wiring Requirements .................................................................................8
Discharge Air Temperature Sensor (DATS) (Optional for Indoor Unit) ...................8
Outdoor Air Temperature Sensor (OATS) .............................................................8
Reducing Electrical Noise on Communication Bus - Indoor, outdoor, HD
Display and Smart Hub. .........................................................................................8
Wiring Diagrams .....................................................................................................9
Electric Heat Conguration for Communicating Air Handlers ............................13
Commissioning ........................................................................................................13
Commissioning and Service (Using the Mobile Setup Application) .....................13
Mobile Device Operating System Requirements ........................................................... 14
Establishing a Direct Wireless Connection to the Smart Hub ....................................... 14
Service .......................................................................................................................... 14
Alternative Method ........................................................................................................ 15
Multiple Smart Hub(s) - Group ID .................................................................................. 15
Restarting Smart Hub .................................................................................................... 15
Commissioning (Using the HD Display) ...............................................................15
Boot-up Screen ............................................................................................................. 15
Low Battery Status ........................................................................................................ 15
Dealer Info and Language Selection ............................................................................. 15
Warning Screen ............................................................................................................. 15
General Information ....................................................................................................... 16
Equipment Found Screen .............................................................................................. 16
Non-Communicating Equipment ................................................................................... 16
Reminders ..................................................................................................................... 16
Comfort Sync
®
Zoning .................................................................................................. 16
Setup Airow Per Zone .................................................................................................. 17
Commissioning Completion ........................................................................................... 17
Dealer Control Center .............................................................................................17
Equipment Parameters ........................................................................................18
Tests .....................................................................................................................41
Diagnostics...........................................................................................................41
Installation Report ................................................................................................41
Information ...........................................................................................................41
Dehumidication Settings ......................................................................................42
Dehumidication Setting Options .........................................................................42
Overcooling ..........................................................................................................42
Dehumidication Set Point ...................................................................................42
Advanced Dehumidication Descriptions .............................................................42
Displaying Outdoor Temperature (Sensor) and Indoor Humidity on the
Home Screen............................................................................................................44
Displaying the Outdoor Sensor Temperature on the Home Screen .....................44
Displaying the Indoor Humidity on the Home Screen ..........................................44
Comfort Sync® Zoning ..........................................................................................44
Ventilation (ERV, HRV and Fresh Air Damper) ......................................................45
Ventilation Rates ..................................................................................................45
Energy Recovery Ventilator (ERV) .......................................................................45
Heat Recovery Ventilator (HRV) ..........................................................................45
Fresh Air Damper .................................................................................................45
Zoning Application ......................................................................................................... 45
Operation of Fresh Air Dampers with Environmental Overrides .................................... 45
Ventilation Control Modes ....................................................................................45
Wi-Fi Connection .....................................................................................................46
Performance Reports ..............................................................................................47
Notications .............................................................................................................48
Alert Code Types ..................................................................................................48
Service Notication Codes ...................................................................................48
Alert Codes ..........................................................................................................48
Electrical Troubleshooting .....................................................................................49
Overview ..............................................................................................................49
Denitions ............................................................................................................49
Testing ..................................................................................................................49
Technical Support ...................................................................................................49
Index .........................................................................................................................90
3
Shipping and Packing List
Quantity Description
1
Comfort Sync
®
A3 ultra smart thermostat includes a Smart Hub
and HD Display
4 Mounting screws (#6 X 1.25” pan head)
4 Wall anchors (alligator anged solid wall anchors)
1 Installation and setup guide
1 User guide
1 Warranty certicate
NOTE: Due to Allied Air’s ongoing commitment to quality, features and options
are subject to change without notice and without incurring liability.
Improper installation, adjustment, alteration, service or maintenance
can cause property damage or personal injury. Installation and service
must be performed by a qualied installer and servicing agency.
Operating and Storage Environment, Electrical and Dimensions
• Operating Temperature is 32°F to 104°F (0 to 40°C)
• Shipping and storage temperature range is -4°F to 140°F (-20°C to 60°C)
• Operating humidity range is 10% to 90% non-condensing at 104°F (40°C)
• Storage humidity range is 5% to 95% non-condensing at 104°F (40°C)
• Comfort Sync
®
A3 Smart Hub Power Input: 24VAC, 1AMP at 60Hz.
• Comfort Sync
®
A3 Smart Hub DC Power Output: 12VDC (to HD Display)
• Dimensions (H x W x D):
» HD Display: 7-1/4” x 5” x 1” (184 x 122.5 x 23 mm)
» Comfort Sync
®
A3 Smart Hub: 4-1/2 x 4-/2 x 1-1/2” (114 x 114 x 38 mm)
- antenna length is 7-1/4” (184 mm)
Installation Recommendations
WARNING
Improper installation, adjustment, alteration, ser vice or maintenance can
cause property damage, personal injury or loss of life.
Installation and service must be performed by a li censed professional HVAC
installer (or equivalent) or a service agency.
Before beginning installation, note the type of equipment, number of stages,
and any accessories being installed.
Do
• Read this entire document, noting which procedures pertain to your specic
equipment and system requirements.
• Make sure that all wiring conforms to local and national building and electrical
codes and ordinances.
Do Not
• Install on voltages higher than 30VAC.
• Short (jumper) across terminals on the gas valve or at the system controls
to test installation. This will damage the thermostat and void the warranty.
• Exceed 300 feet (91 meters) run when using 18AWG or 22AWG thermostat
wire or larger (shielded or unshielded).
• Allow power load from any thermostat connection to be more than 1 AMP.
Smart Hub Installation, External Components, LEDs and Terminals
Smart Hub InStallatIon
1. Things to consider when installing the Smart Hub:
• Install near the indoor unit such that there is a direct path to the
approximate location of the home Wi-Fi access point (the signal is not
blocked by the indoor unit or duct work, for example).
• Can be attached to a vertical surface such as a wall stud or roof truss
web, or to a horizontal surface such as a oor or ceiling joist, or a roof
rafter.
• Smart Hub antenna should be positioned such that it is roughly vertical,
no matter the orientation of the Smart Hub itself.
• Do not install the Smart Hub on the indoor unit, duct work, or other
equipment that could induce vibration in the Smart Hub.
• Do not install the Smart Hub on or near large metal objects. This could
adversely affect the range and directional coverage of the Smart Hub
Wi-Fi signal.
• If the Smart Hub MUST be installed on a metal object, orientate the
antenna perpendicular to the metal surface.
• In all cases, the Smart Hub antenna orientation may need to be
adjusted to obtain best Wi-Fi results.
2. Use the procedure outlined in “Figure 1. Smart Hub Installation” on page
4 to install the Smart Hub controller.
4
1/4”
STRIP 1/4” INSULATION FROM
END OF EACH CONTROL WIRE
A
B
D
USE SMART HUB AS TEMPLATE TO MARK DESIRED MOUNTING
LOCATIONS ON WALL OR STUD.
CAUTION: DO NOT OVERTIGHTEN LOWER MOUNTING SCREW, MAY
DAMAGE SMART HUB.
SECURE SMART-HUB TO
WALL WITH
FIELD-PROVIDED
FASTENERS
RAER
TNORF
KEYHOLE
THROUGH-HOLE
C
MAKE CONNECTIONS TO SMART HUB
SCREW TERMINALS USING WIRING
DIAGRAMS PROVIDED
TERMINALS
(screw type)
+
-
COMMBUS
A B
R i+ I- C
ACC1 ACC2
+
-
COMMBUS
A B
R i+ I- C
ACC1 ACC2
Figure 1. Smart Hub Installation
3. For low voltage wiring connections use diagrams in section titled
“Connecting Low Voltage Wiring” on page 8.
IMPORTANT
Do not install smart hub in location were direct exposure to condensation or
dripping water is possible.
Smart Hub ExtErnal ComponEntS
System Status LED
System Commissioning
Status LED
USB Port
Manual Reboot Button
Terminal Connection Access Cover
Antenna
Figure 2. Smart Hub Indicators and External Components
Smart Hub puSH button FunCtIonS
The Smart Hub push button is for rebooting. Press and hold the button for ve
seconds to reboot the Smart Hub.
The push button has a LED associated with it that indicates the status of the
Smart Hub commissioning state (see “Table 1. System Status LED Indicators”).
5
Smart Hub lED InDICatorS
When alarms are present, you may review alarm(s) listed either on the homeowner notication screen or the menu / settings > advanced settings > dealer
control center > notications screen.
Alert codes which require manual clearing can only be done under the dealer control center > notication screen.
Table 1. System Status LED Indicators
System Status LED
System Commissioning
Status LED
Smart Hub
+
-
COMMBUS
A B
R i+ I- C
ACC1 ACC2
System Status LED
LED
Color
Status Description
Green
System is
normal
A solid green LED indicates no system errors are detected. System
operating as designed.
Red
HVAC
Fault
System has critical alert which needs attention.
Amber Wi-Fi Error
Blinking amber LED indicates either Wi-Fi is not connected, no Wi-Fi is
within range, or and Wi-Fi hardware error. Could also indicate intermittent
Wi-Fi connection.
Magenta
Thermostat
Error
Blinking magenta LED indicates HD display not connected. (see “Table 2.
Communication Error Troubleshooting
(HD Display to Smart Hub)” on page 6)
Cyan
HVAC
Error
Indoor unit is not connected or unable to communicate.
Commissioning Status LED
Blue
System is
normal
No mobile device is directly connected using Wi-Fi to the Smart Hub.
Green
Blinking green LED indicates the commissioning button has been activated and the Smart
Hub is waiting for a connection with a mobile device.
Green A solid green LED indicates a mobile device is connected to the Smart Hub.
• If multiple errors are present, the system status LED will display each active error for one second on and
one second off and then display the next error if present.
• The system will continue to cycle through all active errors.
• System status errors are displayed in the following priority: HVAC, thermostat and then Wi-Fi.
6
Table 2. Communication Error Troubleshooting
(HD Display to Smart Hub)
Possible Connection Issues
Comfort Sync
®
A3 Smart
Hub - System Status LED
One communication wire at the Smart
Hub COMM BUS A or B terminals is
disconnected.
Flashing Magenta LED
Both communication wires – at
the Smart Hub COMM BUS A or B
terminals are reversed.
Flashing Magenta LED
Power wires at Smart Hub 12VDC +
and - terminals are disconnected.
Flashing Magenta LED
If terminals are connected correctly,
then check HD Display mounting to
subbase. HD Display may not be
secured correctly to subbase.
Flashing Magenta LED.
HD Display screen may be
either blank or a message
indicating Comfort Sync
®
A3
cannot communicate with the
equipment.
Smart Hub tErmInalS anD WIrIng rEquIrEmEntS
Table 3. Smart Hub Terminal Designations, Order and Wiring
Requirements
Terminal
Designation
Description Thermostat Wiring
R 24VAC input 18AWG unshielded
I+ RS-BUS I+
22AWG shielded
(recommended)
(2-pair conductor only)
I- RS-BUS I-
C 24VAC return 18AWG unshielded
ACC1 Accessory 1 and 2 (typically
can be used for 1 or 2
speed ventilators and fresh
air dampers)
18AWG unshielded
ACC2
12+ 12VDC output 18AWG unshielded
A Communications bus A 22AWG shielded
(recommended)
(2-pair conductor only)
B Communications bus B
12- 12VDC return 18AWG unshielded
IMPORTANT
Use 2-pair, 18AWG unshielded thermostat cable (eld-provided) for power
terminals (R, C, 12+ AND 12-). Recommend using 2-pair 22AWG shielded
thermostat cable for communications terminals (I+, I-, A and B) which will
help eliminate any noise interference.
HD Display Installation, External Components and Terminals
Use the following procedure for installation of the subbase where existing
thermostat wiring does not exist:
1. Unpack the HD Display and subbase.
2. Determine the best location to install either the subbase. Ideal location
should be located away from outside wall, direct sunlight or discharge air
vents.
3. Cut or drill a small hole for thermostat wiring.
3/8” (10 mm)
Diameter Hole
4. Pull about three inches (75mm) of thermostat wire through the opening
and remove the outer thermostat wire jacket.
Seal wire hole in wall to prevent
cold or hot air from affecting temperature
sensor in display.
IMPORTANT
Seal wire hole in wall to prevent cold or hot air from affecting temperature
sensor in HD Display.
5. Strip 1/4” (6 mm) insulation from end of each wire.
1/4”
7
6. Use a level to align either the subbase on wall horizontally.
7. Use the subbase as a template to mark the desired mounting hole locations
on the wall.
Use the subbase as a template to
mark the desired mounting hole
locations on the wall.
HD Display Subbase
(Rear View)
8. Drill 3/16” (5 mm) holes at marked locations on the wall for anchors. Then
insert wall anchors into holes until ush with the wall.
Drill Holes
Insert in hole until flush with wall.
WARNING
DO NOT over-tighten mounting screws. Doing so my distort the subbase
plastic housing and cause connection issues when attaching the HD display.
9. Secure subbase with provided #6 x 1.25” pan-head screws (4).
10. Connect thermostat wiring to subbase screw terminals referencing
provided wiring diagrams in this guide.
HD DISplay attaCHmEnt
1. Hold the HD Display by the edges, line it up with the subbase (horizontal
position), and move the HD Display toward the subbase.
2. Center the cavity on the back of the display over the subbase.
3. Gently press on the edges of the HD Display until you hear the mounting
snaps engage. Be careful not to apply force directly on the glass.
NOTE: Once the HD Display is connected, it may take up to 45 seconds for it
to power up.
4. To remove the HD Display from the subbase, grasp the left and right edges
of the HD Display and gently pull towards yourself.
NOTE: If the HD Display is removed from the subbase base, the HD Display
will shut down and will not be able to communicate with the system.
System can be controlled from mobile devices or consumer web
portals once registration has been completed.
5. Do not remove the label covering the HD Display screen until after power
is applied to the system.
HD DISplay ExtErnal ComponEntS
• Proximity sensor - Detects a person approaching the HD Display. If the
HD Display is in Screen Saver mode and the Proximity Sensor setting is
enabled, the proximity sensor takes the HD Display out of screen saver mode
automatically and returns to the home screen when someone approaches.
• Humidity sensor - This is the intake location for the humidity sensor. Do not
block.
• Power button - Turns off the HD Display when pressed and held for about
ve (5) seconds.
• microSD card slot - Not functional, for future use.
• Micro USB connector - Not functional, for future use.
Proximity and Ambient Light Sensors
microSD slot
micro USB port
power button
humidity sensor
air intake
humidity sensor
air discharge
temperatur sensor
Subbase attached
Figure 3. HD Display Components
8
HD DISplay tErmInalS
Table 4. Smart Hub Terminal Designations and Order
Terminal Designation Description
12+ 12VDC output
A Communications bus A
B Communications bus B
12- 12VDC return
Connecting Low Voltage Wiring
The following diagrams in this section illustrates the basic Allied Air control
wiring for all compatible components.
Control WIrIng rEquIrEmEntS
The following is the wiring specication requirements for installation of this
system.
• Comfort Sync
®
A3 wiring size is 18# AWG.
• Maximum total length of all connections combined is 1500 feet (457 meters).
• Maximum length between components is 300 feet (90 meters).
DISCHargE aIr tEmpEraturE SEnSor (DatS) (optIonal For InDoor unIt)
Installation of discharge air temperature sensor (DATS) (88K38) must comply
with the following requirements:
• Installed downstream of the heat exchanger or electric heat elements.
• It must be placed in free airow, where other accessories (such as humidiers,
UV lights, etc.) will not interfere with its accuracy.
• Wiring distance between the integrated furnace and air handler controls or
damper control module and the discharge air sensor must not exceed 10 feet
(3 meters) when wired with 18# AWG thermostat wire.
• DATS is highly recommended for all systems that include a variable capacity
outdoor unit in order to provided more precise dehumidication operation.
outDoor aIr tEmpEraturE SEnSor (oatS)
The optional outdoor air (temperature) sensor (OAS) (X2658) wiring distance to
the Comfort Sync
®
A3 should not exceed 150 feet (45 meters) when wired with
minimum 22 #AWG (recommend 18 #AWG) dedicated 2-conductor thermostat
cable or two wire shielded. Installation of OAS must comply with the following
requirements:
• Sensor wiring must be run to avoid touching or being close to high voltage
wiring and light ballast.
• Choose a protected outdoor location away from direct sunlight or other heat
sources (usually on the north side of the building).
• Ensure that water will neither collect on, nor wash over the sensor.
• Do not locate the sensor near driveways or similar heat-absorbing masses
which may reect stored heat energy onto the sensor and send inaccurate
information to the thermostat.
• Locate the sensor away from attic and soft vents, or furnace venting pipes.
• Do not locate the sensor directly above an air conditioner or heat pump.
rEDuCIng ElECtrICal noISE on CommunICatIon buS - InDoor, outDoor, HD DIS-
play anD Smart Hub.
Communicating systems requires four thermostat wires between the HD
Display and Smart Hub. Four wires are also used between the Smart Hub and
indoor/outdoor units as well. When a thermostat cable with more than four
wires is used, the extra wires must be properly connected to avoid electrical
noise. The wires must not be left disconnected.
• Use wire nuts to bundle the unused wires at each end of the cable. A single
wire should then be connected to the indoor unit end of the wire bundle
and attached to the “C” terminals as shown in “Figure 4. Thermostat Wire
Termination in Communicating Systems (Electrical Noise)”.
• Keep all communication wiring as far away from the house electrical wiring
and large electrical appliances as possible. Recommended minimal distance
is 15 feet (4.6 meters).
Unused wires
Unused wires
Single wire
to bundle
wire to indoor
terminal “C”.
Single wire
to indoor unit
terminal “C”.
Unused wires
Single wire
to terminal “C”.
Indoor Unit Controller
Outdoor Unit
+12V A B
HD Display
Subbase
-12V
12VDC
12+
COMBUS
A B
Smart Hub
R i+ I- C
ACC1 ACC2
12-
Figure 4. Wire Termination in Communicating Systems
(Electrical Noise) - Typical
IMPORTANT
It is recommended to use 2-pair, 18AWG unshielded thermostat cable (eld-
provided) for power terminals (R, C, 12+ AND 12-). Recommend using 2-pair
22AWG shielded thermostat cable for communications terminals (I+, I-, A
and B) which will help eliminate any noise interference. See “Table 3. Smart
Hub Terminal Designations, Order and Wiring Requirements” on page 6
for further details.
9
WIrIng DIagramS
The following diagrams are typical low voltage wiring connections for various
system congurations.
Communicating
Indoor Unit
Smart Hub
C
i+
i-
R
HD
Display
Subbase
-
COMMBUS
A B
ACC1 ACC2
Communicating
Outdoor Unit
OATS (Optional)
DATS (Optional)
+
B
A
+
-
Figure 5. Comfort Sync
®
A3 with Allied Air Communicating Indoor and
Outdoor Units
24VAC 1- or 2-Stage
Heat Pump
SETUP NOTES:
CUT Y1-Y2 ON-BOARD
MUNICATING)
CUT R-O ON-BOARD LINK
FOR OUTDOOR HEAT
MUNICATING)
ACC1
ACC2
DATS (Optional)
OATS (Optional)
Smart Hub
Communicating
Air Handler Unit
-
COMMBUS
A B
+
HD
Display
Subbase
B
A
+
-
Figure 6. Comfort Sync
®
A3, Allied Air Communicating Air Handler
with 24VAC 1 or 2-Stage Heat Pump
24VAC Outdoor Unit
(1 - or 2-Stage
Air Conditioner)
SETUP NOTE:
CUT Y1-Y2 ON-BOARD LINK FOR
2-STAGE OUTDOOR UNITS
(NON-COMMUNICATING)
ACC1
ACC2
DATS (Optional)
OATS (Optional)
Smart Hub
Communicating
Indoor Unit
-
COMMBUS
A B
+
HD
Display
Subbase
B
A
+
-
Figure 7. Comfort Sync
®
A3, Allied Air Communicating Indoor Unit
with 24VAC Air Conditioner
24VAC
1- or 2-Stage
Non-Communicating
Indoor Unit
If jumber is present between
R and W2 on indoor unit terminals then
removed it. Installed jumper
may cause erroneous Alert Code 125.
ACC1
ACC2
Smart Hub
Equipment
Interface Module
Communicating
Outdoor Unit
-
COMMBUS
A B
+
HD
Display
Subbase
B
A
+
-
Figure 8. Comfort Sync
®
A3 with Equipment Interface Module (EIM),
24VAC Indoor Unit and Allied Air Communicating Outdoor Unit
10
DATS
(Required)
OATS (Optional)
Zone
Sensors
PWR
D+
D-
C
PWR
D+
D-
C
PWR
D+
D-
C
See ComfortSync Zoning Installation instruction for damper connection information.
INDOOR
DOOR” ON DAMPER CONTROL MODULE TO
CONNECT TO THE INDOOR UNIT.
PWR
D+
D-
C
TS
TS
T
T
A
A
T
T
COMFORTSYNC ZONING
SYSTEM
To indoor unit
To ComfortSync
Zoning
If unable to connect two wires
to indoor unit terminals then
pigtail wiring as exampled
here.
DATS
Up to three zone
sensors are supported.
ACC1
ACC2
If TSTAT terminal is present,
DO NOT use.
Smart Hub
-
COMMBUS
A B
+
Communicating
Indoor Unit
Communicating
Outdoor Unit
HD
Display
Subbase
B
A
+
-
Figure 9. Comfort Sync
®
A3, Allied Air Communicating Indoor and Outdoor Units, Comfort Sync
®
Zoning (Damper Control Module) and Zone
Sensors
11
FURNACE (IFC) OR AIR
HANDLER (AHC)
COMMUNICATING
FURNACE
48G96 Relay
GND
IN
120VAC<-------HUMIDIFIER CONNECTIONS------> 24VAC
CHARGE AIR SENSOR
(SEE DAS NOTES)
OPTIONAL OUTDOOR
AIR SENSOR (SEE OAS
NOTES)
ACC1
ACC2
ERV / HRV
24VAC UV Light Applications: In any Allied communicating system, the indoor unit will
NOT have adequate power to to run the 24VAC UV light application. An additional transformer
will be required. UV light wiring connections are independent of the HVAC system operation
(refer to UV light installation instruction.
Humidity Control Applications: The Comfort Sync A3 thermostat can sense humidity and controls
both 24VAC “H” and 120VAC “H” outputs to cycle humdifier based on demand. No other
control or humidistat is required. Optional outdoor air temperature sensor for use with humidifier
(if not already in the system for other function and are typically built into all Allied communicating
outdoor units
Smart
Hub
-
COMMBUS
A B
+
Communicating
Outdoor Unit
HD
Display
Wall-Mount
Smart
Hub
B A
-12V
+12V
-
COMMBUS
A B
+
HD
Display
Subbase
B
A
+
-
Figure 10. Comfort Sync
®
A3 with Humidier Accessory
12
HEPA BYPASS FILTER X2680 HEPA
INTERLOCK KIT
TOR COMMON WIRE
THROUGH CURRENT LOOP.
SEE HEPA INTERLOCK KIT
FOR INSTALLAT ION DETAILS
(POWER COMPANY INTERRUPTION
SYSTEMS ARE WIRED SAME AS
OVERFLOW SWITCH)
CUT
R-DS
W914
DS
R
COMMUNICATING
OUTDOOR UNIT
COMMUNICATING
INDOOR UNIT
COMMUNICATING
THERMOSTAT OR DAMPER
CONTROL MODULE
CONVENTIONAL TERMINALS
FLOAT
SWITCH
FLOAT
SWITCH
COMMUNICATING
INDOOR UNIT
COMMUNICATING
INDOOR UNIT
COMMUNICATING
INDOOR UNIT
CONVENTIONAL
OUTDOOR UNIT
(1 OR 2 STAGE)
COMMUNICATING
OUTDOOR UNIT
COMMUNICATING
FURNACE UNIT
(2 STAGE)
C
C
MAY NEED TO WRAP WIRE MULIPLE TIMES TO
GET AMP DRAW HIGHER (1 AMP) TO MAKE
SENSOR WORK CORRECTLY.
Figure 11. Installing Comfort Sync
®
A3, Communicating Indoor Unit, Float Switch, HEPA Bypass Filter Interlock Kit, Humidier, Relay and
FreezeStat
13
ACC1
ACC2
Communicating
Indoor Unit
Wire Jumper required between ON and RED terminals.
ACC1 is always low-stage for single- and two-stage ventilators.
LOW
ON
RED
YEL
GRN
HI
COM
NO
NC
BLK
HRV/ERV
Terminal Block
Smart Hub
-
COMMBUS
A B
+
HD
Display
Subbase
B
A
+
-
Figure 12. Comfort Sync
®
A3 with Ventilation
(Fresh Air Damper, ERV and HRV)
Electric Heat Conguration for Communicating Air Handlers
OUTDOOR
AIR SENSOR
HEAT
1234
COOL
1234
DELAY
12 34
ADJUST
NORM + −
HUMIDIFICATION
SMART AUTO
1234
BLOWER
ONLY CFM
100
11 5
130
85
Y1−Y2
2−STAGE
COMPR
R−O
HEAT
PUMP
R−DS
DEHUM
C
W1
W2
G
Y2
Y1
C
R
DH
H
L
O
DS
W3
FUSE3 AMP
XFMR 24V
24 VAC
COM
3
6
9
1
4
7
XFMR LINE
G
2
5
8
P8
L1
L2
L2 L1
INDOOR
BLOWER
POWER
EARTH
INDOOR BLOWER
SIGNAL
45 6
12 3
A92
INTEGRATED
CONTROL
OUTDOOR UNIT
LINK
I +
I −
I +I −RC
I +I −RC
THERMOSTAT
DH
DISCHARGE
AIR SENSOR
PUSHBUTTON LED
Figure 13. Air Handler Control
IMPORTANT
After electric heat strips are installed, but prior to running the thermostat
installer setup, electric heat must be manually congured to detect the
number of electric heat sections.
This procedure is for conguring the heat strips so that they will be detected
by the thermostat:
• Power must be applied to the air handler but NOT to the Smart Hub.
• Disconnect any communication wiring between the Smart Hub and indoor
unit prior to electric heat discovery.
• The air handler control must be in idle mode (decimal blinks at 1 Hertz—0.5
second ON, 0.5 second OFF to use the following procedure.
1. Select eld test mode—press and hold the push button until solid “–”
appears; release button. Display will blink.
2. Push and hold button and wait for the display LED to show “H” (capital H),
then release the button.
3. The air handler control cycles the indoor blower motor “on” to the selected
heat speed and stages the electric heat relays “on” and “off” to automatically
detect the number of electric heat sections. The air handler control stores
the number of electric heat sections, then automatically exits “Field Test
Mode”.
4. The thermostat will now detect the heat strip information stored in the air
handler control.
5. Turn off power and connect all low voltage wiring (power and communication
to and from the Smart Hub).
6. After completing the commissioning of the system then check to see if you
have electric heat or emergency heat.
Commissioning
CommISSIonIng anD SErvICE (uSIng tHE mobIlE SEtup applICatIon)
This application tool is used by dealers to commission a Comfort Sync
®
A3
ultra smart thermostat using a Wi-Fi enabled mobile device.
A temporary Smart Hub local network provides a means for a mobile device
using the Comfort Sync
®
dealer mobile app application to directly communicate
with the Smart Hub.
NOTE: The Comfort Sync
®
dealer mobile app running on a mobile device
cannot connect to the Smart Hub through the Internet or home Wi-Fi
network.
To use the Comfort Sync
®
dealer mobile app, the mobile device must be:
• Wi-Fi capable
• Located in the home near the Smart Hub
14
NOTE: A router with Bonjour capabilities is required for this function. Check
the router features if the Smart Hub does not connect. Apple Bonjour
®
is an implementation of Zero-conguration networking (Zeroconf),
a group of technologies that includes service discovery, address
assignment, and host name resolution.
Mobile Device Operating System Requirements
The Comfort Sync
®
dealer mobile app is available for both IOS 6.0 and higher
(App Store) and Android 4.1 and higher (Google Play).
Establishing a Direct Wireless Connection to the Smart Hub
IMPORTANT
If the connection between the Comfort Sync
®
dealer mobile app and Smart
Hub is idle for three (3) minutes, the Smart Hub will auto-disconnect from the
mobile device. Repeat procedures to reconnect.
1. Download and install the Comfort Sync
®
dealer mobile app
2. Apply power to the system.
NOTE: At this point, it is recommended that when using the Comfort Sync
®
Mobile Setup application to commission the system, remove the HD
Display from the subbase before starting.
NOTE: Once commissioning is completed you may reattach the HD Display
to the subbase.
3. Go to the Smart Hub and press the commissioning button located on
the side of the unit (see “Figure 2. Smart Hub Indicators and External
Components” on page 4 for location of button).
4. The commissioning status LED will start blinking green for two minutes.
During this time the Smart Hub will broadcast its Wi-Fi identier (SSID).
5. Go to your mobile device’s Wi-Fi connection tool and locate the Smart
Hub Wi-Fi broadcast identier. A typical example of a identier (SSID) is
DIRECT-XY12-3456.
NOTE: Refer to your mobile device’s owners manual on how to use your Wi-Fi
Connection tool.
6. Connect to the Smart Hub by using the last eight digits of the Smart Hub
SSID as the password. In this example, it would be XY123456).
7. Once the mobile device is connected to the Smart Hub, the commissioning
Status LED will turn solid green.
8. Start the Comfort Sync
®
dealer mobile app and make sure you are
connected to the correct Smart Hub by checking the serial number.
9. Touch the remote-in tab on the Comfort Sync
®
dealer mobile app home
screen. This will take you to the commissioning screen.
10. You can use the information provided in “Commissioning (Using the HD
Display)” on page 15 to complete the commissioning process using the
Comfort Sync
®
dealer mobile app.
11. If the system has not been commissioned it will go to commissioning
screen automatically. If the system has already been commissioned it will
go to dealer control center.
12. Once the commissioning is completed, exit the Comfort Sync
®
dealer
mobile app.
13. Go to the mobile device’s Wi-Fi tool and manually disconnect from the
Smart Hub.
14. Once disconnected, the Smart Hub commissioning LED will change to
solid blue.
15. Reinstall the HD Display on the subbase.
Service
To use Comfort Sync
®
dealer mobile app as a service tool, the commissioning
of the system must have already been completed.
NOTE: Currently there is a default timer for 30 minutes to complete any service
procedures before the Smart Hub will automatically log you out. The
duration of the timer cannot be adjusted.
1. Download and install the Comfort Sync
®
dealer mobile app if not already
installed.
2. Go to the Smart Hub and press the commissioning button once.
3. The LED will start blinking green for two minutes. During this time the
Smart Hub will broadcast its Wi-Fi identier (SSID).
4. If this is the rst time connecting to the target Smart Hub then go to your
mobile device’s Wi-Fi connection tool and locate the Smart Hub Wi-Fi
broadcast identier. A typical example of a identier (SSID) is DIRECT-
XY12-3456.
5. If your mobile device had already connected previously to the target Smart
Hub, then touch the applicable Smart Hub SSID on the list and skip to step
7.
NOTE: Refer to your mobile device’s owners manual on how to use our Wi-Fi
Connection tool.
6. Connect to the Smart Hub by using the last eight digits of the Smart Hub
SSID as the password (XY123456) for example.
7. Once connected to the mobile device the Smart Hub commissioning LED
will turn solid green.
8. Start the Comfort Sync
®
dealer mobile app and make sure you are
connected to the correct Smart Hub by checking the serial number.
15
9. Touch the remote-in tab on the Comfort Sync
®
dealer mobile app home
screen.
10. If the system has not been commissioned it will launch the commissioning
screen. If the system has already been commissioned it will go to dealer
control center.
11. Once servicing is completed, exit the Comfort Sync
®
dealer mobile app.
12. Go to the mobile device’s Wi-Fi tool and manually disconnect from the
Smart Hub.
13. Once disconnected the Smart Hub LED will change to a solid blue.
Alternative Method
From the home screen, go to menu > settings > advanced settings > pair
Smart Hub to Comfort Sync
®
dealer mobile app selection. It will auto connect
to dealer application and start you at the dealer control center screen. The
following screen will appear and show the status of the connection. Once
connected the screen will automatically disappear.
view dealer dashboard
restart
pair Smart Hub to icomfort dealer mobile app
advanced settings
wi-fi local
smart away on
off
auto
Feels Like
fan
heat & cool
humidity
iHarmony zoning
notifications
general
display
account
settings
home info
a
d
vance
d
sett
i
n
g
s
wi-
fi
local
smart
F
ee
l
s
f
a
n
heat
&
h
um
id
iHarm
o
noti
f
ic
a
gener
a
displa
y
accou
nt
s
ett
i
n
g
s
home in
fo
vi
vi
ew
ew
d
d
ea
ea
le
le
r
r
da
da
sh
sh
bo
bo
ar
ar
d
d
aw
w
a
ay
y
Li
k
ke
e
&
c
c
oo
l
i
ty
y
o
n
ny
y
z
z
o
a
ti
i
ons
al
y
Connect to the Smart Hub from
the dealer Comfort Sync mobile app
now broadcasting...
stop
Figure 14. Pairing
Multiple Smart Hub(s) - Group ID
Multiple Smart Hubs in a home can be assigned to a group (up to nine groups
with up to ve (5) Smart Hubs in each group). All Smart Hubs in a group can
communicate with other Smart Hubs in the same group over the home Wi-Fi
network.
Default Group ID 1. Range is 1 to 9.
NOTE: If a Smart Hub is set to Group 0, then there is no connectivity with
another Smart Hub.
Group IDs can be changed by going to menu > settings > advanced settings
> view > dealer control center > equipment > smart hub.
Restarting Smart Hub
Pressing the Smart Hub button for more than ve seconds will reboot the
Smart Hub.
CommISSIonIng (uSIng tHE HD DISplay)
The following procedures are written for commissioning the system using the
HD display interface.
When power is rst applied to the system all Comfort Sync
®
devices attached
to the system (air handler or furnace, outdoor unit or zoning control) will
automatically be congured using optimal factory default settings based on
system type, capacity and other conguration considerations.
Boot-up Screen
When power is applied to the system, the HD Display will display a welcome
screen.
If there is an issue with communication between any components attached to
the thermostat, a critical alert message will appear on the screen. The alert
message will provide detail information concerning the possible cause. Once
the issue is corrected and power is restored to the system the rst screen in
the initial commissioning sequence will appear.
Low Battery Status
If a critical low battery screen is displayed, the system will automatically start
charging the HD Display internal battery. On the screen the word “charging”
will appear. Once “charging” disappears (typically 3 to 10 minutes) then the
display will automatically start-up.
Dealer Info and Language Selection
The rst screen in the commissioning sequence is the dealer information
screen and language selection tool. Supported languages are English, French
and Spanish. The drop-down selection tool is located in the upper right-hand
corner of the screen.
Dealer information and/or phone number can be added. Once the system
is connected to the Internet, the remaining information will be populated
automatically by the Allied Air server based on the dealer information or phone
number entered. All information can be entered manually if desired however.
Information that can be manually entered is name, email website, dealer
address which includes address 1, address 2, city, state and zip/postal code.
Once completed touch continue.
Warning Screen
If either the Dealer Information or phone number is NOT provided, a warning
screen will appear. The warning screen will provide information on the limitation
imposed on the system if this information is not provided. Touch no to return
to the previous screen to complete the information requested or touch yes to
continue.
16
General Information
On this screen general information needs to be veried or changed. Touch
any item to change its contents. A pop-up screen will appear that will allow the
information to be added or changed.
1. Select country / region.
2. Select time and date which includes time, date, time zone and daylight
savings time (ON/OFF).
IMPORTANT
Time and date will be auto corrected when the system is connected to
Internet. When connected to Internet, time and date can not be adjusted.
3. Temperature unit (Fahrenheit or Celsius).
4. Once completed touch continue.
Equipment Found Screen
This screen will display any Comfort Sync
®
equipment the system has detected
(air handler, furnace, outdoor unit, Smart Hub and Comfort Sync
®
Zoning
system during initial commissioning of the system.
NOTE: When a Equipment Interface Module (EIM) is used and congured as
either a furnace or air handler, then the component would appear as
either EIM-Furnace or EIM-Air Handler. When using a EIM the outdoor
unit may be either an Allied Air Comfort Sync
®
A3 or any standard
24VAC non-communicating thermostat.
NOTE: Not all equipment may be visible from the equipment found system
screen. Touch and swipe up to access additional information (if
applicable) listed at the bottom of the system box.
If non-communicating equipment needs to be added, it can be done so from
this screen.
Non-Communicating Equipment
When selecting the non-communicating (24VAC) equipment icon a screen will
appear listing equipment that can be added. When selecting an applicable
component, a green check will appear next to the item. The capacity selection
of the outdoor unit will also be displayed on the screen after selecting the
applicable outdoor equipment type.
NOTE: A temporary dialog box will appear indicating: Updating - Wait while
we check for dependencies.
NOTE: Selecting an outdoor unit type only appears if a Comfort Sync
®
outdoor
unit is not detected by the system. Selections are one or two-stage
heat pumps or air conditioners. Outdoor unit capacity will also have to
be set. Other non-communicating equipment that can be added are:
» Humidiers
» Dehumidiers
» Auxiliary Dehumidier
» Fresh Air Damper
» 1 or 2 Speed ERV (energy recovery ventilation)
» 1 or 2 Speed HRV (heat recovery ventilation)
Once completed touch done which will display the equipment found screen.
There the additional non-communicating equipment will now be displayed
along with the Comfort Sync
®
equipment. Once completed touch continue.
Reminders
This screen allows you to set reminders as either disabled or 3, 6, 12 or 24
months and also custom by specic date. The other options on this screen is to
trigger the reminder event either by calendar or actual system run-time.
Reminders may be set for Replace lter 1, Replace lter 2, Replace UV bulb,
Replace humidier pad, Maintenance reminder, Ventilation maintenance and
Ventilation lter.
Once a reminder is set for a specic item, touch done to return to the previous
screen. An “expires on date” will appear next to the item just set.
Comfort Sync
®
Zoning
This screen will only appear if the Comfort Sync
®
Zoning is detected. This
screen allows you to rename each zone. You may use the preset names or
any custom name you may desire. If zoning is not applicable, proceed to the
next section.
1. Touch on any zone to rename it. A screen will display that list several
predened names that can be used which are master bedroom, guest
bedroom, kitchen, living room, media room, dining room, library or custom.
When a predene name is selected, a green check-mark will appear next
to the selected name.
2. When creating a custom name, touch custom, enter a name and touch
back to return to the previous screen. A new unique zone name can be
created for all four zones.
3. When completed, touch done to return to the zoning screen and verify the
new name is being used for the specic zone.
4. Once completed touch continue.
17
Setup Airow Per Zone
This screen will allow the installer to setup the airow per zone. The types of
circulation per zone are:
• Blower Circulation Airow (gray) which includes total, assigned, minimum
and maximum airow.
• Heating Circulation Airow (red) which includes total, assigned, minimum
and maximum airow.
• Cooling Circulation Airow (blue) which includes total, assigned, minimum
and maximum airow.
1. Touch on the circled green arrow to touch a specic zone. The that zone
settings will expand to allow the installer to adjust CFMs for each circulation
airow type. Use the plus and minus buttons to adjust CFMs up and down.
2. Once completed touch to continue. The next screen that will appear is the
Dealer Control Center.
Commissioning Completion
Once commissioning is completed, the system will leave you at the Dealer
Control Center. You can either touch exit to go to the main screen or perform
any function listed in the various categories displayed.
Dealer Control Center
This menu provides access for the installer or service technician to perform various functions. Advance equipment congurations, notications, tests, diagnostics,
installation reports and general information about the system.
dealer
control center
equipment
tests
notifications
information
diagnostics
exit
Use to make changes to equipment settings and add or remove
non-communicating equipment or accessories. In addition the reset all
equipment option is available. This will allow the installer to reset all
equipment and reconfigure.
Use to display
system notifications
Use to run test on
system components
Use to run
diagnostics on
system components
Use to display
system information
Exit to Home
screen.
To navigate back to the dealer control center,
touch on the center icon when available
on the top left-hand side of the screen.
<
<
To navigate back to the previous screen, touch
on the left arrow when available.
“Previous Screen
Name”
installation
report
Used to display installation results.
NOTE: This report is not available until after
exiting the dealer control center following the
commissioning procedure. Exit and return to
the dealer control center to view the installation
report.
Figure 15. Dealer Control Center
18
EquIpmEnt paramEtErS
Selections listed in this section are dependent on system hardware conguration. Not all options listed in this section will be available.
NOTE: When changing the default settings for any parameter, there is a possibility that it will affect the settings for another parameter. If this happens, a pop-up
message will be displayed listing the other affected parameters and their new automatically set values.
The following is a complete list of all possible parameters listed under System. Parameters actually available are dependent on the Allied Air communicating
equipment type detected and non-communicating equipment added.
Table 5. Smart Hub Parameters
Parameter
(In alphabetical
order)
Description
About
This screen provides information concerning language supported, equipment type name, control software revision, model, control
mode number, control serial number, control hardware revision, protocol revision number, device product level, 24VAC average power
consumption, 24VAC peak power consumption, compatible devices list, application code memory size and micro-controller part
number.
Auto Changeover
- Humidif.
Deadband
Prevents the Humidication and Dehumidication settings from being closer together than 5% or greater than 10% (Dead-band).
Range is 5 to 10%. Default is 5%. Adjustments are in increments of 1%.
Auto Changeover
- Temp
Deadband
Prevents the Heating and Cooling from being set closer together than 3ºF (1.67°C) or greater than 9ºF (5.0°C) (Dead- band).
Range is 3 to 9°F (1.67 to 5.0°C). Default is 3°F (1.67°C). Adjustments are in increments of 1°F (0.56°C).
Auto
Dehumidication
Overcooling
Threshold
Adjustments are in increments of 1%. This value can automatically be affected by adjusting other parameters. One example would be
when enabling Max Dehumidication Overcooling.
Range is 0 - 10%. Default is 4%.
Aux Heating
Activation
Threshold
This is an adjustment to hasten or delay the aux heat activation. This adjusts how far below the set point the temperature must fall
with the HP at 100% before allowing electric heat to come on.
Range is 0 - 10°F (0.0 to 5.56°C) with increments of 0.25°F (0.14°C). The default setting is 2.5°F (0.83°C).
Denition/Dependencies:
Step Change versus Steady State Modes
• Outdoor temperature below the high balance point or with balance points disabled.
• Heat Pump demand above 95% for 10 minutes.
• Sixty (60) minute temperature rise prediction = less than this Parameter Setting (value)
Result:
The Heating Proportional Integral Algorithm (as set for less, normal, or more aggressive) will begin to stage on the electric heat to
bring the space temperature up to set point.
Synopsis: The LOWER this parameter is set, the quicker the auxiliary heating will respond, in both step change mode and steady
state mode.
19
Table 5. Smart Hub Parameters
Parameter
(In alphabetical
order)
Description
Balance Point Control
If system is set up as dual fuel or heat pump with electric heat and a outdoor temperature sensor connected to Smart Hub, the low and high balance point
settings will appear. The balance points feature requires that a sensed outdoor temperature is provided to the thermostat. The outdoor ambient temperature
can be read from either a:
• Field-installed outdoor temperature sensor (X2658).
• Communicating heat pump. All communicating heat pumps have a factory-installed outdoor temperature sensor.
Options are enabled or disabled. Default is disabled. When enabled, both low and high balance points can be set.
High Balance Point
This setting is used to prevent the furnace or electric heat from heating the structure. (Alert 19 - Minor - Notication only - The outdoor
temperature is higher than the level where the furnace or electric heat is programmed to heat the home.)
Range is -17 to 75°F (-27.22 to 23.89°C). Default is 50°F (10.0°C). Adjustments are in increments of 1°F (0.56°C).
Low Balance Point
Setting used to prevent the heat pump from heating the structure. (Alert 18 - Minor - Notication only - The outdoor temperature is
below the level where the heat pump is programmed to heat the home).
Range is -20 to 72°F (-28.89 to 22.22°C). Default is 25°F (-3.89°C). Adjustments are in increments of 1°F (0.56°C).
NOTE: Dual-Fuel Applications (Communicating Systems Only) - Dual fuel applications, which include both a Heat Pump and a gas
furnace, will provide multiple stages of heating. For example, a two−stage heat pump would deliver two stages of heat. The gas
furnace can add two to four more stages of heat.
CFA Cooling
Discomfort
Threshold
Default is ON. The purpose of this algorithm when set to ON is to detect systems with faults which are causing measurable loss of
comfort and thus, need repair/service intervention.
The algorithm monitors the duration in which the indoor temperature is above the cool set point or below the heat set point and does
not approach the set-point. When an issue is detected alarm 901 is activated.
Cooling Mode
Options are Normal and Comfort. Default is Normal. When changing to Comfort Mode, several parameters are automatically modied
for optimal system operations. The changed parameters are listed on the screen when set to Comfort.
• Normal - This setting cools the home to the desired temperature setting. Once second-stage is activated by timer or differential, it
will not stage down to rst-stage until the next cooling cycle demand.
• Comfort - This is when the system could automatically stage up or down based on the current load demand.
Cooling
Prognostics
This algorithm will determine whether the unit will run out of capacity during the hottest time of summer. It will look back everyday
a minimum of three days to see if there is a pattern and compare it to the hottest day on record for that zip code before triggering
an notication. It must see a pattern before it will trigger the notication. There may be a component or components that will require
attention.
The sensitivity (threshold) selection options are OFF, LOW, MEDIUM, and HIGH. The default is HIGH. The alert code notication is
65545.
DAT Integral
Gain
(Allied Air Variable
capacity Outdoor
Units Only)
The indicates how stable the system is attempting to reach the discharge air temperature set point. You may hear the compressor
hunting (ramping up and down) adjusting to lower setting will correct.
Allied Air advises not to make changes to this setting without rst contacting Allied Air technical support or Allied Air eld technical
consultant.
Default is 3.0. Range is 1.0 to 15.0 in increments of 0.5.
DAT Offset
This parameter is only available when an Allied Air variable capacity outdoor units is installed along with a discharge air temperature
sensor (DATS) Installed is used.
Default is 0.0°F (0.0°C). Range is -5.0°F to 5.0°F (-2.88 to 2.78°C) in increments of 0.5°F (0.28°C).
20
Table 5. Smart Hub Parameters
Parameter
(In alphabetical
order)
Description
DAT Proportional
Gain
(Allied Air Variable
capacity Outdoor
Units Only)
This is how the system attempts to reach the discharge air temperature set point.
Allied Air advises not to make changes to this setting without rst contacting Allied Air technical support or Allied Air eld technical
consultant. Default is 3.0. Range is 1.0 to 15.0 in increments of 0.5.
Dew Point
Adjustment
These settings allow adjustments to the Dew Point setting for the home. Some homes may require an adjustment to help maintain
comfort. If condensation is present on windows, set the adjustment lower, between -15% to -5%. If the home feels dry, set the
adjustment upwards, between +5 to +15%.
Range is -15 to 15°F. Default is 0°F. Adjustments are in increments of 1°F.
NOTE: Dew Point - Adjustment requires an outdoor air (temperature) sensor (OATS) (X2658) and is automatically controlled by the
outside temperature.
Electric Heat
Control Mode
(Single and Two-Stage
Allied Air Communicating
Outdoor Units Only)
In heat pump applications, the electric heat is staged to provide supplemental heat to meet desired comfort levels. When the electric
heat section is used in applications that do not have a heat pump, the elements are staged to limit heat so that it meets heating
demands only.
Electric Heat
Stages During
Defrost
Can increase or decrease the number of electric elements to come on during a call for defrost. (Thermostat will have a demand for
heat.) Range is 0 to 5 electric heat stages. Default is 2. Adjustments are in increments of 1.
NOTE: Selecting 0 will not allow any electric heat stages during defrost.
Electric Heating
Activation
Hold Time
This parameter represents the amount of time the system waits to check the slope of the temperature against the value in “Aux
Heating Activation Threshold” parameter. It checks the room temperature slope after a time to determine if aux heat is needed to
achieve a new room temperature set point) to allow the heating PI to accumulate past 100 (up to 200) which allows electric auxiliary
heat use. Range is 0~15 minutes with a default of 10 minutes. Increments are in 1 minute intervals.
Equipment
Name
A unique name can be assigned to this component. Name can be up to 29 characters. Name can consist of letters, numbers, special
characters and spaces. Default name is subnet controller.
Gas Heat Control
Mode
Options are Staged, Load Tracking Variable Capacity and Variable Capacity. Default is Load Tracking Variable Capacity
Staged: Some furnaces can be congured to provide up to four stages of gas heat operation. When staged heating is chosen, the
Comfort Sync
®
thermostat allows you to choose between 1, 2, 3 and 4 stages of heat. Single-stage heat: rst stage provides 100% of
full capacity.
• Two-stage heat: First stage provides 70% of full capacity; 2nd stage provides 100% of full capacity.
• Three-stage heat: First stage provides 60% of full capacity; 2nd stage provides 80% of full capacity; third stage provides 100% of
full capacity.
• Four-stage heat: First stage provides 35 or 40% of full capacity; second stage provides 60% of full capacity; third stage provides 80%
of full capacity; fourth stage provides 100% of full capacity.
Load Tracking Variable Capacity: Load tracking variable capacity will smoothly track the load (sensible temperature changes) up
and down and adjust the furnace heating rate both ways.
Variable Capacity: Variable capacity only tracks the load upward (rising temperature). Variable capacity uses the thermostat stage
differentials but not stage timers.
21
Table 5. Smart Hub Parameters
Parameter
(In alphabetical
order)
Description
Gas Heating
Activation Temp
Difference
(Allied Air Variable
capacity Heat Pumps)
When the system is dual-fuel and steady state while operating at full HP demand, this is the amount of °F (°C) below the set point that
is allowed before allowing to switch to gas heat.
Range is 0.5 to 10°F (0.0 to -5.56°C). Default is 1.5°F (1.30°C). Adjustments are in increments of 0.5°F (0.14°C).
Heat Cool Stages Locked In
Heat Cool (H/C) Stages Lock in default is disabled (heat/cool stages are turned off separately). If changed to Enabled, heat/cool stages are turned off
together. For non-variable speed systems only.
H/C
Stages
Locked =
Enabled
H/C
Stages
Locked =
Disabled
POINTS:
2nd stage
ON
2nd stage
OFF
1st stage
ON
1st stage
OFF
2nd stage
ON
2nd stage
OFF
1st stage
ON
1st stage
OFF
SP -1.5 SP -1.0 SP -0.5
SP
SP +1.5SP +1.0 0.2+ PS5.0+ PS
Stg1 Differential
Stg2 Differential
Stg2 Differential
Stg1 Differential
Cooling (1- and 2-Stages)
H/C
Stages
Locked =
YES
H/C
Stages
Locked =
NO
1st stage
ON
2nd stage
ON
1st stage
ON
2nd stage
ON
2nd
stage
OFF
1st
stage
OFF
1st
stage
OFF
2nd stage
OFF
SP -1.5SP -1.0 SP -0.5
SP
SP +0.5SP -2.0
Stg1 Differential
Stg2 Differential
SP -2.5SP -3.0
Stg1 Differential
Stg2 Differential
POINTS:
Heating - Non-Heat Pump or Heat Pump w/o backup heat - 1 or 2 stages
22
Table 5. Smart Hub Parameters
Parameter
(In alphabetical
order)
Description
H/C
Stages
Locked =
NO
H/C
Stages
Locked =
YES
POINTS:
3rd stage
ON
1st stage
ON
2nd stage
ON
3rd stage
ON
1st stage
ON
2nd stage
ON
2nd
stage
OFF
3rd stage
OFF
SP -1.5 SP -1.0 SP -0.5
SP
S
P
SP -2.0
Stg1 Differential
Stg3 Differential
Stg2 Differential
SP -2.5SP -3.0SP -3.5
Stg1 Differential
Stg3 Differential
Stg2 Differential
Heating - Heat Pump with Electric - 3 Stage
(2 compressor / 1 backup OR 1 compressor / 2 backup)
H/C
Stages
Locked =
Enabled
H/C
Stages
Locked =
Disabled
3rd stage
ON
1st stage
ON
2nd stage
ON
4th stage
ON
3rd stage
ON
1st stage
ON
2nd stage
ON
4th stage
ON
Stg4 Differential
2nd
stage
OFF
3rd stage
OFF
4th stage
OFF
5.0- PS0.1- PS5.1- PS:STNIOP SP S
P
SP -2.0
Stg1 Differential
Stg3 Differential
Stg2 Differential
SP -2.5SP -3.0SP -3.5
Stg1 Differential
Stg3 Differential
Stg2 Differential
Stg4 Differential
Heating - Heat Pump with Electric - 4 Stage (2 compressor / 2 backup)
H/C
Stages
Locked =
Disabled
abled
2nd stage
ON
1st stage
ON
2nd
stage
OFF
1st
stage
OFF
SP -1.5 SP -1.0 SP -0.5
SP
SP +0.5SP -2.0
Stg1 Differential
SP -2.5SP -3.0
Stg2 Differential
POINTS:
Heating - Dual Fuel - 2 Stage (1 compressor / 1 backup)
23
Table 5. Smart Hub Parameters
Parameter
(In alphabetical
order)
Description
H/C
Stages
Locked =
Disabled
H/C
Stages
Locked =
Enabled
POINTS:
3rd stage
ON
1st stage
ON
2nd stage
ON
3rd stage
ON
1st stage
ON
2nd stage
ON
SP -1.5 SP -1.0 SP -0.5
SP
S
P
SP -2.0
Stg1 Differential
Stg3 Differential
Stg2 Differential
SP -2.5SP -3.0SP -3.5
Stg1 Differential
Stg3 Diff.
Stg2 Differential
3rd
stage
OFF
Heating - Dual Fuel - 3 Stage (1 compressor / 2 backup)
H/C
Stages
Locked =
Disabled
H/C
Stages
Locked =
Enabled
POINTS:
3rd stage
ON
1st stage
ON
2nd stage
ON
3rd stage
ON
1st stage
ON
2nd stage
ON
2nd
stage
OFF
SP -1.5 SP -1.0 SP -0.5
SP
S
P
SP -2.0
Stg1 Differential
Stg3 Differential
Stg2 Differential
SP -2.5SP -3.0SP -3.5
Stg1 Differential
Stg3 Differential
Stg2 Differential
Heating - Dual Fuel - 3 Stages (2 compressor / 1 backup)
24
Table 5. Smart Hub Parameters
Parameter
(In alphabetical
order)
Description
Stg4 Diff.
H/C
Stages
Locked =
Enabled
H/C
Stages
Locked =
Disabled
3rd stage
ON
1st stage
ON
2nd stage
ON
4th stage
ON
3rd stage
ON
1st stage
ON
2nd stage
ON
4th stage
ON
Stg4 Differential
2nd
stage
OFF
4th
stage
OFF
5.0- PS0.1- PS5.1- PS:STNIOP SP S
P
SP -2.0
Stg1 Differential
Stg3 Differential
Stg2 Differential
SP -2.5SP -3.0SP -3.5
Stg1 Differential
Stg3 Differential
Stg2 Differential
Heating - Dual Fuel - 4 Stage (2 compressor / 2 backup)
Group ID
Multiple Smart Hubs in a home can be assigned to a group (up to nine groups with up to ve Smart Hubs in each group). All Smart
Hubs in a group can communicate with other Smart Hubs in the same group over the home Wi-Fi network.
If a Smart Hub is set to Group ID 0, there will be no connectivity with another Smart Hub.
Default Group ID is 1. Valid range is 0 to 9. (Recommend no more than 5 smart hubs per group. Doing so will eliminate possible Wi-Fi
bandwidth issues.)
HP Heating
Lockout Time
The HP could not get a zone to progress 0.5 degrees towards the set point in 120 minutes (Alert Code 40 - Minor alert). System will
switch to secondary heat source. (Electric heat or furnace in dual fuel applications). Transition back to Heat Pump normal operation
when termination setting times out.
Range is 60 to 240 minutes. Default is 60 minutes. Adjustments are in increments of 30 minutes.
HP Heating
Mode
(Allied Air Variable
capacity Heat
Pumps Only)
Options are Normal and Comfort. Default is Normal. The normal setting heats the home to the desired temperature setting. Modify the
heating comfort mode to limit minimum compressor speed to 60 – 70 percent range and/or adjust comfort mode CFM.
• Normal is when the heat pump will heat the home will providing the highest efciency.
• Comfort is when the heat pump will deliver warmer air for comfort, but sacrices on efciency.
Comfort Adjust
Options are Maximum Overcooling, Midpoint Overcooling and Minimum Overcooling. Default is Maximum Overcooling.
• Maximum Overcooling: Indoor temperature > (greater than) two degrees above heating setpoint.
• Midpoint Overcooling: Indoor temperature > (greater than) HEAT setpoint + COOL setpoint / 2.
• Minimum Overcooling: Indoor temperature > (greater than) two degrees below cooling setpoint.
Humidity Reading
Calibration
If it is determined that the actual humidity percentage being detected at the thermostat is off based on independent readings using
other humidity reading devices, the display can be adjusted using this setting.
Range is -10.0 to 10.0%. Default is 0.0%.
25
Table 5. Smart Hub Parameters
Parameter
(In alphabetical
order)
Description
Lock In 2nd
Stage HP by
Outdoor Temp
(Allied Air Two-Stage
Communicating Heat
Pumps Only)
This accessory allows the unit to lock in second stage HP heating when the outdoor temperature goes below the jumper pin setting.
Options are off, 40°F (4°C), 45°F (7°C), 50°F (10°C) and 55°F (13°C). Default is off.
Max Heat
Setpoint
The highest temperature setting that the heat set point can be set on the thermostat. Default is 90.0F (32.33°C). Range is 60.0 to
90.0°F (15.56 to 32.22°C). Adjustable in increments of 1°F (0.56°C).
Max
Humidication
Setpoint
This setting will limit the highest humidication setting on the thermostat. This parameter will only appear when a humidier accessory
is installed. Range is 15 to 45%. Default is 45%. Adjustments are in increments of 1%.
Min Cool
Setpoint
This setting will limit the lowest cooling temperature setting on the thermostat. Range is Range is 60.0 to 90.0°F (15.56 to 32.22°C).
Default is 60°F (15.56°C). Adjustments are in increments of 1°F (0.56°C).
Min
Dehumidication
Setpoint
This setting will limit the lowest dehumidication setting on the thermostat. Range is 40 to 60%. Default is 40%. Adjustments are in
increments of 1%.
Modulating
Cooling Cycles
Per Hour
(Allied Air Variable
capacity Outdoor Units
Only)
This feature is activated when the structure BTU load is less than the minimum outdoor unit cooling capacity of the outdoor unit. The
system will be cycled “ON” and “OFF” at the selected cycles per hour to maintain the settings of the thermostat. (This governs how
many cycles per hour the system will try to run when it needs to run at less than minimum capacity).
Range is 3 to 6 cycles hours. Can be adjusted in increments of 0.5. Default is 4.
Understanding Modulating Step Change and Steady State PI Gains
Each of these terms has a multiplier (or gain) associated with it called the proportional gain and the integral gain respectively and affect responsiveness and
stability
• Standard is a moderate gain suitable for nearly all installations.
• More Aggressive is a set of slightly higher gains that will make the system more responsive to changes, and will try harder to stay on the set point. This
setting may cause some systems to oscillate.
• Less Aggressive is a set of slightly lower gains that will make the system less responsive and help to stabilize an oscillating system by sacricing a small
amount of time to set point.
None of the above options will cause the system to end a call if the demand for heating or cooling remains above the minimum capacity of the system since
the algorithm is designed to nd the demand that allows the system capacity to exactly match the house heating or cooling loss, creating a balance and
constant temperature.
Modulating
Cooling Step
Change PI Gain
(Allied Air Variable
capacity Outdoor Units)
Step change gains deal with set point changes and affects how fast the system reaches the next set point.
Options are less aggressive, standard and more aggressive. Default is standard.
Modulating
Cooling Steady
State PI Gain
(Allied Air Variable
capacity Outdoor Units
Only)
Steady state gain controls the demand when the system is not responding to a sensed temperature change away from the Comfort
Sync
®
A3 thermostat setting.
Options are less aggressive, standard and more aggressive. Default is standard.
26
Table 5. Smart Hub Parameters
Parameter
(In alphabetical
order)
Description
Modulating Gas
Heating Cycles
Per Hour
This feature is activated when the structure BTU load is less than the minimum Heat Pump heating capacity of the outdoor unit. The
system will be cycled “ON” and “OFF” at the selected cycles per hour to maintain the settings of the Comfort Sync
®
A3. (This governs
how many cycles per hour the system will try to run when it needs to run at less than minimum capacity.
Range is 4 to 10 cycles. Default is 6 cycles. Adjustments are in increments of 0.5 cycles.
Modulating Gas
Heating Step
Change PI Gain
This is applicable to the A97MV only. Step change gains deal with set point changes and affects how fast the system reaches the next
set point (Example: Adjustment to the thermostat setting).
Options are less aggressive, standard and more aggressive. Default is standard. Recommend not changing this setting.
Modulating HP
Heating Cycles
Per Hour
(Allied Air Variable
capacity Heat Pumps)
This feature is activated when the structure BTU load is less than the minimum Heat Pump heating capacity of the outdoor unit. The
system will be cycled “ON” and “OFF” at the selected cycles per hour to maintain the settings of the thermostat. (This governs how
many cycles per hour the system will try to run when it needs to run at less than minimum capacity).
Range is 3 to 6 cycles. Default is four cycles. Adjustments are in increments of 0.5 cycles.
Modulating HP
Heating Step
Change PI Gain
(Allied Air Variable
capacity Heat Pumps)
Step change gains deal with set point changes and affects how fast the system reaches the next set point (Example: Schedule
change or adjustment to the thermostat setting).
Options are less aggressive, standard and more aggressive. Default is standard. Recommend not changing this setting.
Modulating HP
Heating Steady
State PI Gain
(Allied Air Variable
capacity Heat Pumps)
Steady state gain controls the demand when the system is not responding to a sensed temperature change away from the thermostat
setting.
Options are less aggressive, standard and more aggressive. Default is standard. Recommend not changing this setting.
Number of Gas
Heating Stages
Number of selectable stages when Gas Heat Control Mode is set in “Staged” mode.
Options are 1 through 4. Default is 4.
Outdoor
Temperature
Reading
Calibration
This will allow for adjustment to the outdoor temperature display when the display temperature is off. Outdoor sensor is required.
Range is -10 to 10°F (-5.56 to 5.56°C). Default is 0°F (0.0°C). Adjustments are in increments of 1°F. (0.56°C)
Reset Smart
Hub
Reset Smart Hub (erases Smart Hub settings and restarts installer setup).
Severe Weather Protection
(High and low temperature notication.)
Options are enabled or disabled. Default is disabled. When enabled either the heat or freezing alert temperature setting will automatically generate a email
notication to the homeowner that the applicable condition exist and homeowner interaction is required.
NOTE: Notication is dependent on the thermostat having an active Wi-Fi connection and the user account has been setup and includes a valid email address.
Heat Alert Temperature
This will notied the homeowner when the indoor temperature reaches the setting dened for this parameter.
Range is 80°F to 100°F (26.67 to 37.78°C) with a factory default of 90°F (32.22°C). Increments adjusted by 1.0°F (0.56°C).
Freezing Alert
Temperature
This will notied the homeowner when the indoor temperature reaches the setting dened for this parameter.
Range is 30°F to 50°F (-1.11 to 10.0°C) with a factory default of 40°F 4.4°C). Increments adjusted by 1.0°F (0.56°C).
27
Table 5. Smart Hub Parameters
Parameter
(In alphabetical
order)
Description
Single Setpoint Mode (SSP)
(Non-Zoning System Only)
On the user screens this is referred to as Perfect Temp (Temperature). Options are enabled or disabled. Default is disabled. The Single Set Point (SSP)
algorithm allows the user the set only one temperature set point value rather than one value for heating and a different value for cooling. When zoning is
present, the following SSP settings are not available. When enabled the following parameters are automatically congured for optimal settings.
SSP Heating Cancel
Coast Counter
Increment Slope
Range is 0 to 0.75°F (0.0 to 0.42°C). Default is 0.25°F (14°C). Adjustments are in increments of 0.125°F (0.07°C).
SSP Heating Cancel
Coast Counter
Decrement Slope
Range is 0.25 to 2°F (0.14 to 1.11°C). Default is 0.5°F (0.28°C). Adjustments are in increments of 0.125°F (0.07°C).
SSP Cooling Cancel
Coast Counter
Increment Slope
Range is -0.75 to 0.0°F (-0.42 to 0.0°C). Default is -0.25°F (-0.14°C). Adjustments are in increments of 0.125°F (0.07°C).
SSP Cooling Cancel
Coast Counter
Decrement Slope
Range is -2.0 to -0.25°F (-1.11 to -0.14°C). Default is -0.5°F (-0.28°C). Adjustments are in increments of 0.125°F (0.07°C).
SSP Heating Lockout
Outdoor Temp
When the outdoor temperature is above this setting, heating is not allowed if single set point is running.
Range is 50 to 80°F (10.0 to 26.67°C). Default is 70°F (21.11°C). Adjustments are in increments of 1.0°F (0.56°C).
SSP Cooling Lockout
Outdoor Temp
When the outdoor temperature is below this setting, cooling is not allowed if single set point is running.
Range is 30 to 60°F (-1.11 to 15.56°C). Default is 40°F (4.44°C). Adjustments are in increments of 1.0°F.
Smart Alert
Enable
Options are disabled, conservative, medium and aggressive. Default is disabled.
• Disable - There is no monitoring of Smart Alert Enable.
• Conservative - The system will wait longer to display any Smart Alert Enable alarms. This options allow for a minimum chance for
false alarms being shown.
• Medium (default) - Extensive testing by our development team to minimize the number of false alarms.
• Aggressive - Will shorten time to display any Smart Alert Enable alarms.
Smart Alert Enable function monitors:
• Thermostat set point setting
• Temperature reading
• Determine whether the system moving towards the desired temperature setting or is unable to achieve the desire temperature
setting.
• Uses local climate design temperatures
• System run times.
NOTE: Smart Alert Enable feature is disabled in a zoning system.
NOTE: Depending on type of system (conventional heating/cooling or heat pump system) and optional equipment not all system set-
tings will be displayed.
28
Table 5. Smart Hub Parameters
Parameter
(In alphabetical
order)
Description
Precision Setback
Recovery (PSR)
When enabled, Precision Setback begins recovery up to two hours before the programmed time so that the programmed temperature
is reached at the corresponding programmed event time. Assume 12°F (6.72°C) per hour for rst-stage gas/electric heating and
6°F (3.36°C) per hour for rst-stage compressor based heating or cooling. With Precision Setback disabled, the system will start a
recovery at the programmed time. Options are enabled or disabled. Default is enabled.
The PSR set point calculation is as follows:
Current
SSR CSP
−
Current Program CSPTarget Program CSP
−
Current
SSR HSP
Current Program HSPTarget Program HSP
−
N
−
N
For
New
SSR
HSP
For
New
SSR
CSP
Where: CSP = Cool Set Point
HSP = Heat Set Point
N = number of 30 second intervals to the target program set
point
Note: N = 240 when target program set point is 2 hours away
(maximum recovery time)
Rules for PSR:
• PSR is enabled when both “Precision Setback Recovery” is set to enabled (default) and the program schedule is turned on.
• PSR does NOT turn off stage delay timers.
• PSR will NOT change the dead band between heating and cooling modes.
• PSR will not overshoot the target set point.
• PSR will reset if the user updates the program schedule during the active SSR period
Stage Delay
Timers
(First)
Enabled (default) setting: When enabled all stage delay timers (stages 2 through 6) are enabled and will serve to bring on additional
stage(s) of cooling or heating on a timed basis (default 20 minutes)
Disabled setting: All stages delay timers are disabled. Heat/cool stages are changed based on temperature
NOTE: The second-stage delay timer (when stage timers is Enabled) is used for both HEATING and COOLING. However, if the system
has a variable capacity furnace, zoning or variable outdoor unit, all stage delay timer will be ignored.
Stage Delay
Timers
(1 through 6)
Second through Sixth Stage Delay timer (where applicable) - If staged delay timers are “Enabled”, the default is 20 minutes but can
be programmed from 5 to 120 minutes in 5-minute increments. If the rst stage fails to advance the ambient temperature toward the
set point by 1.0°F (0.56°C) in the programmed delay time, then the second stage is activated. However, if the system has a variable
capacity furnace,
Stage
Differentials
(1 through 6)
Number of stages in thermostat is dependent on equipment that is installed.
NOTE: Allied Air variable capacity systems will stage electric heat but not on differentials. It will use the thermostat PI logic to stage the
electric heat. If the system has a variable capacity furnace or zoning all stage differentials will be ignored.
Temp Reading
Calibration
Range is -5.0 to 5.0°F (-2.78 to -2.78°C). Default is 0.0°F (-0.0°C).
If it is determine that the actual temperature being detected at the thermostat is off based on independent readings using other
ambient temperature reading devices, the display can be adjusted using this setting.
29
Table 5. Smart Hub Parameters
Parameter
(In alphabetical
order)
Description
Temperature
Control Mode
The True Temp feature factors in the outdoor temperature and indoor humidity for a more accurate control of the temperature in the
home. Either an outdoor temperature sensor is used or Internet Weather is enabled for this feature to operate. Modifying this setting
here will also change the feature status on the user settings screen.
• Normal - This setting cools or heats the home to the desired temperature setting (True Temp is OFF.
• Comfort - This setting cools or heats the home to the desired temperature setting (True Temp) is ON. When set to ON, other
parameters are modied to optimal settings for this feature. Those setting changes will be listed on-screen when Comfort is enabled.
Default is Normal.
Ventilation Control Mode - timed (default)
Ventilation Minutes Per
Hour
Parameter range is 0.0 - 60.0 minutes. Default is 20.0 minutes. Can be adjusted in increments of 1.0 minutes.
• The system rst tries to satisfy the ventilation time by only ventilating while conditioning is occurring.
NOTE: Continuous fan is NOT considered conditioning.
• When the required time remaining to ventilate for the hour does not equals the amount of time remaining in that hour, the system
begins ventilation and does not stop until the ventilation time requirement is satised.
• When ventilating without a conditioning demand, the ventilation output is active as well as a continuous indoor fan demand.
• When ventilating with a conditioning demand, the ventilation output is active with the conditioning demand outputs.
Ventilation Rates
Thermostat ventilation CFM parameters are to be adjusted only after the HRV/ERV set up is completed and the CFMs are known. Once the
thermostat’s CFMs are adjusted they are used with the thermostat’s timer algorithm to determine how long to run the HRV/ERV and to change
from low to high speed if a 2-stage HRV/ERVs.
Ventilation Rate
(only listed for 1-speed
ERV or HRV)
Parameter range is 20 - 500 CFM. Default is 130 CFM. Can be adjusted in increments of 1.0 CFM.
Ventilation Rate for
Low Speed
(only listed for 2-speed
ERV or HRV
Parameter range is 10 - 200 CFM. Default is 50 CFM. Can be adjusted in increments of 1.0 CFM.
Ventilation Rate for
High Speed
(only listed for 2-speed
ERV or HRV
Parameter range is 20 - 500 CFM. Default is 130 CFM. Can be adjusted in increments of 1.0 CFM.
Ventilation High
Outdoor Temperature
Limit
Parameter range is 60 to 115ºF. Default is 100ºF. Can be adjusted in increments of 5ºF.
While the outdoor temperature is equal to or higher than the setting for Ventilation High Outdoor Temperature Limit, ventilation
does not run. When locked out due to high outdoor temperature, it will become unlocked when either the outdoor temperature is
missing, or when the temperature reported is 1°F less than the Ventilation High Outdoor Temperature Limit setting when display
units are in Fahrenheit, or is reported as 0.5°C less than lock out setting when the display units are Celsius.
Ventilation Low
Outdoor Temperature
Limit
Parameter range is -20 to 55ºF. Default is 0ºF. Can be adjusted in increments of 5ºF.
While the outdoor temperature is lower than the setting for the Ventilation Low Outdoor Temperature Limit, ventilation does not
run. When locked out due to low outdoor temperature, it will become unlocked when the outdoor temperature is missing, or when the
temperature reported is 1°F higher than the Ventilation Low Outdoor Temperature Limit setting when display units are Fahrenheit,
or is reported as 0.5°C higher than lock out setting when the display units are Celsius.
30
Table 5. Smart Hub Parameters
Parameter
(In alphabetical
order)
Description
Ventilation High
Outdoor Dew Point
Limit
Parameter range is 45 to 80ºF. Default is 55ºF. Can be adjusted in increments of 5ºF.
While the outdoor dew point is higher than the setting for the high outdoor dew point limit, ventilation does not run. When locked
out due to high outdoor dew point limit, it will become unlocked when the outdoor dew point is missing, or when the dew point
temperature reported is 1°F less than the lock out setting when display units are Fahrenheit, or is reported as 0.5°C less than lock out
setting when the display units are Celsius.
Ventilation Control Mode - ASHRAE
• In this mode the thermostat can assist the installer by validating the ventilation CFMs are capable of meeting the ASHRAE required ventilation volumes, but
the thermostat has no ability to control CFM from the HRV/ERV.
• The system rst tries to satisfy the ventilation volume by only ventilating while conditioning is occurring. Continuous fan is not considered conditioning.
• The total volume of ventilation air is accumulated and stored to compare against the target hourly ventilation volume Vhr. The accumulated value resets each
hour.
• When the remaining required volume of ventilation air for the hour divided by the fan only ventilation rate is equal to or greater than the time remaining to
ventilate for the hour and no conditioning is occurring, the system begins ventilation using continuous fan and does not stop until the target hourly ventilation
volume requirement is satised.
• When ventilating without a conditioning demand, the ventilation output is active as well a continuous indoor fan demand.
• When ventilating with a conditioning demand, the ventilation output is active with the conditioning demand outputs.
• When the system is ventilating, the user interface can indicate as such by showing “ventilating” to the user on the home screen.
Ventilation Rates
Thermostat ventilation CFM parameters are to be adjusted only after the HRV/ERV set up is completed and the CFMs are known. Once the
thermostat’s CFMs are adjusted they are used with the thermostat’s timer algorithm to determine how long to run the HRV/ERV and to change
from low to high speed if a 2-stage HRV/ERVs.
Ventilation Rate
(Only listed for 1-speed
ERV or HRV)
Parameter range is 20 - 500 CFM. Default is 130 CFM. Can be adjusted in increments of 1.0 CFM.
Ventilation Rate for
Low Speed
(Only listed for 2-speed
ERV or HRV
Parameter range is 10 - 200 CFM. Default is 50 CFM. Can be adjusted in increments of 1.0 CFM.
Ventilation Rate for
High Speed
(Only listed for 2-speed
ERV or HRV
Parameter range is 20 - 500 CFM. Default is 130 CFM. Can be adjusted in increments of 1.0 CFM.
Ventilation Outdoor
Condition Override
Options are Disabled (default) or Enabled.
ASHRAE Compliance
Check
= NO (Ventilation CFM too low to comply with ASHRAE 62.2) or = YES (Current settings comply with ASHRAE 62.2)
ASHRAE Inltration
Credit
Parameter range is 0.0 - 200.0 CFM. Default is 0 CFM. Can be adjusted in increments of 1.0 CFM.
31
Table 5. Smart Hub Parameters
Parameter
(In alphabetical
order)
Description
ASHRAE House Floor
Area Serviced by This
Ventilator
Parameter range is 500.0 - 5000.0 square feet. Default is 2500.0 CFM. Can be adjusted in increments of 100.0 square feet. The
formula for calculating how much ventilation is required is:
(Total square footage of the home/100) + ((number of bedrooms+1) x 7.5 cfm)
ASHRAE Number of
Bedrooms
Parameter range is 1.0 - 10.0. Default is 3.0. Can be adjusted in increments of 1.0.
Ventilation Outdoor Condition Override - Enabled
Ventilation High
Outdoor Temperature
Limit
Parameter range is 60 to 115ºF. Default is 100ºF. Can be adjusted in increments of 5ºF.
While the outdoor temperature is equal to or higher than the setting for Ventilation High Outdoor Temperature Limit, ventilation
does not run. When locked out due to high outdoor temperature, it will become unlocked when either the outdoor temperature is
missing, or when the temperature reported is 1°F less than the Ventilation High Outdoor Temperature Limit setting when display
units are in Fahrenheit, or is reported as 0.5°C less than lock out setting when the display units are Celsius.
Ventilation Low
Outdoor Temperature
Limit
Parameter range is -20 to 55ºF. Default is 0ºF. Can be adjusted in increments of 5ºF.
While the outdoor temperature is lower than the setting for the Ventilation Low Outdoor Temperature Limit, ventilation does not
run. When locked out due to low outdoor temperature, it will become unlocked when the outdoor temperature is missing, or when the
temperature reported is 1°F higher than the Ventilation Low Outdoor Temperature Limit setting when display units are Fahrenheit,
or is reported as 0.5°C higher than lock out setting when the display units are Celsius
Ventilation High
Outdoor Dew Point
Limit
Parameter range is 45 to 80ºF. Default is 55ºF. Can be adjusted in increments of 5ºF.
While the outdoor dew point is higher than the setting for the high outdoor dew point limit, ventilation does not run. When locked
out due to high outdoor dew point limit, it will become unlocked when the outdoor dew point is missing, or when the dew point
temperature reported is 1°F less than the lock out setting when display units are Fahrenheit, or is reported as 0.5°C less than lock out
setting when the display units are Celsius.
Wall Insulation Options are poor, average and good. Default is average.
Zone 1 through
4 First Stage
Differential
Differential is the temperature between when rst stage will cycle ON and cycle OFF. (Example: Zone 1 HD Display is set at 70°F
(21°C) with a 1.0°F (0.56°C) differential. Cooling Demand - cooling will cycle ON when the room temperature reaches 70.5°F (21.4°C)
and cycle OFF when the room temperature is 69.5°F (20.8°C).
Range is 0.5 to 3°F (0.28 to 1.67°C). Default is 1°F (0.56°C). Adjustments are in increments of 1°F (0.56°C).
NOTE: For Allied Air variable capacity Outdoor Units differentials are ignored.
Zone 1 through
4 Continuous
Blower CFM
Minimum and maximum CFM will be dependent on system component congurations. These parameter values are automatically
adjusted to the specic hardware conguration. See Comfort Sync
®
Zoning system installation instruction for minimum CFMs for
specic indoor units.
Zones requesting the fan ON are only allowed while no other zone demand is present. The thermostat will sum all the zone
continuous blower CFM requirements and send the command only after positioning the dampers and waiting for the damper close
delay period to expire (30 seconds) Continuous blower demands are the lowest priority demands, all other conditioning demands will
over-ride the continuous blower demand.
Range is 5 CFM to maximum of indoor unit. Default is dependent on tonnage of indoor unit. Adjustments are in increments of 5
CFM.
32
Table 5. Smart Hub Parameters
Parameter
(In alphabetical
order)
Description
Zone 1 through 4
Cooling CFM
Minimum and maximum CFM will be dependent on system component congurations. These parameter values are automatically
adjusted to the specic hardware conguration. See Comfort Sync
®
Zoning system installation instruction for minimum CFMs for
specic indoor units.
Target cooling CFM for a specic zone. Range is 5 CFM to maximum of indoor unit. Default is dependent on tonnage of indoor unit.
Adjustments are in increments of 5 CFM.
Zone 1 through 4
Heating CFM
Minimum and maximum CFM will be dependent on system component congurations. These parameter values are automatically
adjusted to the specic hardware conguration (See Comfort Sync
®
Zoning installation instruction for minimum CFMs for specic
indoor units).
Target heating CFM for a specic zone. Range is 5 to maximum of indoor unit. Default is dependent on tonnage of indoor unit.
Adjustments are in increments of 5 CFM. Adjustments are in increments of 5 CFM.
Zoning
Anticipated
Discharge Air
Temperature
Adjustment
This parameter setting compensates for a rapid change of the discharge air temperature due to fast changing conditions. It examines
the change in the discharge air temperature for the previous two minutes and extrapolates or looks forward by the number of seconds
set in the parameter and uses this as the DATS value for staging. This parameter setting helps prevent limit trip/frozen coil from
occurring.
Range is 0 to 120 seconds. Default is 0 seconds. Adjustments are in increments of 5 seconds.
Zoning Gas
Heating DAT Cool
Down Target
At the end of a gas cycle, the Heat Blower Off-Delay may not be long enough to completely cool the heat exchanger. This may result
in a primary limit trip then, or at the beginning of the next heat demand. This parameter allows the blower to run after a gas heat call
ends until the discharge air temperature sensor (DATS) cools to the temperature set in the parameter. If the temperature is set too low
this will cause the temperature in the room to overshoot.
Range is 80 to 90°F (26.67 - 32.22°C). Default is 90°F (32°C). Adjustments are in increments of 1°F (0.56°C).
Zoning Initial
Staging Hold
Time for Gas
Heating
In zoning systems, the furnace was upstaging before the discharge air sensor reached a steady-state value and it would sometimes
trip a limit due to staging up the gas before the blower would even come on (as occurs during pressure switch calibration).
In addition and options for delaying the rst staging event even further since the starting point of the modulation gas heat in zoning is
picked to be appropriate for the airow being provided, so this parameters allows an adjustment on top of the initial delay. Range: 3.0
– 8.0 minutes, with a default: 5.0 minutes. Can be adjusted in 1 minute increments.
Zoning Minimum
Zone Run-Time
Range is 90 to 600 seconds. Default is 120 seconds. Adjustments are in increments of 30 seconds.
Zoning Supply
Air Temp Limit
for Cooling
In cooling mode, this setting sets the discharge air temperature low limit. Below this temperature, the cooling is turned off.
Range is 35 to 45°F (1.67 - 7.22°C). Default is 40°F (4.44°C). Adjustments are in increments of 1°F (0.56°C).
Zoning Supply
Air Temp Limit
for Gas / Electric
Heating
In heating mode, this setting sets the target discharge air temperature.
Range is 120 to 160°F (48.88 to 54.44°C). Default is 125°F (52°C). Adjustments are in increments of 5°F (2.78°C).
Zoning Target
Supply Air Temp
for Cooling
In cooling mode, this setting sets the target discharge air temperature.
Range is 40 to 60°F (4.44 - 15.56°C). Default is 45°F (7.22°C). Adjustments are in increments of 1°F (0.56°C).
Zoning Target
Supply Air Temp
for HP Heating
In heat pump heating mode, this setting sets the target discharge air temperature.
Range is 85 to 110°F (29.44 to 43.33°C). Adjustments are in increments of 1°F (0.56°C). Default 90°F (32°C) plus 20 degrees
overshoot for both stage and modulating systems.
33
Table 5. Smart Hub Parameters
Parameter
(In alphabetical
order)
Description
Zoning Target
Supply Air Temp
for Gas/Electric
Heating
Default is 110°F. Range is 100°F to 130°F with 1 degree increment adjustable. In heating mode, this setting sets the target discharge
air temperature. Default 100°F (38°C) plus 20 degrees overshoot for both stage and modulating systems.
Table 6. Heat Pump Parameters
Parameter Description
About
This screen provides information concerning language supported, equipment type name, unit model number, unit serial number, unit
nominal capacity, number of heating states, number of cooling stages, heating capacity by stage, cooling capacity by stage, control
software revision, control model number, control serial number, control hardware revision, outdoor air temp sensor, protocol revision
number, device product level, 24VAC average power consumption, 24VAC peak power consumption, line voltage average power
consumption, line voltage peak power consumption, outdoor inverter model number, outdoor inverter rmware version, outdoor fan
RPM prole, unit code, compatible devices list, application code memory size and micro-controller part number.
Automatic Max
Defrost
(Single and Two-Stage
Allied Air Communicating
Heat Pump Units)
When set to ON, the system will always run at MAX DEFROST when accumulated compressor off time is longer than 30 minutes and
ambient temperature is less than 35°F (1.6°C).
When ambient sensor temperature is higher than 40°F (4.5°C) then defrost termination will be 90°F (32°C).
This option has two settings, either ON or OFF. Default is OFF.
Compressor
Shift Delay
ON / OFF
(Single and Two-Stage
Allied Air Communicating
Outdoor Units)
The options are ON or OFF. By default it is set to ON.
• Shift Delay “OFF” - Compressor will not be cycled “OFF” going in and out of defrost.
• Shift Delay “ON” - Compressor will be cycled “OFF” going in and out of defrost.
Compressor
Short Cycle
Delay
(Single and Two-Stage
Allied Air Communicating
Outdoor Units)
This feature prevents the compressor from being short cycled any time the compressor is turned “OFF”. The range is 60 - 300
seconds. Default is 300 seconds and with an incremental adjustment of 60 seconds. When the system initiates a compressor short
cycle delay, the outdoor unit control’s seven segment display will display the delay in minutes 1 to 5 minutes. The sequence is time
remaining and a dash, and will repeat that cycle (5, 4, 3, 2 and 1) until the count down is complete. If the delay timer is change to let’s
say 180 seconds, then the countdown will start at 3.
34
Table 6. Heat Pump Parameters
Parameter Description
Defrost
Termination
Temp
(Single and Two-Stage
Allied Air Communicating
Heat Pump Units)
This is the temperature that defrost mode will be terminated. In dual fuel applications (furnace and heat pump), defrost tempering is
automatically enabled and operates as follows:
• Furnace will run for 75 seconds ON then after 90 seconds OFF for two cycles.
• After the rst two cycles, the furnace will run for 60 seconds ON then cycle OFF for 90 seconds.
• This cycle will be repeated unit the room thermostat is informed by the outdoor control that defrost has terminated.
The range is 50 - 100°F (10.0 to 37.78°C). Default is 50°F (10.0°C) and with an incremental adjustment of 10°F (5.56°C).
Variable capacity - Both Furnace and Heat Pump are Modulating:
When the thermostat receives information that the heat pump has entered defrost the thermostat sends a minimum rate heating
demand to the furnace. Then the thermostat terminates the minimum rate heating demand upon defrost completion or any time the
heat pump stops. (i.e., pressure switch opens, mode switch changes, etc.)
Staged – Both Furnace and Heat Pump are Multi-Stage:
When the thermostat receives information that the heat pump has entered defrost the thermostat performs the following:
• Sends a rst stage heating demand to the furnace.
• After 75 seconds elapse from the time the rst stage demand was sent, the thermostat terminates the furnace heating demand.
• After the furnace minimum off time has elapsed (90 seconds) from the time the previous heating termination, the thermostat starts
rst stage furnace heat again by sending the rst stage heating demand. This is the new adjustable gas heat delay setting for zoning.
• After 60 seconds elapse from the previous heating demand being sent, the thermostat terminates the furnace heating demand.
• Repeat steps 3 and 4 while defrost is active, terminating any running furnace heat demand when the HP indicates that defrost is no
longer active or any time the heat pump stops. (i.e., pressure switch opens, mode switch changes, etc.)
NOTE: The on times above assume the minimum furnace ignition time of 35 seconds.
Dehum Airow
Adjustment
Adder
(Allied Air Variable
capacity Heat
Pumps Only)
Dehumidication airow = HUMID Mode CFM table value for a given thermostat demand + dehumidication adjustment adder (High
Normal Cooling Airow CFM x Dehumidication Airow Adjustment Adder in percentage.
Both these values are in the installer set up under dealer control center > equipment > heat pump. Range is 0 to 30%. Default is
28%.
Equipment
Name
A unique name can be assigned to this component. Name can be up to 29 characters. Name can consist of letters, numbers, special
characters and spaces.
High Normal
Cooling Airow
(Allied Air Variable
capacity Heat
Pumps Only)
Thermostat values shown are defaults. This value can be adjusted up or down to meet each application requirements.
The range is 450 - 2150 CFM. Default is dependent on unit capacity with an incremental adjustment of 25 CFM.
Fan Cycling
(Single and Two-Stage
Allied Air Communicating
Heat Pumps)
Options are ON or OFF. Default OFF.
High Normal HP
Heating Airow
(Allied Air Variable
capacity Heat
Pumps Only)
Thermostat values shown are defaults. This value can be adjusted up or down to meet each application requirements.
The range is 450 - 2150 CFM. Default is dependent on unit capacity with an incremental adjustment of 25 CFM.
35
Table 6. Heat Pump Parameters
Parameter Description
Low Normal
Cooling Airow
(Allied Air Variable
capacity Heat
Pumps Only)
Thermostat values shown are defaults. This value can be adjusted up or down to meet each application requirements.
The range is 450 - 2150 CFM. Default is dependent on unit capacity with an incremental adjustment of 25 CFM.
Low Normal HP
Heating Airow
(Allied Air Variable
capacity Heat
Pumps Only)
Thermostat values shown are defaults. This value can be adjusted up or down to meet each application requirements.
The range is 450 - 2150 CFM. Default is dependent on unit capacity with incremental adjustment of 25 CFM.
Max Defrost
by Weather
(Single and Two-Stage
Allied Air Communicating
Heat Pump Units)
Options are off and on. Default is off. When set to on, information from the default Internet weather source is used to determine when
Max Defrost is used.
Reset Heat
Pump
Any installer modications under the heat pump tab will be reset back to the factory defaults if the reset heat pump option is used.
Table 7. Air Conditioner Parameters
Parameter Description
About
This screen provides information concerning language supported, equipment type name, unit model number, unit serial number, unit
nominal capacity, number of cooling stages, cooling capacity by stage, control software revision, control model number, control serial
number, control hardware revision, outdoor air temp sensor, protocol revision number, device product level, 24VAC average power
consumption, 24VAC peak power consumption, line voltage average power consumption, line voltage peak power consumption,
outdoor inverter model number, outdoor inverter rmware version, outdoor fan RPM prole, unit code, compatible devices list,
application code memory size and micro-controller part number.
Compressor
Short Cycle
Delay
This feature prevents the compressor from being short cycled any time the compressor is turned “OFF”. The range is 60 - 300
seconds. Default is 300 seconds and with an incremental adjustment of 60 seconds. When the system initiates a compressor short
cycle delay, the outdoor unit control’s seven segment display will show the delay in minutes from 1 to 5 minutes. The sequence is
time (minutes) remaining and a dash, and will repeat that cycle (5, 4, 3, 2 and 1) until the count down is complete. If the delay timer is
change for example to 180 seconds, then the countdown will start at 3 (minutes).
Dehum Airow
Adjustment
Adder
Dehumidication airow = “HUMID” Mode CFM table value for a given thermostat demand + dehumidication adjustment adder (High
Normal Cooling Airow CFM x Dehumidication Airow Adjustment Adder in percentage. Both these values are in the installer set up
under System Device/Air Conditioner/High Normal Cooling Airow).
Equipment
Name
A unique name can be assigned to this component. Name can be up to 29 characters. Name can consist of letters, numbers, special
characters and spaces.
High Normal
Cooling Airow
(Allied Air Variable
capacity Air
Conditioners Only)
The range is 450 - 2150 CFM. Default is dependent on unit capacity with an incremental adjustment of 25 CFM.
Thermostat values shown are defaults. This value can be adjusted up or down to meet each application requirements.
36
Table 7. Air Conditioner Parameters
Parameter Description
Low Normal
Cooling Airow
(Allied Air Variable
capacity Air
Conditioners Only)
The range is 450 - 2150 CFM. Default is dependent on unit capacity with an incremental adjustment of 25 CFM.
Thermostat values shown are defaults. This value can be adjusted up or down to meet each application requirements.
Reset Air
Conditioner
Any installer modications under the air conditioner tab will be reset back to the factory defaults if the reset air conditioner option is
used.
Table 8. Air Handler Parameters
Parameter Description
About
Provides information concerning unit code, language support, equipment type name, unit model number, unit serial number, unit
nominal capacity, number of heating states, heating capacity by stage, indoor blower CFM range, control software revision, control
model number, control serial number, control hardware revision, discharge air temp sensor, outdoor air temp sensor, protocol revision
number, device product level, factory installed transformer, 24VAC average power consumption, 24VAC peak power consumption, line
voltage average power consumption, line voltage peak power consumption, compatible devices list, applicable code memory size, and
micro-controller part number.
Airow Prole
- Cooling
Options are:
1 - No delays.
2 - ON: No delays; OFF: 45 sec delay.
3 - ON: 82% - 7-1/2 minutes; OFF: No delays.
4 - ON: 50% - 30 seconds at 82% - 7-1/2 minutes at 100% and nish cycle 50% / 30 seconds off.
Continuous
Indoor Blower
Airow
Range of operation of the indoor blower during continuous blower operation.
The range is 450 to 2150 CFM. Default is dependent on component match-up. Incremental adjustments are made in 5 CFM.
NOTE: All Comfort Sync
®
A3 parameter default CFM values are based on Air Handler Control (AHC) DIP switch setting (non-commu-
nicating value) prior to power up. This dip switch settings are use and calculated using CFM conversion tables. They are then
rounded up to closest number on 25 CFM resolution. Any DIP switch changes made after power up are ignore.
Cooling Indoor
Blower Off
Delay
The range is 0 - 30 seconds. Default is 0 seconds with an incremental adjustment of 2 seconds.
Cooling Indoor
Blower On
Delay
The range is 0 - 10 seconds. Default is 2 seconds with an incremental adjustment of 1 second.
Electric Heating
Airow
Range of operation of the indoor blower during electric heat operation.
The range is 1560 to 2150 CFM. Default is dependent on unit capacity with an incremental adjustment of 5 CFM.
Equipment
Name
A unique name can be assigned to this component. Name can be up to 29 characters. Name can consist of letters, numbers, special
characters and spaces.
Heating Indoor
Blower Off
Delay
Heating Indoor Blower OFF Delay (Electric Heat only -Blower runs at continuous air CFM setting during delay timing period).
The range is 0 - 10 seconds. Default is 10 seconds with an incremental adjustment of 1 second.
Heating Indoor
Blower On
Delay
The range is 0 - 5 seconds. Default is 0 seconds with an incremental adjustment of 1 second.
37
Table 8. Air Handler Parameters
Parameter Description
High Cooling
Airow
Range of operation of the indoor blower during high cooling operation.
The range is 1560 to 2150 CFM. Default is based on cooling demand with an incremental adjustments of 25 CFM.
High HP
Airow
Range of operation of the indoor blower during high heat pump operation.
Information below is example only and exact air ow range is dependent on equipment tonnage. Use your example and add
adjustment increments of +/-25 CFM
Example: The range is 800 -1100 CFM. Default setting is depending on unit tonnage. Can be incrementally adjusted by 25 CFM.
HP Indoor
Blower Off
Delay
Heat Pump Indoor Blower OFF Delay (Heat Pump only - Blower runs at continuous air CFM setting during delay timing period).
The range is 0 - 60 seconds. Default is 45 seconds with an incremental adjustment of 5 seconds.
HP Indoor
Blower On
Delay
The range is 0 - 30 seconds. Default is 0 seconds with an incremental adjustment of 5 seconds.
Low Cooling
Airow
Range of operation of the indoor blower during low cooling operation.
The range is 450.0 to 2150 CFM. Default is based on cooling demand with an incremental adjustments of 25 CFM.
Low HP Airow
Range of operation of the indoor blower during low heat pump operation.
Information below is example only and exact air ow range is dependent on equipment tonnage. Use your example and add
adjustment increments of +/-25 CFM.
Example: The range is 450 - 600 CFM. Default setting is depending on unit tonnage. Can be incrementally adjusted by 25 CFM.
Reset Air
Handler
Any installer modications under the air handler tab will be reset back to the factory defaults if the reset air handler option is used.
Table 9. Furnace Parameters
Parameter Description
About
This screen provides information on unit code, language supported, equipment type name, unit model number, unit serial number, unit
nominal capacity, number of heating stages, heating capacity by stage, indoor blower CFM range, control software revision, control
model number, control serial number, control hardware revision, discharge air temp sensor, outdoor air temp sensor, protocol revision
number, device product level, factory installed transformer, 24VAC average power consumption, 24VAC peak power consumption, line
voltage average power consumption, line voltage peak power consumption, compatible devices list, application code memory size and
micro-controller part number.
Airow Prole
- Cooling
Options are:
A - ON: 50% - 30 seconds at 82% - 7-1/2 minutes at 100% and nish cycle 50% / 30 seconds off.
B - ON: 82% - 7-1/2 minutes at 100% and nish cycle off.
C - ON: 100% - No delays; OFF: 45 seconds.
D - no delays.
Continuous
Indoor Blower
Airow
The range is 450 - 2000 CFM with a default setting based on equipment type match-up. Adjustments are in increments of 5 CFM.
NOTE: All Comfort Sync
®
A3 parameter default CFM values are based on Furnace Control (IFC) DIP switch setting (non-communicating
value) prior to power up. This dip switch settings are use and calculated using CFM conversion tables. They are then rounded up
to closest number on 25 CFM resolution. Any DIP switch changes made after power up are ignore.
38
Table 9. Furnace Parameters
Parameter Description
Cooling Indoor
Blower Off
Delay
The range is 0.0 - 30.0 seconds with a default setting base on equipment type match-up. Adjustment are increments of 10 seconds.
Default is 0.0 seconds.
Cooling Indoor
Blower On
Delay
The range is 0.0 - 10.0 seconds with a default setting base on equipment type match-up. Adjustment are increments of 1 second.
Default is 2.0 seconds.
Dehumidication
Airow %
Range is 60.0 to 80.0%. Default is 70.0%
Equipment
Name
A unique name can be assigned to this component. Name can be up to 29 characters. Name can consist of letters, numbers, special
characters and spaces.
Heating Indoor
Blower Off
Delay
The range is 60 - 180 seconds with a default setting base on equipment type match-up. Adjustment are increments of 10 seconds.
Heating Airow
Control Type
Options for this setting are xed CFM or xed DAT (discharge air temperature). Default is dependent on equipment type match-up.
Fixed CFM is selected as the Heating Airow Control Type (parameter default selection), the circulator will operate at a CFM that is
linearly interpolated between Low Heating Airow and High Heating Airow based on the current IFC ring rate. For example, if the
ring rate is 60% and Low Heating Airow and High Heating Airow were set to 500 CFM and 900 CFM respectively (both parameter
values are set during the IFC commission), the circulator will run at 297 CFM (= 500+ (900-500) *(60-40)/(100-40)) – assuming 40%
minimum re rate.
Fixed Discharge Air Temperature (DAT) control when selected as Heating Airow Control Type, the IFC will vary circulator at a CFM
to maintain a set Discharge Air Temperature (DAT). For example if the ring rate is 60% and Low Heating DAT and High Heating DAT
were set to 115°F (46°C) and 130°F (54.4°C) respectively (both parameter values are set during the IFC commission), the IFC will
control the circulator to maintain a DAT at 120°F (48.9°C) (115+ (130-115) *(60-40)/(100-40)) – assuming 40% minimum re rate.
When Fix DAT is enabled, the following parameters are available:
Low Heating Discharge Temp
Range is 105 to 135°F (43.44 to 60.0°C). Adjustable in increments of 5F (2.78°C). Default is 120°F (51.67°C).
High Heating Discharge Temp
Range is 115 to 145°F (48.89 to 65.56°C). Adjustable in increments of 5F (2.78°C). Default is 130°F (57.22°C).
Heating Indoor
Blower On
Delay
The range is 15 - 45 seconds with a default setting base on equipment type match-up. Adjustment are increments of 5 seconds.
High Cooling
Airow
Range of operation of the indoor blower during high cooling operation.
The range is dependent of indoor unit model and size. Default is based on cooling demand with an Incremental adjustments of 25
CFM.
High Heating
Airow
Both range and default setting is based on equipment type match-up. Adjustments are in increments of 25 CFM. This value is
automatically adjusted by the system based on heating airow control type used.
High HP
Airow
Range is 800.0 to 1100.0 CFM. Default is 967.0 CFM.
HP Indoor
Blower Off
Delay
The range is 0.0 - 60.0 seconds with a default setting base on equipment type match-up. Adjustment are increments of 5 seconds.
Default is 45.0 seconds.
39
Table 9. Furnace Parameters
Parameter Description
HP Indoor
Blower On
Delay
The range is 0.0 - 30.0 seconds with a default setting base on equipment type match-up. Adjustment are increments of 5 seconds.
Default is 0.0 seconds.
Low Cooling
Airow
Range of operation of the indoor blower during low cooling operation.
The range is dependent of indoor unit model and size. Default is based on cooling demand with an Incremental adjustments of 25
CFM.
Low Heating
Airow
Both range and default setting is based on equipment type match-up. Adjustments are in increments of 25 CFM. This value is
automatically adjusted by the system based on heating airow control type used.
Minimum
Gas Heating
Off Time
Default is 1.5 minutes. Range is 1.5 to 10 minutes. With increments of 0.5.
This setting will help with the Alarm 250 limit tripping in zoning applications where a second zone calls immediately after the satisfying
a gas heating call and there is still residual heat in heat exchanger.
Reset Furnace Any installer modications under the furnace tab will be reset back to the factory defaults if the reset furnace option is used.
Table 10. Zoning Control Parameters
Parameter Description
About
This provides information on unit code, language supported, equipment type name, control software revision, control model number,
control serial number, control hardware revision, protocol revision number, device product level, 24VAC average power consumption,
24VAC peak power consumption, compatible devices list, application code memory size, micro-controller part number, max number of
zones, supported damper types, number of damper positions, zone temp sensor 1, zone temp sensor 2, zone temp sensor 3 and zone
temp sensor 4.
Equipment
Name
A unique name can be assigned to this component. Name can be up to 29 characters. Name can consist of letters, numbers, special
characters and spaces.
Zones 1 through
4 Temp Reading
Calibration
Allows adjustment to temperature reading displayed on zone thermostat.
Reset Zoning
Control
Any installer modications under the zoning control tab will be reset back to the factory defaults if the reset zoning control option is
used.
Table 11. Thermostat (HD Display) Parameters
Parameter Description
About
This screen provides information concerning model number, serial number, hardware revision, software revision, language support
and equipment type name.
Auto
Brightness
Options are on and off. Default is off.
Brightness
Value
The brightness range is 0 - 100. Default 80. Touch either the + or - button to increase or decrease the setting.
Display Indoor
Humidity
Options are on and off. Default is off.
Display Outdoor
Weather
Options are on and off. Default is off.
40
Table 11. Thermostat (HD Display) Parameters
Parameter Description
Outdoor
Temperature
Source
Options are off, Internet (AccuWeather) or sensor. Default is Internet (AccuWeather).
Proximity
Control
Options are ON and OFF. Default is OFF. Is used to wake-up the display from screen saver mode when motion near the HD Display is
detected.
Reset
thermostat
Resets the thermostat settings to factory default.
Screen
Locked
Options are unlocked, partially locked and locked. Default is unlocked.
Screen Saver
Options are off, weather, power save and logo. Default is off.
NOTE: When the user performs a picture upload from the settings > display > screen saver page, then on this screen it will only indicate
that logo was selected. If no picture has been uploaded, then the Allied Air logo would be displayed.
Wide Setpoint
Options are ON and OFF. Default is OFF. This allows a wider low and high temperature. Normal range is 60 to 90°F (15.6 to 32.2°C).
When this parameter is set to ON, the range is 40 to 100°F (4.4 to 37.8°C). This feature can also be set through the user interface
setting screen. From the home screen go to menu > settings > heat & cool (or it may be just heat or cool) > wider set-point
range.
Table 12. Utilities
Parameter Description
Restart Smart
Hub
Restarts the Smart Hub.
Re-congure
System
Re-congure HVAC system.
Reset HVAC
Equipment
Resets all HVAC equipment.
Factory Reset
Thermostat
Resets thermostat to factory default settings.
Factory Reset
Smart Hub
Resets Smart Hub parameters back to factory default.
41
tEStS
Verify Airow Per Zone is the rst screen to appear under this selection. If
no zoning is installed, zone airow settings will be for zone 1 only. If zoning
equipment is detected by the system then zones 1 through 4 will be listed.
These screens allow for verication and modication of CFMs for blower,
heating and cooling circulation. Touch continue to proceed to the next screen.
The next screen is titled “test mode”. Either a manual or automatic test can be
run from this screen. Select Test to Run (manual or automatic option) is the next
screen to appear. Depending on hardware present, various tests are available.
By default all items to be tested are enabled. Selecting a specic test will un-
check the item. When a specic set of tests are completed the results will be
displayed on the screen next to the tested item. Touch continue to proceed to
the next set of test items. Once all tests are completed press done to return to
the touch tests to run screen. Touch the left arrow at the top left side of screen
to return to the Dealer Control Center.
Test results will be displayed on the result screens and saved in the installation
report section as well.
DIagnoStICS
This screen allows the installer to test all major communicating components
of the system indoor unit (air handler or furnace), outdoor unit (air conditioner
or heat pump) and zoning control (if applicable). Pressing the stop diagnostics
button will pause the diagnostic function.
Touch the left arrow at the top left side of screen to return to the Dealer Control
Center.
InStallatIon rEport
The overview screen provides information on dealer and customer information.
Also included under day of install section is information on conditions at the time
of installation. Information includes date, time indoor and outdoor temperatures
and indoor humidity. Under equipment, system, indoor/outdoor and zoning
model number, serial number and rmware information is displayed.
Other menus items include system indoor and outdoor units and zoning control
parameter settings.
NOTE: Installation Report is not available until after exiting the dealer control
center following commissioning. Return to the dealer control center
from the home screen to view the installation report.
Results of both manual and automatic tests will be displayed under this section.
InFormatIon
The dealer information screen will appear. The next screen will be for dealer
information. Here either the dealer phone number can be added. Once the
system is connected to the Internet, the remaining information is automatically
populated. Not all information for this screen will be viewable. Touch and hold
and then drag up to access the remaining information on the screen.
Information Required: Dealer phone number. Information that can be manually
entered is name, email website, dealer address which includes address 1,
address 2, city state and zip/postal code. Once completed, touch the left arrow
at the top left side of screen to return to the Dealer Control Center.
Warning Screen: If the dealer phone number is not provided, a warning screen
will appear. The warning screen will provided information on the limitation
imposed on the system if this information is missing. Touch no to return to the
above screen to complete the information requested or press yes to continue.
General Information
On this screen general information needs to be veried or changed. Touch
any item to change its contents. A pop-up screen will appear that will allow the
information to be added or changed.
Information Required:
1. Select desired language (ENGLISH, FRANÇAIS or ESPAÑOL).
2. Select country / region.
3. Select time and date which includes time, date, time zone, daylight savings
time (ON/OFF)
4. Temperature unit (Fahrenheit or Celsius).
5. Once completed press continue.
Home Address
On this screen general information needs to be veried or changed. Touch any
line item to change its contents. Information to be added is address 1, address
2, state, city and zip/postal code.
Complete the requested information and press the continue button.
42
Dehumidication Settings
Go to menu > settings > humidity. Under Humidity Control, select dehumidify to enable dehumidication. By default it is disabled.
When dehumidify is enabled, the options are as follows and are dependent on equipment type and accessory installed.
DEHumIDIFICatIon SEttIng optIonS
• Normal — Recommend when the air outside is not too humid.
• Max —
» Single and Two-Stage Outdoor Units or Variable Capacity outdoor units without a Discharge Air Sensor (DAS) Installed. Recommend when outdoor
air is excessively humid. May cool your home below the set temperature.
» Recommend use of discharge air sensor (DAS) catalog number 88K38 when variable capacity outdoor units are used.
» Variable Capacity Outdoor Units with DAS installed. Recommended when outdoor air is excessively humid. Adjusts cooling based on duct sensor
data. May cool your home below the set temperature.
• Climate Sync (Auto) — Automatically adjusts fan speeds and cooling power based on local climate conditions, using Climate Sync technology. May cool your
home below the set temperature.
ovErCoolIng
Slide bar adjust with a range of 0°F to 4°F (-17.8 to -15.5°C). Only available when Max or Climate Sync is selected.
DEHumIDIFICatIon SEt poInt
Slide bar adjust with a range of 40% to 60%.
aDvanCED DEHumIDIFICatIon DESCrIptIonS
See table 1 for detail information concerning system operations when using Normal, Max or Climate Sync settings.
43
Table 13. Dehumidication Control Modes of Operations
Mode of
Operation
Option Description
Dehumidication
Only
Normal
Both Staged and Variable Capacity Outdoor Units: Dehumidies while servicing a cooling demand and will not over cool.
The overcooling slider is hidden from the user. Variable capacity units use the “comfort” table to run the system, regardless
of the presence of a discharge air temperature sensor (DATS).
Max
Staged Outdoor Unit:
If at the start or during a cooling call, the humidity is above the relative humidity set point then the unit dehumidies during
the cooling demand. If at the time the cooling call terminates, the humidity demand is not satised, overcooling will occur
up to the overcooling slider setting in an attempt to satisfy the dehumidication demand. Once the room temperature
reaches the over cooling set point. If the system still has a dehumidication demand, the system keeps using the over
cooling set point as its operating cooling set point (will not wait for the temperature to rise to the normal cooling set point to
run again) until the dehumidication demand is satised
Variable Capacity Outdoor Unit:
These units work as like staged units and if a discharge air temperature sensor (DATS) sensor is installed, the DAT PI
setting is used to control the compressor speed to maintain a cold coil for optimized dehumidication. If a DATS is not
installed, the system runs using the outdoor unit’s “comfort” tables during dehumidication.
Dehumidication
Only
Available
only with
Max and
Climate
Sync
Staged Outdoor Unit:
At the end of a cooling call, if the humidity is above the set point by a certain amount (Basic to Precision Threshold
parameter), then overcooling to the overcooling slider setting occurs to satisfy the dehumidication demand. Once the
room temperature reaches the overcooling set point, if the system still has a dehumidication demand, the system keeps
using the over cooling set point as its operating cooling set point (will not wait for the temperature to rise to the normal
cooling set point to run again) until the dehumidication demand is satised.
Variable Capacity Outdoor Unit:
If at the start or during a cooling call, the humidity level is below the relative humidity set point by more than 10%, then the
mode becomes “Dry” such that the blower CFM is increased to the “Dry” table setting.
• If a cooling call starts with the humidity level below the relative humidity setpoint, or if during a cooling call, the humidity
level is between the dehumidify off relative humidity point and the relative humidity set point -10, then standard cooling runs
to satisfy the cooling demand, without any added dehumidication.
• If at the start or during a cooling call, the humidity is above the relative humidity set point then the unit dehumidies during
the cooling demand. If at the time the cooling call terminates, the humidity is above the Basic to Precision Threshold
then overcooling will occur up to the slider setting in an attempt to satisfy the dehumidication demand. Once the room
temperature reaches the over cooling set point, if the system still has a dehumidication demand, the system keeps using
the over cooling set point as its operating cooling set point (does not wait for the temperature to rise to the normal cooling
set point to run again) until the dehumidication demand is satised.
• The Basic to Precision Threshold is a parameter with the following properties: Denition: Relative humidity amount above
the relative humidity set point where over cooling will occur to dehumidify. Default: 4, Min: 0, Max: 10, Inc: 1
• Variable capacity units use the “comfort” table to run the system, regardless of the presence of a discharge air temperature
sensor.
44
Table 13. Dehumidication Control Modes of Operations
Mode of
Operation
Option Description
Dehumidication
Only
Available
only with
Max and
Climate
Sync
overcooling
0°F
0°F
4°F
2°F
48%
dehumification set−point
60%
40%
1 Variable capacity outdoor units only.
NOTE: The above information is applicable only for non-zoning systems. There is no accessory dehumidication capability in zoning systems.
Displaying Outdoor Temperature (Sensor) and Indoor Humidity on the
Home Screen
DISplayIng tHE outDoor SEnSor tEmpEraturE on tHE HomE SCrEEn
An outdoor temperature sensor is provided in all Allied communicating outdoor
units. To display the outdoor temperature on the home screen of the HD
Display, you can enable this feature under the dealer control center. Use the
following procedure to enable the outdoor temperature sensor display
1. Touch menu and then touch settings.
2. Touch advanced settings and then touch view dealer control center.
3. Touch equipment and then touch thermostat.
4. Touch Outdoor Temperature and touch sensor.
5. Touch the back arrow (<) at the top left-hand of the screen to return to the
dealer control center.
6. Touch exit.
7. From the Home screen, touch menu and then touch settings.
8. Touch display and touch outdoor temperature.
9. Touch sensor to touch the outdoor sensor. Touch < display to return to
display screen. There under outdoor temperature it will indicate sensor.
10. Touch the home icon at the top left-hand corner of the screen to return to
the home screen.
DISplayIng tHE InDoor HumIDIty on tHE HomE SCrEEn
To enable the Indoor Humidity Display on the Home screen use the following
procedure:
1. Touch menu and then touch settings.
2. Touch advanced settings and then touch view dealer control center.
3. Touch equipment and then touch thermostat.
4. Touch Display Indoor Humidity and touch the toggle switch to turn on.
5. Touch the back arrow (<) at the top left-hand of the screen to return to the
dealer control center.
6. Touch exit to return to the home screen.
Comfort Sync
®
Zoning
The damper control module is compatible with the following Allied Air equipment:
• Allied Air communicating variable speed or variable capacity (variable
capacity) indoor and two-stage or variable capacity (modulating) outdoor
units.
• Allied Air communicating variable speed indoor unit and communicating or
non-communicating (conventional) single-stage outdoor unit (two zones
maximum supported).
• Allied Air communicating variable speed indoor unit and communicating
or non-communicating (conventional) two-stage outdoor unit (four zones
maximum supported).
• Parameter settings are listed in “Table 10. Zoning Control Parameters” on
page 39.
• Wiring connections are listed in “Figure 9. Comfort Sync
®
A3, Allied Air
Communicating Indoor and Outdoor Units, Comfort Sync
®
Zoning (Damper
Control Module) and Zone Sensors” on page 10.
45
Ventilation (ERV, HRV and Fresh Air Damper)
This equipment is designed to provide fresh air while exhausting an equal
amount of stale air.
vEntIlatIon ratES
The A3 ventilation function is only a turn on - turn off feature. All CFMs must be
adjusted from the HRV/ERV unit. The ventilation function can be controlled by
outdoor temperatures and by timers in the thermostat. The ventilation feature
can also control 1 and 2 stages of ventilation operation.
Thermostat ventilation CFM parameters are to be adjusted only after the HRV/
ERV set up is completed and the CFMs are known. Once the thermostat’s
CFMs are adjusted they are used with the thermostat’s timer algorithm to
determine how long to run the HRV/ERV and to change from low to high speed
if a 2-stage HRV/ERVs.
EnErgy rECovEry vEntIlator (Erv)
The ERV unit is equipped with an enthalpic core. This device is designed
for use in warm, humid climates with heavy air conditioning loads. The ERV
unit transfers both sensible (temperature) and latent (moisture) heat from
incoming fresh air to the stale air as it is being exhausted; thus, reducing the
air conditioning load.
HEat rECovEry vEntIlator (Hrv)
The HRV unit is equipped with an aluminum core. The device uses the stale
air that is being exhausted to condition the fresh air as it is being brought in.
HRVs can be added during the commissioning procedure (see “Commissioning”
on page 13).
• Parameter settings and descriptions are listed in “Table 5. Smart Hub
Parameters” on page 18. The table below list which parameters are
available for the Fresh Air Damper, ERV and HRV equipment.
FrESH aIr DampEr
This option is used to control a damper connecting outside air to the return
plenum of the system. When a fresh air damper style of ventilation is added to
the system, and ventilation is required, the ventilation demand is serviced by
energizing 1 relay to close or open the relay contacts connected to the fresh air
damper and commanding the blower to run at a rate of at least the continuous
fan speed.
The parameter Fresh Air Damper Ventilation CFM represents the CFM of the
air drawn through the fresh air damper while the system runs the indoor blower
at the continuous fan speed for non-zoned systems, and the lowest zone CFM
(continuous fan, heating, or cooling) for zoned applications. All calculations
used to determine the ventilation volume requirement and the amount of
ventilation air delivered use this number regardless of the actual fan speed.
Zoning Application
• When ventilation is demanded in zoned applications without conditioning
calls, the fresh air damper will open and the blower will run at the lowest set
zone CFM referred to above.
• Ventilation while a zone is being conditioned is serviced simply by opening
the fresh air damper while the zone system conditions the zone.
• The system keeps track of the amount of ventilation delivered in the same
manner as any single speed HRV or ERV.
• When the time required to satisfy the ventilation time requirement using the
fresh air damper ventilation rate is greater than or equal to the time remaining
in the ventilation time block, then ventilation is initiated and continues until
the ventilation time requirement is satised.
Operation of Fresh Air Dampers with Environmental Overrides
• When the Non-ASHRAE Compliant mode is selected (Timed), the system
rst checks for the outdoor temperature and dew point to be within the set
parameter range before allowing ventilation to occur.
• When the ventilation changes states (on/off) due to an environmental
override, it will remain in that state for a minimum of 10 minutes before again
changing states due to an environmental override.
• Operation is otherwise the same as the ASHRAE compliant method.
vEntIlatIon Control moDES
Thermostat ventilation CFM parameters are to be adjusted only after the HRV/
ERV set up is completed and the CFMs are known. Once the thermostat’s
CFMs are adjusted they are used with the thermostat’s timer algorithm to
determine how long to run the HRV/ERV and to change from low to high speed
if a 2-stage HRV/ERVs.
Table 14. Ventilation Control Modes
Ventilation Control Mode
Fresh Air
Damper
1
Speed
HRV
2
Speed
HRV
1
Speed
ERV
2
Speed
ERV
Timed
Ventilation Minutes Per Hour
(0 to 60 min., default is 20 min.)
X X X X X
Ventilation Rate
(20 to 500 cfm, default is 130 cfm)
(Shown only for single speed ERV or HRV)
X X - - - X - - -
Ventilation Rate for Low Speed
(10 to 200 cfm, default is 50 cfm)
(Shown only for two speed ERV or HRV)
- - - - - - X - - - X
Ventilation Rate for High Speed
(20 to 500 cfm, default is 130 cfm)
(Shown only for two speed ERV or HRV)
- - - - - - X - - - X
Ventilation High Outdoor Temperature Limit
(60 to 115°F, default is 100°F)
X X X X X
46
Table 14. Ventilation Control Modes
Ventilation Control Mode
Fresh Air
Damper
1
Speed
HRV
2
Speed
HRV
1
Speed
ERV
2
Speed
ERV
Ventilation Low Outdoor Temperature Limit
(–20 to 55°F, default is 0°F)
X X X X X
Ventilation High Outdoor Dew Point Limit
(45 to 80°F, default is 55°F)
X X X X X
ASHRAE (62.2)
NOTE: In this mode the thermostat can assist the installer by validating the ventilation CFMs
are capable of meeting the ASHRAE required ventilation volumes, but the thermostat
has no ability to control CFM from the HRV/ERV.
Ventilation Rate
(20 to 500 cfm, default is 130 cfm)
X X - - - X - - -
Ventilation Rate for Low Speed
(10 to 200 cfm, default is 50 cfm)
- - - - - - X - - - X
Ventilation Rate for High Speed
(20 to 500 cfm, default is 130 cfm)
- - - - - - X - - - X
ASHRAE Compliance Check NO YES YES YES YES
ASHRAE Inltration Credit
(0 to 200 cfm, default is 0 cfm)
X X X X X
ASHRAE House Floor Area Serviced by this
Ventilator
X X X X X
ASHRAE Number of Bedrooms X X X X X
Ventilation Outdoor Condition Override - Enabled
Ventilation High Outdoor Temperature Limit
(60 to 115°F, default is 100°F)
X X X X X
Ventilation Low Outdoor Temperature Limit
(–20 to 55°F, default is 0°F)
X X X X X
Ventilation High Outdoor Dew Point Limit
(45 to 80°F, default is 55°F)
X X X X X
Wi-Fi Connection
This is for connecting the thermostat to a secure home wireless network.
NOTE: A router with Bonjour capabilities is required for this function. Check
the router functions if Smart Hub do not connect. Apple Bonjour
®
is an
implementation of zero-conguration networking (Zeroconf), a group
of technologies that includes service discovery, address assignment,
and host name resolution.
NOTE: Never use a home guest account. Never use an open router connection
(non-secure). Always use a secure connection physically located in
the home where the thermostat is located.
Home Wi-Fi Access Point is Visible
1. Go to menu > settings > wi-.
2. Slide the option to ON to enable Wi-Fi.
3. Wi-Fi network will show not connected. Press on not connected to
display a list of available access points.
4. Select a network will be displayed listing all detected networks within
range. Select your home network by pressing on the network name.
NOTE: The thermostat can connect to a home wireless router that uses up to
32 characters in the access point name (visible or hidden).
5. When connecting to a secure home Wi-Fi network, a password will be
requested. Enter your home Wi-Fi network password and press join to
continue.
NOTE: If you wish to see the characters you are typing, check show password.
The thermostat will support up to a 63 character password. The
password cannot contain the % or # symbols.
Home Wi-Fi Access Point is Hidden
1. Slide the option to ON to enable Wi-Fi.
2. Wi-Fi network will show not connected. Press on not connected.
3. Select other.
4. The “enter new network information” screen will appear. Enter the name of
the hidden network.
NOTE: The thermostat can connect to a home wireless outer that uses up to
32 characters in the access point name (visible or hidden).
5. Select Security. Options are: none, WEP, WPA and WPA2. If your home
Wi-Fi connection is unsecured, then Wi-FI security must be enabled using
WEP, WPA or WPA2 via the router before proceeding. Consult your router
documentation on how to enable Wi-Fi security.
6. Once security type is selected, a password eld will appear. Enter the
password to access your home Wi-Fi network.
NOTE: If you wish to see the characters you are typing, check show password.
The thermostat will support up to a 63 character password.
7. Press join.
47
Whether connecting to a visible or hidden network, if successful, a check mark
will appear above both the router and Internet icons.
HOME WI-FI
ROUTER
INTERNET
ACCESS
SERVER
CONNECTION
THERMOSTAT
Figure 16. Connection Status
Troubleshooting Wi-Fi Connection
The following terminology is used in this troubleshooting section:
• Received Signal Strength Indication (RSSI). This indicates the signal strength
of the Wi-Fi router being received by the scanning device (i.e., smart phone).
So the higher the RSSI number (or less negative in some devices), the
stronger the signal.
• Wireless networks supported by this system are:
» 802.11b is 2.4Ghz band (max 11 Mbit/s)
» 802.11g is 2.4Ghz band (max 54 Mbit/s)
» 802.11n is 2.4Ghz band (max 130 Mbit/s)
• Internet Protocol Address (IP address). This is an address assigned by your
home router for each network device (e.g., computer, printer, thermostat).
Electromagnetic Interference Causing Poor Connectivity: Locate the
Smart Hub and router away from other devices that could possibility interfere
with wireless communications. Some examples of other devices that could
interfere are:
• Microwave ovens
• Wireless cameras
• Portable phones and bases
• Baby monitors
• Wireless speakers
• Bluetooth devices
• Garage door openers
• Neighbor’s wireless devices
To eliminate a possible source of interference, temporally disable any devices
and see if Wi-Fi performance has improved.
Received Signal Strength Indication (RSSI)
The ideal signal strength range for the thermostat is -1 to -69 RSSI. The signal
strength can be viewed from the thermostat interface.
1. Press NETWORK SETTINGS; this screen shows a graphical view of
buttons representing OPEN and SECURE wireless networks, along with
button for adding a network.
2. Select the access point that has already been established and connected.
When selecting the info icon, a screen will appear which will display an
option to forget the network and IP address assigned to the thermostat
by your router, sub-net mask, router, DNS and RSSI. If the RSSI signal
strength is anywhere between -9 to -69, then the signal strength is
sufcient. If outside this range, then either relocate the router closer to the
thermostat, add a repeater, or move the Smart Hub. Adjusting antenna on
router and/or Smart Hub may resolve the issue.
Home Network ........................
IP address 192.168.1.4...............
subnet mask 255.255.255.0............
router
DNS
04-ISSR............................
i
forget this network
Figure 17. Verifying Signal Strength
Performance Reports
Performance reports are only available through the consumer web portals at
www.ComfortSync.com.
More information concerning Performance Reports is available in the user
guide.
Comfort Sync
®
A3 Thermostat App (Homeowner)
The free Comfort Sync
®
A3 Thermostat app is available for use on iPhone
®
,
iPad
®
and Android™ devices. Control cooling/heating temperatures, fan
operation, set programs and set Away mode for multiple locations. Also controls
individual zone settings if system is equipped with the optional Comfort Sync
®
Zoning.
48
Notications
These screens provide information on active notications and previously
cleared notications. When selecting either a cleared or active notication a
brief description and alert code will be displayed. Notications are categorized
by system, indoor unit (air handler or furnace), outdoor unit (air conditioner or
heat pump), zoning control (if installed) and thermostat.
alErt CoDE typES
To expand a specication notication to access a more detail description of the
alert code, press the down arrow to expand the description.
• Service Urgent alerts are displayed on Home (user) screen under the
homeowner and installer alert buttons. Service Urgent means that a
service call is needed to get the system running.
• Service Soon / Service Urgent means that the system will likely recover
on its own and no interaction is necessary. Typically, either after a specic
timer period or a specic number of instances, some Service Soon alerts
will escalate to Service Urgent.
• Service Soon alerts are found only under the installer alert button.
• Information Only-Dealer is information only and helps Allied interpret test
results and understand complicated behaviors. Information Only alerts
are not reported to homeowner or dealer.
Communication System: When communication controls are operating in a
communication system, all jumper and link setting on controls are ignored.
Jumpers and link setting are treated as defaults and would only be active if the
system was converted to a non-communicating system.
SoFt DISablE
Soft disabling is when the Comfort Sync
®
A3 thermostat nds an unknown
control on the Comfort Sync
®
system communication bus. The thermostat
sends the unknown control a message to go into soft disable mode until the
component is properly congured or removed.
The Comfort Sync
®
A3 thermostat will not show any code for a soft disabled
control. When soft disabling occurs only the control that has been disabled will
display the blinking LED status. Refer to the device’s installation and setup
guide for further guidance.
Use the following procedure if a equipment interface module (EIM) is used and
is displaying the soft disable code.
1. Conrm proper wiring between all devices such as thermostat and Smart
Hub.
2. Cycle power.
3. Go to the menu > settings > advanced settings > view dealer control
center. Touch proceed to continue.
4. Select equipment.
5. Touch reset.
6. Touch re-congure system.
7. Select conrm to continue.
8. The thermostat will reboot and start through the system commissioning
procedure.
SErvICE notIFICatIon CoDES
The following are service notication alert codes.
Table 15. Service Alert Notication Codes
Service Alert Code Function
3000 Filter 1
3001 Filter 2
3002 Humidier pad
3003 UV Light
3004 Maintenance
4000 User Wi-Fi state change, disabled
4001 Firmware download failed
4002 Image le download failed
alErt CoDES
Initial notication of critical alerts will pop-up on the home screen and will
be listed under notication menu. Minor and moderate alerts are found
only under the notication menu. Moderate alerts are not e-mailed to
Homeowners. Dealers will get an email and code can be seen on thermostat
under the installer notication section.
Anytime the word DEVICE or DEVICE2 is used in this table, it will be
replaced on all alert code notication screens with the actual offending device
name, for example, thermostat, heat pump, etc.).
* Current Allied Air variable capacity (inverter) outdoor units.
49
Electrical Troubleshooting
ovErvIEW
The purpose of the service and application note is to address electrical
troubleshooting of various connections between Allied communicating
equipment and the applicable expected voltages. Applicable controls are
thermostats, Allied Equipment Interface Module (EIM) and Comfort Sync
®
A3
Zoning (DCM) and all Allied communicating air handler, furnaces and outdoor
units. Use these voltages to:
• Resolve double dashes on in-zone sensors.
• Determine whether the wire is bad or the device is faulty.
• Determine which wire is bad in the bundle.
• Resolve “missing outdoor unit”.
• Resolve “can’t nd Comfort Sync
®
indoor unit”.
DEFInItIonS
• Naked = control has no wires on it at all
• Loaded = voltage from c to i- / i+ when all four wires are on
• Landed = voltage from c to i- / i+ without r wired on board
• Transformer voltage is specic and best with three decimal places. For
example 28.316
» Thousandths always bounces and is okay.
» Hundredths can bounce but not wide range
» Tenths should never bounce
1. If it does almost every time it is a oat switch that is breaking r to the
thermostat
2. Complaint of system waiting
3. History of active alarm codes 105 and 120.
4. Codes not related to equipment
5. Blank screens
6. Wi-Fi will not stay connected.
tEStIng
Table 16. Various Equipment
C to i+ and i-
Terminals
Naked Loaded Landed
Gas Furnace (IFC) 2.84 2.615 1.9
Air Handlers 2.44 2.5 1.7
Table 16. Various Equipment
C to i+ and i-
Terminals
Naked Loaded Landed
Equipment Interface
Module
2.44 2.4 1.7
Outdoor Unit with
IFC
0 2.615 1.9
Outdoor Unit with
AHC
0 2.45 1.7
Table 17. DCM C to i+ and i- Terminals
DCM C to i+ and
i- Terminals
Naked Loaded Landed
DCM with IFC N/A 2.615 1.9
DCM with AHC N/A 2.45 1.7
Table 18. DCM C to D+, D- and PWR Terminals
DCM C to D+,
D- and PWR
Terminals
Naked Loaded Landed
DCM with IFC
C to d- 2.5 2.497 1.8
C to d+ 2.5 2.497 1.8
C to pwr 12.43 12.43 N/A
NOTE: IFC d-/d+ will be .1vdc lower than i-/i+
Table 19. DCM C to D+, D- and PWR Terminals
DCM C to D+,
D- and PWR
Terminals
Naked Loaded Landed
DCM with AHC
C to d- 2.4 2.4 1.7
C to d+ 2.4 2.4 1.7
C to pwr 12.43 12.43 N/A
NOTE: IFC d-/d+ will be .1vdc lower than i-/i+
Technical Support
Allied Air Residential technical support can be reached at 1-800-515-3501.
Hours for support are Monday through Friday 8am - 8pm EST.
50
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
10
Service
Urgent
Unknown Device
Detected
The thermostat when NOT in conguration mode has detected an unknown device. Typically the
thermostat will send a command to the unknown device and place the device into a soft disable state. The
soft disable control will indicate so as follows:
• On air handler, furnace and outdoor controls, the soft-disabled state is displayed by double horizontal lines
on seven-segment display.
• On the damper control module, the green LED will ash 3 seconds on and 1 second off.
• On the equipment interface module, the green LED will ash 3 seconds on and 1 second off.
• A new communicating device has been added to the system since the original conguration setup was
completed.
• Go to menu > settings > advanced settings > view dealer control center > equipment and press reset
all equipment. This will allow the system to auto-detect any Allied Air communicating devices attached.
Clear alert code by recong-
uring the system.
11
Service
Urgent
Missing Device
The thermostat cannot nd a previously installed system component.
• Check all system components (devices) connections to make sure they are Allied Air communicating
compatible.
• Cycle system power.
• If problem persists, then check all system components (devices) connections to make sure they are Allied
Air communicating compatible.
• Go to menu > settings > advanced settings > view dealer control center > equipment and press
reset all equipment. This will allow the system to auto-detect any Allied Air communicating components
attached.
Cycle system power, and
If problem persists then
clear by reconguring the
system.
12
Service
Urgent
Indoor Unit Not
Detected
Thermostat did not nd an indoor unit. Make sure there is an Allied Air communicating indoor unit on the
system.
• Check for voltage and missing component.
• Check R, i+, i- and C connections at subbase, Smart Hub and all attached communicating components.
• Ohm wires for electrical continuity.
• Cycle power to both indoor unit rst and then thermostat.
• Verify that equipment interface module (if applicable) is congured as either an air handler or furnace when
used with a non-communicating indoor unit.
• Go to menu > settings > advanced settings > view dealer control center > equipment and press
reset all equipment. This will allow the system to auto-detect any Allied Air communicating components
attached.
• Replace indoor unit control if there is no response.
Automatically clears when
the system detects that the
issue no longer exists.
13
Service
Urgent
Duplicate
Comfort Sensor
ID
Thermostat found more than one outdoor unit, or more than one indoor unit, or more than one thermostat
connected to the system. Thermostat will display the message “Too Many Devices of the Same Type”.
• Check wiring and remove duplicate equipment.
• Go to menu > settings > advanced settings > view dealer control center > equipment and press
reset all equipment. This will allow the system to auto-detect any Allied Air communicating components
attached.
Automatically clears when
the system detects that the
issue no longer exists.
51
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
14
Service
Urgent
Too Many
Devices of the
Same Type
The thermostat found more than one thermostat, indoor or outdoor unit on the system.
• Check wiring and remove duplicate equipment.
• Go to menu > settings > advanced settings > view dealer control center > equipment and press
reset all equipment. This will allow the system to auto-detect any Allied Air communicating components
attached.
Automatically clears when
the system detects that the
issue no longer exists.
15
Information
Dealer Only
Parameter
Mismatch
Detected
Incorrect parameter settings detected. Dealer would need to re-set the system and start conguration
again.
Automatically clears once
proper system conguration
is completed.
20
Service
Urgent
Protocol Upgrade
Required
The thermostat cannot work with one of the system devices because the thermostat rmware needs to be
updated rst
Update thermostat rm-
ware.
21
Service
Urgent
Incompatible
Equipment
Detected
Equipment is trying to be utilized that is not compatible with other system components, such as a sin-
gle-stage non-variable speed motor furnace with a modulating outdoor unit.
Use compatible equip-
ment.
29
Service
Urgent
Over
Temperature
Protection
The thermostat is reading an indoor temperature that is higher than 90ºF (factory default). The thermostat
will not allow any heating operation to begin until it senses an indoor temperature lower than 90ºF. Indoor
temperature rose above 90ºF during a heating or cooling demand.
• Heating operation is not allowed.
• Check to ensure that heating equipment is not stuck ON (reversing valve, etc.)
• Check the accuracy of the thermostat temperature sensor.
• Select cooling system mode to cool the indoor space below 90ºF.
Automatically clears when
the system detects that the
issue no longer exists.
30
Service
Urgent
Low Temperature
Protection
The thermostat will not allow any cooling operation to begin until it senses a temperature higher than
40ºF.
• Cooling operation is not allowed.
• Check to ensure that cooling equipment is not stuck ON.
• Check accuracy of the thermostat temperature sensor.
• Select heating system mode to heat the indoor space to above 40ºF.
Automatically clears when
the system detects that the
issue no longer exists.
31
Service
Urgent
Lost
communication
with Device
The applicable system component (indoor, equipment interface, damper control module or outdoor unit)
has not communicated with thermostat for more than three minutes.
• Check connections and voltages.
• Ohm wires for electrical continuity.
• If oat switch is installed on air handler drain pain, check condensate line to ensure it is not clogged and
tripping the oat switch connected in series with R terminal.
• Check to see if freezestat is installed.
If fault persists, then cycle
power.
Fault clears after communi-
cation is restored.
52
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
32
Information
Only-Dealer
Device Resetting
The applicable system component (device) is resetting itself. This issue may occur during a power outage
or power uctuation in the system. If persistent or if it coincides with the system operations then proceed
with the following troubleshooting steps.
• Check the power connections.
• Check the amperage draw at the transformer (possible overloaded).
• Check 24VAC voltage at the system component (device).
• If the fault persists after checking the connections, replace the applicable control.
To clear the alert code,
go to menu > settings >
advanced settings > view
dealer control center >
notications and select
the alert code and press the
clear button.
34
Service
Urgent
Must Program
Unit Capacity For
Device
The thermostat does not know the capacity (tonnage) of the indoor or outdoor unit. The applicable system
component is missing the programmed unit capacity.
• Remove power to thermostat before programming the unit control.
• Go to applicable unit control and program the unit capacity manually (see the unit installation instruction
for conguration instructions).
• Once conguration is complete then reconnect thermostat wires.
• Go to menu > settings > advanced settings > view dealer control center > equipment and press reset
HVAC equipment. This will allow the system to auto-detect any Allied Air communicating components
attached.
Automatically clears when
the system detects that the
issue no longer exists.
35
Service
Urgent
Incorrect
Operation Of
Device
• Message sent by thermostat to unit after more than 15 minutes asking for initiating heating or cooling with no response from unit.
• Message sent by thermostat to unit after more than 15 minutes asking for termination of heating or cooling with no response from unit.
Result
A communicating device in the system has been disabled due to a fault/lockout code in the unit’s control.
Another possible cause is electrical noise interference affecting the communicating system when the compressor contactor coil is
energized.
Corrective Action:
• Communicating system: Wire a transient voltage suppressor in parallel with the compressor contactor coil terminals on the outdoor unit.
• Non-communicating outdoor unit: Wire transient voltage suppressor (89W72) in parallel with compressor contactor coil or across the Y1
and C terminals on the indoor control board.
Transient Voltage Suppressor Part information: Made by Little Fuse, part number 5KP43CA bidirectional Transorb aka TVS Diode. Please
contact your FTC or inside technical support for help in acquiring the transient voltage suppressor if not available in your local electronics
store.
53
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
36
Service
Urgent
Heating when
Not Requested
The system has been heating for at least 15 minutes without a demand for heating.
• Run the system in diagnostic mode and verify that it matches actual equipment operation. Go to menu >
settings > advanced settings > dealer control center > diagnostics and press the start diagnostics
button.
• Check for other alert codes that may be preventing the system from operating as expected.
• Check all heating equipment to determine cause of heating demand.
• Recycle power.
Automatically clears when
the system detects that the
issue no longer exists.
37
Service
Urgent
Cooling when not
Requested
The system has been cooling for at least 15 minutes, without a demand for cooling.
• Run the system in diagnostic mode and verify that it matches actual equipment operation. Go to menu >
settings > advanced settings > dealer control center > diagnostics and press the start diagnostics
button.
• Check for other alert codes that may be preventing the system from operating as expected.
• Check all cooling equipment to determine cause of cooling demand.
• Recycle power.
Automatically clears when
the system detects that the
issue no longer exists.
38
Service
Urgent
Not Heating
when Requested
The system has not been able to turn on the heating for more than 45 minutes.
• The system will go off-line for 60 minutes and will attempt to restart itself.
• Run the system in diagnostic mode and verify that it matches actual equipment operation. Go to menu >
settings > advanced settings > dealer control center > diagnostics and press the start diagnostics
button
• Check for other alert codes that may be preventing the system from operating as expected.
• Check all heating equipment to determine cause.
• Recycle power.
Automatically clears when
the system detects that the
issue no longer exists.
39
Service
Urgent
No Cooling when
Requested
The system has not been able to turn on the cooling for more than 45 minutes.
• The system will go off-line for 60 minutes and will attempt to restart itself.
• Run the system in diagnostic mode and verify that it matches actual equipment operation. Go to menu >
settings > advanced settings > dealer control center > diagnostics and press the start diagnostics
button
• Check for other alert codes that may be preventing the system from operating as expected.
• Check all cooling equipment to determine cause.
• Recycle power.
This alert code will automat-
ically clear when the system
detects the issue no longer
exists.
54
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
40
Information
Only-Dealer
HP Heating
Lockout.
The heat pump could not increase the room temperature 0.5°F towards the set point in 30 minutes.
Gas Furnace Heating
In order to use the gas furnace as a primary heating source (not defrost tempering) when the outdoor temperature is between the high and
low balance points, the heat pump:
• Must be used for a minimum of 30 minutes and the temperature in the zone not increase by more than 0.5°F
• Has not gone into defrost in the 30 minute period.
The default for HP Heating Lockout Time default is 120 minutes and will lock the heat pump off when the outdoor temperature is above the
high balance point. Selectable range is 60 to 240 minutes.
• Go to menu > settings > advanced settings > dealer control center > equipment > Smart Hub and located HP Heating Lockout
Time to verify the lockout time setting.
• Check air ow to the zones or zones.
• Check discharge air temperatures.
• Check calibration of room thermostat.
Outdoor Unit and Zoning
When the heat pump could not get a zone thermostat to progress 0.5°F towards the set point in 30 minutes the system will lock out the
heat pump and switch to the secondary heat source. (Electric heat or if in dual fuel applications the furnace will be used and the system
put in heat pump heating lockout timer) default is 120 minutes. It will lock the heat pump off and the gas furnace will nish the heating
cycle
Set the low balance point and high balance point as close together as possible. (This is a 3°F difference – Example: set high balance point
at 25°F and low balance point would set at 22°F). Below the low balance point, the furnace will heat the home / between the low and high
balance point, the heat pump and furnace will heat the home. I when the outdoor temperature is above the high balance point, the gas
furnace is locked out and all the heat is provided by the heat pump.
41
Information
Only-Dealer
Device Control
Board Replaced
This alert code will appear anytime a communicating control [Furnace, air handler, damper control module,
air conditioner or heat pump] is replaced in the system.
Must be cleared manually.
55
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
105
Service
Urgent
Communication
Problem
One of the system components has lost communication with the system. The system component (device)
is unable to communicate.
• A3 - Access dealer control center, select notications icon, review alert code details to determine which
device or unit has the communication problem. Review both active and cleared alerts.
• Zoning - Remove wire from Smart Hub to Comfort Sync
®
control and just have wiring from furnace.
Troubleshooting:
• Check each control for additional codes
• In most cases issues are related to electrical noise. Verify that high voltage power is separated from the
low voltage communication wires.
• Check for proper grounding on line voltage and low voltage wiring, transformer and equipment.
• Check for incorrectly wired or loose or spliced connections between system components (devices or units).
• Make sure all unused wires are tied together and taken back to the C terminal on the indoor control board
as shown in the installation and setup guide.
• Disconnect all wiring to other system components (except thermostat to indoor unit) and reconnect one
device at a time and recommission system each time a device is reconnected until the issue is located.
• Zoning: If zoning is installed and is wired directly from Smart Hub to Comfort Sync
®
control then disconnect
that wiring. Run control wiring from the Comfort Sync
®
control directly to the indoor unit control. Wiring
diagrams are provided in the Comfort Sync
®
Zoning Installation and Setup Guide.
• Float Switch: When using a oat switch, use isolation relay to break common wire to outdoor unit. For
testing purposes, remove oat switch from the circuit.
• Firmware and Accessories: Make sure that Smart Hub has correct rmware version for added accessory.
If software is not updated in system it will cause system operation issues.
• Inductive voltage from surrounding sources. Check each wire in AC mode to C on circuit board.
> Good voltage is .03-.3VAC inductive voltage is not an issue.
> Acceptable can be up to .7VAC with moderate success.
> Some units have worked with up to 1.2VAC with occasional success.
> Voltage over 1.2VAC needs to be addressed.
Automatically clears when
the system detects the issue
no longer exists.
110
Service
Urgent
GF Low AC Line
Voltage
The component AC line voltage is too low. This alert code may appear during a brownout.
• It may also occur when line voltage is below its designed operating value.
• Check and correct the power line voltage.
Automatically clears when
the system detects the issue
no longer exists.
111
Service
Urgent
GF Line Polarity
Reversed
The unit is reporting that its power and neutral lines are reversed.
• Turn off the power to the system and correct the line power voltage wiring.
• System resumes normal operation ve seconds after critical condition is recovered.
Automatically clears when
the system detects the issue
no longer exists.
56
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
112
Service
Urgent
GF No Ground
Connection
The reporting component cannot nd earth ground. The thermostat will shut down the system.
• Provide proper earth ground to the equipment.
• System resumes normal operation ve seconds after critical condition is recovered.
Automatically clears when
the system detects the issue
no longer exists.
113
Service
Urgent
GF High AC Line
Voltage
Line voltage high (voltage higher than nameplate rating).
• Provide power voltage within proper range.
• System resumes normal operation ve seconds after critical condition is recovered.
Automatically clears when
the system detects the issue
no longer exists.
114
Service
Soon/Service
Urgent
AC Line
Frequency /
Distortion Prob
In most cases the errors will have something to do with the transformer(s) phasing, input power or output loading (amperage load).
For the air handler control only, alert code 114 is generated only if the measured line frequency is below 57Hz or above 63Hz and remains
out of range for 10 consecutive seconds. We count power line cycles and determine line frequency every 1 second of time based on the
processor’s quartz crystal oscillator. We have a fair amount of ltering on when we consider a power line cycle to have occurred, so there
would have to be really bad distortion for it to count an extra cycle or miss a real cycle.
Voltage low enough to miss a cycle would generate an alert code 115. There are lots of events, such as power utility substation switching,
that could occasionally make our power line frequency off by one count. These are rare one-time events and I don’t know anything other
than a generator with bad frequency that could cause problems long enough to cause this alert code.
There is a frequency / distortion problem with the power to a specic system component. This alert code may indicate transformer
overloading.
• Check the voltage and line power frequency.
• Check the generator operating frequency, if the system is running on back-up power.
• Correct voltage and frequency problems.
• System will resume normal operation ve seconds after fault recovered.
• All applicable system component outputs are disabled – moderate condition.
• After 10 minutes, the priority condition is escalated – critical condition.
• Damper control module will operate in central mode only until proper voltage is restored or frequency distortion is resolved – moderate
condition.
• If connected to Comfort Sync
®
Zoning, set damper control module transformer jumper to system transformer. Check for proper wiring.
Replace 40VAC furnace transformer with 70VAC transformer. Re-commission system.
NOTE: The unitary control (outdoor unit control board) whether it is a single, two-stage or multi-stage control is not displaying alert code
114.
115
Service
Soon/Service
Urgent
Low Secondary
(24VAC) Voltage
24VAC power to a system component control is lower than the required range of 18 to 30VAC.
• Check and correct voltage.
• Check for additional power-robbing system components (devices) connected to system.
• This alert code may require the installation of an additional or larger VA transformer.
• Damper control module will operate in non-zone mode until proper voltage is restored.
Automatically clears when
the system detects the issue
no longer exists.
57
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
116 Service Soon
ID High
Secondary
(24VAC) Voltage
• Thermostat will display this code when 24VAC power is high (18 to 30VAC).
• Will display Furnace or Air Handler High Secondary (24VAC) voltage.
Check and correct voltage.
Check for proper line
voltage (120VAC, 240VAC,
etc.) to equipment. Clears
when control senses proper
voltage.
117 Service Soon ID Poor Ground
The reporting unit has poor earth grounding.
• Provide proper grounding for the system component (device).
• Check for proper earth ground to the system.
• Reference Corp0123L10 for additional information
Automatically clears 30
seconds after the issue is
corrected.
120 Service Soon
Unresponsive
Device
There is a delay in the system component responding to the system. Typically this alert code does not
cause any operational issues and will clear on its own.
• This alert code is usually caused by a delay in the outdoor unit responding to the thermostat.
• Leaking voltage from strands within the bundle.
> Land only the R wire on the R terminal to load the bundle with 24VAC.
►Typically only the R wire needs to be landed to identify if voltage is leaking.
►If voltage is present checking the other wires is informational only but not needed.
►If voltage is not present checking the other wires one at a time would be needed.
> Check each loose wire in AC mode to C on circuit board.
►Good voltage is .03 -.3VAC leaking voltage is not the issue.
►Acceptable can be up to .7VAC with moderate success.
►Some units have worked with up to 1.2VAC with occasional success.
►Voltage over 1.2VAC needs to be addressed.
Automatically clears after an
unresponsive system com-
ponent (device) responds to
any inquiry.
124
Service
Urgent
Tstat Lost
Communication
To Smarthub
The thermostat has lost communication with a system component for more than three minutes. System
component has lost communication with the thermostat. See “4. Service Notication Codes” on page <?>
for assistance.
• Check the wiring connections between components.
• Ohm wires.
• Cycle power.
• Any component that is miss-wired may cause a false component code to be shown on system component.
• Disconnect all wiring to other system components and check communication one at a time.
NOTE: When using a oat switch, use isolation relay to break common wire to outdoor unit. For testing
purposes, remove oat switch from the circuit
This alert code stops all associated system operations and waits for a heartbeat message from the system
component that is not communicating.
Automatically clears after
communication is re-estab-
lished with applicable system
component (device).
58
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
125
Service
Urgent
Control Hardware
Problem
There is a hardware problem on a system component control. There is a control hardware problem.
• In system using Comfort Sync
®
zoning, the system will remain in non-zone mode (all dampers open) for
ve minutes after priority condition no longer exist.
• In systems using an Equipment Interface Module, remove jumper if present on indoor unit between R and
W2.
If none of the above tips are applicable, then replace the control if the problem prevents operation and is
persistent.
Automatically clears ve
minutes after the issue no
longer exists.
126
Service
Urgent
Control Internal
Communication
Prob
There is an internal hardware problem on the system component control. In addition, if you have zoning the
alert code is triggered when your zone temperature is deviating away from set point persistently.
• Typically the system component control will reset itself.
• Replace the system component (device) control if the problem prevents operation and is persistent.
Automatically clears 300
seconds after the issue no
longer exists.
130
Service
Urgent
Conguration
Jumper Missing
• Conguration jumper missing on equipment interface module.
• Install the missing jumper.
• Set as heat pump, furnace control or air handler control.
NOTE: This is applicable in non-communicating applications only.
Automatically clears after
the missing or incorrectly
installed jumper is installed
or corrected.
132
Service
Urgent
Device Control
Software Fault
System component control software is corrupted.
• Recycle power.
• If failure re-occurs, replace the system component control.
Manual system power reset
is required to recover from
this alert code.
180 Service Soon
Outdoor
Temperature
Sensor Problem
The thermostat has found a problem with the outdoor sensor in the outdoor unit or the optional outdoor
sensor connected to the indoor unit. In normal operation after system component control recognizes
sensors, the alert code will be sent if valid temperature reading is lost.
• Compare outdoor sensor resistance to temperature / resistance charts in unit installation instructions.
Replace sensor pack or stand alone outdoor sensor.
• At the beginning of (any) conguration, furnace, air-handler control or equipment interface module will
detect the presence of the sensor(s).
• If detected (reading in range), appropriate feature will be set as ‘installed’ and shown in the ‘About’ screen.
Automatically clears upon
conguration, or sensing
normal values.
181 Service Soon
OD Suction
Pressure
Transducer Fault
• Suction Pressure Transducer reading above 4.75V or below 0.25V for 24hrs +/- 3hrs. Run on staged
operation.
Resets after 3 consecutive
readings that are in range.
182 Service Soon
OD Suction
Temperature
Sensor Fault
• Reading below 0.25V or above 4.75V for 24hrs +/- 3hrs. System will continue to operate normally.
Resets after 3 consecutive
readings that are in range.
59
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
183 Service Soon
OD Liquid
Pressure Sensor
Fault
• Under 0.25V and above 4.75V readings for 24 hours +/-3hrs or more on the sensor will cause this error.
• Continue normal operation, see sections related to low pressure switch emulation for specic details
related to low pressure switch faults.
Resets after 3 consecutive
readings that are in range.
184 Service Soon
OD LIquid
Temperature
Sensor Fault
• Sensor shorted or open for 24 hours +/-3hrs or more.
• Continue normal operation.
Resets after 3 consecutive
readings that are in range.
200
Service
Urgent
GF Rollout Limit
Switch Open
The furnace roll out limit switch is open. Correct the cause of roll out trip.
• Reset roll out switch.
• Test the furnace operation.
• Check for blocked or obstructed vent pipe (Intake and/or Exhaust).
• Check for ame stability, if ame is unstable, look for cause.
Automatically clears after
the furnace roll out switch is
closed.
201
Service
Urgent
ID Blower Motor
Fault
Lost communication with indoor blower motor.
• Possible causes include power outage, brown-out, motor not powered, loose wiring, condensation on
system component control without cover on breaker.
• Problem may be on system component control or motor side.
Automatically clears after
communication is restored.
202
Service
Urgent
ID Blower Motor
& Unit Size
Mismatch
The unit size code for the indoor unit and the size of blower motor do not match. Incorrect appliance unit
size code selected.
• Remove the thermostat from the system while applying power and reprogramming.
• Check for proper conguring under unit size codes for furnace/air handler in conguration guide or in
installation instructions.
Automatically clears after the
correct match is detected
following a reset.
203
Service
Urgent
ID Invalid Size
Unit Code
The unit size code for the indoor unit has not been selected or set incorrectly.
• Verify that the correct unit size code is congured. Unit size codes for furnace and air handler are listed in
the system component conguration guide or installation instruction.
• Remove the thermostat from the system while applying power and set the unit size code per instructions
provided in the indoor unit installation instruction.
Automatically clears after the
correct match is detected
following a reset.
204
Service
Urgent
GF Check Gas
Valve
There is an issue with the furnace gas valve.
• Check gas valve operation and wiring.
• Check for voltage to the gas valve.
Automatically clears after the
issue is corrected.
205
Service
Urgent
GF Gas Valve
Relay Contact
Closed
The furnace gas valve relay contact is closed.
• Check wiring on control and gas valve. The relay is located on the furnace control .
• If issue continues replace furnace control.
Automatically clears after the
issue is corrected.
206 Service Soon
GF Gas Valve
2nd Stage Relay
Fault
The furnace gas valve second-stage relay is faulty.
• Furnace will operate on rst-stage for the remainder of the heating demand.
• If unable to operate second-stage, replace furnace control.
Automatically clears after the
issue is corrected.
60
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
207
Service
Urgent
GF HSI Sensed
Open
The furnace hot surface igniter is open.
• Measure the resistance of hot surface igniter.
• Replace the igniter if it is not within the specied range found in furnace installation instruction.
Automatically clears after the
issue is corrected.
223 Service Soon
GF Low Pressure
Switch Open
The furnace low pressure switch is open.
• Check pressure (inches w.c.) of the low pressure switch closing during a heat call.
• Measure operating pressure (inches w.c.).
• Inspect vent for blockages and combustion air inducer for correct operation and restriction.
• Check for blocked cold end heater box or condensate drain or drain strainers at outlet of cold end heater
box.
• Check for cracked hoses.
• Check levelness of unit.
Automatically clears after the
issue is corrected.
224
Service
Urgent
GF Low Pressure
Switch Stuck
Closed
The furnace low pressure switch is stuck closed.
• Check operation of low pressure switch to see if it is stuck closed for longer than 150 seconds during a
heat call.
• Measure operating pressure (inches w.c.).
• Inspect vent for blockage and combustion air inducer for correct operation and restriction.
• Check for moisture in pressure switch.
Other possible issues that are specic to the older Allied Air Comfort Sync
®
thermostats are as follows:
It has been determined that this alert code is generated when a subsequent heating call occurs within 30
seconds of a prior call for heat ending. If a call for heat occurs during this time period, the inducer post-
purge from the previous call may still be in process. If that condition exists, the IFC will sense the pressure
switch circuit is closed therefore activating the alert code 224 and generate an email notication. Once the
fault is cleared, typically seconds after being generated, the subsequent call for heat will be initiated and
the furnace will return to normal operation.
Allied Air has not received any complaints of no heat situations associated with this operating condition. It
has been determined that occasionally the fault clears itself and the alert code is not stored in the IFC or
Allied Air Comfort Sync
®
thermostat.
Automatically clears after the
issue is corrected.
225 Service Soon
GF High
Pressure Switch
Failed to Close
The furnace high pressure switch will not close.
• Check pressure (inches w.c.) of high pressure switch closing during a heat call.
• Measure operating pressure (inches w.c.).
• Inspect vent for blockage and combustion air inducer for correct operation and restriction.
• Check for blocked cold end heater box or condensate drain or drain strainers at outlet of the cold end heater box.
• Check cracked hoses
• Check levelness of unit.
61
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
226
Service
Urgent
GF High
Pressure Switch
Stuck Closed
The furnace high pressure switch will not open.
• Check operation of high pressure switch closing during a heat call.
• Measure operating pressure (inches w.c.).
• Inspect vent for blockage and combustion air inducer for correct operation and restriction.
• Check for moisture in pressure switch.
Automatically clears after the
issue is corrected.
227 Service Soon
GF Low Pressure
Switch Open in
Run Mode
The furnace low pressure switch is open while in run mode.
• Check pressure (inches w.c.) of low pressure switch closing during a heat call.
• Measure operating pressure (inches w.c.).
• Inspect vent for blockage and combustion air inducer for correct operation and restriction.
• Check for blocked cold end heater box or condensate drain or drain strainers at outlet of cold end heater
box.
• Check for cracked hoses.
• Check levelness of unit.
Automatically clears after the
issue is corrected.
228 Service Soon
GF Inducer
Calibration Issue
The furnace control is not able to calibrate the pressure switch. Unable to perform pressure switch
calibration.
• Inspect vent for blockage and combustion air inducer for correct operation and restriction.
• Check for blocked cold end heater box or condensate drain or drain strainers at outlet of cold end heater
box (CEHB).
• Check for cracked hoses.
• Check levelness of unit.
Automatically clears after a
successful calibration.
229
Information
Only - Dealer
Ignition on High
Fire
• Furnace control switched to high re ignition because low re pressure switch did not close in allowed time.
• *Early models only, if fan is on when call for W1 is initiated; unit will re on high re for 60 seconds before
dropping down to low re.
No action is required.
240 Service Soon
GF Low Flame
Current - Run
Mode
This could be either low ame current or a loss of ame while in run mode.
• Check micro-amperes of the ame sensor using thermostat or control board.
• Clean or replace the ame sensor.
• Measure voltage of neutral to ground to ensure good unit ground.
• Clean face of burner assembly.
• Conrm that the vent termination is properly installed and not recirculating.
• Check for loose a wiring connection at gas valve.
Automatically clears after a
proper micro-amp reading
has been sensed.
62
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
241
Service
Urgent
GF Flame Out of
Sequence-Still
Present
Flame sensed without call for gas heating. Perform the following:
• Shut off gas.
• Check for a gas valve leak.
• Check for voltage to gas valve.
Replace the gas valve if needed.
Automatically clears when
a heat call ends success-
fully.
250 Service Soon
GF Primary Limit
Switch Open
The furnace primary limit switch is open. If limit switch is not closed within three minutes, the unit will go
into a 60 minute soft lockout (Watchguard mode). Perform the following:
• Check for high gas pressure.
• Check for low supply air. Low supply air due to being plugged or restriction in system (example: dirty air
lter or blockage in duct work).
• Check for proper ring rate on furnace.
• Check for non-functioning zone dampers.
NOTE: Limit trips will place the Comfort Sync
®
zoning system into non-zone mode.
Automatically clears when
a heat call ends success-
fully.
NOTE: If this issue occurred
on an Comfort Sync
®
zoning
system, the eld will need
to manually activate the
zoning.
252 Service Soon
ID Discharge
Air Temperature
High
A discharge air-temperature is high. Perform the following:
• Check temperature rise, air ow and input rate.
• Check for dirty air lter(s).
Automatically clears when
a heat call ends success-
fully.
270
Service
Urgent
GF Flame Failed
To Ignite
The furnace is in Watchguard mode. The furnace igniter cannot turn on the ame. This is a ve strike
condition during a single demand.
• Check for proper gas ow.
• Ensure that igniter is lighting burner.
• Check ame sensor current.
• Check for dirty lters.
• Check for blocked cold end heater box or condensate drain and cracked hoses.
Automatically clears on
successful ignition.
271
Service
Urgent
GF Low Press
Switch Open
The furnace is in Watchguard mode. The furnace low pressure switch is open. This is a ve strike condition
during a single demand.
• Check pressure (inches w.c.) of low pressure switch closing during a heat call.
• Measure operating pressure (inches w.c.).
• Check for blocked cold end heater box (CEHB), or condensate drain or drain strainers at outlet of CEHB
and cracked hoses.
• Check for cracked hoses.
• Check levelness of unit.
Automatically clears on
successful ignition.
63
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
272
Service
Urgent
GF Low Press
Switch Open Run
Mode
The furnace low pressure switch is open during run mode. The system will go into Watchguard mode.
• Check operation of low pressure switch to see if it is stuck open during a heat call.
• Measure operating pressure (inches w.c.).
• Inspect vent for blockages, and combustion air inducer for correct operation and restriction.
• Check for blocked cold end heater box (CEHB), or condensate drain or drain strainers at outlet of CEHB
and cracked hoses.
• Check for cracked hoses.
• Check levelness of unit.
Automatically clears when
a heat call ends success-
fully.
273
Service
Urgent
GF Flame Fail In
Run Mode
The furnace ame is going off during a heating cycle. The system will go into Watchguard mode.
• Check micro-amperes of ame sensor using thermostat or control diagnostics.
• Clean or replace sensor.
• Measure voltage of neutral to ground to ensure good unit ground.
• Clean face of burner assembly.
Automatically clears when
a heat call ends success-
fully.
274
Service
Urgent
GF Primary Limit
Switch Open
The furnace limit switch has been open for more than three minutes. The system will go into Watchguard
mode. In Comfort Sync
®
zoning systems, the limit trips will place the system into central mode.
• Check for high gas pressure.
• Low supply air due to being plugged or restriction in system (example: dirty air lter or blockage in duct
work).
• Check for proper ring rate on furnace.
• Check for non-functioning zone dampers.
Automatically clears when
a heat call ends success-
fully.
275
Service
Urgent
GF Flame Out Of
Seq. No Flame
The furnace ame is out of sequence. The system will go into Watchguard mode.
• Shut off gas.
• Check for gas valve leak.
Automatically clears on
successful ignition.
276
Service
Urgent
GF Calibration
Failure
The furnace is not able to calibrate or the high pressure switch opened or failed to close in run mode. The
system will go into Watchguard mode.
• Measure operating pressure (inches w.c.).
• Inspect vent for blockages, and combustion air inducer for correct operation and restriction.
• Check for blocked cold end heater box (CEHB), or condensate drain or drain strainers at outlet of CEHB
and cracked hoses.
• Check for cracked hoses.
• Check levelness of unit.
Automatically clears when
the furnace calibrates itself
successfully.
290
Service
Urgent
GF Ignition
Circuit Fault
There is a problem with the furnace ignition circuit. The system will go into Watchguard mode.
Measure resistance of hot surface igniter. Replace the hot surface igniter if it is not within specications.
Automatically clears on
successful ignition.
64
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
291
Service
Urgent
GF Heat Airow
Below Min
The heating airow is below the minimum required level. The system will go into Watchguard mode.
• Check for dirty air lter(s) and other air ow restrictions.
• Check blower performance.
Automatically clears when
a heat call ends success-
fully.
292
Service
Urgent
GF Indoor Blower
Motor Start Fault
The indoor unit blower motor will not start. The system will go into Watchguard mode.
• Indoor blower motor unable to start.
• This could be due to seized bearing, stuck wheel, and obstructions.
• Replace motor, motor module or wheel if assembly does not operate or meet performance standards.
Automatically clears after the
indoor blower motor starts
successfully.
294
Service
Soon/Service
Urgent
GF Inducer Motor
Overcurrent
There is over current in the furnace inducer motor. The system will go into Watchguard mode.
• Check combustion blower bearings, wiring and amps.
• Replace furnace inducer motor if it does not operate or does not meet performance standards.
Automatically clears after
inducer motor current is
sensed to be in-range after
the ignition following either
Watchguard mode or unit
reset.
295 Service Soon
GF Indoor
Blower Over
Temperature
The indoor blower motor is overheating. Indoor blower motor over temperature (motor tripped on internal
protector).
• Check motor bearings and amps.
• Replace indoor blower motor if necessary.
• Check for high duct static.
Automatically clears after
blower demand is satis-
ed.
310 Service Soon
Discharge Air
Temp Sensor
Problem
There is a discharge air temperature sensor issue.
• Conrm there is no short or open circuits in the Allied Air Comfort Sync
®
thermostat connections to any of
the other components in the communication system.
• Compare discharge air temperature sensor (DATS) resistance to temperature / resistance charts in system
component installation instruction.
• Replace discharge air sensor if necessary.
NOTE: Issues with a DATS connected to a damper control module or equipment interface model will not
generate an alert code.
Automatically clears 30
seconds after condition is
detected as recovered or
after system restart.
311
Information
Only - Dealer
GF Heat Rate
Reduced To
Match Airow
The heat ring rate has been reduced to match available airow (cutback mode). This is a alert code.
Furnace blower in cutback mode due to restricted airow.
• Reduce ring rate every 60 seconds to match available CFM.
• Check air lter and duct system.
• To clear, replace air lter if needed or repair or add additional ducting.
Two-stage controls will reduce ring rate to rst stage.
Automatically clears when
a heating call nishes
successfully.
65
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
312
Information
Only-Dealer
Reduced/Airow-
Indoor Blower
Cutback
The indoor blower cannot provide the requested CFM due to excessive static pressure. This is a minor
alert code.
• Static pressure has exceeded the capability of the blower motor.
• Possible restricted airow - Indoor blower is running at a reduced CFM (cutback mode).
• The variable speed motor has pre-set speed and torque limiters to protect the motor from damage caused
by operating outside of design parameters (0 to 0.8” e.g. total external static pressure).
• Check air lter and duct system.
• To clear, replace air lter if needed or repair or add additional ducting.
NOTE: Blower motor cutbacks will not show alarm code. Duct static pressure reading must be taken.
Automatically clears when
a heating call nishes
successfully.
344
Service
Urgent
GF IFC Relay Y1
Stuck
Link Relay Problem. Issue could be with possible Y1 relay failure.
NOTE: Relay is located on the IFC (Integrated Furnace Control). If issue continues replace IFC.
Automatically clears ve
minutes after Y1 input
sensed OFF.
345
Service
Urgent
Relay O Failure
The O relay on the system component has failed. Either the pilot relay contacts did not close or the relay
coil did not energize.
• Possible O relay / stage 1 failure.
• Pilot relay contacts did not close or the relay coil did not energize.
• Replace system component (device) control.
If error is applicable to any Allied Air variable capacity outdoor unit, the outdoor control will need to be
replaced.
Automatically clears after
the fault recovered following
reset.
346
Service
Urgent
HP Jumper Not
Removed
The heat pump conguration link is not cut on the air handler control.
• Conguration link not cut on air handler control.
• Cut O to R.
NOTE: This is only applicable when matching non-communicating heat pump with Allied Air communicating
indoor unit.
Automatically clears when
the system detects that the
issue no longer exists.
347
Service
Urgent
ID or EIM Relay
Y1 Fault
• Allied Air Comfort Sync
®
thermostat sends a Y1 compressor demand to the indoor control requesting it to
relay the demand to the outdoor unit.
• The indoor unit communicating control will verify the presences of 24VAC between the Y1 and C on its
terminals. If it does not detects the presences 24VAC, it will trigger alert code 347.
Possible cause for alert code 347 is Y1 relay on the applicable system component has failed. Either the
furnace pilot relay contacts did not close or the relay coil did not energize.
• System operation will stop.
• Possible Y1 relay / stage 1 failure.
• Furnace pilot relay contacts did not close or the relay coil did not energize.
NOTE: There is no input back to the applicable system component control.
Automatically clears after
reset and Y1 input sensed.
66
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
348 Service Soon ID Relay Y2 Fault
Possible cause for alert code 348 is Y2 relay on the applicable system component may have failed. Allied
Air Comfort Sync
®
thermostat sends a Y2 compressor demand to the indoor control requesting it to relay
the demand to the outdoor unit. The indoor unit communicating control will verify the presences of 24VAC
between the Y1 and C on its terminals. If it does not detects the presences 24VAC, it will trigger alert code
348. Either the furnace pilot relay contacts did not close or the relay coil did not energize.
• Possible Y2 relay / stage 2 failure.
• Furnace pilot relay contacts did not close or the relay coil did not energize.
• No input back to furnace or air handler control.
Automatically clears when
the system detects that the
issue no longer exists.
349
Service
Urgent
GF IFC Error
Check Jumper O
To R
• Only applicable in non-communicating mode.
• The O to R link on the furnace has been cut and could possibly cause a brown out.
• Might also result in low voltage to which would generate alert code as well.
• Conguration link R to O needs to be restored. Will need to restore link by hard-wiring the R to O terminals
on the terminal strip.
Automatically clears when
the system detects that the
issue no longer exists.
350
Service
Urgent
AH Electric Heat
Not Congured
The air handler’s electric heat is not congured or incorrectly congured.
• Heat call with no congured or incorrectly congured electric heat.
• Check for proper conguring under Conguring Electric Heat Stages in the air handler installation
instructions.
NOTE: Smart hub MUST be removed from the system before conguring electric heat.
Automatically clears after
electrical heat detection is
successful.
351
Service
Urgent
AH Electric Heat
Stage 1 Fault
There is an issue with the air handler’s rst stage electric heat. Either the pilot relay contacts did not close
or the relay coil in the electric heat section did not energize.
Possible heat section / stage 1 failure.
NOTE: Air handler will operate on heat pump rst stage for the remainder of the heat call.
Automatically clears after
fault recovered.
352 Service Soon
AH Electric Heat
Stage 2 Fault
There is a issue with the air handler’s second stage electric heat. Either the pilot relay contacts did not
close or the relay coil in the electric heat section did not energize.
NOTE: The air-handler will operate on rst stage electric heat until the issue is resolved.
Automatically clears after
fault recovered.
353 Service Soon
AH Electric Heat
Stage 3 Fault
There is a issue with the air handler’s third stage electric heat. Either the pilot relay contacts did not close
or the relay coil in the electric heat section did not energize.
NOTE: The air-handler will operate on rst stage electric heat until the issue is resolved.
Automatically clears after
fault recovered.
354 Service Soon
Electric Heat
AH Electric Heat
Stage 4 Fault
There is a issue with the air handler’s fourth stage electric heat. Either the pilot relay contacts did not close
or the relay coil in the electric heat section did not energize.
NOTE: The air-handler will operate on rst stage electric heat until the issue is resolved.
Automatically clears after
fault recovered.
355 Service Soon
AH Electric Heat
Stage 5 Fault
There is an issue with the air handler’s fth stage electric heat. Either the pilot relay contacts did not close
or the relay coil in the electric heat section did not energize.
NOTE: The air-handler will operate on rst stage electric heat until the issue is resolved.
Automatically clears after
fault recovered.
67
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
356
Service
Urgent
AH 1st stage
Sequencer Failed
to Close
The rst stage sequencer failed to close within the specied time limit. Currently the limit is 30 seconds.
Detection of the closure is based on the presence of the feedback signal from the output of the rst stage
sequencer when it has completed the circuit.
Check sequencer; replace
sequencer if needed. Will
automatically reset when
system is restarted.
357
Service
Urgent
AH Sequencer
Stuck Closed
Air Handler electric heat remains stuck energized Timeout is 150 seconds (from pilot relay turned off to
alarm for feedback still being on).
Check sequencer; replace
sequencer if needed. Will
automatically reset when
system is restarted.
358
Service
Urgent
AH Control Error
- Check Jumper
O To R
For systems using a heat pump, jumper O to R on the indoor control has not been removed. Remove jumper.
370
Service
Urgent
GF Interlock
Switch Open
Communicating Mode:
NOTE: The on-board jumper DS-R (W914) will be cut.
In communicating mode, the DS-R terminal is used with the EL296 and SL280 furnaces and will be used to
monitor a eld-installed interlock switch such as for example a oat switch.
When operating in this capacity, the DS jumper will be monitored as follows:
• When no alert codes are present there will be 24VAC present at this terminal.
• When control see the loss of 24VAC for two minutes it will send an alert code 370 and disable heating
function.
• If currently running a demand it will de-energize all outputs (including the blower).
• In case of an existing interlock switch alert code, upon power reset, an alert code message will be sent if
voltage is not sensed on the DS terminal.
• An alert code clearing message will be sent if 24VAC is sensed on DS terminal for the minimum of 10
seconds.
• The monitoring of DS terminal will apply to both variable speed and constant torque controls.
Non-Communicating Mode:
NOTE: The on-board jumper DS-R (W914) will NOT be cut.
The furnace control has not received 24VAC power for two minutes or more on the DS terminal
• The system will not operate.
• Dealer has cut the W914 jumper (Dehum) on the Allied Air furnace control.
• The thermostat monitors the DS terminal in the furnace for power and if the link has been cut then power
will be lost to DS.
• If DS to R terminal is accidentally cut you must reconnect a jumper from the DS to R on the terminals strip.
This alert code will clear
when 24VAC is continuously
sensed on DS terminal for a
minimum of 10 seconds or
on a power reset.
371
Service
Urgent
AH Float Switch
Sensed Open
After being active for 10 minutes (600 seconds) the priority condition will change to Service Urgent.
Automatically clears after
fault recovered.
68
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
380
Service
Urgent
EIM Interlock
Relay Fault
Interlock relay failure (furnace or air handler modes only).
• Interlock relay is energized, but input is not sensed after three seconds.
• There will be no heating or cooling due to this alert code – moderate condition.
• De-energize interlock relay and energize after ve minutes if demand is still present – critical condition.
Automatically clears after
fault recovered.
381
Service
Urgent
EIM Interlock
Relay Stuck
Interlock relay stuck (furnace or air handler modes only).
• Interlock relay continuously sensed (with relay off).
• There is no heating and cooling operation – moderation condition.
• After 10 minutes if event still exist it will be escalated to priority condition service urgent.
Automatically clears 30
seconds after fault clears.
382
Service
Urgent
EIM Relay W1
Fault
Relay W1 failure (furnace or air handler modes only). W1 relay is energized but input is not sensed after
three seconds.
Automatically clears when
W1 relay input is sensed.
400 Service Soon
OD LSOM Comp.
Internal Overload
Tripped
The compressor internal overload has tripped.
• Thermostat demand Y1 is present; however compressor is not running.
• Check power to unit.
This alert code is automat-
ically cleared after current
is sensed in both RUN and
START sensors for at least
two seconds or after service
is removed, or after power
reset.
401
Information
Only-Dealer
OD Compressor
Long Run Cycle
Either the compressor ran for more than 18 hours continuously while attempting to cool the home during a
single demand or the system refrigerant pressure is low.
• Alert code will not lockout system.
• If the two-stage outdoor unit has an outdoor control with ashing LED lights then the unit will run in low
speed;
• An outdoor control with a seven-segment display, the outdoor control will display alert code 401, but
continue to run in high speed.
• If the outdoor unit is a heat pump, and the outdoor temperature is less than 65°F, alert code 401 is ignored.
• Also monitors low pressure switch trips.
Automatically clears after
30 consecutive normal run
cycles or power reset.
402 Service Soon
OD System
Pressure Trip
• Either the discharge or suction pressure level is out-of-limits, or the compressor has overloaded.
• Check discharge or suction pressure.
Automatically clears after
four consecutive normal
compressor run cycles.
403 Service Soon
OD Compressor
Short-Cycling
The compressor ran for less than three minutes to satisfy a thermostat demand.
Automatically clears after
four consecutive normal
compressor run cycles.
69
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
404
Service
Urgent
OD Compressor
Rotor Locked
The compressor rotor is locked up due to either:
• Run capacitor short.
• Bearings are seized.
• Excessive liquid refrigerant.
NOTE: May need to install hard start kit.
Automatically clears after
four consecutive normal
run cycles or after power
reset.
405
Service
Urgent
OD Compressor
Open Circuit
The compressor circuit is open due to:
• Power disconnection -
• Open fuse
Automatically clears after
one normal compressor run
cycle.
406
Service
Urgent
OD Compressor
Open Start
Circuit
The required amount of current is not passing through the START current transformer.
Automatically clears after
current is sensed in START
sensor, or after power
reset.
407
Service
Urgent
OD Compressor
Open Run Circuit
The required amount of current is not passing through RUN current transformer.
Automatically clears after
current is sensed in RUN
sensor, one normal compres-
sor run cycle, or after power
reset.
408
Service
Urgent
OD Compressor
Contactor
Welded
The compressor is running continuously.
Automatically clears one
normal compressor run cycle
or after power reset.
409 Service Soon
OD Control
Board Low
24VAC
The secondary voltage for the applicable system component has fallen below 18VAC. This may be due
to:
• Secondary voltage is below 18VAC.
• If this continues for 10 minutes, the thermostat will turn off the applicable system component.
Automatically clears after
voltage is detected as higher
than 20VAC for two seconds
or after power reset.
410
Information
Only-Dealer
OD Open Low
Pressure Switch
Unit low pressure is below the required limit.
• Check operating pressures.
• Low pressure switch opens at a specic pressure (system shuts down) and closes at a specic pressure
(system restarts).
Automatically clears when
the system detects that the
issue no longer exists.
411
Service
Urgent
OD Low Pressure
Switch Strikes
Lockout
The low pressure switch has opened ve times during one cooling or heating demand.
• Thermostat will shut down the outdoor unit.
• Open low pressure switch error count reached ve strikes.
• Check system charge using both approach and sub-cooling methods.
• Reset by putting outdoor unit control in test mode or resetting low voltage power.
Automatically clears when
the system detects that the
issue no longer exists.
70
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
412
Information
Only-Dealer
OD Open High
Pressure Switch
The unit high pressure is above the upper limit.
• System will shut down.
• Conrm that the system is properly charged with refrigerant.
• Check condenser fan motor, expansion valve (if installed), indoor unit blower motor, stuck reversing valve
or clogged refrigerant lter.
• Conrm that the outdoor unit is clean.
Automatically clears after the
high pressure switch closes
or a power reset.
413
Service
Urgent
OD High
Pressure Switch
Strikes Lockout
The high pressure switch has opened ve times during one cooling demand.
• Thermostat will shut down the outdoor unit.
• Open high pressure switch error count reached ve strikes.
• Check system charge using superheat and sub-cooling temperatures.
• Check outdoor fan operation.
• Check for dirt or debris blocking air ow to outdoor unit.
• Reset by putting outdoor unit control in test mode or resetting low voltage power.
Automatically clears when
the system detects that the
issue no longer exists.
414 Service Soon
OD High
Discharge Line
Temperature
The discharge line temperature is higher than the recommended upper limit of 279ºF.
• Discharge line temperature is greater than 279ºF.
• Make sure coil is clean and airow unobstructed in and out of condenser.
• Check system operating pressures and compare to unit charging charts in installation manual.
Automatically clears after
discharge temperature is less
than 225ºF.
415
Service
Urgent
OD High
Discharge Line
Temp Strikes
Lockout
The discharge line temperature has been consistently higher than the recommended upper limit of
279ºF.
• Discharge line high temperature error count reached ve strikes during a single demand.
• Make sure coil is clean and airow unobstructed in and out of condenser.
• Check system charge using superheat and sub cooling temperatures.
• Reset by putting outdoor control in test mode or resetting low voltage power.
Correct issue and cycle
power to the system.
416 Service Soon
OD Coil Sensor
Faulty
The outdoor coil sensor is either open, short-circuited or the temperature is out of sensor range.
• Outdoor unit control will not perform demand or time / temperature defrost operation. (System will still heat
or cool.)
• This fault is detected by allowing the unit to run for 90 seconds before checking sensor resistance. If the
sensor resistance is not within range after 90 seconds, the control will display a moderate code.
• Advances from moderate to critical after ten (10) minutes.
• Plug-in sensor harness correctly.
• Check resistance of sensor to determine if it is open, shorted, out of temperature calibration or out of
ambient temperature range. Replace if out-of-specications.
Automatically clears when
outdoor unit control detects
proper sensor readings.
If sensor is faulty and the
system is reporting the
condition as critical, replaced
sensor. Reset power to clear
alert code.
71
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
417
Service Soon
/ Service
Urgent
OD Discharge
Sensor Faulty
System Detection and Operation:
The outdoor unit discharge line temperature sensor is either open, short-circuited or the temperature is
out of sensor range.
• This fault is detected by allowing the unit to run for 90 seconds before checking discharge line sensor
resistance.
• If the discharge sensor resistance is not within range after 90 second period, the control will display the
priority condition as service soon.
• If the moderate condition continues for 10 minutes, the system changes the priority condition to service
urgent.
Possible Causes:
• The applicable system component detects either an open, shorted or temperature out of range condition.
• Discharge sensor leads located in wrong pin positions in harness plug-in connector. Refer to the applicable
unit installation and service procedure and locate the terminal descriptions table to verify cable harness
assembly wiring pin positions are correct.
Possible Solutions:
• Check the resistance of the discharge sensor and compare to temperature resistance chart located in the
applicable unit installation and service procedure. If sensor resistance is out of range then replace the
discharge line temperature sensor.
• If discharge sensor wring leads are located in the wrong connector pin-out then order a replacement cable
assembly.
Moderate - Automatically
clears after fault signal condi-
tion is no longer present.
Critical - Power down the
system component and ei-
ther replace faulty sensor or
cable assembly (whichever is
applicable). Power up system
component after replacing
the applicable part which will
clear the alert code / priority
condition.
418 Service Soon
OD EIM W
Output Hardware
Fault
There is a faulty W output circuit.
• W terminal is energized while in cooling mode.
• Possible cause may be a stuck closed relay on the control, or something external to the control that is
energizing W terminal when it should not be energized.
• Disconnect any wiring from the W terminal.
• If 24VAC is still present on the terminal, then it is a stuck relay.
• If 24VAC disappears, then there is a need to check any of the wires hooked up to the W terminal.
Automatically clears after
fault signal is removed.
419
Service
Urgent
OD EIM W
Output Hardware
Fault Lockout
The W output has reported more than ve errors.
• The system will shut down the outdoor unit.
• The W output (alert code 418) on the outdoor unit has reported more than ve strikes.
• Disconnect thermostat wire from W and verify there is no 24VAC on the W.
• If 24VAC is present, replace the outdoor control.
Automatically clears after
power recycled.
72
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
420 Service Soon
AH EIM Defrost
Out Of Cycle
The heat pump defrost cycle has taken more than 20 minutes to complete.
• Defrost cycle lasts longer than 20 minutes.
• Check heat pump operation.
• This is applicable only in communicating indoor unit with non-communicating heat pump.
Automatically clears when
W1 signal is removed.
421
Service
Urgent
OD EIM W
External Miswire
Fault
The W output terminal on the outdoor unit is not wired correctly. Voltage sensed on W output terminal when
Y1 out is deactivated.
Automatically clears once
voltage is not sensed on
output or power is cycled.
422 Service Soon
OD Compressor
Top Cap Switch
Open
Compressor top cap switch exceeding thermal limit.
• Check condenser fan motor, TXV and indoor unit blower motor.
• Check for stuck reversing valve or clogged refrigerant lter.
• Check to ensure that one of the wires from the top cap switch has not been disconnected from one of the
TP terminals on the outdoor control. Reconnect wire if disconnected.
• Check superheat and sub-cooling.
Automatically clears when
error is corrected.
423 40
Service
Soon/Service
Urgent
OD Inverter CT
Circuit Fault
The inverter has detected a circuit issue.
• When this condition is detected the outdoor control will stop outdoor unit operations and start the anti-short
cycle timer – moderate condition.
• Outdoor control will lockout unit after 10 strikes within an hour – critical condition.
• Inverter LEDs will ash code 40
• Refer to the unit service documentation for troubleshooting procedures.
Inverter ash code 40:
The sequence is:
Red LED: Four Flashes
Green LED: Off
NOTE: Inverter normal operations with no error code present is as follows. Red LED is ON and Green LED
is OFF.
A moderate alert code will
clear automatically when
the inverter detects the
condition no longer exist and
will send a clear alert code
message.
To clear critical alert code
disconnect power to outdoor
unit and restart.
73
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
424 Service Soon
OD Liquid Line
Sensor Faulty
The liquid line temperature sensor has malfunctioned.
• In normal operation after outdoor control recognizes sensors, the alert code will be sent if a valid
temperature reading is lost.
• Compare liquid line sensor resistance to temperature / resistance charts in unit installation instructions.
• Replace sensor pack if necessary.
• At the beginning of (any) conguration, furnace or air handler control will detect the presence of the
sensor(s).
• If detected (reading in range), appropriate feature will be set as ‘installed’ and shown in the thermostat
‘About’ screen.
Automatically clears upon
conguration, or sensing
normal values.
426
Service
Urgent
OD Excessive
Inverter Alarms
After 10 faults within 60 consecutive minutes, the control will lockout. Inverter will ash codes 12 to 14 and
53.
NOTE: These inverter codes do not count towards this lockout condition.
To clear disconnect
power to outdoor control and
restart.
427 21
Service
Soon/Service
Urgent
OD Inverter DC
Peak Fault
The inverter has detected a DC peak fault condition.
• If condition (55A or higher) is detected, outdoor unit will stop (compressor and fan) – moderate condition.
• Anti-short cycle is initiated.
• If peak current (55A or higher) occurs 10 times within an hour, system will lockout – critical condition.
• Inverter LEDs will ash code 21.
• If the unit is a variable capacity heat pump, this error may occur entering or exiting a defrost cycle as the
compressor restarts after the 30 second compressor shift delay. If the unit was manufactured prior to serial
number 5817F and has frequent alert code 427, then compare the inverter part number to the latest part
number listed in the unit repair parts. Units produced after serial number 5817F which is listed on the unit
name plate have an inverter with updated software that includes compressor current slope logic to reduce
the potential of alert code 427 instances from occurring during defrost. Replace the inverter with the latest
inverter if necessary.
• Refer to the unit service documentation for detailed troubleshooting procedures.
NOTE: Serial number format on unit name plate is PPYYMNNNNN (PP = Manufacturing Plant, YY and M
represents the year and month made.
Inverter ash code 21.
The sequence is:
• Red LED: Two Flashes
• Green LED: One Flash
NOTE: Inverter normal operations with no error code present is as follows. Red LED is ON and Green LED
is OFF.
To clear, disconnect and
reconnect power to outdoor
control.
74
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
428 22
Service
Soon/Service
Urgent
OD Inverter
High Main Input
Current
The inverter has detected a high main input current condition.
• If condition is detected, outdoor unit will stop (compressor and fan) – moderate condition.
• Anti-short cycle is initiated.
• If condition occurs 10 times within an hour, system will lockout – critical condition.
• Inverter LEDs will ash code 22.
• Refer to the unit service documentation for detailed troubleshooting procedures.
Inverter ash code 22.
The sequence is:
• Red LED: Two Flashes
• Green LED: Two Flashes
NOTE: Inverter normal operations with no error code present is as follows. Red LED is ON and Green LED
is OFF.
To clear, disconnect power to
outdoor unit and restart.
75
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
429 23
Service
Soon/Service
Urgent
OD Inverter DC
Link Low Voltage
The inverter has detected a DC link low voltage condition.
• On a call for compressor operation, if DC link power in inverter does not rise above 180 VDC for 2- and
3-ton models, 250 VDC for 4- and 5-ton models within 30 seconds, the control will display a moderate
code.
• If condition is detected, outdoor unit will stop (compressor and fan) – moderate condition.
• An anti-short cycle timer is initiated. If condition occurs 10 times within a 60 consecutive minutes, system
will lock out and display alert code 429 – critical condition.
• The outdoor control anti-short cycle timer will time out and the unit will recycle the demand.
• Inverter LEDs will ash code 23.
• Refer to the unit service documentation for detailed troubleshooting procedures. Perform test function and
verify inverter DC link and line input voltage and current. Also check input to lter board and reactor before
replacing inverter board. To perform this test, go to menu > settings > advanced settings > view dealer
control center > tests.
Inverter ash code 23.
The sequence is:
• Red LED: Two Flashes
• Green LED: Three Flashes
NOTE: Inverter normal operations with no error code present is as follows. Red LED is ON and Green LED
is OFF.
Troubleshooting Suggestions:
• Check wire connections (U, V and W) at inverter plug in harness and compressor.
• Check the resistance of compressor windings. If not in range, replace compressor.
• Check compressor to ground. If ground issue, replace compressor.
• Check input power (Single Phase - 208/230VAC + 10%. If out of range, correct main power issue.
• Check DC Link voltage and MICOM Sensing voltage. If out of range, replace inverter. if okay, possible
mechanical issue with compressor.
Go to outdoor unit service manual for detail troubleshooting procedures and require values for testing DC
link voltages and various insulation resistance characteristics.
Automatically clears when
the system detects that the
issue no longer exists.
76
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
430 26
Service
Soon/Service
Urgent
OD Inverter
Compressor
Startup Fail
Compressor start-up failure.
• If condition is detected, outdoor unit will stop (compressor and fan) – moderate condition.
• Anti-short cycle is initiated.
• If condition occurs 10 times within 60 consecutive minutes, the system will lockout – critical condition.
• Inverter LEDs will ash code 26.
• Refer to the unit service documentation for detailed troubleshooting procedures.
Inverter ash code 26.
The sequence is:
• Red LED: Two Flashes
• Green LED: Six Flashes
NOTE: Inverter normal operations with no error code present is as follows. Red LED is ON and Green LED
is OFF.
• Check refrigerant
• Replace outdoor control board
• Replace inverter.
To clear, disconnect power to
outdoor unit and restart.
431 27
Service
Soon/Service
Urgent
OD Inverter PFC
Fault
The inverter has detected a PFC circuit over-current condition.
• Error occurs when PFC detects an over current condition of 100A peak.
• If condition is detected, outdoor unit will stop (compressor and fan) – moderate condition.
• Anti-short cycle timer is initiated.
• If condition occurs 10 times within 60 consecutive minutes, the system will lockout – critical condition.
• Inverter LEDs will ash code 27.
• Refer to the unit service documentation for detailed troubleshooting procedures.
Inverter ash code 27.
The sequence is:
• Red LED: Two Flashes
• Green LED: Seven Flashes
NOTE: Inverter normal operations with no error code present is as follows. Red LED is ON and Green LED
is OFF.
To clear, disconnect power to
outdoor unit and restart.
77
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
432 28
Service
Soon/Service
Urgent
OD Inverter DC
Link High Voltage
The inverter has detected a DC link high voltage condition.
• Error occurs when the DC link capacitor voltage is greater than 480 VDC.
• If condition is detected, outdoor unit will stop (compressor and fan) – moderate condition.
• Anti-short cycle timer is initiated.
• If condition occurs 10 times within 60 consecutive minutes, the system will lockout – critical condition.
• Inverter LEDs will ash code 28.
• Refer to the unit service documentation for detailed troubleshooting procedures.
Inverter ash code 28.,
The sequence is:
• Red LED: Two Flashes
• Green LED: Eight Flashes
NOTE: Inverter normal operations with no error code present is as follows. Red LED is ON and Green LED
is OFF.
Troubleshooting Suggestions:
• Check wire connections (U, V and W) at inverter plug in harness and compressor.
• Check the resistance of compressor windings. If not in range, replace compressor.
• Check compressor to ground. If ground issue, replace compressor.
• Check input power (Single Phase - 208/230VAC + 10%. If out of range, correct main power issue.
• Check DC Link voltage and MICOM Sensing voltage. If out of range, replace inverter. if okay, possible
mechanical issue with compressor.
Go to outdoor unit service manual for detail troubleshooting procedures and require values for testing DC
link voltages and various insulation resistance characteristics.
To clear, disconnect power to
outdoor unit and restart.
78
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
433 29
Service
Soon/Service
Urgent
OD Inverter
Compressor
Over-current
Compressor phase current is too high.
• During initial startup, a six minute time delay is implement to prevent the alarm from occurring.
• Error occurs when compressor peak phase current is greater than 28 amps.
• Inverter will issue inverter code 14 rst and slow down to try to reduce the current.
• If the current remains high, outdoor unit will stop (compressor and fan) – moderate condition.
• Cycle timer is initiated.
• If condition occurs ve times within 60 consecutive minutes, the system will lockout – critical condition.
• This alert code may be triggered by the inverter or the Allied Air variable capacity outdoor (inverter
controlled) unit.
• Allied Air outdoor control may trigger an this alert code if the inverter reduces the compressor speed which
is identied as a alert code 441 and the compressor speed (in hz) is below the minimum speed. This will
typically occur at start-up. The inverter automatically increases the compressor minimum speed below
45ºF in the heating mode and above 115ºF ensure the compressor capacity is sufcient for oil return. If
alert code 433 occurs and inverter does not indicate an inverter code 29, the Allied Air communicating
Allied Air outdoor control triggered the alert code 433.
> Check the Allied Air outdoor control software version by accessing the outdoor unit diagnostics section
of the Comfort Sync
®
thermostat. The Allied Air outdoor control with software versions 1.27 and later
have updated software that includes a six minute time delay during the cooling mode and a 11 minute
delay during the heating mode after receiving an alert code 433, which typically occurs during start-up.
> If the system is connected to the Internet, the Allied Air outdoor control can be updated over the Internet.
Make sure the software “auto update” is enabled. The software “auto update” can be toggled to prompt
the Allied Air server to update the thermostat which will update the Allied Air outdoor control. If the
system is not connected to the Internet, replace the Allied Air outdoor control with catalog number
17D27 or newer version.
• Inverter LEDs will ash code 29.
• Refer to the unit service documentation for detailed troubleshooting procedures.
Inverter ash code 29.
The sequence is:
• Red LED: Two Flashes
• Green LED: Nine Flashes
NOTE: Inverter normal operations with no error code present is as follows. Red LED is ON and Green LED
is OFF.
To clear alert code discon-
nect power to both the indoor
and outdoor units and then
reconnect power. Restart
system.
79
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
434 53
Service
Soon/Service
Urgent
OD Inverter
Comm Error to
Main Control
• Outdoor control has lost communications with the inverter continuously during a single thermostat call and
one hour period.
• Outdoor control will stop all compressor demands – moderate condition.
• Indoor blower will stop functioning.
NOTE: Indoor blower will not run in test mode either when alert code 434 is active. Only after system reset
will it operate.
• This alert code will occur if the outdoor unit power is turned off and the indoor unit power (24VAC to Allied
Air outdoor control) remains on, or if the indoor unit power is turned off (24VAC to Allied Air outdoor control)
and the outdoor unit power is on. This could occur while performing service or maintenance procedures
on the indoor or outdoor unit.
• The Allied Air outdoor control will attempt to re-establish communication to the inverter when the alert code
434 occurs by cycling the outdoor unit contactor off for two minutes. Upon energizing the contactor the
Allied Air outdoor control will attempt to communicate to the inverter for three minutes. This process will be
repeated three times in attempt to establish communication before locking out.
• If the unit is locked out with a critical alert code 434, reset the system by cycling the outdoor unit power off
and back on. Then cycle the indoor power off (24VAC to the Allied Air outdoor control) and then back on.
• If this condition continuously occurs during a one hour period and during a single thermostat call, the
outdoor unit will lock out and display alert code 434 – critical condition.
Troubleshooting Options:
• Check for loose or disconnected electrical connections.
• Interruption of main power to inverter.
• Inverter LEDs will ash code 53.
• Refer to the unit service documentation for detailed troubleshooting procedures.
Inverter ash code 53.
The sequence is:
• Red LED: Five Flashes
• Green LED: Three Flashes
NOTE: Inverter normal operations with no error code present is as follows. Red LED is ON and Green LED
is OFF
Automatically clears when
the system detects that the
issue no longer exists.
If the unit is locked out with a
critical alert code 434, reset
the system by rst cycling
the outdoor unit power off
and back. Then cycle the
indoor power off (24VAC to
the Allied Air outdoor control)
and then back on.
80
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
435 60
Service
Urgent
OD Inverter
EEPROM
Checksum fault
Inverter internal error.
• When this error occurs, the outdoor control will cycle power to the inverter by opening the contactor for two
minutes – moderate condition.
• Outdoor control will cycle power to the inverter three times and then outdoor unit is locked out – critical
condition.
• Inverter LEDs will ash code 60.
• Refer to the unit service documentation for detailed troubleshooting procedures.
Inverter ash code 60.
The sequence is:
• Red LED: Six Flashes
• Green LED: Off
NOTE: Inverter normal operations with no error code present is as follows. Red LED is ON and Green LED
is OFF.
To clear alert code discon-
nect power to outdoor unit
and restart.
436 62
Service
Soon/Service
Urgent
OD Inverter
High Heat-Sink
Temperature
Inverter heat sink temperature exceeded limit.
• This occurs when the heat sink temperature exceeds the inverter limit. Inverter will issue inverter alert
code 13 rst and slow down to try to cool the heat sink.
• If temperature remains high, outdoor unit will stop both compressor and fan – moderate condition.
• Anti- short cycle is initiated.
• If condition occurs ve times within an hour, system will lockout – critical condition.
• The screws that hold the inverter to the inverter board were loose causing poor contact between these
two components.
• Tighten screws that hold the heat sink to the inverter control board.
NOTE: Wait ve minutes for all capacitors to discharge before checking screws.
• Inverter LEDs will ash code 62.
• Refer to the unit service documentation for detailed troubleshooting procedures.
Inverter ash code 62.
The sequence is:
• Red LED: Six Flashes
• Green LED: Two Flashes
NOTE: Inverter normal operations with no error code present is as follows. Red LED is ON and Green LED
is OFF.
Moderate condition will
automatically clear when the
inverter sends an alert code
clear message.
Critical condition is cleared
by disconnecting power
to the outdoor unit and
restart.
81
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
437 65
Service
Soon/Service
Urgent
OD Inverter
Heat-Sink temp
Sensor Fault
Heat sink temperature sensor fault has occurred (temperature less than 4ºF or greater than 264ºF after 10
minutes of operation).
• When the temperature sensor detects a temperature less than 4ºF or greater than 264ºF after 10 minutes
of operation.
• Outdoor unit will stop both compressor and fan – moderate condition.
• Anti-short cycle is initiated.
• If condition occurs ve times within an hour, system will lockout – critical condition.
• Inverter LEDs will ash code 65.
• Refer to the unit service documentation for detailed troubleshooting procedures.
Inverter ash code 65.
The sequence is:
• Red LED: Six Flashes
• Green LED: Five Flashes
NOTE: Inverter normal operations with no error code present is as follows. Red LED is ON and Green LED
is OFF.
Moderate priority condition
will automatically clear when
the inverter sends an alert
code clear message.
Critical priority condition can
be cleared by disconnecting
and reconnecting power to
outdoor unit to restart.
438 73
Service
Urgent
OD Inverter PFC
Input Over-
current
The inverter has detected a power factor correction (PFC) circuit over-current condition.
• The inverter has detected an PFC over current condition. This may be caused by a high load condition,
high pressure, or outdoor fan failure.
• Outdoor control will display the code when the inverter has detected the error – moderate condition.
• After three minutes, the inverter will reset and the compressor will resume operation.
• If the error condition occurs 10 times within a 60 minute rolling time period, the outdoor unit control will lock
out operation of the outdoor unit – critical condition.
• Possible issue is system running at high pressures.
• Check for high pressure trips or other alert codes in thermostat and outdoor control.
• Inverter LEDs will ash code 73.
• Refer to the unit service documentation for detailed troubleshooting procedures.
Inverter ash code 73.
The sequence is:
• Red LED: Seven Flashes
• Green LED: Three Flashes
NOTE: Inverter normal operations with no error code present is as follows. Red LED is ON and Green LED
is OFF.
Moderate priority condition is
automatically cleared when
the inverter sends a clear
message.
Critical priority condition will
automatically clear when
inverter is power cycled.
82
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
440 13
Information
Only-Dealer
OD Inverter
Compressor
Slowdown -
High Heat-Sink
temperature
Compressor slowdown due to high heat sink temperature.
• Heat sink temperature is approaching limit.
• The compressor speed automatically slows to reduce heat sink temperature.
• The control sets indoor CFM and outdoor RPM to values according to demand percentage rather than the
actual Hz.
• The screws that hold the inverter to the inverter board may be loose causing poor contact between these
two components.
• Tighten screws that hold the heat sink to the inverter control board.
NOTE: Wait ve minutes for all capacitors to discharge before checking screws.
• This error code is primarily for informational purposes as the inverter controls the compressor speed
to operate within design parameters. Typically the inverter will make a minor speed reduction of 4 Hz
(approximately a 5-6% speed reduction) for a brief period of time and to reduce the heat sink temperature
and will then resume normal operation. This may occur at high outdoor temperatures (above 110ºF) for
brief periods of time (3 – 4 minutes) and is normal and expected operation of the inverter controlling the
compressor safely within design parameters.
• The inverter nned aluminum heat sink is located on the back side of the inverter in the condenser air
stream. If the alert code 440 occur frequently, especially at lower outdoor temperatures, check the heat
sink for debris that may reduce heat transfer or possible obstructions that may impact air ow across
the heat sink.
• The inverter will begin to briey reduce the compressor speed when the heat sink temperature rises
above 185ºF and will allow the inverter to resume the requested compressor demand speed once the
inverter heat sink reaches 176ºF. The heat sink temperature, compressor speed in Hertz & the Inverter
Compressor Speed Reduction status (“On” or “Off ”) notication can be viewed under the outdoor unit
Diagnostics section of the thermostat dealer control center.
• Inverter LEDs will ash code 13.
• Refer to the unit service documentation for detailed troubleshooting procedures.
Inverter ash code 13.
The sequence is:
• Red LED: One Flash
• Green LED: Three Flashes
NOTE: Inverter normal operations with no error code present is as follows. Red LED is ON and green LED
is OFF.
Automatically clears when
the condition no longer
exists.
83
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
441 14
Information
Only-Dealer
OD Inverter
Compressor
Slowdown - High
Compressor
Current
This alert code is for more information than an issue with the system.
• When the inverter gets close to the current or heat sink temperature limit, it will limit the ramp rate. Instead
of changing compressor speed at 1 hz/second, it changes to 5 hz/20 seconds.
• Compressor slowdown due to high compressor current.
• Compressor current is approaching limit.
• The compressor speed automatically slows.
• This error code is primarily for informational purposes as the inverter controls the compressor to operate
within design parameters. Alert code 441 typically occurs at startup as the compressor current increases
rapidly during startup.
• The inverter will reduce the compressor speed by 4 Hz and slow the compressor ramp up speed to the
requested compressor demand speed (capacity). This is normal and expected operation of the inverter
to control the inverter within design parameters. In most cases the alert code 441 notication does not
require any additional service or diagnostic procedures.
• The control sets indoor CFM and outdoor RPM to values according to demand percentage rather than the
actual Hz.
• Possible issue is system running at high pressures.
• Check for high pressure trips or other alert codes in thermostat and outdoor control.
• Inverter LEDs will ash code 14.
• Refer to the unit service documentation for detailed troubleshooting procedures.
Inverter ash code 14.
The sequence is:
• Red LED: One Flash
• Green LED: Four Flashes
NOTE: Inverter normal operations with no error code present is as follows. Red LED is ON and green LED
is OFF.
Automatically clears when
the condition no longer
exists.
442
Service
Urgent
OD Compressor
Top Cap Switch
Strikes Lockout
The top cap switch has opened ve times within one hour. As a result, the outdoor unit is locked out.
• This condition occurs when compressor thermal protection sensor opens ve times within one hour.
• Outdoor unit will stop.
To clear, disconnect power to
outdoor unit and restart.
443
Service
Urgent
OD MUC Unit
Code To Inverter
Model Mismatch
The Allied Air variable capacity unitary control (outdoor control) has incorrect appliance unit size code
selected.
• Check for proper conguring under unit size code used for outdoor unit (see unit conguration guide or in
installation instructions).
• If replacing inverter, verify inverter model matches unit size.
• Remove the thermostat from the system while applying power and reprogramming.
Automatically clears after the
correct match is detected
following a power reset.
84
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
444
Service
Urgent
HP Reversing
Valve Relay Or
Solenoid Fault
Relay failure. Verify by call for heat pump heating. Check for 24VAC out from O.
Replace Outdoor Unit
Control Board.
446
Service
Soon/Service
Urgent
OD Low Suction
Pressure Fault
Suction pressure < 40 psig in operation.
Error code initially will be a moderate and will escalate to critical and stop system operation. After 5-strikes
during a single thermostat demand. Recommend replacement of low pressure switch.
Recommend replacement of
low pressure switch.
530 Service Soon
ZS Low Damper
24VAC Voltage
• Check 24VAC voltage to all dampers.
• Check 24VAC damper transformer.
• Check connections.
Replace transformer if
applicable.
532
Information
Only-Dealer
ZS Zoning
Pressure Switch
Opened (High
Pressure)
Zoning Pressure Switch Opened (high pressure).
• Compressor pressure is above the specied limit.
• Compressor is turned off.
• Zoning will be restored once the high pressure switch closes.
Occasionally we get this with an AC system and the x is to just jump out the pressure switch terminals on
the damper control module board.
Automatically clears after
compressor pressure is
within limits.
542 Service Soon
ZS Zone 1 Temp
Sensor Fault
Possible Causes:
• Zone temperature sensor reading out of range.
• Check for loose or incorrectly wired connections at the zone sensor or damper control module terminals.
• Open or short zone temperature sensor detected for more than ve second.
• More than one zone sensor has the same assigned zone number. Check zone sensor(s) zone number
assignment.
System Response:
• Both types of zone sensors will display “--” as the indoor temperature on the main screen.
• Damper control module will operate in central mode (all dampers open) in both moderate and critical
priority conditions.
• If after 10 minutes the condition does not change, the applicable alert code (542, 543, 544 or 545) is
escalate by the Allied Air Comfort Sync
®
thermostat to critical. System will continue to operate in central
mode.
• At the Allied Air Comfort Sync
®
thermostat, only zone 1 screen will be available.
NOTE: The Allied Air Comfort Sync
®
thermostat will display the alert code as “Problem (Zoning Control)”.
Email notications will describe the issue as “ Zone “X” Temp Sensor Problem.
Automatically clears 30
seconds after condition no
longer exist.
543 Service Soon
ZS Zone 2 Temp
Sensor Fault
544 Service Soon
ZS Zone 3 Temp
Sensor Fault
545 Service Soon
ZS Zone 4 Temp
Sensor Fault
546 Service Soon
ZS Parameters
resetting from
restored power
An EEPROM is a memory device that stores and remembers the information even after power has been
removed from the device. It saves settings that the user might have selected like to desired heating and
cooling temperatures. When power is removed and then comes back on, the zone sensors (or thermostat
for zone 1) remembers what the users setting were. Code 546 is given if the zone sensor notices that the
EEPROM has an issue right after power is rst applied. The system will set itself to energy save mode and
continue to operation
Zone sensor will have to be
replaced.
85
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
547 Service Soon
ZS Parameters
resetting
from system
interruption
An EEPROM is a memory device that stores and remembers the information even after power has been
removed from the device. It saves settings that the user might have selected like to desired heating and
cooling temperatures. When power is removed and then comes back on, the zone sensor remembers
what the users setting were. Code 547 is given if the zone sensor notices that the EEPROM has an issue
sometime later after the product has been on for a while. It will not raise the issue until it needs to again
read from the EEPROM memory when it is rst powering to retrieve the necessary information. System will
operate in a normal mode operator until power off.
Zone sensor will have to be
replaced.
548 Service Soon
ZS Humidity
Sensor Error
Without humidiers or dehumidiers, sensor reads out of range 0% to 100%. This message indicates
humidity sensor has malfunctioned.
Zone sensor will have to be
replaced or if sensor auto
corrects itself the alert will
be automatically cleared and
system will return to normal
operations.
551 Service Soon
ZS Zone
Sensor Lost
Communication
Any lost communication between any zone sensor and the damper control module will result in applicable
alert code(s) being displayed (543, 544 or 545) at the thermostat.
• A pop-up display on the thermostat will appear indicating a communication error.
• Indoor temperature for the specic zone in error will displayed as “--” on the home screen.
• When any zone sensor loses communication with the damper control module, the entire system will go into
central mode (single temperature control).
Check for loose, damage or incorrect wiring between damper control module and the zone sensor reporting
alert code 551.
Once communication is
reestablished the zone
sensor will return to normal
zone operations.
600
Information
Only-Dealer
Load Shed Event
Compressor has been cycled OFF on utility load shedding.
• Load shedding function provides a method for a local utility company to limit the maximum power level
usage of the outdoor unit.
• The feature is activated by applying 24VAC power across the L and C terminals on the outdoor control
Automatically clears when L
terminal is inactive.
601
Information
Only-Dealer
OD Unit Low
Ambient
Operational
Lockout
• Outdoor unit has been cycled off on low temperature protection.
• Outdoor unit will not operate when the outdoor ambient is at or below 4°F (-15.6°C).
• If the unit is satisfying a demand (running) and the outdoor ambient drops below 4°F (-15.6°C), the unit
will continue to operate until the demand has been satised or the outdoor ambient drops to 15°F (-9.4°C)
which will result in the unit being locked out (shut down).
Automatically clears when
low temperature condition no
longer exists.
610
Service
Urgent
Low Room
Temperature
Detected
This alert will automatically notied the user that a low room temperature condition exist. A notication is
displayed on the HD display and email notication sent to homeowner and dealer.
The freeze alert protection parameter range is 30°F to 50°F (-1.11 to 10.0°C). Default is 40°F (4.44°C).
NOTE: Notication is dependent on the thermostat having a active Wi-Fi connection and the user account
has been setup and includes a valid email address.
Automatically clears when
condition is resolved.
86
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
611
Service
Urgent
High Room
Temperature
Detected
This alert will automatically notied the user that a high room temperature condition exist. A notication is
displayed on the HD display and email notication sent to homeowner and dealer.
The heat alert protection parameter range is 80°F to 100°F (26.67 to 37.78°C). Default is 90°F (32.22°C).
NOTE: Notication is dependent on the thermostat having a active Wi-Fi connection and the user account
has been setup and includes a valid email address.
Automatically clears when
condition is resolved.
700
Service
Urgent
Thermostat Temp
Sensor Problem
The HD display’s internal temperature sensor is not operating correctly. To resolve this issue, try the
following:
• Remove HD display from subbase and reattaching.
• Seal hole in wall behind subbase to minimize exposure to unconditioned air from inside the wall.
• Run “reset all” under dealer control center.
• If issue persist, then replace the HD display.
Automatically clears when
the system detects that the
issue no longer exists.
701
Service
Urgent
Thermostat Temp
Above Limit
The thermostat is reading indoor temperatures above the pre-programmed limit. The thermostat has a
built-in non-adjustable high limit of 99°F.
• Cool thermostat.
• Adjust set point.
• Run reset all under dealer control center.
• Replace HD display, if needed.
Automatically clears when
the system detects that the
issue no longer exists.
703 Service Soon
Thermostat
Humid Sensor
Problem
Thermostat Humid Sensor Problem. Sensor is damaged or data is corrupted possibly..
First try a system reset, then
if persists the thermostat
would need replacement.
3000 Maintenance Replace Filter 1 Not Applicable
Reset lter reminder for
both.
3001 Maintenance Replace Filter 2 Not Applicable
3002 Maintenance
Replace
Humidier Pad
Not Applicable
Reset Humidier pad
reminder.
3003 Maintenance Replace UV Bulb Not Applicable Reset UV Light reminder.
87
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
3004 Maintenance
Maintenance
Reminder
Not Applicable
Make service appointment
with dealer and reset
reminder.
65537
Service
Urgent
Missing Base
• Base not detected and alarm 65538 has been raised over 30 times.
• Amber LED is displayed on Smart Hub.
• Mount and wire subbase before powering up Smart Hub.
Automatically clears once is
detected for two seconds.
65538
information
Only-Dealer
Missing Base
• Base not detected for at least 30 seconds.
• Amber LED is displayed on Smart Hub.
• Mount and wire subbase before powering up Smart Hub.
Automatically clears once is
detected for two seconds.
65539
Service
Urgent
Thermostat Lost
Connection Or
Internal Fault
• HD wall display not detected for more than 30 seconds.
• Typically the thermostat will send a command to the unknown device and place it in a soft disable state.
The Allied Air communicating control with the soft disable state will indicate so as follows:
• On air handler, furnace and outdoor controls, the state is displayed by double horizontal lines on seven-
segment display.
• On the damper control module, the green LED will ash 3 seconds on and 1 second off.
• On the equipment interface module, the green LED will ash 3 seconds on and 1 second off.
Cycling power to the soft disabled control may clear the condition. If cycling power does not clear the soft
disable state then replace control.
Automatically clears once is
detected for two seconds.
65540
Information
Only-Dealer
Missing HD wall
display
• HD wall display not detected for less than 30 seconds.
• Typically the thermostat will send a command to the unknown device and place it in a soft disable state.
The Allied Air communicating control with the soft disable state will indicate so as follows:
• On air handler, furnace and outdoor controls, the state is displayed by double horizontal lines on seven-
segment display.
• On the damper control module, the green LED will blink three seconds on and one second off.
• On the equipment interface module, the green LED will blink three seconds on and one second off.
Cycling power to the soft disabled control may clear the condition. If cycling power does not clear the soft
disable state then replace control.
Automatically clears once is
detected for two seconds.
88
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
65541
Information
Only-Dealer
Download Failed
• Download for rmware failed.
• Typically the thermostat will send a command to the unknown device and place it in a soft disable state.
The Allied Air communicating control with the soft disable state will indicate so as follows:
• On air handler, furnace and outdoor controls, the state is displayed by double horizontal lines on seven-
segment display.
• On the damper control module, the green LED will blink three seconds on and one second off.
• On the equipment interface module, the green LED will blink three seconds on and one second off.
Cycling power to the soft disabled control may clear the condition. If cycling power does not clear the soft
disable state then replace control.
Not applicable.
65542
Information
Only-Dealer
Update Failed
• Has verication failed. Update failed.
• Typically the thermostat will send a command to the unknown device and place it in a soft disable state.
The Allied Air communicating control with the soft disable state will indicate so as follows:
• On air handler, furnace and outdoor controls, the state is displayed by double horizontal lines on seven-
segment display.
• On the damper control module, the green LED will blink three seconds on and one second off.
• On the equipment interface module, the green LED will blink three seconds on and one second off.
Cycling power to the soft disabled control may clear the condition. If cycling power does not clear the soft
disable state then replace control.
Not applicable.
Automatically clears once is
detected for two seconds.
65543
Information
Only-Dealer
Firmware
Updated
• When new rmware has been successfully updated to the thermostat.
• Typically the thermostat will send a command to the unknown device and place it in a soft disable state.
The Allied Air communicating control with the soft disable state will indicate so as follows:
• On air handler, furnace and outdoor controls, the state is displayed by double horizontal lines on seven-
segment display.
• On the damper control module, the green LED will ash 3 seconds on and 1 second off.
• On the equipment interface module, the green LED will ash 3 seconds on and 1 second off.
Cycling power to the soft disabled control may clear the condition. If cycling power does not clear the soft
disable state then replace control.
Clears automatically after
successfully update.
65544
Information
Only-Dealer
More Than 5
Tstats In A Group
The system is limited to no more than ve (5) Smart Hubs assigned to one group. You can have up to nine
groups (1-9) with ve Smart Hubs assigned to each. If you have more than 5 Smart Hubs assigned to a
single group, then alert code 65544 will be displayed.
If you DO NOT exceed the ve Smart Hubs per group limitation, you will NOT get an alert code 65544.
EXAMPLE: If you had two groups with six Smart Hubs assigned to each group, then you would get each
minute twelve alert code 65544 notications.
Once the system detects that
only ve or less Smart Hubs
are detected in one group will
the alert code automatically
clears.
89
Table 1. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual
Displayed Alert
Text Under
Dealer Control
Center >
Notications
Component or System Operational State and Troubleshooting Tip
How to Clear
Alert Code
65545 Service Soon
Cooling Capacity
Alert
Cooling operation may not be sufcient for the hottest days. Based on local conditions and climatological
data for zip code.
EXAMPLE: Dirty Filter, Low refrigerant charge, TXV, etc. Symptom during mild temperatures may in-
clude; system running longer than normal but not showing any other symptoms.
Auto cleared on next
prediction.
-- Service Soon --
Possible loose or mis-wired connections or two zone sensors are assigned the same zone number. Two
dashes will be displayed on the A3 thermostat for indoor temperature and/or zone sensor. The system will
go into central mode. Individual zone functions is disabled. Anytime the zone sensor loses communication
with the damper control module, the entire system will go into central mode. If two sensors are assigned
the same zone number, this could result in the double dashes to appear as well.
If two zone sensors are
assigned the same zone
number, this could cause the
double dashes to appear. If
loose or mis-wired connec-
tion was conrmed, correct
the issue and run the re-con-
guration procedure.
90
Index
A
Advanced Dehumidication Descrip-
tions 42
Airow Prole - Cooling 36, 37
Alert Codes and Troubleshooting 50
Auto Brightness 39
Auto Changeover
Humidif. Deadband 18
Temp Deadband 18
Auto Dehumidication Overcooling
Threshold 18
Automatic Max Defrost 33
Aux Heating Activation Threshold
18
B
Balance Point Control 19
Boot-up Screen 15
Brightness Value 39
C
Commissioning
Using the HD Display 15
Using the Mobile Setup App 13
Compressor Shift Delay ON / OFF
33, 34
Compressor Short Cycle Delay 33,
35
Continuous Indoor Blower Airow
36, 37
Cooling Indoor Blower
Off Delay 36, 38
On Delay 36, 38
Cooling Mode 19
Cooling Prognostics 19
D
Dealer Control Center 17
Defrost Termination Temp 34
Dehumidication
Airow % 38
Airow Adjustment Adder 34, 35
Set Point 42
Setting Options 42
Dew Point Adjustment 20
Diagnostics 41
Dimensions 3
Discharge Air Sensor (DATS) 8
Integral Gain 19
Offset 19
Proportional Gain 20
Display
Indoor Humidity 39
Outdoor Weather 39
E
Electrical
Specications 3
Troubleshooting 49
Electric Heat
Airow 36
Control Mode 20
Stages During Defrost 20
Energy Recovery Ventilator (ERV)
45
Equipment Found Screen 16
Equipment Name
Air Conditioner 35
Air Handler 36
Furnace 38
Heat Pump 34
Smart Hub 20
Zoning Control 39
F
Factory Reset
Smart Hub 40
Thermostat 40
Fan Cycling 34
Freezing Alert Temperature 26
Fresh Air Damper 16
Fresh Air Dampers 45
G
Gas Heat Control Mode 20
Gas Heating Activation Temp Differ-
ence 21
H
HD Display
External Components 7
Heat / Cool Stages Locked In 21
Heating Airow Control Type 38
Heating Indoor Blower
Off Delay 36, 38
On Delay 36, 38
Heat Recovery Ventilator (HRV) 45
High
Balance Point 19
Cooling Airow 37, 38
Heating Airow 38
HP Airow 37, 38
Normal Cooling Airow 34, 35
Normal HP Heating Airow 34
HP
Blower On Delay 39
Heating Lockout Time 24
Heating Mode 24
Indoor Blower Off Delay 37, 38
Indoor Blower On Delay 37
Humidity Reading Calibration 24
I
Information 41
Installation
Recommendations 3
Report 41
L
Lock In 2nd Stage HP by Outdoor
Temp 25
Low
Balance Point 19
Battery Status 15
Cooling Airow 37, 39
Heating Airow 39
HP Airow 37
Normal Cooling Airow 35, 36
Normal HP Heating Airow 35
Low Voltage Wiring 8
M
Max
Defrost by Weather 35
Heat Setpoint 25
Humidication Setpoint 25
Min
Cool Setpoint 25
Dehumidication Setpoint 25
Mobile Applications 50
Modulating
Cooling Cycles Per Hour 25
Cooling Steady State PI Gain 25
Cooling Step Change PI Gain 25
Gas Heating Cycles Per Hour 26
Gas Heating Steady State PI Gain 26
Gas Heating Step Change PI Gain 26
HP Heating Cycles Per Hour 26
HP Heating Steady State PI Gain 26
HP Heating Step Change PI Gain 26
N
Number of Gas Heating Stages 26
O
Operating Environment 3
Outdoor Air Sensor 8
Outdoor Temperature
Calibration 26
Reading Calibration 18
Source 40
Overcooling 42
P
Proximity Control 40
R
Received Signal Strength Indication
(RSSI) 47
Re-congure System 40
Reset
Air Conditioner 36
Air Handler 37
Furnace 39
Heat Pump 35
HVAC Equipment 40
Smart Hub 26
Thermostat 40
Zoning Control 39
S
Screen Locked 40
Screen Saver 40
Smart Alert Enable 27
Smart Hub
Control Wiring Requirements 8
Group ID 24
Installation 3
LEDs 5
Multiple Devices 15, 24
Parameters 18
Push Button 4
Restart 15, 40
Terminals 5
Soft Disable 50
Stage
Delay Timers 28
Differentials 28
T
Temperature Control Mode 29, 31
Temp Hold 27
Temp Reading Calibration 28
Terminal Designations 6, 8
Tests 41
Troubleshooting Wi-Fi Connection
47
V
Ventilation
Control Mode 45
Control Mode Parameters 29
Control Wiring 13
Filter 16
Maintenance 16
Reminders 16
W
Wall Insulation 31
Warning Screen 15
Wide Setpoint 40
Wi-Fi 46
Access Point Hidden 46
Setting Up Connection 46
Signal Strength Indicator 47
Troubleshooting 47
Visible Access Point 46
Wiring Diagrams 9
Z
Zone 1 through 4
Continuous Blower CFM 31
Cooling CFM 32
Heating CFM 32
Temp Reading Calibration 39
Zoning
Anticipated Discharge Air Temperature
Adjustment 32
Continuous Blower CFM 31
Gas Heating DAT Cool Down Target
32
Minimum Zone Run-Time 32
Supply Air Temp Limit for Cooling 32
Supply Air Temp Limit for Gas / Electric
Heating 32
Target Supply Air Temp for Cooling 32
Target Supply Air Temp for HP Heating
32
Zoning Target Supply Air Temp for
Gas/Electric Heating 33
