Comfort Sync A3 Assembly instructions

Comfort Sync A3
Ultra Smart Thermostat
Installation and Setup Guide
508026-01 12/2019
Copyright 2019©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 Conguration 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 Airow Per Zone.................................................................................................. 17
Commissioning Completion........................................................................................... 17
Dealer Control Center .............................................................................................17
Equipment Parameters ........................................................................................18
Tests.....................................................................................................................40
Diagnostics...........................................................................................................40
Installation Report ................................................................................................40
Information ...........................................................................................................40
Dehumidication Settings ......................................................................................41
Dehumidication Setting Options.........................................................................41
Overcooling..........................................................................................................41
Dehumidication Set Point...................................................................................41
Advanced Dehumidication Descriptions.............................................................41
Displaying Outdoor Temperature (Sensor) and Indoor Humidity on the
Home Screen............................................................................................................43
Displaying the Outdoor Sensor Temperature on the Home Screen.....................43
Displaying the Indoor Humidity on the Home Screen ..........................................43
Comfort Sync Zoning .............................................................................................43
Ventilation (ERV, HRV and Fresh Air Damper) ......................................................44
Energy Recovery Ventilator (ERV).......................................................................44
Heat Recovery Ventilator (HRV) ..........................................................................44
Fresh Air Damper.................................................................................................44
Zoning Application ......................................................................................................... 44
Operation of Fresh Air Dampers with Environmental Overrides.................................... 44
Ventilation Control Modes ....................................................................................44
Wi-Fi Connection .....................................................................................................45
Performance Reports..............................................................................................46
Notications.............................................................................................................47
Alert Code Types..................................................................................................47
Service Notication Codes...................................................................................47
Alert Codes ..........................................................................................................47
Electrical Troubleshooting .....................................................................................87
Overview ..............................................................................................................87
Denitions ............................................................................................................87
Testing..................................................................................................................87
Technical Support ...................................................................................................87
Index .........................................................................................................................88

3
Shipping and Packing List
Quantity Description
1Comfort Sync A3 ultra smart thermostat includes a Smart Hub
and HD Display
4 Mounting screws (#6 X 1.25” pan head)
4Wall anchors (alligator anged solid wall anchors)
1 Installation and setup guide
1 User guide
1Warranty certicate
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 qualied 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 specic
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 notication screen or the menu / settings > advanced settings > dealer
control center > notications screen.
Alert codes which require manual clearing can only be done under the dealer control center > notication 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
R24VAC input 18AWG unshielded
I+ RS-BUS I+ 22AWG shielded
(recommended)
(2-pair conductor only)
I- RS-BUS I-
C24VAC 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
ACommunications bus A 22AWG shielded
(recommended)
(2-pair conductor only)
BCommunications 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
ACommunications bus A
BCommunications 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 specication 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 airow, where other accessories (such as humidiers,
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 dehumidication 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 reect stored heat energy onto the sensor and send inaccurate
information to the thermostat.
• Locate the sensor away from attic and soft 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 congurations.
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