Comfort Sync A80DS2V Assembly instructions

© 2016
ALLIED AIR ENTERPRISES
215 METROPOLITAN DR.
WEST COLUMBIA, SC 29170
indoor temperature
indoor humidity is 41%
cool-to
set temp
75
heat to
72
spring ...
program
is on
outdoor
temperature
80
system is cooling
forecast
Hi 85
Lo 60
9:39 am Aug 15, 2012
Wi-Fi
enter
away
?
fan is
OFF
fan is
AUTO
THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER
FOR FUTURE REFERENCE
NOTICE
Read this manual before programming this thermostat.
Use this thermostat only as described in this manual.
INSTALLER'S SYSTEM SETUP
GUIDE
Comfort Sync Thermostat
Touchscreen Programmable Communicating Thermostat
CONTROLS
507175-01
6/2016
Supersedes 3/2016
WARNING
Improper installation, adjustment, alteration, service or maintenance
can cause property damage, personal injury or loss of life.
Installation and service must be performed by a licensed professional
HVAC installer (or equivalent) or service agency.
Comfort Sync-Enabled Units
A80DS2V A80US2V2 A96DS2V A96US2V
A97DSMV A97USMV BCE4M_S BCS2M_S
4SCU16LS 4SCU18LS 4SCU20LX 4SHP16LS
4SHP18LS 4SHP20LX

2
TABLE OF CONTENTS
Comfort Sync Thermostat - Technical Description and Features 2...
Installation and Setup 3........................................
Adjusting System Settings 4....................................
Establishing Wi-Fi and Internet Connections 5.....................
Troubleshooting Wi-Fi 5........................................
Account Registration 8.........................................
Firmware Update 9............................................
Adding Non-Communicating Outdoor Unit and Accessories 9.........
Outdoor Unit (Air Conditioner or Heat Pump) 9....................
Bypass (24VAC) Humidifier 9...................................
Auxiliary Dehumidifier 10......................................
Adjusting Humidification and Dehumidification Settings 10...........
Using the Tests / Diagnostics Features 12..........................
Alert Codes 14.................................................
Wiring Diagrams 27.............................................
Secure Web Portal 30...........................................
Screen-saver 30................................................
Accessing Installer Screens and Changing Equipment Parameters 31..
WARNING
This is a 24VAC Class 2 thermostat. Do not install on voltages higher
than 30VAC.
Do not switch system to cool if the outdoor temperature is below 45°F
(7°C). This can damage the cooling system.
Shipping and Packing List
1 - Comfort Sync Thermostat 4 - Mounting Screws
4 - Wall Anchors
1 - Homeowner's Manual
1 - Warranty Card
Comfort Sync Thermostat - Technical Description and
Features
The 24VAC Comfort Sync thermostat is an electronic communicating,
color display touchscreen and 7-day programmable thermostat. It stores
system parameters and settings in non-volatile memory (i.e., it retains data
when electrical power fails or is turned off).
The Comfort Sync thermostat can connect to online services via the
Internet through the homeowner's Wi-Fi access point. After online
registration is completed, the system may then be accessed by the
homeowner from anywhere using a remote Internet connection via computer
or personal communicating device.
Refer to page 27 for information on making connections to the thermostat.

Comfort Sync 7-Day Programmable Communicating Thermostat
3
This thermostat supports:
 Wireless bands 802.11b, 802.11c and 802.11n
 Three languages (English, French, Spanish)
 Air conditioning or heat pump units with up to four stages of heat / two
stages of compressor operation (2 stages of heat pump heating, 2
stages of auxiliary back-up heating and 2 stages of emergency
heating)
 Multiple-stage heat / cool and universal compatibility
(gas/electric/heat pump/air conditioner).
 Dual-fuel capable (Comfort Sync-enabled HP only) with two balance
points.
 Indoor air quality with time‐based notification of consumables
including media filters, UVC bulbs and humidifier pads.
 Humidification measurement and control.
 Dew point adjustment control
 Multiple-stage HVAC systems
 Equipment maintenance reminders
 Autochangeover mode -- Permits control of heating, cooling,
humidification, and dehumidification without user involvement
OUTDOOR TEMPERATURE SENSOR
All Allied branded communicating outdoor units contain a built-in outdoor
temperature sensor.
Installation and Setup
COMMUNICATION ERROR SCREEN
During initial thermostat start-up if the following screen appears (see figure
1), this will indicate that the thermostat has been incorrectly wired or has
shorted wires. Turn power off to the system and verify that all wiring is
correct.
Figure 1. Communication Error Screen

4
Adjusting System Setting
SET TIME AND DATE
Use the arrows to select Time and Date; touch edit to proceed to the “Set
current time and date” screen.
When “Time and Date” screen appears, enter the correct date as follows:
 Use the left and right arrows to change the month and year.
 Touch a day of the month to select it.
 Touch on the hour or minute; up down arrows appear to allow change.
 Touch the am/pm field to toggle it between am and pm.
 When the correct date and time is set, touch save to save settings and
return to previous settings screen.
Touch next to continue to next screen.
CIRCULATE FAN ON TIME SETTING
“Circulate” is enabled on the user's home screen or system settings page.
It keeps air circulating from 15% to 50% percent of time. The following
settings approximate how long the fan will run at these typical settings:
15% (9 minutes fan run time per hour)
25% (15 minutes fan run time per hour)
35% (21 minutes fan run time per hour)
45% (27 minutes fan run time per hour).
NOTE - If the circulate fan mode is on, a timer is set to measure all the time
that the fan is blowing, regardless if it is running to deliver heating or cooling
or just for air circulation.
The following table lists all of the installer configurable system level
parameters available from the installer setup screens. After adjusting
system settings, select next to continue.
Table 1. System Settings
Parameter
Name Default Parameter Value Setting Increment
Time and Date —(Time/date elements
screen) —
Daylight Saving
Time Enabled Enabled, Disabled —
Circulate Fan
ON Time 35% Range 15 to 45% 1%
Temperature
Unit Fahrenheit Fahrenheit or Celsius —
System Name —(keyboard input
screen) —
Dealer Name Allied (keyboard input
screen)
Note: When adding
the dealer number, all
other dealer fields will
auto populate once
thermostat registra
tion is completed.
—
Dealer Address — —
Dealer Phone —
Dealer Email — —
Dealer Website —

Comfort Sync 7-Day Programmable Communicating Thermostat
5
Establishing Wi-Fi and Internet Connections
WI-FI ROUTER CONNECTIVITY
(Thermostat to homeowner's Wi-Fi router). “Wi-Fi” in the bottom left corner is
the “button” used to access the Wi-Fi settings screen. “Wi-Fi” with a
beneath it indicates a prior connection to the server has been lost. If a
connection had been lost, then re-established, the triangle goes away. Wi-Fi
must be enabled, you must agree to the User Agreement, a local network
must be chosen, and a password may need to be entered. Follow the
step-by-step procedure outlined below.
1. Touch Wi-Fi.
indoor temperature
fan is
OFF
fan is
AUTO
system
off
fan is
AUTO
outdoor
temperature
80
?
9:39 am Aug 15, 2012Wi-Fi
enter
away
2. Touch Wi-Fi disabled.
WI-FIL SETTINGS
Press to enable /
disable Wi-FI
9:39 am Aug 15, 2012
disable
Thermostat is not connected to the Wi-FI network
WI-FI
Wi-Fi
X
?
3. Touch Next, Next, Accept
4. Touch Network Settings.
5. Touch the applicable network icon for your home Wi-Fi network.

6
choose a wireless network
add
new
network
NETWKB NETWKC NETWKD *NETGEAR
* Selecting one of these wireless networks may result in an unreliable connection to
your thermostat. Press help for tips on improving signal strength.
NETWKE * NETWKF *
NETWORK SETTINGS
6. Touch the password field (if secure network)
7. Type in the password (if secure network) using the pop-up online
keyboard by touching screen at blank line.
8. Touch save (if secure network).
9. Touch connect.
10. The Network Settings screen will appear. If connection is successful,
the selected the access point will show connected.
If connection was not successful, use the troubleshooting tips in the next
section.
Troubleshooting Wi-Fi
ROUTER / MODEM CHECK IF CONNECTION FAILS
1. Make sure the router and modem are turned on.
2. Check for connections to other wireless devices and internet
connection.
3. Make sure the Comfort Sync thermostat's Wi-Fi is enabled and
connected to the home network (AP).
4. If having difficulty connecting to the router, online research the router
model number and/or internet provider to discover and verify that the
router band is set to B, G or N bands. You will need to access the
routers utility program to make any changes. If not accessible please
contact your service provider for help. The thermostat will connect to
B, G or N band routers at this time. NOTE: When set to B or G bands,
video streaming will likely be slower that N band. If homeowner has
implemented a dedicated N band router for the purpose of video
streaming, a separate router for the thermostat may be required.
5. Reboot your router
A Unplug your power cord, wait 30 seconds, then reconnect. If you
have multiple routers, try rebooting all of them when problems
occur.
B If their are multiple routers you must have different name and
password for each one.
C On your computer, turning Wi-Fi off and then back on will force
the system to rescan for available networks. Do you see the
network your thermostat is trying to connect to?
6. Power cycle the thermostat.
7. Keep cordless phones, microwaves and other electrical equipment at
least 3.5 feet (1m) away from access point.
A Try moving your router closer to the device if possible. If
connection is improved, then there is probably some
interference. Must have signal stronger than -70db (also, see
Router Signal Strength on page 3); anything less will have signal
losses or not connect at all.
B Adjust the direction of the router toward the thermostat. Adjust
the routers antenna. A signal repeater may be needed.

Comfort Sync 7-Day Programmable Communicating Thermostat
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8. Try changing channels on the access point and test it out with one of
your internet devices (i.e. laptop, desktop). The IP address to the
server from the thermostat will be close to the same IP address from
the computer to the server (www.mycomfortsync.com).
COMPUTER CONNECTIONS:
1. On Access Point, Login to configuration (usually web based interface)
→ go to Wireless Settings select a different channel → Save settings.
2. Devices cannot change Wi-Fi channel. It is set only at the router.
3. On the thermostat, disable, then re-enable the Wi-Fi connection.
4. Antenna in thermostat is fixed and cannot be moved. Location of your
access point with respect to the thermostat is very important.
5. Baby monitors, garage door openers and wireless video cameras may
create signal interference.
6. Check your encryption key (Password).
7. Double check and re-enter your WEP/WPA encryption keys /
pass-phrases (usually found on the router). If set to WEP security,
change to WPA if allowed.
8. In your thermostat's wireless settings, verify that your encryption key
(password) is correct. There can not be spaces at the end of the SSID
or Password.
9. It is important to note that number of walls that the signal must pass
thru to reach the thermostat can be an issue. (e.g. 4 indoor walls, or
1 outdoor wall + 2 indoor walls could mean a weak signal at the
thermostat).
10. The addition of a signal repeater or extender maybe an option.
(desktop or wall outlet plug-in devices are available online or at your
local electronics stores in price range $70 - $150).
11. If multiple routers are in the home make sure each router has a different
name.
12. If you don't get the pop up box that says the registration request has
been forwarded, then the email was not sent to the server and the
return registration link will not be sent to your email address. Try all the
router troubleshooting procedures and if you still can't get it to send the
email, cycle the power to the thermostat. This will cause the thermostat
to ask for the Allied server mac address again and try to resend the
email.
13. If all is correct, refer user to their Router manufacturer and Network
provider. Router may have incoming fire wall check with service
provider.
ROUTER SIGNAL STRENGTH
After connecting to your router, you can check your signal strength by
pushing the Wi-Fi icon on the home screen, then the networks button, then
your network button, then the AP info button (see figure 2).
A strong wireless signal (RSSI) is indicated by a NEGATIVE decibel number
in the range from -46 to -58db; anything greater than -80db will not connect.
If you are connected but have a signal above -70db then you may consider
adding a signal repeater/extender or making some of the other router
adjustment mentioned in the Router / Modem Check section
AP Info
connect Push AP info
button
Figure 2. Access connection data
AT+NSTAT=?
MAC=00:ID:C9:A0:40:95
WSTATE=CONNECTED MODE=AP
BSSID=98:FC:11:47:B9:00 SSID= LINKSYS” CHANNEL=6 SECURITY=NONE
RSSI=-78
IP ADDR=192.168.8.117 SUBNET=255.255.255.0 GATEWAY=192.168.8.1
DNSI=192.168.1.1 DNS2=0.0.0.0
RXCOUNT=14 TXCOUNT=345
OK
Figure 3. Connection data

8
Thermostat Registration with Allied Server
(Homeowner's router and Internet Service Provider [ISP] to the Allied
Server). This connection is used when registering your thermostat.
(Connection is up or down and there is no strength indicator for this).
When there is not a good internet connection from the router to the internet,
the thermostat will not register. You will only known this if you input your
e-mail address and system description and touch on the register button and
see the thermostat “clocking” and the registration request pop up box is not
show.
If the the registration request pop-up box is shown then you should
receive an email back from the server to your email address directing
you to the consumer portal to make an account on the Allied server. If
you don't see it in your inbox make sure you check you Junk and Spam mail
boxes.
If you don't get the pop-up box that says the registration request has been
forwarded then the email was not sent to the server and the return
registration link will not be sent to your email address. Try all the router
troubleshooting procedures and if you still can't get it to send the email, cycle
the power to the thermostat. This will cause the thermostat to ask for the
Allied server mac address again and try to resend the email. If multiple
routers are in the home make sure each router has a different name.
iPhone®app, iPad®app, and Android™ app can be downloaded from the
App Store or Android™ Play Store.
1. Touch Wi-Fi.
2. Touch Thermostat not registered.
3. Type in homeowner's email twice (this ensure the email is typed
correctly); enter System Desc.
4. Touch register.
5. Message appears while (see figure 4).
Registration request has been forwarded.
Please check your email for instructions to complete registraiton.
If you do not receive an email, please ensure you entered your
email address accurately and/or check your spam folder.
Figure 4. Screen Message after Thermostat Registration is
Completed
User Account Registration for Allied Server Access
Figure 5. Registration Screen

Comfort Sync 7-Day Programmable Communicating Thermostat
9
NOTE - This following information is customer setup instructions and
is shown here to allow the installer to help walk the customer through
the setup process.
After registering through your Comfort Sync thermostat interface, go to
the homeowner's computer and locate the email sent from the server.
NOTE - if the customer has already setup an account, click the “Click
Here” button to access that account.
Click on the Register link; the screen (to the left) will appear. Fill in the User
Name and Password fields and check the agree to terms and conditions box.
Click Create User button.
A series of pages and prompts follows to provide guidance through profile
setup and user preference definitions.
Firmware Update
FIRMWARE UPDATE BUTTON
1. Firmware Update (Off) – No automatic firmware updates.
2. If the status is changed from Off to Auto, it will trigger an immediate
check and update for the firmware update. This can take up to 1 hour
to complete depending on the user's internet speed, signal strength,
internet traffic, etc.
3. Changing from Auto to Off during a download will NOT stop the current
download if it is already in process.
4. Firmware Update (Auto) – (Default state). If enabled, the thermostat
checks for firmware update a few minutes after commissioning and
then every 24 hours in early morning hours.
5. Once a download is completed, the thermostat stops all activity for up
to 3 seconds, restarts for 5 seconds, then continues with normal
operation. All prior system and user settings are retained (Equipment,
programs, Wi-Fi settings, etc.). Note a variation in indoor temperature
may be observed after restart. This is normal operation of the
thermostat while the temperature sensor algorithms adjust after a
restart of the system.
Adding Non-Communicating Outdoor Unit and Accessories
OUTDOOR UNIT (AIR CONDITIONER OR HEAT PUMP)
To add (or remove) an outdoor unit that is not Comfort Sync-enabled, you
must be at the “Add or Remove Non-communicating equipment?” screen.
1. Touch the yes button next to Add or Remove
Non-communicating equipment?.
2. In the “non-communicating device list” screen, use the arrows to
highlight Outdoor Unit Type and touch edit.
3. Touch one of the radio buttons to select a 1-or 2-stage air
conditioner unit or a 1-or 2-stage heat pump unit; touch save.
4. Use arrows to highlight any red colored text in the device list (e.g.
select Outdoor Unit Capacity; text turns white). Touch edit.
5. Use either the up or down arrows to display the correct size outdoor
unit. Touch save to continue.
NOTE - If the defaults are correct, you do not have to make any changes, but
you must touch save. When all red text is gone, the back button will appear;
touch it to return to the “Add or Remove Non-communicating equipment?”
screen.
ADDING A HUMIDIFIER
Before adding a humidifier, be sure that the:
 Humidifier is wired to the furnace or air handler control as shown in the
included quick start guide.
 Entire system is wired, powered up, and the thermostat has detected
the system's installed communicating devices, and you are at the “Add
or Remove Non-communicating equipment?” screen.
To add (or remove) a humidifier:
1. Touch the yes button on this screen.
2. In the “non-communicating device list” screen, use the arrows to
highlight Humidifier (note the current value, Not Installed) and touch
edit.
3. Touch one of the radio buttons to select the Bypass (24VAC)
Humidifier (or select Not Installed, if removing humidifier); touch
save.

10
4. The previous screen returns, but the current value now shows your
selection. Touch the back button.
5. The “Add or Remove...” screen reappears with your addition shown in
the system devices list. At this point, you may add more equipment
(touch yes) or if finished, touch the next button to advance to the
“Adjust a setting...” screen.
NOTE - Adding humidity regulating non-communicating devices may be a
2-step procedure:
First the device must be installed and wired. After the humidifier is
installed, the setting under the "System" mode "Humidification Control
Mode" defaults to "Basic".
Second, if you want another mode, i.e. Precision, Basic Dew Point,
or Precision Dew Point, the device requires further configuration.
ADDING AUXILIARY DEHUMIDIFIER
Before adding a dehumidifier, be sure that:
 the dehumidifier is wired to the furnace or air handler control as shown
on the optional accessories wiring diagram located in the provided
quick start guide.
 the entire system is wired, powered up, and the thermostat has
detected the system's installed communicating devices, and you are
at the “Add or Remove Non-communicating equipment?” screen.
To add (or remove) a dehumidifier, you must be at the “Add or Remove
Non-communicating equipment?” screen.
1. Touch the yes button on this screen.
2. In the “non-communicating device list” screen, use the arrows to
highlightDehumidifier and touch edit. Note the current value (e.g. Not
Installed).
3. Touch one of the radio buttons to select the Auxiliary Dehumidifier
(or select Not Installed, if removing dehumidifier); touch save.
NOTE - Humiditrol is not an available accessories. Do not select this option.
4. When you scroll to the dehumidifier device, (Note the current value,
e.g. Auxiliary Dehumidifier.) Click back to return to the “Add or
Remove...” screen.
5. The “Add or Remove...” screen reappears with your addition shown in
the system devices list. At this point, you may add more equipment
(touch yes) or if finished, touch the next button to advance to the
“Adjust a setting...” screen.
AUXILIARY DEHUMIDIFIER OPERATION
When this option is selected, dehumidification will be allowed under the
following conditions, provided there is NO call for humidification:
 In the absence of heating or cooling calls, or
 Simultaneous with blower only calls.
If the blower is required to operate while the auxiliary dehumidifier is running,
a separate wire must be installed from the auxiliary dehumidifier to the indoor
unit's G thermostat input that will energize G when the auxiliary dehumidifier
is running (see provided quick start guide)
Auxiliary dehumidification is controlled by the thermostat dehumidification
demand.
Adjusting Humidification and Dehumidification Settings
HUMIDIFICATION SETTINGS — SYSTEM DEVICES SCREEN
Pre-adjustment REQUIREMENTS:
First the device has been installed.
Second, you pressed next at the “Add or Remove...” screen.
DISPLAY, BASIC AND PRECISION—These modes allow user control of
relative humidity between 15 and 45%. These conditions must be met for
either mode to operate:
 humidification mode has been enabled, and
 the unit is in HEAT mode, and
 humidification demand exists (24V present at H), and
DISPLAY mode indicates humidification is OFF.
BASIC mode mode also requires presence of heating demand [Y for
HP heat, or W for gas heat (W may be energized with G de-energized)].
PRECISION—(Available only if Wi-Fi is operational or outdoor sensor
is attached)

Comfort Sync 7-Day Programmable Communicating Thermostat
11
Basic Dew Point Control adjustment mode will change the humidification
setpoint based on the outdoor temperature and a user-defined dew point
adjustment setting.
Precision Dew Point Control adjustment mode will operate when these
conditions are met:
 humidification mode has been enabled, and
 the unit is in HEAT mode, and
 humidification demand exists (24V present at H).
Configure the device as follows:
1. In the “system devices” list, use the arrows to highlight System. Touch
edit.
2. In the “System” list, use the arrows to highlight Humidification
Control Mode. Touch edit.
3. Touch one of the radio buttons to select the mode of humidification
control; touch save.(After saving, check that the current value now
shows the new selection).
4. Touch the back button to return to “Adjust a setting...” screen.
NOTE - If the defaults for the settings are shown in red, you are not required
to make any changes, but you must go into the edit tool, and touch save.
When all red text is gone, the back button will appear; touch it to return to the
“Adjust a setting...” screen.
HUMIDIFICATION SETTINGS — FEATURE SCREEN
1. From the Main Screen, touch the right arrow icon to go the the
Features screen.
2. From the Features screen, select system settings.
3. Touch the button for the humidification settings you want to adjust; if
it says humidifier OFF, one touch will display a selection for ON.
4. When you touch the set-to button, the arrows appear, allowing you to
change to the desired humidity percentage setting.
SYSTEM SETTINGS
current indoor humidity is 50%
humidifier
is ON
de-
humidifier
MEDIUM
40%
set to 50%
set to
ALL CHANGES MADE ON
THIS SCREEN ARE IN
STANTLY SAVED.
9:39 am Aug 15, 2012 ?
Wi-Fi
OFF
MEDIUM
HIGH
humidity
display
is ON
humidification
settings
dehumidification
settings
Figure 6. Humidification Setting
DEHUMIDIFICATION SETTINGS — SYSTEM DEVICES SCREEN
Pre-adjustment REQUIREMENTS
First the device has been installed
Second, from the “Add or Remove Non-communicating equipment?”,
touch next.
Third, in the “Adjust a setting...” screen, configure the device as
follows:
1. In the “system devices” list, use the arrows to highlight System. Touch
edit.
2. Use arrows to highlight Min Dehumidification Setpoint; touch edit.
Note the current value (e.g. 40).
3. Use arrows to make changes; touch (After saving, check that the
current value now shows the new selection).
4. Touch the back button to return to “Adjust a setting...” screen.
DEHUMIDIFICATION SETTINGS — FEATURE SCREEN
1. From the Main Screen, touch the right arrow icon to go the the
Features screen.
2. From the Features screen, select system settings.
3. Touch the button of the dehumidification settings you want to adjust;
if it says de-humidifier OFF, one touch will display a selection for OFF,
MEDIUM or HIGH.

12
4. Selecting MEDIUM or HIGH will bring on the set-to button.
5. When you touch the set-to button, the arrows appear, allowing you to
change to the desired de-humidifier percentage setting.
SYSTEM SETTINGS
current indoor humidity is 50%
humidifier
is ON
de-
humidifier
MEDIUM
40%
set to 50%
set to
ALL CHANGES MADE ON
THIS SCREEN ARE IN
STANTLY SAVED.
9:39 am Aug 15, 2012 ? Wi-Fi
OFF
MEDIUM
HIGH
humidity
display
is ON
(default is ON)
humidification
settings
dehumidification
settings
Figure 7. Humidifier Controls
HOW DEHUMIDIFICATION MODE WORK — NO EXTERNAL
DEHUMIDIFICATION DEVICE
NOTE - OFF, MEDIUM and HIGH dehumidification modes are also a function of
the HVAC system with NO external dehumidification devices installed.
In OFF mode, dehumidification if off.
In MEDIUM mode, dehumidification occurs if these conditions are met and
signals are present at specific terminals:
 dehumidification has been enabled on installer settings, and
 the unit is in COOL mode, and
 dehumidification demand exists (RH above setpoint), and
 cooling demand exists (Y1 energized).
In HIGH mode, dehumidification occurs if all BASIC conditions are true, except
cooling demand may or may not be present. Also note that:
Maximum overcool from cooling setpoint is 2ºF.
Deadband temperature is limited to a minimum of 5ºF (instead of 3ºF
in DRY or MODERATE modes) because of 2ºF overcooling.
Using the Tests / Diagnostics Features
TO SELECT TESTS TO RUN
Use the following procedure to run test for various heating and cooling stage
operations.
1. Select a specific tests (1) to run or use the select all (2) button to run
all configurations. Use the deselect all (3) button to un-check desired
test.
2. Touch the start button (4) to run all selected tests or touch skip tests
(5) to end the test procedure.
3. After the tests are completed or you have selected skip test select the
exit button to end.
Blower
HP Heat - 1st Stage
HP Heat - 2nd Stage
Defrost Now
Cooling - 1st Stage
Cooling - 2nd Stage
Gas Heat - 1st Stage
Gas Heat - 2nd Stage
select all
select test to run
deselect all
skip tests
start
Only appears
if test item is
selected
Ö12
3
4
5
Figure 8. Selecting Tests

Comfort Sync 7-Day Programmable Communicating Thermostat
13
NOTE - Test mode lasts for 30 minutes (with the temperature updating every
30 seconds) except for the defrost test, which lasts 30 seconds. Tests
feature provides the technician time to manually verify the equipment
operation.
The tests feature is available after setup has been completed once. After
you touch next in the final setup screen, the “select tests to run” screen
(figure 8) will appear. (If you want you may skip tests; touch skip tests.)
To run all of the tests, touch select all. All boxes in the list of tests will be
checked. Or, touch box(es) next to test(s) to run certain tests.
After the tests have been started, the screen will describe which test is
running and shows a diagnostic summary of each test (see figure 9). After
reviewing the results and concluding that no further tests are needed, touch
next to proceed to next test. The technician must verify that the test
procedure is producing the desired result at the equipment.
After pressing next after the final test, the Testing finished screen will
appear (figure 10). At this point, use the EXIT button (if you have completed
the required setup), or use diagnostics button (to analyze the system), or
use equipment button (if you wish to make any changes to device details).
9:39 am Aug 15, 2012
Heating Rate
Blower CFM Demand
Blower Off Delay
Blower On Delay
Indoor Blower RPM
Indoor Blower Power
Flame Current
Flame Sense
Outdoor Temperature
current test: Blower
Check Blower Operation
%
1400CFM
Off
Off
0
0.0000%
0.000mA
No Flame
63ºF
nextcancel
setup tests equipment alerts diagnostics
Figure 9. Typical Tests Results Screens
9:39 am Aug 15, 2012 next
cancel
setup tests equipment alerts diagnostics
press 'EXIT' button to start normal operation
The Testing Process is finished
press 'tests' button to run more tests
Figure 10. Testing Finished Screen

14
Touch confirm to continue system configuration; the screen will change to
the system discovery screen. At this point, the program goes through the
same setup as the initial setup process which begins on page 3.
NOTE - “Compatible device found” screen (shown below) appears only
when a device has been removed and replaced with a compatible device.
Missing
Device Equipment Type No.
Model No. (control model no.)
Serial No. (control serial no.)
Found Compatible
Device Equipment Type No.
Model No. (control model no.)
Serial No. (control serial no.)
Settings were not copied
HOMEOWNER SERVICE ALERT CODES
Number Value Number Value
3000 Filter 1 3002 Humidifier Pad
3001 Filter 2 3003 UV Light
3004 Maintenance 4000 User Wi-Fi state change,
disable
4001 Firmware down
load failed
4002 Image file download failed
Alert Codes
The following tables list all alert codes used for troubleshooting system
components.
Table 1. Alert Codes and Troubleshooting
Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in
the Installer alert button. Minor and Moderate alerts are found only in the Installer alert
button.
Alert
Code Priority Alert Text Steps to clear
10 Critical (Thermostat) The thermostat has found an
unknown device on the system.
An unknown device is seen on the subnet in or outside of configuration mode. Clear by
reconfiguring the system. Touch the setup tab, touch start, and touch confirm. If problem
persists, then check all DEVICE connections to make sure they are Comfort Synccom
patible.
11 Critical (Thermostat) The thermostat cannot find a
previously installed unit.
Check all connections and cycle system power. If problem persists, clear by reconfiguring
the system. Press the setup tab, touch start, and touch confirm. If problem persists, then
check all DEVICE connections to make sure they are Comfort Synccompatible.
12 Critical (Thermostat) The thermostat cannot find an
Comfort Syncenabled indoor unit.
Thermostat did not find an Indoor Unit. Make sure there is an Comfort Sync indoor unit
on the system. Check R, i+, i and C connections, ohm wires and cycle power. Replace
indoor unit control board if there is no response.
14 Critical
(Thermostat) The thermostat found more
than one thermostat, more than one indoor
unit, or more than one outdoor unit on the
system.
Check wiring and remove duplicate equipment. Reconfigure system.
18 Minor
(Thermostat) The outside temperature is be
low the level where the heat pump is pro
grammed to heat the home. The system will
not use the heat pump to warm your home.
Notification only  Outdoor Temp is below the Low Balance Point. Heat Pump will not be
used to service a heating demand.

Comfort Sync 7-Day Programmable Communicating Thermostat
15
Table 1. Alert Codes and Troubleshooting
Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in
the Installer alert button. Minor and Moderate alerts are found only in the Installer alert
button.
Alert
Code Steps to clearAlert TextPriority
19 Minor
(Thermostat) The outside temperature is
higher than the level where the furnace or
electric heat is programmed to work. The
system will only use the heat pump to warm
your home.
Notification only  Outdoor Temp is above the High Balance Point. Indoor Unit (furnace or
airhandler) will not be used to service a heating demand.
29 Critical
(Thermostat) The thermostat is reading an
indoor temperature that is higher than 99ºF.
The thermostat will not allow any heating op
eration to begin until it senses a temperature
lower than 99ºF.
Indoor temperature rose above 99ºF during a heating or cooling demand. Heating opera
tion 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.
30 Moderate
(Thermostat) The thermostat is reading an
indoor temperature that is lower than 40ºF.
The thermostat will not allow any cooling op
eration to begin until it senses a temperature
higher than 40ºF.
Indoor Temp fell below 40ºF. Cooling operation is not allowed. Check to ensure that cool
ing equipment is not stuck ON. Check accuracy of the thermostat temperature sensor.
Select heating system mode to heat the indoor space to above 40ºF.
31 Critical
(Thermostat) The thermostat has lost com
munication with the (furnace, airhandler or
outdoor unit) for more than 3 minutes.
[Indicated unit] has not communicated with thermostat for more than 3 minutes. Check
connections. Ohm wires. If fault persists, then cycle power. Fault clears after communica
tion is restored.
32 Moderate (Thermostat) The (furnace, airhandler or
outdoor unit) is resetting itself.
[Indicated unit] is resetting itself. This event may occur during a power outage or power
fluctuation in the system. If persistent or if it coincides with the system operation then
proceed with the following steps. Check the power connections, check the amp draw at
the transformer (the transformer maybe overloaded) and check 24VAC voltage at the
DEVICE. The alarm is only cleared by pressing the clear button on the Installer Alerts Tab.
If the fault persists after checking the connections, replace the unit's control board.
34 Critical
(Thermostat) The thermostat does not know
the capacity (tonnage) of the (furnace,
airhandler or outdoor unit). Please program
the correct capacity of the (furnace,
airhandler or outdoor unit).
[Indicated unit] is missing the programmed unit capacity. Go to [Indicated unit] and pro
gram the unit capacity manually. See the unit IOM for programming instructions. Remove
power to thermostat before programming the unit control board. Once programming is
complete, reconnect thermostat wires and reconfigure system.

16
Table 1. Alert Codes and Troubleshooting
Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in
the Installer alert button. Minor and Moderate alerts are found only in the Installer alert
button.
Alert
Code Steps to clearAlert TextPriority
36 Critical
(Thermostat) 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.
Check for other alarms/codes that may be preventing the system from operating as ex
pected.
Step 1: Check all heating equipment to determine cause of heating demand.
Step 2: Recycle power.
System will clear code when it detects condition has cleared.
37 Critical
(Thermostat) 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.
Check for other alarms/codes that may be preventing the system from operating as ex
pected.
Step 1: Check all cooling equipment to determine cause of cooling demand.
Step 2: Recycle power.
System will clear code when it detects condition has cleared.
38 Critical
(Thermostat) The system has not been able
to turn on the heating for more than 45
minutes. The system will go offline for 60
minutes and try again.
Run the system in diagnostic mode and verify that it matches actual equipment operation.
Check for other alarms/codes that may be preventing the system from operating as ex
pected.
Step 1: Check all heating equipment to determine cause.
Step 2: Recycle power.
System will clear code when it detects condition has cleared.
39 Critical
(Thermostat) The system has not been able
to turn on the cooling for more than 45
minutes. The system will go offline for 60
minutes and try again.
Run the system in diagnostic mode and verify that it matches actual equipment operation.
Check for other alarms/codes that may be preventing the system from operating as ex
pected.
Step 1: Check all cooling equipment to determine cause.
Step 2: Recycle power.
System will clear code when it detects condition has cleared.
105 Critical
(Thermostat / Furnace / Air Handler / Out
door Unit) The (Thermostat, furnace,
airhandler or outdoor unit) has lost commu
nication with the rest of the system.
Equipment is unable to communicate. This may indicate the existence of other alarms/
codes. In most cases errors are related to electrical noise. Make sure high voltage power
is separated from RSBus. Check for incorrectly wired and/or loose connections between
the Thermostat, indoor unit and outdoor unit. Check for a high voltage source of noise
close to the system. Generally, this is a selfrecoverable error.
110 Critical (Furnace) The line voltage is too low. This alarm/code may appear during a brownout. Line voltage is below its designed operat
ing value. Check and correct the power line voltage.

Comfort Sync 7-Day Programmable Communicating Thermostat
17
Table 1. Alert Codes and Troubleshooting
Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in
the Installer alert button. Minor and Moderate alerts are found only in the Installer alert
button.
Alert
Code Steps to clearAlert TextPriority
111 Critical (Furnace) The line power voltage wiring is
reversed.
The unit is reporting that its power line and neutral are reversed. Turn off the power to the
system and correct the line power voltage wiring. System resumes normal operation 5
seconds after fault recovered.
112 Critical
(Furnace) The reporting device cannot find
earth ground. The thermostat will shut down
the system.
Provide proper earth ground to the equipment. System resumes normal operation 5
seconds after fault recovered.
113 Critical (Furnace) The line voltage is too high. Line voltage high (voltage higher than nameplate rating). Provide power voltage within
proper range. System resumes normal operation 5 seconds after fault recovered.
114 Critical
(Furnace / Air Handler) There is a fre
quency/distortion problem with the power to
the (furnace or airhandler).
This alarm/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 resumes normal operation 5
seconds after fault recovered.
115 Critical
(Furnace / Air Handler) The 24VAC to the
(furnace or airhandler control board) is
lower than the required range of 18 to
30VAC.
24Volt Power Low (Range is 18 to 30 volts). Check and correct voltage. Check for addi
tional powerrobbing equipment connected to system. This alarm/code may require the
installation of an additional or larger VA transformer.
117 Minor (Furnace) The reporting unit has poor earth
grounding.
Provide proper grounding for the unit. Check for proper earth ground to the system. The
alarm/code will clear 30 seconds after it is corrected.
120 Moderate
(Thermostat / Furnace / Air Handler / Out
door Unit) There is a delay in the (Thermo
stat, furnace, airhandler or outdoor unit) re
sponding to the system.
Typically, this alarm/code does not cause any issues and will clear on its own. The alarm/
code is usually caused by a delay in the outdoor unit responding to the thermostat. Check
all wiring connections. Cleared after unresponsive device responds to any inquiry.
124 Critical
(Thermostat / Furnace / Air Handler / Out
door Unit) The thermostat has lost commu
nication with the (furnace, airhandler or out
door unit) for more than 3 minutes.
Equipment lost communication with the thermostat. Check the wiring connections, ohm
wires and cycle power. The alarm stops all associated HVAC operations and waits for a
heartbeat message from the unit that's not communicating. The alarm/fault clears after
communication is reestablished.
125 Critical
(Thermostat / Furnace / Outdoor Unit) There
is a hardware problem on either the (Ther
mostat, furnace control board, airhandler
control board or outdoor unit control board).
There is a control hardware problem. Replace the control if the problem prevents opera
tion and is persistent. The alarm/fault is cleared 300 seconds after the fault recovers.
126 Critical
(Furnace / Outdoor Unit) There is an internal
communication problem with the (furnace
control board, airhandler control board or
outdoor unit control board).
There is an internal hardware problem on the control. Typically the control will reset itself.
Replace the control if the problem prevents operation and is persistent. The alarm/fault is
cleared 300 seconds after the fault recovers.

18
Table 1. Alert Codes and Troubleshooting
Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in
the Installer alert button. Minor and Moderate alerts are found only in the Installer alert
button.
Alert
Code Steps to clearAlert TextPriority
130 Moderate (Air Handler) An airhandler configuration
jumper is missing.
Configuration jumper(s) missing on control (applicable in noncommunicating applications
only). Replace the jumper or put wire between terminals on control. Cleared after jumper is
connected.
131 Critical The (Thermostat, furnace, airhandler or out
door unit) control parameters are corrupted. Reconfigure the system. Replace the control if heating or cooling is not available.
132 Critical (Air Handler) The device's control software
is corrupted.
Recycle power. If failure reoccurs, replace the control. System reset is required to recov
er.
180 Critical
(Furnace / Air Handler / Outdoor Unit) The
thermostat has found a problem with the
(furnace, airhandler or outdoor unit) outdoor
sensor.
In normal operation after control recognizes sensors, the alarm will be sent if valid temper
ature reading is lost. Compare outdoor sensor resistance to temperature/resistance charts
in unit installation instructions. Replace sensor pack if necessary. At the beginning of (any)
configuration, 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
'About' screen. The alarm/fault will clear upon configuration, or sensing normal values.
200 Critical (Furnace) The furnace roll out limit switch is
open.
Correct the cause of roll out trip. Reset roll out switch. Reset power to clear. Test the fur
nace operation. The alarm/fault clears after the furnace roll out switch is closed.
201 Critical
(Furnace / Air Handler) The system has lost
communication with the (furnace or airhand
ler) indoor blower motor.
Lost communication with indoor blower motor. Possible causes include: power outage,
brownout, motor not powered, loose wiring, condensation on air handler control without
cover on breaker. Problem may be on control or motor side. Cleared after communication
is restored.
202 Critical
(Furnace / Air Handler) The unit size code
for the (furnace or airhandler) and the size
of blower motor do not match.
Incorrect appliance unit size code selected. Check for proper configuring under Unit Size
Codes for Furnace/Air Handler on configuration guide or in installation instructions. The
alarm/fault clears after the correct match is detected following a reset. Remove the ther
mostat from the system while applying power and reprogramming.
203 Critical
(Furnace / Air Handler) The unit size code
for the (furnace or airhandler) has not been
selected.
No appliance unit size code selected. Check for proper configuring under: Unit Size Codes
for Furnace/Air Handler on configuration guide or in installation instructions. Critical Alert.
The alarm/fault clears after the correct match is detected following a reset. Remove the
thermostat from the system while applying power and reprogramming.
204 Critical (Furnace) There is a problem with the fur
nace gas valve. Check gas valve operation and wiring. The alarm/fault clears after the issue is corrected.
205 Critical (Furnace) The furnace gas valve relay con
tact is closed. Check wiring on control and gas valve. The alarm/fault clears after the issue is corrected.
206 Critical (Furnace) The furnace gas valve 2nd stage
relay is faulty.
Furnace will operate on 1st stage for the remainder of the heating demand. The alarm/fault
will clear after the issue is corrected. If unable to operate 2nd stage, replace control.

Comfort Sync 7-Day Programmable Communicating Thermostat
19
Table 1. Alert Codes and Troubleshooting
Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in
the Installer alert button. Minor and Moderate alerts are found only in the Installer alert
button.
Alert
Code Steps to clearAlert TextPriority
207 Critical (Furnace) The furnace hot surface igniter is
open.
Measure the resistance of hot surface igniter. Replace the it if it is not within the specified
range found in IOM. The alarm/fault clears after the issue is corrected.
223 Critical (Furnace) The furnace low pressure switch
is open.
Check pressure (inches w.c.) of low pressure switch closing during a heat call. Measure
operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct
operation and restriction. The alarm/fault clears after the issue is corrected.
224 Critical (Furnace) 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 and
combustion air inducer for correct operation and restriction. The alarm/fault clears after the
issue is corrected.
225 Critical (Furnace) The furnace high pressure switch
is failing to close.
Check pressure (inches w.c.) of high pressure switch closing during a heat call. Measure
operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct
operation and restriction. The alarm/fault clears after the issue is corrected.
226 Critical (Furnace) The furnace high pressure switch
is stuck closed.
Check operation of high pressure switch closing during a heat call. Measure operating
pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and
restriction. The alarm/fault clears after the issue is corrected.
227 Moderate (Furnace) The furnace low pressure switch
is open 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 and combustion air inducer for correct
operation and restriction. The alarm/fault clears after the issue is corrected.
228 Moderate (Furnace) The furnace control is not able to
calibrate the pressure switch.
Unable to perform pressure switch calibration. Check vent system and pressure
switch wiring connections. Check the drain trap for blockage. The alarm/fault clears after a
successful calibration.
229 Minor
(Furnace) The furnace control has switched
to high fire ignition because the low fire pres
sure switch did not close in the allowed time.
IFC switched to high fire ignition because low fire pressure switch did not close in allowed
time. No action is needed.
240 Moderate (Furnace) The furnace flame current is low.
Check microamperes of the flame sensor using thermostat diagnostics. Clean or replace
the flame sensor. Measure voltage of neutral to ground to ensure good unit ground. The
alarm clears after a proper microamp reading has been sensed.
241 Critical (Furnace) The furnace flame is going out
while the furnace is heating.
Shut off gas. Check for a gas valve leak. Replace the gas valve if needed. The alarm/fault
will clear when a heat call ends successfully.
250 Moderate (Furnace) The furnace primary limit switch is
open.
Check for proper firing rate on furnace. Ensure there is no blockage in the furnace and the
duct work. Check for proper air flow. If limit switch is not closed within 3 minutes, the unit
will go into 1hour Watchguard mode. The alarm/fault will clear when a heat call ends
successfully.

20
Table 1. Alert Codes and Troubleshooting
Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in
the Installer alert button. Minor and Moderate alerts are found only in the Installer alert
button.
Alert
Code Steps to clearAlert TextPriority
252 Moderate (Furnace) The furnace discharge airtemper
ature is high.
Check temperature rise, air flow and input rate. Check for dirty filters. The alarm/fault will
clear when a heat call ends successfully.
270 Critical
(Furnace) The furnace is in Watchguard
mode. The furnace igniter cannot turn on the
flame.
Check for proper gas flow. Ensure that igniter is lighting burner. Check flame sensor cur
rent. Check for dirty filters. The alarm/fault will clear on successful ignition.
271 Critical
(Furnace) The furnace is in Watchguard
mode. The furnace low pressure switch is
open.
Check pressure (inches w.c.) of low pressure switch closing during a heat call. Measure
operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct
operation and restriction. The alarm/fault will clear on successful ignition.
272 Critical
(Furnace) The furnace is in Watchguard
mode. The furnace low pressure switch is
open during run mode.
Check operation of low pressure switch to see if it is stuck open during a heat call. Meas
ure operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct
operation and restriction. The alarm/fault will clear when a heat call ends successfully.
273 Critical
(Furnace) The furnace is in Watchguard
mode. The furnace flame is going off during
a heating cycle.
Check microamperes of flame sensor using thermostat diagnostics. Clean or replace
sensor. Measure voltage of neutral to ground to ensure good unit ground. The alarm/fault
will clear when a heat call ends successfully.
274 Critical (Furnace) The furnace limit switch has been
open for more than 3 minutes.
The system will go into Watchguard mode. Check firing rate and air flow. Check for block
age. The alarm/fault will clear when a heat call ends successfully.
275 Critical (Furnace) The furnace flame is out of se
quence.
The system will go into Watchguard mode. Shut off gas. Check for gas valve leak. The
alarm/fault will clear on next successful ignition.
276 Critical
(Furnace) The furnace is not able to calib
rate or the high pressure switch opened or
failed to close in run mode.
The system will go into Watchguard mode. Check vent system and pressure
switch wiring connections. The fault/alarm will clear when the furnace calibrates itself
successfully.
290 Critical (Furnace) There is a problem with the fur
nace ignition circuit.
The system will go into Watchguard mode. Measure resistance of hot surface igniter.
Replace the hot surface ignitor it is not within specifications. The alarm/fault will clear on
next successful ignition.
291 Critical (Furnace) The heating airflow is below the
minimum required level.
The system will go into Watchguard mode. Check for dirty filters and other air flow restric
tions. Check blower performance. The alarm/fault will clear when a heat call ends suc
cessfully.
292 Critical
(Furnace / Air Handler) The (furnace or
airhandler) indoor 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, obstruction etc. Replace motor or wheel if as
sembly does not operate or meet performance standards. The alarm/fault clears after the
indoor blower motor starts successfully.