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INSTALLER’S SYSTEM SETUP  
GUIDE  
2012 Lennox Industries Inc.  
Dallas, Texas, USA  
icomfort Wi-FiThermostat  
Touch Screen Programmable Communicating Thermostat  
CONTROLS  
away  
mode  
506920−01  
09/12  
Supersedes 05/12  
outdoor  
temperature  
indoor temperature  
set temp  
heat  
or  
cool  
80  
75  
cool−to  
icomfort−Enabled Units  
fan is  
AUTO  
72  
AOUFTFO  
heat to  
G71MPP−03 or later  
SLP98−01 or later  
SL280−03 or later  
XC17−02 or later  
XP17−02 or later  
XP19−06 or later  
XC21−05 or later  
XP21−01 or later  
indoor humidity is 41%  
system is cooling  
EL296V−01 or later  
CBX40UHV02 or later  
CBX32MV−06 or later  
9:39 am Aug 15, 2012  
Wi−Fi  
Shipping and Packing List  
THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER  
FOR FUTURE REFERENCE  
1 − icomfort Wi-Fithermostat  
4 − Mounting Screws  
4 − Wall Anchors  
1 − Installation Quick-Start Guide  
1 − Installer’s System Setup Guide  
1 − Homeowner’s Manual  
1 − Warranty card  
NOTICE  
Read this manual before programming this thermostat.  
Use this thermostat only as described in this manual.  
09/12  
506920−01  
*2P0912*  
*P506920-01*  
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Thermostat wire termination in communicating system . . . . . . . . . . . . . . . . 63  
Table of Contents  
Page  
Technical Description/Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Change settings (dealer info, daylight savings, fan circulate) . . . . . . . . . . .  
Table 1. System settings defaults and ranges . . . . . . . . . . . . . . . . . . . . . . .  
Add or Remove Non−communicating equipment . . . . . . . . . . . . . . . . . .  
Setting up typical icomfortsystems  
Indoor Unit  
Outdoor Unit  
icomfort enabled AC  
non−communicating AC  
icomfort enabled HP  
non−communicating HP  
icomfort enabled AC  
non−communicating AC  
icomfort enabled HP  
non−communicating HP  
page  
icomfort−enabled  
furnace  
icomfort−enabled  
furnace (dual fuel)  
Configure Dehumidifier (Humiditrol®/Aux. Dehum. installed) . . . . . . . . 16  
Configure Dehumidification (no dehumidifier installed) . . . . . . . . . . . . . . 17  
Humidification and Dehumidification Modesꢀhow they work . . . . . . . . . . . 18  
Register the icomfort Wi-Fithermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26  
Personal Computer account registration to icomfort Wi-Fiserver . . . . . . 26  
PC Welcome screen, interactive demo, Gelaskins . . . . . . . . . . . . . . . . . . . . 27  
Access Installer Program from User Home Screen . . . . . . . . . . . . . . . . . . . 28  
Heat Pump, Dual Fuel and Balance Points . . . . . . . . . . . . . . . . . . . . . . . . . . 32  
Table 2. Variable Capacity Furnace Operation . . . . . . . . . . . . . . . . . . . . . . . 35  
Table 3. Adjustable Parameters (Installer) . . . . . . . . . . . . . . . . . . . . . . . . . . . 37  
Table 5. Alert Codes and Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 45  
not supported  
icomfort−enabled  
air handler  
icomfort−enabled  
air handler  
CAUTION  
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.  
WARNING  
Electric shock hazard.  
Always turn off power at the main power source by switching the circuit  
breaker to the OFF position before installing or removing this thermostat.  
All wiring must conform to local and national building and electrical  
codes and ordinances.  
506920−01 09/12  
Page 2  
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icomfortWi-FiThermostat − Technical Description and Features  
cating, color display touchscreen, 7−day programmable thermostat. It stores  
system parameters and settings in nonvolatile memory (i.e., it retains data  
when electrical power fails or is turned off). It is designed for 4−wire connec-  
BEST PRACTICES! Keep all communication wiring as far away from house  
electrical wiring and large electrical appliances as possible (15’ [5m] recom-  
mended).  
The thermostat also:  
supports three languages (English, French, Spanish),  
supports air conditioning units 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, 2 stages of emergency  
heating),  
The icomfortWi-Fithermostat can connect to online services via the inter-  
net through the homeowner’s Wi−Fi access point. After online registration is  
completed, the system may then be accessed by the homeowner from any-  
where using a remote internet connection via computer or personal commu-  
nicating device.  
supports Indoor Air Quality with time-based notification of consum-  
ables including media filters, UVC bulbs, humidifier pads, and Pure-  
Airsystem catalyst service / replacement,  
supports variable−capacity / multi−stage heat/cool, universal compati-  
bility (gas/electric/heat pump/ac), and is dual fuel capable (icomfort−  
enabled HP only) with two balance points.  
Thermostat  
connections  
R
i+ i− C  
Important  
Connections to non−communicating outdoor units and accessories are de-  
scribed in the Quick−Start Installation guide. (Wiring diagrams are also  
Maximum total length of all  
connections on the RSBus is  
limited to 1500 ft. (450 m).  
Max. length between compo-  
nents is 300 ft. (90 m).  
Supports  
RSBus  
Humidification Measurement and Control,  
Dew Point Adjustment Control  
Dehumidification Measurement and Control  
Humiditrol Enhanced Dehumidification Accessory (EDA)  
Multi-Stage HVAC Systems  
Minimum wire  
size is 18 gauge  
®
icomfort−enabled Furnace Control  
icomfort−enabled Air Handler Control  
icomfort−enabled Outdoor Unit Control  
Note: icomfort  
Wi-Fithermo-  
stat does not  
require  
Equipment Maintenance Reminders  
AutochangeoverMode −− Permits control of heating, cooling, humidifi-  
cation, and dehumidification without user involvement.  
External Sensors − outdoor temperature, discharge air  
Humidify Control  
shielded cable  
wiring.  
Outdoor Temperature Sensor (option)  
Dehumidify Control  
Figure 1. icomfort by Lennoxsystem  
Communicating outdoor units contain a built−in outdoor temperature sensor.  
icomfort Wi-Fi7−Day Programmable Communicating Thermostat  
Page 3  
 
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Installation and Setup  
IMPORTANT! Make sure the router is capable of, and set to operate in  
wireless network ꢀb" mode. Check router utility program or contact  
service provider for help. When determining the location for the Wi−Fi ther-  
mostat, be sure it is in an area near enough to the homeowner’s Wi−Fi router  
to ensure good communications signal between the thermostat and the rout-  
er. (Hint: use a smart phone with Wi−Fi to find and determine signal  
strength.)  
ꢁSystem settingsꢁ (figure 2) appear first. As you use the up/down arrows to  
scroll through the settings, the right hand side will show the current value.  
For example, current value: 9:39 am Aug 15, 2012 shows the current date  
for Time and Date.  
To adjust a setting, highlight it, then  
press edit  
system settings  
Time and Date  
Refer to the Quick Start Guide for information about installing the thermostat  
on a wall and for wiring diagrams for field wiring the thermostat to the system  
using one of a number of possible configurations. (Wiring diagrams are also  
current value:  
Daylight Saving Time  
Circulate Fan ON Time  
System Name  
9:39 am Aug 15, 2012  
NOTE − If electric heat strips are used with an icomfortt−enabled air handler,  
the strips MUST be configured on the air handler control (AHC) board before  
beginning the ꢀdiscovery" sequence below.  
Dealer Number  
Dealer Name  
edit  
Dealer Address  
Dealer Phone  
After all wiring connections are made, apply power to the system. 24VAC will  
power up the thermostat.  
Dealer Email  
back  
After power is applied to the thermostat for the  
first time, the processor checks the system for  
installed communicating devices, the ꢁSo Sim-  
ple. So Smart. So Comfortable" screen dis-  
plays; followed by ꢁUse this thermostat?"  
screen. Touch press here to continue. During  
next  
Dealer Website  
9:39 am Aug 15, 2012  
Figure 2. ꢀSystem settings" screen  
(Thermostat 1)  
Use this Thermostat?  
the setup process, alerts may pop open to provi-  
de the installer with information that affects the  
press here  
setup. Correct the cause of any such alerts  
prior to continuing setup.  
506920−01 09/12  
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Change settings  
Circulate Fan ON Time Range  
is 15 to 50 %  
Default is 35, inc: 1  
up/down  
arrows  
If you want to change a setting, use one of the Settings change tools shown  
in figure 3. (Also, see Set time and date on Page 7.) After changes have  
been made, use save to store the changed data or cancel to exit the screen  
and return to the list of settings.  
set−to  
45%  
save  
cancel  
Dealer Number  
radio  
buttons  
Use the arrows to scroll to the Dealer Number setting. Press edit and use the  
typewriter tool (shown in figure 3) to enter your dealer number. Press save to  
store the identification.  
Outdoor Unit Type  
Select one  
Not Installed  
1 Stage A/C Unit  
1 Stage HP Unit  
2 Stage A/C Unit  
2 Stage HP Unit  
system settings  
To adjust a setting, highlight it, then  
press edit  
Time and Date  
Daylight Saving Time  
Circulate Fan ON Time  
System Name  
current value:  
save  
cancel  
Dealer Number  
Dealer Name  
keyboard  
tool  
Dealer Name  
edit  
Dealer Address  
Dealer Phone  
Dealer Email  
Dealer Website  
back  
next  
9:39 am Aug 15, 2012  
Figure 3. Settings change tools  
Figure 4. Entering ꢀDealer Number"  
icomfort Wi-Fi7−Day Programmable Communicating Thermostat  
Page 5  
 
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Circulate fan ON time setting  
Table 1. System setting defaults and range  
default  
system  
setting  
range/  
condition  
use  
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 circulation.  
Time and Date  
Enabled  
Daylight Saving  
Time  
ꢁ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 set-  
tings approximate how long the fan will run at these typical settings:  
Enabled/Disabled  
Circulate Fan  
ON Time  
15 to 50% (in 1%  
increments)  
35%  
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).  
(alpha−numeric  
characters)  
use keyboard  
tool to change  
System Name  
Dealer Number  
****  
Table 1 shows the range/condition and defaults for the system settings and  
indicates the tools used to make changes.  
Dealer Name  
Dealer Address  
Dealer Phone  
Dealer Email  
Lennox  
(alpha−numeric  
characters)  
use keyboard  
tool to change  
1−800−9−LENNOX  
Dealer Website  
506920−01 09/12  
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Set time and date  
Use the arrows to select Time and Date;press edit (see figure 5) to proceed  
When ꢁTime and Date" screen (figure 6) 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.  
To adjust a setting, highlight it, then  
press Edit  
system settings  
Press on the hour or minute; up down arrows appear to allow change.  
Touch the am/pm field to toggle it between am and pm.  
Time and Date  
current value:  
Daylight Saving Time  
9:39 am Aug 15, 2012  
Circulate Fan ON Time  
When the correct date and time is set, press save to save settings and  
return to previous settings screen.  
System Name  
Touch next to continue to next screen.  
Dealer Number  
edit  
Dealer Name  
Dealer Address  
Dealer Phone  
Dealer Email  
system settings  
January 2012  
S
1
M
2
T
3
W
4
T
5
F
6
S
7
back  
next  
Dealer Website  
09 : 39 am  
9:39 am Aug 15, 2012  
8
9
10 11 12 13 14  
15 16 17 18 19 20 21  
22 23 24 25 26 27 28  
29 30 31  
Figure 5. View/edit time and date  
save  
9:39 am Aug 15, 2012  
Figure 6. Set current time and date  
icomfort Wi-Fi7−Day Programmable Communicating Thermostat  
Page 7  
 
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Use ꢀabout" screen & access ꢀAdd or Remove Non−communicating equipment" screen  
The ꢁabout" screen shows details of discovered installed equipment.  
From the ꢁsystem devices" screen, use arrow buttons to scroll to a device; then press the about button. Use the up/down arrows to scroll through and view  
additional information about the selected device. When finished viewing, press the back button.  
Press next to advance to the ꢁAdd or Remove Non−communicating equipment?" screen.  
device feature list  
Language Support  
device description  
Equipment Type Name  
Furnace  
Unit Model Number  
Unit Serial Number  
Equipment Type Name  
Furnace  
system devices  
System  
press ’about’ for  
more information on  
a highlighted device  
Unit Nominal Capacity  
Number of Heating Stages  
Heating Capacity by Stage  
Indoor Blower CFM Range  
Control Software Revision  
Control Model Number  
about  
(returns to  
system  
devices  
screen)  
Heat Pump  
Furnace  
Thermostat  
back  
Add or Remove  
Non−communi-  
cating equip-  
ment?  
system devices  
System  
yes  
back  
next  
Heat Pump  
Furnace  
9:39 am Aug 15, 2012  
Thermostat  
If no, press Next  
Step.  
back  
next  
Figure 7. Using the ꢀabout" screen and accessing ꢀAdd or Remove Non−communicating equipment" screen  
506920−01 09/12  
Page 8  
 
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Add or Remove Non−communicating equipment  
Figure 7 (previous page) shows how to access the ꢁAdd or Remove Non−  
communicating equipment" screen.  
HUMIDITY CONTROL TIPS  
The standard humidification mode is ꢁBasic" (humidifier is energized  
during a call for heat, if there is a humidification demand).  
Sensed outdoor temperature, required for some features, is provided  
from one of the following sources:  
Adding Non−Communicating Outdoor unitSee figure 8 for details  
for adding/removing an outdoor unit.  
A
B
C
downloaded via Wi−Fi when available (primary source),  
sensor furnished with icomfort−enabled outdoor units,  
separate outdoor sensor connected to the furnace or air handler  
ꢁoutdoor sensor" connections.  
communicating humidifier which will be controlled by the icomfort Wi-Fiꢁ  
thermostat through the ꢁH" or ꢁHUM" terminals on the furnace or air handler.  
NOTE − If no source for outdoor temperature is present, ꢀBasic and  
Precision Dew Point Control" modes are not available.  
Adding DehumidifierꢀThe procedures in figure 10 describe adding a  
non−communicatingdehumidifier controlled by the icomfort Wi-Fithermo-  
stat through the ꢁDH" output on the furnace or air handler.  
If you do not have the ability to select or adjust the Humidity RH set-  
point on the ꢀIndoor Humidity" button, the control is set for ꢁDisplay  
Only." In the installer program, go the equipment button and select  
ꢁSystem" and press the edit button. Select ꢁHumidification Control  
Mode" and press edit. Choose ꢁBasic," ꢁPrecision," ꢁBasic Dew Point  
Control" or ꢁPrecision Dew Point Control" and press save.  
Adding non−communicating accessoriesꢀAdding maintenance  
timer reminders to accessories is a simple process of ꢁinstalling" the device,  
which effectively tells the thermostat to activate access to its service timers.  
NOTICE  
For details about how the humidification and dehumidification  
modes operate and how to configure those modes, see additional in-  
formation beginning on Page 18.  
Timers are available for two (2) filters, Humidifier pad, UV bulb maintenance  
and the PureAirAir Purification system.  
icomfort Wi-Fi7−Day Programmable Communicating Thermostat  
Page 9  
 
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Add Non−Communicating Outdoor unit  
To add (or remove) an outdoor unit that is not icomfort−enabled, you must be at  
the ꢁAdd or Remove Non−communicating equipment?" screen.  
1. Press the yes button on this screen (see 1).  
Add or Remove  
Non−communicating  
equipment?  
System Devices  
2. In the ꢁnon−communicating device list" screen, use the arrows (2a) to  
highlight Outdoor Unit Type and press edit (2b).  
yes  
System  
3. Touch one of the radio buttons (3a) to select a 1−or 2−Stage AC Unit or a  
1−or 2−Stage HP Unit; press save (3b).  
Furnace  
4. Use arrows (4a) to highlight any red colored text in the device list (e.g.  
select Outdoor Unit Capacity; text turns white). Press edit (4b).  
to add/remove/adjust a device,  
select it, then press edit  
5. Use arrows (5a) to make changes; press save (5b). Change other red  
settings (if present) using a similar process.  
non−communicating device list  
Outdoor Unit Type  
Humidifier  
NOTE − If the defaults are correct, you do not have to make any changes, but you  
must press save (5b). When all red text is gone, the back button will appear; press  
it to return to the ꢀAdd or Remove Non−communicating equipment?" screen (1).  
current value:  
Not Installed  
Dehumidifier  
edit  
Outdoor Unit Type  
Select one  
non−communicating device list  
to add/remove/adjust a device,  
select it, then press edit  
Not Installed  
1 Stage A/C Unit  
2 Stage A/C Unit  
2 Stage HP Unit  
1 Stage HP Unit  
Outdoor Unit Type  
current value:  
Outdoor Unit Capacity  
Outdoor Unit 1st Stage Capacity  
Humidifier  
2 Stage AC Unit  
Outdoor Unit Capacity  
Range is 18 to 60  
Default is 36, inc:1  
please view and save all  
red settings  
Dehumidifier  
edit  
save  
cancel  
set−to  
36  
save  
cancel  
back  
9:39 am Aug 15, 2012  
Figure 8. Add non−communicating deviceꢁOUTDOOR UNIT  
506920−01 09/12  
Page 10  
 
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Add (or Remove) Humidifier (skip if no humidifier is being used)  
NOTE − Adding humidity regulating non−communicating devices may be a 2−step procedure:  
1st, the device must be installed (this page; after the humidifier is installed, the operation  
mode defaults to ꢀBasic").  
Before adding a humidifier, be sure that:  
the humidifier is wired to the furnace or air handler control as shown on the Optional  
2nd, (if you want another mode, i.e. Precision, Basic Dew Point, or Precision Dew Point,  
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−communi-  
To add (or remove) a humidifier,:  
system devices  
1. Press the yes button on this screen (see 1).  
Add or Remove Non−  
communicating  
equipment?  
yes  
System  
2. In the ꢁnon−communicating device list" screen, use the arrows (2a) to highlight  
Humidifier (note the current value, Not Installed) and press edit (2b).  
Heat Pump  
non−communicating device list  
3. Touch one of the radio buttons (3a) to select the type of humidifier (or select Not  
Installed, if removing humidifier); press save (3b).  
to add/remove/adjust a device,  
select it, then press edit  
4. The previous screen returns, but the current value now shows your selection (4a).  
Press the back (4b) button.  
Humidifier  
current value:  
Dehumidifier  
5. The ꢁAdd or Remove..." screen reappears with your addition shown in the system  
devices list (5a). At this point, you may add more equipment (press yes) or if  
finished, press the next (5b) button to advance to the ꢁAdjust a setting..." screen  
Not Installed  
Electronic Air Cleaner  
Humidifier  
Select one  
edit  
6. (If you want other than the default ꢀBasic" mode of operation) Configure the  
Not Installed  
Bypass (24VAC) Humidifier  
Power (120VAC) Humidifier Bypass and Power Humidifier  
(available with furnace equipped systems only)  
system devices  
System  
Add or Remove Non−  
communicating  
equipment?  
yes  
save  
cancel  
Heat Pump  
to add/remove/adjust a device,  
select it, then press edit  
non−communicating device list  
Furnace  
Thermostat  
Humidifier  
current value:  
Bypass (24VAC) Humidifier  
Dehumidifier  
Bypass (24VAC) Humidifier  
Electronic Air Cleaner  
edit  
back  
next  
back  
9:39 am Aug 15, 2012  
Figure 9. Add or remove non−communicating deviceꢁHUMIDIFIER  
icomfort Wi-Fi7−Day Programmable Communicating Thermostat  
Page 11  
 
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®
Add (or Remove) Humiditrol or Auxiliary Dehumidifier (skip if no dehumidifying device is being used)  
NOTE − Adding humidity regulating non−communicating devices may be a 2−step procedure:  
1st, the device must be installed (this page; after the dehumidifier is installed, the opera-  
Before adding a dehumidifier, be sure that:  
the dehumidifier is wired to the furnace or air handler control as shown on the Option-  
tion mode defaults to ꢀBasic").  
®
2nd, set Humiditrol comfort adjust overcooling and the min/max dehumidification set-  
the entire system is wired, powered up, and the thermostat has detected the sys-  
tem’s installed communicating devices, and you are at the ꢁAdd or Remove Non−  
To add (or remove) a dehumidifier, you must be at the ꢁAdd or Remove Non−communicating  
equipment?" screen.  
Add or Remove  
Non−communicating  
equipment?  
system devices  
1. Press the yes button on this screen (see 1).  
yes  
2. In the ꢁnon−communicating device list" screen, use the arrows (2a) to highlight  
Dehumidifier and press edit (2b). Note the current value (e.g. Not Installed).  
System  
Furnace  
3. Touch one of the radio buttons (3a) to select the type of dehumidifier (or select Not  
Installed, if removing dehumidifier); press save (3b).  
to add/remove/adjust a device,  
select it, then press edit  
4. When you scroll to the Dehumidifier device (4a), (Note the current value, e.g.  
non−communicating device list  
Humidifier  
5. The ꢁAdd or Remove..." screen reappears with your addition shown in the system  
devices list (5a). At this point, you may add more equipment (press yes) or if  
finished, press the next button (5b) to advance to the ꢁAdjust a setting..." screen  
current value:  
Dehumidifier  
edit  
Not Installed  
Electronic Air Cleaner  
®
Dehumidifier  
Humiditrol NoteꢁBy default, the Humiditrol Comfort Adjust (HCA) is configured for maxi-  
mum overcooling and minimum dehumidification setpoint of 40% RH. If these settings are  
satisfactory, no further configuration is necessary. If another setting is needed, change HCA  
Select one  
Not Installed  
Humiditrol  
Auxiliary Dehumidifier  
save  
cancel  
system devices  
System  
Add or Remove Non−  
communicating  
equipment?  
yes  
to add/remove/adjust a device,  
select it, then press edit  
non−communicating device list  
Heat Pump  
Furnace  
Humidifier  
current value:  
Dehumidifier  
Thermostat  
Humiditrol  
Humiditrol  
Electronic Air Cleaner  
edit  
back  
back  
next  
Figure 10. Add or remove non−communicating deviceꢁDEHUMIDIFIER  
506920−01 09/12  
Page 12  
 
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Adjust a setting screen (communicating devices)  
Use arrows to select a device from the ꢁsystem devices" list; then use the about button to view information (shown on Page 8) about communicating  
devices (information about other devices is not available).  
Use resetAll button to un−install all non−communicating devices that were added through ꢁAdd or Remove..." screen and to reset any device settings made  
through this ꢁAdjust a setting..." screen to the factory defaults. (While editing a communicating device, the reset button is limited to only the selected device.  
You are asked to confirm (shown in figure 11) before resetting all.  
Use this screen to access communicating devices’ settings (pressing buttons numbered from 1 to 6 in figure 11 for an example of changing heating airflow;  
more examples are shown on the next page). Use back to return to the previous screen or next to go on. A complete list of parameters, their defaults and  
(if resetAll  
is pressed)  
To adjust a setting,  
highlight it, then press  
Edit  
system devices  
System  
about  
Furnace  
Furnace  
resetAll  
resetting a device to its factory default  
Thermostat  
(resetting ALL devices to their factory default)  
settings will cause the system to restart the  
setup process.  
1
2 Stage HP Unit  
Power (120VAC) Humidifier  
Humiditrol  
edit  
2
To continue, press CONFIRM or press CANCEL  
confirm  
cancel  
Low Heating Airflow  
current value:  
system devices  
Equipment Name  
Heating Airflow Control Type  
Low Heating Airflow  
325  
Low Heating Airflow  
Range is 325 to 450  
Default is 400, inc:25  
High Heating Airflow  
High Cooling Airflow  
Airflow Profile − Cooling  
High HP Airflow  
3
reset  
edit  
set−to  
5
325  
Continuous Indoor Blower Airflow  
4
save  
cancel  
6
back  
Figure 11. Adjust communicating device screens  
icomfort Wi-Fi7−Day Programmable Communicating Thermostat  
Page 13  
 
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Use the up/down arrows to scroll through the device’s settings. The current setting will be displayed on the right−hand side of the screen (figure 12). For  
example, current value: disabled. Press edit if you want to modify that setting, or press back to return to the previous screen.  
Available settings for the devices depend on the installed components. Shown below is an example of enabling and changing the balance point control from  
default (Disabled) to Enabled. After selecting Enabled, press save to save the changes and return to the previous screen.  
listed in red. Use the arrows to scroll and highlight each item appearing in red. Press edit, make any desired changes, and press save.  
When all affected settings have been edited/saved, the red message disappears. Press back to return to the ꢁTo adjust a setting..." screen.  
If no more adjustments are necessary, press next to advance to the ꢁselect tests to run" screen (see Page 19).  
System  
System  
Balance Point Control  
Balance Point Control  
Staged Delay Timers  
2nd Stage Delay  
Staged Delay Timers  
current value  
current value  
2nd Stage Delay  
3rd Stage Delay  
Disabled  
3rd Stage Delay  
Enabled  
Balance Point Control  
Lock In 2nd stage HP by Outdoor Temp  
Balance Point Control  
High Balance Point  
Balance Point Control  
edit  
please view and save all  
red settings  
edit  
Select one  
Disabled
Low Balance Point  
reset  
High Balance Point  
Range is −17 to 75  
Default is 0, inc:1  
Enabled  
Humiditrol Comfort Adjust  
Humidification Control Mode  
Min Dehumidification Setpoint  
back  
set−to  
save  
cancel  
50  
save  
cancel  
Figure 12. Accessing device to modify  
Figure 13. Modify device settings  
G71MPP or SLP98 Furnace Note:  
If your icomfort Wi-Fithermostat is being used with a G71MPP or SLP98 furnace and is set to variable−capacity mode of operation (the icomfortdefault  
with these units), the thermostat’s settings for stage timers are ignored (even if shown enabled in the thermostat). The stage timer will be used on the cooling  
side. The furnace software sets and controls the firing rates. The only other controlling factor is the stage temperature differentials. In Load−Tracking Variable  
Capacity (default for these furnaces), both stage timers and temperature differentials are ignored.  
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Adjust a setting... Configure Humidifier (skip if no humidifier is being used or if humidifier is being used and default  
ꢀBasic" humidification mode is desired)  
Pre−adjustment REQUIREMENTS:  
1st, the device has been installed (see Page 11).  
To adjust a setting, highlight it,  
then press Edit  
System Devices  
System  
Configure the device as follows:  
System  
Air Conditioner  
Furnace  
1. In the ꢁsystem devices" list, use the arrows (1a) to highlight System. Press edit (1b).  
about  
edit  
2. In the ꢁSystem" list, use the arrows (2a) to highlight Humidification Control Mode.  
The current value defaults to Basic mode. Press edit (2b).  
Thermostat  
3. Touch one of the radio buttons (3a) to select the mode of humidification control;  
press save (3b). (After saving, check that the current value now shows the new  
selection).  
Power (120VAC) Humidifier  
4. Use arrows (4a) to highlight any red colored text in the list (e.g. select Max Humidifi-  
cation Setpoint). Press edit (4b).  
System  
Humidification Control Mode  
2nd Stage Differential  
Staged Delay Timers  
5. Use arrows (5a) to make changes; press save (5b). Repeat for other red settings.  
You will not be able to advance to the next step until all red settings have been  
removed..  
current value:  
Basic  
edit  
2nd Stage Delay  
6. Press the back button to return to ꢁAdjust a setting..." screen.  
Dehumidification Control Mode  
Humidification Control Mode  
NOTE − If the defaults for the settings shown in red, you are not required to make any changes,  
but you must go into the edit tool, and press save (5b). When all red text is gone, the backbutton  
will appear; press it to return to the ꢀAdjust a setting..." screen.  
Humidification Control Mode  
Select one  
System  
Max Humidification Setpoint  
current value:  
Display Only  
Precision  
Basic  
1st Stage Differential  
2nd Stage Differential  
Basic Dew Point Co
Max Humidification Setpoint  
Range is 15 to 45  
Default is 45, inc:1  
Precision Dew Point  
45  
Staged Delay Timers  
2nd Stage Delay  
Dehumidification Control Mode  
Humidification Control Mode  
Max Humidification Setpoint  
OK/Humid Boundary  
edit  
set−to  
please view and save all  
red settings  
save 3b  
cancel  
45  
save  
reset  
cancel  
Outdoor Temperature Reading  
(returns to  
adjust a  
setting  
back  
screen)  
9:39 am Aug 15, 2012  
Figure 14. Adjust a non−communicating device settingꢁHUMIDIFIER  
icomfort Wi-Fi7−Day Programmable Communicating Thermostat  
Page 15  
 
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®
Adjust a setting... Configure Humiditrol or Auxiliary Dehumidifier  
Pre−adjustment REQUIREMENTS:  
1st, the device has been installed (see Page 12).  
To adjust a setting,  
highlight it,  
then press Edit  
system devices  
System  
about  
resetAll  
edit  
2nd, from the ꢀAdd or Remove Non−communicating equipment?", press next.  
3rd, in the ꢀAdjust a setting..." screen, configure the device as follows:  
Air Conditioner  
Furnace  
System  
1. In the ꢁsystem devices" list, use the arrows (1a) to highlight System. Press  
edit (1b).  
Thermostat  
Humiditrol  
®
2. Humiditrol onlyꢀIn the ꢁSystem" list, use the arrows (2a) to highlight  
Humiditrol Comfort Adjust. The current value defaults to Maximum Over-  
cooling. Press edit (2b).  
System  
Dehumidification Control Mode  
®
3. Humiditrol onlyTouch one of the radio buttons (3a) to select the over-  
cooling level; press save (3b). (After saving, check that the current value  
now shows the new selection).  
3rd Stage Delay  
current value:  
4th Stage Delay  
4. Use arrows (4a) to highlight Min Dehumidification Setpoint; press edit  
(4b). Note the current value (e.g. 45).  
Midpoint Overcooling  
Lock In 2nd Stage HP by Outdoor Temp  
Balance Point Control  
Humiditrol Comfort Adjust  
Min Dehumidification Setpoint  
reset  
edit  
5. Use arrows (5a) to make changes; press save (5b). (After saving, check  
that the current value now shows the new selection).  
6. Press the back button to return to ꢁAdjust a setting..." screen.  
Humiditrol Comfort Adjust  
Select one  
Maximum Overcooling  
Midpoint Overcooling  
Minimum Overcooling  
Dehumidification Control Mode  
current value:  
System  
Staged Delay TImers  
save  
can
2nd Stage Delay  
3rd Stage Delay  
4th Stage Delay  
45  
Min Dehumidification Setpoint  
Range is 40 to 60  
Default is 45, inc:1  
Humiditrol Comfort Adjust settings are  
only available on units equipped with  
a Humiditrol dehumidification device.  
Mid/Max overcooling.  
edit  
Lock In 2nd Stage HP by Outdoor Temp  
Balance Point Control  
set−to  
®
Humiditrol Comfort Adjust  
Min Dehumidification Setpoint  
OD/Humid Boundary  
reset  
42  
save  
cancel  
(returns to  
adjust a  
setting  
back  
Outdoor Temperature Reading Calibr  
screen)  
9:39 am Aug 15, 2012  
Figure 15. Adjust a non−communicating device settingꢁDEHUMIDIFIER  
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Adjust a setting... Configure Dehumidification (no dehumidifying device installed)  
(skip if default ꢀBasic" dehumidification mode is desired)  
Pre−adjustment REQUIREMENTS:  
1st, NO physical dehumidification device has been installed.  
2nd, configure the thermostat for dehumidification as follows:  
System Devices  
To adjust a setting, highlight it,  
then press Edit  
System  
Furnace  
1. In the ꢁsystem devices" list, use the arrows (1a) to highlight System.  
Press edit (1b).  
System  
about  
edit  
Thermostat  
2. In the ꢁSystem" list, use the arrows (2a) to highlight Dehumidification  
Control Mode. The current value defaults to Display Only. Press edit  
(2b).  
2 Stage AC Unit  
Power (120VAC) Humidifier  
3. Touch one of the radio buttons (3a) to select the mode of dehumidification  
control; press save (3b).  
4. Use arrows (4a) to highlight any red colored text in the list (e.g. select Min  
Dehumidification Setpoint). Press edit (4b).  
System  
Dehumidification Control Mode  
5. Use arrows (5a) to make changes; press save (5b). Change other red  
settings (e.g. Auto Changeover − Humidif. Deadband) using a similar  
process.  
2nd Stage Differential  
Staged Delay Timers  
current value:  
2nd Stage Delay  
Display Only  
6. Press the back button to return to ꢁAdjust a setting..." screen.  
Dehumidification Control Mode  
Humidification Control Mode  
OK/Humid Boundary  
NOTE − If the defaults are correct, you do not have to make any changes, but you  
must press save (5b). When all red text is gone, the back button will appear; press it  
to return to the ꢀAdd or Remove Non−communicating equipment?" screen.  
edit  
Outdoor Temperature Reading  
Dehumidification Control Mode  
current value:  
System  
Dehumidification Control Mode  
Staged Delay Timers  
Select one  
Balance Point Control  
Display Only  
Precision  
Basic  
Precision  
Min Dehumidification Setpoint  
Range is 40 to 60  
Default is 45, inc:1  
Dehumidification Control Mode  
Humidification Control Mode  
Auto Changeover − Humidif. Deadband  
Max Humidification Setpoint  
Min Dehumidification Setpoint  
OK/Humid Boundary  
edit  
set−to  
please view and save all  
red settings  
reset  
45  
save  
Outdoor Temperature Reading  
cancel  
save  
cancel  
back  
9:39 am Aug 15, 2012  
Figure 16. Adjust dehumidification when not using Humiditrol or an auxiliary dehumidifier  
icomfort Wi-Fi7−Day Programmable Communicating Thermostat  
Page 17  
 
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Humidification and Dehumidification Modesꢁhow they work  
HUMIDIFICATION modes  
In PRECISION 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.  
BASIC & PRECISIONꢀThese modes allow user control of RH between 15  
and 45%. These conditions must be met for either mode to operate:  
Deadband temperature is limited to a minimum of 5ºF (instead of 3ºF  
in BASIC or DISPLAY ONLY mode) because of 2ºF overcooling.  
humidification mode has been enabled, and  
the unit is in HEAT mode, and  
®
Humiditrol or Auxiliary Dehumidifier mode requires:  
humidification demand exists (24V present at H), and  
BASIC mode also requires presence of heating demand [Y for HP  
heat, or W for gas heat (W may be energized with G de−energized)].  
NOTE − Systems using icomfortt and a dehumidifier − ꢀDehum" jumper on  
furnace/air handler control does not need to be cut when using with a icom-  
fort Wi-Fit thermostat.  
Wi−Fi is operational or outdoor sensor is installed and set up  
dehumidification has been enabled on installer settings, and  
the unit is in COOL mode, (or if in AUTO, at least one thermostat cool-  
ing call made prior to the dehumidification demand), and  
a dehumidification demand exists (RH above setpoint), and  
outdoor temp. below 95°F; indoor temp. above 65°F, and  
DEW POINTꢀ(Available only if Wi−Fi is operational or outdoor sensor is at-  
tached)  
Basic Dew Point ControlꢀBasic Dew Point Control adjustment mode will  
change the humidification setpoint based on the outdoor temperature and a  
user−defined dew point adjustment setting.  
®
for HUMIDITROL, adjust Humiditrol comfort parameters as follows:  
MAX adj. − Indoor temp > 2°F above heating setpoint  
Precision Dew Point ControlꢀPrecision Dew Point Control adjustment  
mode will operate when these conditions are met:  
HEAT Setpoint+COOL Setpoint  
2
MID adj. − Indoor temp >  
humidification mode has been enabled, and  
the unit is in HEAT mode, and  
humidification demand exists (24V present at H).  
MIN adj. − Indoor temp > 2°F below cooling setpoint  
Auxiliary Dehumidifier (stand alone dehumidifier)  
When this option is selected, dehumidification will be allowed under the fol-  
lowing conditions, provided there is NO call for humidification:  
DEHUMIDIFICATION modes  
In the absence of heating or cooling calls, or  
Simultaneous with blower only calls.  
NOTE − Basic and Precision dehumidification modes are functions of the  
HVAC system with NO external dehumidification devices installed. Humidi-  
trol and Auxiliary Dehumidifiers do not use these modes.  
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  
InBASIC mode, dehumidification occurs if these conditions are met and sig-  
nals are present at specific terminals:  
dehumidification has been enabled on installer settings, and  
the unit is in COOL mode, and  
Auxiliary dehumidification is controlled by the thermostat dehumidification  
demand.  
dehumidification demand exists (RH above setpoint), and  
cooling demand exists (Y1 energized).  
NOTE − Refer to HCWH Dehumidifier Installation Instructions for installation  
recommendations.  
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Use the Tests / Diagnostics features  
NOTE − Test mode lasts for 30 minutes (with the temperature updating every  
30 seconds) except for the defrost test, which lasts 30 seconds. Tests fea-  
ture provides the technician time to manually verify the equipment operation.  
select tests to run  
Blower  
HP Heat − 1st Stage  
HP Heat − 2nd Stage  
Cooling − 1st Stage  
Cooling − 2nd Stage  
Dehumidification  
The tests feature is available after setup has been completed once. After  
you press next in the final setup screen, the ꢁselect tests to run" screen (fig-  
ure 18) will appear. (If you want you may skip tests; press skip tests.)  
select all  
Gas Heat − Minimum Rate  
Gas Heat − Maximum Rate  
Humidification  
If you re−select the tests button from the full option screen (figure 17), a mes-  
sage to ꢁpress Start button below to begin system testing" appears. Press  
deselect all  
start  
skip tests  
equipment  
diagnostics  
setup  
tests  
alerts  
9:39 am Aug 15, 2012  
press start button below to begin system testing  
Figure 18. Select tests to run screen  
start  
equipment  
tests  
diagnostics  
setup  
alerts  
back  
current test: Blower  
Check Blower Operation  
Heating Rate  
%
EXIT  
9:39 am Aug 15, 2012  
Blower CFM Demand  
Blower Off Delay  
Blower On Delay  
Indoor Blower RPM  
Indoor Blower Power  
Flame Current  
1400CFM  
Off  
Off  
Figure 17. Start testing screen  
0
0.0000%  
0.000mA  
No Flame  
63ºF  
To run all of the tests, press select all. All boxes in the list of tests will be  
checked. Or, touch box(es) next to test(s) to run certain tests.  
Flame Sense  
Outdoor Temperature  
After the tests have been started, the screen will describe which test is run-  
viewing the results and concluding that no further tests are needed, press  
next to proceed to next test. The technician must verify that the test proce-  
dure is producing the desired result at the equipment.  
cancel  
next  
9:39 am Aug 15, 2012  
Figure 19. Typical tests results screens  
icomfort Wi-Fi7−Day Programmable Communicating Thermostat  
Page 19  
 
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After pressing next after the final test, the ꢁTesting finished" screen will ap-  
pear (figure 20). 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).  
Set up Equipment parameters  
Press equipment to set up equipment parameters and edit details of de-  
vices in the system without having to re−run the setup program. When the  
ꢁpress start..." screen (figure 21A) appears, press start. The ꢁEquipment pa-  
rameters" screen (figure 21B) will open. You may view information about or  
modify communicating devices as described earlier in the setup pages, be-  
ginning on page 14. Use the arrows to select a device and press edit.  
setup  
tests  
equipment  
alerts  
diagnostics  
Use the arrows to highlight a setting and then press edit (figure 22A). In the  
example, the low heating airflow is changed from the default (400) to 325 (fig-  
ure 22B). After changing, press save. (note the current value has changed;  
figure 22C). Some changes may affect other settings and, if so, those af-  
fected will appear in red and require changing/saving to clear the red set-  
tings.  
The Testing Process is finished  
press ’tests’ button to run more tests  
setup  
tests  
equipment  
alerts  
diagnostics  
press ’EXIT’ button to start normal operation  
press start button below to edit details of devices in the system  
start  
setup  
tests  
equipment  
EXIT  
system devices  
about  
9:39 am Aug 15, 2012  
To adjust a setting,  
highlight it, then  
press Edit  
System  
Heat Pump  
Furnace  
Figure 20. Testing finished screen  
Equipment, Alerts, Diagnostics  
resetAll  
Furnace  
Thermostat  
Humiditrol  
edit  
Press equipment if you need to set up equipment parameters and edit de-  
tails of devices in the system (see Page 20).  
next  
9:39 am Aug 15, 2012  
Press alerts if you need to run to see any alerts that may present or to view  
alerts that have been cleared (see Page 22).  
Figure 21. Equipment parameters screen  
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When finished, press back; equipment parameters screen (figure 21B re-  
ther run tests as before or press skip tests.  
setup  
tests  
equipment  
system devices  
Equipment Name  
Low Heating Airflow  
The ꢁTesting process screen" (see figure 20) again appears; use the EXIT  
button (if you have completed the required setup), or use diagnostics but-  
ton (to analyze the system; see Page 21), or use equipmentbutton again (if  
you want to make any further changes to device details).  
current value:  
Heating Airflow Control Type  
Low Heating Airflow  
400  
High Heating Airflow  
edit  
Table3 on (on Page 37) shows a list of Editable Parameters for the currently  
available devices designed to communicate in this system. Other devices  
and additional parameters may be added at a later time. Check the unit  
installation manuals (i.e. furnace, air handler, heat pump, ac unit) for current  
information and default parameters.  
High Cooling Airflow  
setup  
tests  
equipment  
system devices  
Low Heating Airflow  
Equipment Name  
Heating Airflow Control Type  
current value:  
Run Diagnostics  
Low Heating Airflow  
325  
High Heating
NOTE To run diagnostics and insure the system works properly, the system  
should be runningꢁset the thermostat so that it will initiate a demand for  
cooling, heating, dehumidification, humidification, or continuous fan opera-  
tion.  
edit  
Low Heating Airflow  
Range is 325 to 450  
Default is 400, inc: 25  
High Cooling
Airflow Profil
resetAll  
High HP Airf
set−to  
Continuous Ind
If you need to run diagnostics to analyze the system, press the diagnostics  
Heating Indoor
back  
325  
save  
9:39 am A
Use the arrow buttons to scroll through the list of items found on the left of the  
screen. The right side of the screen shows which item is selected. Use start  
to begin the process. A ꢁwaiting" message displays while the diagnostics are  
cancel  
Use the arrow buttons to scroll through the information and take note of any  
found to be out of operating range.  
Figure 22. Edit equipment details  
icomfort Wi-Fi7−Day Programmable Communicating Thermostat  
Page 21  
 
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Press done when finished with the information. Select another device to  
diagnose or use EXIT (to close and go to user Home screen) if finished.  
From the user’s home screen, press and hold the ꢁLennox" logo in the bottom  
right corner of the thermostat to access the installer program. Press yes  
when asked if you want to proceed. The installer screen opens at the ꢁsys-  
setup  
tests  
equipment  
alerts  
diagnostics  
The left side of the "system and device alerts" screen shows a list of each  
communicating device discovered in the system and check boxes for select-  
ing each device. Or, you may use buttons to the right of the System Devices  
list to select all (or deselect all). After something has been selected; use  
view active to list all active alerts for selected devices. If there are no alerts,  
the display will show ꢁThere are no new alerts that require service". If there  
are alerts, these are stored for recall but only one alert will appear in the box  
at a time (see figure 24B). Use the next button to advance through all the  
alerts. If only one alert is present, the next button will not appear.  
select a device:  
Heat Pump  
current selection:  
Furnace  
Furnace  
start  
Alerts may pop up on the screen during setup. Details of all active alerts can  
only be accessed through the installer’s screens. To view all alerts present at  
any time, press the alerts button. ꢁSystem setup / Diagnostics is complete"  
(figure 24B) appears; close it and the ꢁSelect devices to view alerts screen  
(figure 24A) appears.  
DIAGNOSTICS  
Furnace  
Heating Rate  
40.0%  
Blower CFM Demand  
250 CFM  
Off  
Use view cleared alerts to list previously active alerts that were cleared by  
the device or installer. Until at least one alert has been cleared by the device  
or the installer, the message ꢁThere are no new alerts that require service"  
will be displayed.  
Blower Off Delay  
Blower On Delay  
Indoor Blower RPM  
Indoor Blower Power  
Flame Current  
Off  
waiting  
waiting  
waiting  
waiting  
Flame Sense  
1.  
2.  
red alert icon  
Outdoor Temperature  
88.0ºF  
yellow alert icon (service)  
done  
A red alert icon identifies a system or device issue that can prevent the sys-  
tem from working properly or at all, and if allowed to run, could cause dam-  
age to the system. The issue raised by the alert must be addressed and  
corrected before clearing the alert!  
9:39 am Aug 15, 2012  
Figure 23. Select device and run diagnostics  
View and clear Installer Alerts  
NOTE Service alerts remind users to service filters, humidifier pad, UV light and  
PureAirt Air Purification system and are not shown in the installer’s menu.  
Press clear (figure 24B) to clear a red alert. The alert will be stored in the  
ꢁcleared alerts" file. If an alert cannot be cleared, revisit the alert issue and  
make repairs accordingly.  
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setup  
tests  
equipment  
alerts  
diagnostics  
setup  
tests  
equipment  
System Devices  
System  
system and device alerts  
No Alerts  
Furnace  
Thermostat  
select all  
view active  
deselect all  
view cleared  
back  
9:39 am Aug 15, 2012  
EXIT  
tests  
setup  
equipment  
Figure 25. Cleared alert confirmation  
View cleared alerts  
alert description  
active alerts  
ALERT 1 of 5  
A history of cleared alerts allows the installer to review cleared alerts. This  
information can help diagnose problems. Use the arrows to select either se-  
lect all or check an item from the list and then press view cleared alerts.  
Then, scroll through the alerts using the next button.  
Minor Alert Code: 117  
System reports:  
(Furnace) Poor Ground detected  
clear  
Latest Occurrence:  
10/25/2011 1:13 pm  
2 Occurrences  
back  
NEXT  
First Occurrence:  
10/25/2011 12:01 pm  
setup  
tests  
equipment  
alert description  
9:39 am Aug 15, 2012  
ALERT 1 of 5  
cleared alerts  
Minor Alert Code: 117  
System reports:  
(Furnace) Poor Ground detected  
Figure 24. Selecting and viewing alerts  
Latest Occurrence:  
10/25/2011 1:13 pm  
2 Occurrences  
First Occurrence:  
10/25/2011 12:01 pm  
After all active alerts have been cleared, only the back button remains and  
back  
next  
9:39 am Aug 15, 2012  
Press back to return to the system and device alert screen (figure 24A,  
Figure 26. Cleared alerts screen  
icomfort Wi-Fi7−Day Programmable Communicating Thermostat  
Page 23  
 
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Enable the thermostat’s Wi-Fi feature from the Home screen  
Secure Connection Recommended!  
network security key or passphrase  
press any line to edit it  
network name (SSID)  
none  
WEP  
5.2  
Make sure the router is capable of, and set to operate in  
wireless network ꢁb" mode. Check router utility program or  
contact service provider for help. A secure wireless net-  
work is recommended over an open (unsecured) network.  
You will need the homeowner’s approval and router pass-  
word to enable Wi−Fi in a secured connection.  
displays information here as keys pressed  
security  
is WPA2  
press here to enter network name  
6
6
5.2  
a
press here to enter Wi−Fi AP (router) password  
WPA  
password  
WPA2  
Enable Wi−FiꢁTo enable the Wi−Fi feature to com-  
municate with a wireless router:  
7 END  
connect  
1. Press and release ꢁWi−Fi" in the lower left corner of  
the HOME screen (see START HERE). The screen  
changes from the Home Screen to the WI−FI SET-  
TINGS screen.  
type the network security key or passphrase for  
(locked Wi−Fi Access Point [AP])  
press here to enter Wi−Fi AP (router) password  
6
WI−FI SETTINGS  
2. Press the Wi−Fi enable button.  
3. Press next as necessary; then press accept after  
reading the User Agreement.  
7 END  
connect  
NETWORKꢀSETTINGS  
4. Press NETWORK SETTINGS; this screen shows a  
graphical view of buttons representing Wi−Fi options  
OPEN and SECURE wireless networks and a button  
for creating a new access point (AP).  
Wi−Fi  
disable  
5.1  
7 END  
5.0  
5.2  
5.0 UNSECU-  
RED ACCESS  
POINT  
5.1 SECURE  
Access Points  
5. Decide which of the following buttons you need to  
select:  
5?  
5.0ꢀOPEN Wi−Fi Port (no password required).  
5.1ꢀSECURE Ports (requires router password).  
5.2ꢀCreate new AP (Access Point).  
5.2 CREATE NEW AP  
5.2aꢀWhen creating a new AP, you have the option  
of selecting a security level (default is none; choose  
from WEP, WPA, WPA2, depending on the security  
defined in the homeowner’s router); the password  
field appears.  
User Agreement  
1
WI−FI SETTINGS  
next...  
next...  
START  
HERE  
Wi−Fi  
4
3
6. When you touch in one of the input fields (press here  
to enter...), the keyboard tool appears. Enter pass-  
word (if simply logging into an existing network) or  
enter the network name if creating a new AP. If you  
mistype the password or if you cannot access the  
selected network, a message will alert you to retry.  
7. Press connect to complete the connection. Note  
that ꢁWi−Fi enable" button on the Wi−Fi SETTINGS  
screen changes to ꢁWi−Fi disable".  
Wi−Fi  
enable  
NETWORK  
SETTINGS  
accept  
decline  
2
1
Figure 27. Wi−Fi setup  
506920−01 09/12  
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NOTE − Time from pushing the registration button on the thermostat and re-  
ceiving the consumer portal register link from your email on your computer is  
from 5 to 15 minutes.  
Registering the icomfort Wi-Fithermostat  
From NETWORK SETTINGS screen, you can change to the desired net-  
work as shown in figure 28. Enter security key or passphrase. ꢁX" back to the  
WI−FI SETTINGS screen.  
After registration has been completed, any available firmware downloads  
will immediately start downloading to the thermostat.  
REGISTRATION  
NOTE NETWORK’s marked with * - Selecting one of these  
wireless networks may result in an unreliable connection to  
your thermostat. Press help ꢀ?" for tips on improving signal  
strength.  
Register with iComfort thermostat to enable remote access and  
online weather information  
choose a wireless network  
(returns to  
WI−FI SETTINGS  
screen)  
NETGEAR  
NETWKB  
NETWKC  
NETWKD *  
enter your email  
re−enter your email  
System Desc  
type the network security key or passphrase for  
NETGEAR  
register  
ew  
rk  
WI−FI SETTINGS  
(returns to  
HOME  
screen)  
AP Info  
dis−  
connect  
thermostat  
not  
registered  
Firmware  
update  
auto  
Wi−Fi  
enabled  
connected  
press to  
change network  
settings  
press to enable  
/ disable Wi−Fi  
press to change  
thermostat regis- ware update between  
tration ꢁauto" and ꢁoff"  
press to toggle firm-  
Figure 28. Change Networks  
Registration for online access  
From the WI−FI SETTINGS screen, press the ꢁthermostat not registered"  
NOTE −  
If any downloads are available for the thermostat they will start downloading  
right away. When new firmware is being downloaded or when Gelaskins are  
being installed, the thermostat screen will temporarily go blank and running  
button (see figure 29).  
units may cease operation while the system is being reset to accommodate  
the new changes. This is normal and can last a couple minutes.  
Enter homeowner email address twice and press the register button.  
A pop up screen then appears to notify the user to check their home comput-  
er for instructions to complete the registration. After the server sends the  
email with the network link, registration and account creation must be com-  
Figure 29. Registering the system for online access  
For any issues with Wi−Fi connections, refer to Wi−Fi Troubleshooting  
Checklist 507037−01.  
icomfort Wi-Fi7−Day Programmable Communicating Thermostat  
Page 25  
 
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Personal Computer account registration for icomfort Wi-Fiserver  
NOTE − This following information is customer setup in-  
structions and is shown here to allow the installer to help  
walk the customer through the setup process.  
After registering through your icomfortWi-Fithermostat in-  
terface, go to the homeowner’s computer and locate the  
email sent from the server:  
Dear Customer,  
Congratulations on your purchase of a Lennox icomfort ther-  
mostat! You are only a few steps away from total control of  
your Lennox icomfort system. Registering your thermostat  
will allow you to remotely access it from anywhere in the  
world on any device with an internet connection. Please com-  
plete your Lennox icomfort registration by clicking the link be-  
low:  
Register  
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. ClickCreate User button.  
A series of pages and prompts follows to provide guidance  
through profile setup and user preference definitions.  
Figure 30. icomfort Wi-FiRegistration screen  
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Personal Computer Welcome page; Interactive Demo; Online icomfort information; Using Gelaskins  
Welcome home.  
®
Access all the great Wi−Fi enabled features on your icomfort thermostat  
from our secure web portal. After signing in, you´ll be able to view your icom-  
fort system settings, adjust the temperature and view reminders and alerts ˘  
just as you would on your icomfortWi-Fithermostat at home. With a famil-  
iar look and settings this simple, you should feel right at home. Don´t forget to  
check out the available Apps and customizable skins using the links on the  
right side of the page. From the welcome page, you may also click on links to  
launch an interactive demo or learn more abouticomfort Wi-Fi.  
How Do I Turn on Skins on the icomfort Wi-FiThermostat?  
From the thermostat Home screen, press then display setting then  
power save buttons. From the pop−up menu, select skins. The skin picture  
will appear after 30 seconds of inactivity.  
How Do I Upload a Skin?  
dering the skin, Gelaskins will email the image file (.jpg) to the homeowner.  
This ꢁ.jpg" has been altered to display correctly on the icomfortWi-FiTher-  
mostat. Images can be uploaded to the icomfortWi-Fithermostat from the  
Figure 31. PC Welcome Screen  
icomfort Wi-Fi7−Day Programmable Communicating Thermostat  
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Access installer program from Home screen  
To access the installer program after the unit has been placed in operation  
and the user home screen is displayed, press the ꢁLennox" logo and hold for  
5 seconds (see figure 32). The system will access the installer screens.  
A message screen stating ꢁQualified Lennox equipment installer warning"  
screen appears (Figure 33). Press yes to proceed (no returns to the home  
screen).  
WARNING!  
away  
outdoor  
temperature  
The following screens are intended for use by qualified Lennox  
equipment installers only.  
mode  
indoor temperature  
set temp  
heat  
or  
cool  
80  
75  
Do you want to proceed?  
cool−to  
yes  
no  
fan is  
AUTO  
72  
AOUFTFO  
heat to  
indoor humidity is 41%  
Figure 33. Qualified Lennox equipment installer warning  
system is cooling  
When you press yes, the thermostat’s processor will search for communi-  
cating devices in the system. The next display will be a summary of all alerts  
detected (see figure 34A).  
9:39 am Aug 15, 2012  
Wi−Fi  
After initial installation, if an alert is present when you are making changes to  
settings, no action on the alert is mandatory.  
Figure 32. Enter installation setup mode from home screen  
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Reconfigure a system  
If any component of the HVAC system has been changed, e.g. replacing an  
outdoor sensor, reconfiguring the system will be required. To begin reconfi-  
guring a system (after you have accessed the program from the Lennox logo  
[previous page]), press the setup button (1, figure 34A). The ꢁStart system  
configuration" screen (fig. 34B) will appear. Press start (2, figure 34B) to pro-  
minder notes that system configuration may affect some existing device set-  
tings and prompts to confirm or cancel the configuration process.  
Press confirm (3, figure 34C) 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  
NOTE − ꢀCompatible device found" screen (shown below) appears only  
when a device has been removed and replaced with a compatible device.  
Missing  
Found Compatible  
Device Equipment Type No.  
Model No. (control model no.)  
Serial No. (control serial no.)  
Device Equipment Type No.  
Model No. (control model no.)  
Serial No. (control serial no.)  
Settings were not copied  
setup  
tests  
equipment  
alerts  
diagnostics  
system and device alerts  
Select Devices  
System  
setup  
tests  
equipment  
alerts  
setup  
press start button only if you w
diagnostics  
tests  
Furnace  
Thermostat  
equipment  
alerts  
diagnostics  
or to re−setup an e
configuring the system may effect some devices.  
2
confirm to continue or press cancel  
start  
3
confirm  
cancel  
9:39 am Aug 15, 2012  
9:39 am Aug 15, 2012  
EXIT  
9:39 am Aug 15, 2012  
Figure 34. Re−configuration process  
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Stage Delay & Differential Settings (Installer settings)  
1st Stage Differential1ꢀStage 1 differential is used in all thermostats. The  
default is 1.0°F but can be programmed between 0.5° and 3.0°F in 0.5°F in-  
crements.  
previous stage of heating or cooling will not raise or lower the room tempera-  
ture to the setpoint in a given time.  
When Disabled is selected all stage delay timers are disabled. This means  
stages are changed based on the temperature and not their timer delays.  
From the equipment button, use the arrows to select 1st Stage Differential.  
Press edit. Use the up/down arrows to adjust to the desired setting and  
press save.  
NOTE − The 2nd Stage Delay Timer (when Staged Delay Timers is Enabled)  
is used for both HEATING and COOLING. However, if the system has a vari-  
able capacity furnace, 2nd Stage Delay Timer will only be used for COOL-  
ING (not for heating, as the variable capacity algorithm ignores delay tim-  
ers).  
2nd Stage Differential (where applicable)2ꢀThe default is 1.0°F but can be  
programmed between 0.5° and 8.0°F in 0.5°F increments.  
3rd Stage Differential through 6th Stage Differential (where applica-  
ble)3ꢀThe default is 0.5°F but can be programmed between 0.5°F and  
8.0°F in 0.5°F increments.  
2nd thru 6th Stage Delay timer (where applicable)5ꢀIf Staged Delay Tim-  
ers are Enabled, the default delay is 20 minutes but can be programmed  
from 5 to 120 minutes in 5−minute increments. If first stage fails to advance  
the ambient temperature toward the setpoint by 1.0°F in the programmed  
delay time, then the second stage is activated.  
NOTE − Each stage’s differential is based on the previous stage’s differential  
endpoint. For example, in cooling mode, if stage 1 differential is set to 1.0ºF,  
then the system comes on 0.5ºF above setpoint and the 2nd differential  
starts at the 0.5ºF stage 1 endpoint and extends to 2nd stage differential end-  
point.  
Heat Cool Stages Locked In6ꢀdefault Disabled (heat/cool stages are  
turned off separately). If changed to Enabled, heat/cool stages are turned off  
together. Scroll to Heat Cool Stages Locked In; press edit. Use arrows to  
select between Disabled or Enabled. Press save.  
NOTE − In normal operation, the end of the cooling demand is at the setpoint  
−0.5ºF and the end of the heating demand is at the setpoint +0.5ºF.  
Lock In 2nd stage HP by Outdoor Temp7ꢀdefault Off (heat pump stage 2  
operates normally). Use this setting to lock in the 2nd stage compressor  
when the outdoor temperature is at or less than the LOCK TEMP setpoint.  
Scroll to Lock In 2nd stage HP by Outdoor Temp; press edit. Use arrows to  
select a temperature between 40 and 55ºF. Press save.  
Staged Delay Timers4ꢀdefault Enabled. When ON, 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) in cases when the  
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Smooth Setback Recovery (SSR)  
SSR is an algorithm designed to ꢁsmoothly" reach a occupied program  
schedule setpoint. The algorithm looks 2 hours ahead for the occupied pro-  
gram schedule period’s setpoint. If the occupied setpoint requires the sys-  
tem to turn on (present temperature below the heat setpoint or above the  
cool setpoint), then SSR will calculate a new setpoint. Once initiated, SSR  
monitors the change in room temperature and calculates a new setpoint ev-  
ery 30 seconds. Then SSR provides this new setpoint for the heating and  
cooling algorithms; the new setpoint will be displayed on the User Interface.  
Rules for SSR:  
1. SSR is enabled when ꢁSmooth Setback Recovery" is set to enabled  
and the program schedule is turned on.  
2. When SSR is enabled, then it will check for a new setpoint every 30  
seconds.  
3. The SSR Target Program Schedule setpoint is always 2 hours ahead.  
4. When SSR starts, then the Current SSR setpoint will equal the current  
program schedule setpoint.  
5. When a new program schedule period starts, then the New SSR set-  
point will equal the new program schedule period’s setpoint, unless  
there are two or more program periods within the 2 hour window. In this  
case, SSR will track the highest heat setpoint or the lowest cool set-  
point found in the 2 hour window.  
6. SSR will NOT run during a program schedule HOLD.  
7. SSR does NOT look at the current temperature.  
8. If the target program heat setpoint is lower than the Current SSR heat  
setpoint, then the New SSR Heat Setpoint will equal the Current SSR  
Setpoint.  
9. If the target program cool setpoint is higher than the Current SSR cool  
setpoint, then the New SSR Cool Setpoint will equal the Current SSR  
Setpoint.  
10. The New SSR Setpoint will be displayed on the User Interface.  
11. SSR does NOT control the equipment.  
12. SSR does NOT turn off Stage Delay Timers.  
13. SSR does NOT round the newly rounded setpoint, but the setpoint  
shown on the user interface is rounded.  
14. SSR will NOT change the Temperature Dead band.  
15. SSR will not adjust a setpoint to violate the Temperature Dead band.  
16. SSR will not overshoot the Target Setpoint.  
icomfort Wi-Fi7−Day Programmable Communicating Thermostat  
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Heat Pump, Dual Fuel and Balance Points  
IMPORTANT − The Balance Points feature requires that a sensed out-  
door temperature is provided to the thermostat. This can be either a  
connection to Wi−Fi (for local temperature information) or a connection  
to an outdoor sensor (included in all communicating icomfortt−en-  
abled heat pumps; optional outdoor temperature sensor X2658 for  
non−communicating heat pumps).  
pump is not as effective at a lower outdoor temperatures, it may be more  
comfortable to use the auxiliary electric heat or the furnace (in dual fuel sys-  
tems, it may be more economical) to satisfy a demand for heat. The low bal-  
ance point options are from −20°F to the high balance point temperature. The  
setpoint can be adjusted in 1.0°F steps.  
High Balance Point  
If the outside temperature is above the programmed high balance point (set  
by default at 50°F), auxiliary electric heat operation or furnace operation (in  
dual fuel system) is not allowed. This ensures that the lower cost heat pump  
operation will satisfy the heating demand, rather that the more expensive  
auxiliary electric heat. The high and low balance points will not lock out both  
compressor heat and auxiliary heat/furnace at the same time.  
Heat Pump Balance Points  
The LOW and HIGH setpoints may be controlled by the icomfortWi-Fither-  
mostat using the LOW and HIGH Balance Points feature. To enable the Bal-  
ance Points feature, go to the installer section equipment button. Scroll  
down to the ꢁSystem" screen, select edit and scroll down to Balance Points  
Controls. Use arrows to select Enabled and then press save. See the flow-  
chart (Page 33) for a simplified explanation of how balance points control  
system operation.  
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. Figure 35 flow chart illustrates Dual Fuel operation with Bal-  
ance Points.  
Low Balance Point  
If the outside temperature is below the programmed low balance point (set  
by default at 25°F), compressor operation is not allowed. Since the heat  
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Shut down HP  
Stg 1...Stg 2  
Abbreviations:  
FURN = auxiliary heat provided by gas furnace  
HP = compressor heat  
NO  
T’stat  
LBP = Low Balance Point  
HBP = High Balance Point  
T’stat = thermostat  
YES  
heat  
demand  
?
FURN  
heat  
lockout  
NOTE 1 − Each Heat Pump and Furnace Heat stage will oper-  
ate until it meets the demand or until its stage timer lapses (20  
minutes by default). If the timer lapses before the demand is  
met, the system brings on the next stage in order of:  
HP−stg−1, HP−stg−2, FURN−stg−1, FURN−stg−2.  
Operate HP  
Stg 1...Stg 2  
at  
HP stage(s) operate first;  
then FURN stage(s) (if  
needed; see NOTE 1)  
NOTE 2 − The chart below illustrates how the balance points  
control whether HP or FURN will operate to provide heat.  
or above  
HBP  
if  
outdoor  
temperature  
is...  
T’stat  
heat  
demand  
?
between  
HBP and LBP  
Operate HP  
Stg 1...Stg 2  
YES  
(See NOTE 2)  
COMPRESSOR ONLY  
HBP − FURNACE  
at or  
below  
LBP  
50ºF  
LOCKOUT TEMPERATURE  
T’stat  
heat  
demand  
?
YES  
EITHER COMPRESSOR  
OR FURN HEAT  
NO  
LBP − COMPRESSOR  
LOCKOUT TEMPERATURE  
25ºF  
Operate FURN  
Stg 1...Stg 2  
FURN ONLY  
Operate FURN  
Stg 1...Stg 2  
T’stat  
heat  
demand  
?
NO  
Heat  
pump  
lockout  
YES  
NOTE 3 − If emergency heat is selected, Furnace is used.  
T’stat  
heat  
YES  
demand  
?
Shut down FURN  
Stg1...Stg 2  
NO  
Figure 35. Dual Fuel Operation with Balance Points  
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Gas Heat Control Mode  
Increase firing  
rate to 100%  
until thermostat  
demand is  
Differential  
less than 2nd stage  
differential  
Differential  
less than 3rd stage  
differential  
?
Differential  
less than 4th stage  
differential  
?
THERMOSTAT  
DEMAND  
NO  
NO  
NO  
?
satisfied  
YES  
YES  
YES  
Increase firing rate  
to calculated 2nd  
stage firing rate  
Increase firing rate  
to calculated 3rd  
stage firing rate  
Starting firing rate  
as determined by  
variable capacity  
algorithm (35 to  
100%)  
SYSTEM  
IDLE  
T’stat  
demand sat−  
isfied in less than  
5 minutes  
?
T’stat  
demand sat−  
isfied in less than  
5 minutes  
?
Differential  
less than 2nd stage  
differential  
YES  
YES  
NO  
?
NO  
NO  
YES  
Differential  
less than 4th stage  
Differential  
less than 3rd stage  
differential  
?
Continue at  
starting firing rate  
NO  
NO  
differential  
?
YES  
YES  
T’stat  
demand  
satisfied  
?
Firing rate  
increased by  
5% every 5  
minutes up to  
100% firing rate  
Firing rate  
increased by  
5% every 5  
minutes up to  
100% firing rate  
NO  
YES  
T’stat  
demand  
satisfied  
?
T’stat  
demand  
satisfied  
?
NO  
NO  
YES  
YES  
Figure 36. Variable Capacity Operation Flow Chart  
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The thermostat monitors room temperature, previous heat cycle times, and  
target setpoint to determine the starting firing rate, and any required firing  
rate increases or decreases during the thermostat demand.  
Variable Capacity Control of Gas Heat Mode  
(G71MPP and SLP98V)  
The thermostat includes a feature that provides variable capacity control of  
the gas heat mode. The purpose of variable capacity control is to keep the  
room temperature at, or near, the desired setpoint with minimum system  
cycling. The thermostat bases its ꢁdecisions" for furnace operation control  
using the following inputs:  
During a heat demand, the icomfort thermostat monitors the differential be-  
tween setpoint and room temp. As this differential increases and reaches  
field adjustable levels (stages), the thermostat will increase firing rate ac-  
cordingly to maintain room temperature and ultimately satisfy the heat de-  
mand. On the next heat cycle, the icomfort stat will calculate a new starting  
firing rate (in 1% increments) with the goal of maintaining room temperature  
at, or near, thermostat setpoint with a minimum of system cycling. The prin-  
Room temperature,  
History of cycle times (how long does it typically take to bring the room  
temperature to the desired setpoint),  
Target setpoint, and  
Differential temperature settings between 1st − 4th stage.  
Table 2. Variable Capacity Furnace Operation  
The thermostat uses this information to vary the heating capacity to efficient-  
ly satisfy the heating demand. The full range of the furnace heating capacity  
(low end is a percent of the 1st stage capacity; high range is 100% of full  
capacity) is used. When in variable capacity gas heat mode, the furnace op-  
eration includes longer run times at lower heat stages.  
T’stat Demands  
Operation  
None  
Furnace is off  
First level heat de-  
mand.  
1. Furnace BTU rate is calculated by the icomfort integrating al-  
gorithm.  
2. Furnace firing rate will continue at current heating rate until  
first stage demand is satisfied or an additional thermostat de-  
mand is received.  
Table 2 details the variable capacity furnace operation.  
Staged operation  
Second level heat  
demand added  
1. Thermostat will immediately increase variable capacity fur-  
nace firing rate to the calculated BTU percentage represent-  
ing the second stage thermostat demand.  
Some furnaces can be configured to provide up to four stages of gas heat  
operation. When staged heating is chosen, the icomfort thermostat allows  
you to choose between 1, 2, 3 and 4 stages of heat.  
2. Furnace firing rate will increase by 5% every 5 minutes (up to  
100% if second stage thermostat is not satisfied.) If thermo-  
stat second stage demand is satisfied the current firing rate  
will continue until all thermostat demands are satisfied.  
Single−stage heat: 1st stage provides 100% of full capacity.  
Two−stage heat: 1st stage provides 70% of full capacity; 2nd stage  
provides 100% of full capacity.  
Third level heat de-  
mand added.  
1. Thermostat will immediately increase variable capacity fur-  
nace firing rate to the calculated BTU percentage represent-  
ing the third stage thermostat demand.  
Three−stage heat: 1st stage provides 60% of full capacity; 2nd stage  
provides 80% of full capacity; 3rd stage provides 100% of full capacity.  
Four−stage heat: 1st stage provides 35 or 40% of full capacity; 2nd  
stage provides 60% of full capacity; 3rd stage provides 80% of full ca-  
pacity; 4th stage provides 100% of full capacity.  
2. Thermostat will increase the firing rate by 5% every 5 minutes  
(up to 100% if third stage thermostat is not satisfied.) If ther-  
mostat third stage demand is satisfied the current firing rate  
will continue until all thermostat demands are satisfied.  
Fourth level heat de-  
mand added.  
Icomfort thermostat will immediately set variable capacity  
furnace firing rate to 100% until all thermostat demands are  
satisfied.  
SLP98 variable capacity furnaces BTU’s firing rates can be incremented by  
as little as 1% (35% to 100% range available) as the thermostat may dictate.  
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Page 35  
 
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Interesting points about the Proportional Integral Algorithm  
(PIA):  
Load−trackingVariable Capacity FAQs  
(SLP98V only)  
What is Load−tracking Variable Capacity? When an SLP98 Furnace is  
connected to an icomfort Wi−Fithermostat, the thermostat takes complete  
charge of the variable capacity staging of the furnace. Loadtracking Vari-  
able Capacity is only available with icomfort Wi−Fi thermostats.  
The further temperature is from the current set point, the higher PIA  
sets the heating rate.  
The longer away from a programmed set point, the higher the heating  
rate.  
How is Load−tracking Variable Capacity different from Variable Ca-  
pacity? Load−tracking Variable Capacity will smoothly track the load (sensi-  
ble temperature changes) up and down and adjust the furnace heating rate  
both ways. Variable capacity only tracks the load upward (rising tempera-  
ture). Variable capacity uses the thermostats stage differentials but not  
stage timers. LVC disregards both stage differentials and stage timers.  
If needed, PIA will turn heating on and off in short cycles when there  
is a heat demand that is lower than the lowest the furnace can provide.  
If the heat demand is higher than the minimum the furnace can provide,  
the furnace will run without shutting off.  
As the room temperature rises nearer the set point, the heating rate will  
decrease.  
What makes Load−tracking Variable Capacity work? With icomfort  
As the room temperature falls further away from the set point, the heat-  
ing rate will increase.  
Load−trackingVariable Capacity, the thermostat uses a Proportional Integral  
Algorithm (PIA) to control firing rates of the furnace. The algorithm in the  
Load−tracking Variable Capacity provides much more precise control over  
the furnace than the Variable Capacity algorithm.  
The stage differentials have no effect when running the PIA.  
The second stage timers have no effect when running the PIA.  
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Table 3. Adjustable Parameters Table (Installer)  
Parameter Name:  
Default  
Parameter Value Setting  
Increment  
Installer entry  
System (Go to equipment button and scroll to System) NOTE − All of the following changes are made on the stat.  
Equipment Name  
Calendar Time  
Calendar Time  
Calendar Time  
Calendar Time  
Calendar Time  
Enabled  
5ºF  
(keyboard input screen)  
Calendar Time, Run Time  
Calendar Time, Run Time  
Calendar Time, Run Time  
Calendar Time, Run Time  
Calendar Time, Run Time  
Enabled, Disabled  
3 to 9ºF  
Filter 1 Timer Selection  
Filter 2 Timer Selection  
UV Bulb Timer Selection  
Humidifier Pad Timer Selection  
PureAirTimer Selection  
Smooth Setback Recovery  
Auto Changeover − Temp Deadband  
Electric Heat Control Mode  
Gas Heat Control Mode: (SLP98, G71MPP)  
(SL280, EL296)  
1ºF  
Standard  
Load Tracking  
Staged  
Standard, Even Heat  
Load Tracking Variable Capacity, Variable Capacity, Staged  
Staged only  
Max Heat Setpoint  
90ºF  
40 to 90ºF  
1ºF  
1ºF  
Min Cool Setpoint  
60ºF  
60 to 99ºF  
Heat Cool Stages Locked In  
*1st Stage Differential  
*2nd Stage Differential  
*3rd Stage Differential  
*4th Stage Differential  
*5th Stage Differential  
*6th Stage Differential  
Stage Delay Timers  
Disabled  
1.0ºF  
Enabled, Disabled  
0.5 to 3ºF  
0.5ºF  
0.5ºF  
0.5ºF  
0.5ºF  
0.5ºF  
0.5ºF  
1.0ºF  
0.5 to 8ºF  
0.5ºF  
0.5 to 8ºF  
0.5ºF  
0.5 to 8ºF  
0.5ºF  
0.5 to 8ºF  
0.5ºF  
0.5 to 8ºF  
Enabled  
20 Minutes  
20 Minutes  
20 Minutes  
20 Minutes  
20 Minutes  
Enabled, Disabled  
5 to 120 Minutes  
5 to 120 Minutes  
5 to 120 Minutes  
5 to 120 Minutes  
5 to 120 Minutes  
*2nd Stage Delay  
5 Min  
5 Min  
5 Min  
5 Min  
5 Min  
*3rd Stage Delay  
*4th Stage Delay  
*5th Stage Delay  
*6th Stage Delay  
*Number of stages shown in thermostat is dependent on equipment that is installed. Electric heat will bring on 2 elements at a time if available.  
table continued on next page  
icomfort Wi-Fi7−Day Programmable Communicating Thermostat  
Page 37  
 
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Table 3. Adjustable Parameters Table (Installer)  
Parameter Name:  
Lock in 2nd stage HP by Outdoor Temp  
Balance Point Control  
Default  
Off  
Parameter Value Setting  
Off, 40ºF (4ºC), 45ºF (7ºC), 50ºF (10ºC), 55ºF (13ºC)  
Enabled, Disabled  
Increment  
Installer entry  
Disabled  
Maximum  
50ºF  
Humiditrol Comfort Adjust  
High Balance Point  
Maximum, Midpoint, Minimum Overcooling  
−17ºF to 75ºF  
1ºF  
1ºF  
1ºF  
Low Balance Point Control  
Defrost Target Discharge Temp  
25ºF  
−20ºF to 72ºF  
55ºF  
50ºF to 60ºF  
Display Only, Basic, Precision (only available when  
NO dehumidifier is installed)  
Dehumidification Control Mode  
Humidification Control Mode  
Display Only  
Display Only  
Display Only, Basic, Precision, Basic Dew Point Con-  
trol, Precision Dew Point Control  
Autochangeover Humidification Deadband  
Max Humidification Setpoint  
5%  
45%  
40%  
40%  
50%  
0
5% to 10%  
15% to 45%  
40% to 60%  
40% to 60%  
45% to 60%  
−10ºF to 10ºF  
1%  
1%  
1%  
1%  
1%  
1%  
Min Dehumidification Setpoint  
Max Dehumidification Setpoint  
OK/Humid Boundary  
Outdoor Temperature Reading Calibration  
OUTDOOREQUIPMENT (Go to EQUIPMENT button and scroll to HEAT PUMP or AIR CONDITIONER.)  
Equipment Name (HP & AC)  
Outdoor Unit  
300 Seconds  
On  
(keyboard input screen = up to 35 characters in string)  
60 Sec  
Compressor Short Cycle Delay (HP and AC)  
Compressor Shift Delay On/Off (HP only)  
Defrost Termination Temp (HP only)  
60 to 300 Seconds  
On, Off  
50ºF  
50ºF to 100ºF  
10ºF  
table continued on next page  
506920−01 09/12  
Page 38  
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Table 3. Adjustable Parameters Table (Installer)  
Parameter Name:  
Default  
Parameter Value Setting  
Increment  
Installer entry  
AIR HANDLER  
Equipment Name  
Air Handler  
(keyboard input screen)  
Electric Heating Airflow  
Low Cooling Airflow  
High Cooling Airflow  
5CFM  
5CFM  
5CFM  
nnnn CFM  
(See Note 3 at  
end of table)  
NOTE: CFM Default and Values Settings are depen-  
dent on the tonnage of the unit  
1: No Delays,  
2: ON: No delays; OFF: 45 sec delay  
3: ON: 82%/7.5min; OFF: No delays  
4: ON: 50%/30s,82%/7.5min; OFF:50%/30s  
Cooling Airflow Profile  
1
Low Heating Airflow  
5CFM  
5CFM  
nnnn CFM  
(See Note 3 at  
end of table)  
High Heating Airflow  
NOTE: CFM Default and Values Settings are depen-  
dent on the tonnage of the unit  
Continuous Indoor Blower Airflow  
Humidification Airflow  
10CFM  
10CFM  
60 to 80% (percentage of reduction of High Cooling  
Airflow)  
Dehumidification Airflow  
70%  
1%  
Delays:  
Heating Indoor Blower OFF  
10 sec  
0 sec  
0 sec  
2 sec  
45 sec  
0 sec  
0 to 10 Seconds  
0 to 5 Seconds  
0 to 30 Seconds  
0 to 10 Seconds  
0 to 60 Seconds  
0 to 30 Seconds  
1 sec  
1 sec  
2 sec  
1 sec  
5 sec  
5 sec  
Heating Indoor Blower ON  
Cooling Indoor Blower OFF  
Cooling Indoor Blower ON  
HP Indoor Blower OFF  
HP Indoor Blower ON  
icomfort Wi-Fi7−Day Programmable Communicating Thermostat  
Page 39  
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Table 3. Adjustable Parameters Table (Installer)  
Parameter Name  
Default  
Min.  
Max.  
Incr.  
Dependency  
Note  
Installer entry  
FURNACE  
Heating indoor blower OFF delay  
Heating indoor blower ON delay  
Cooling indoor blower OFF delay  
Cooling indoor Blower ON Delay  
Heat pump indoor blower OFF delay  
Heat pump indoor blower ON delay  
Gas Heat Airflow Settings  
DIP SW  
45 sec  
0 sec  
60  
15  
0
180  
45  
30  
10  
60  
30  
10  
5
None  
None  
DIP switch setting in  
Non−comm.  
45 sec fixed in Non−  
Comm. IFC  
2
Outdoor Unit  
present  
Not used on Non  
Comm. IFC  
2 sec  
0
1
Outdoor Unit  
present  
2 sec fixed in Non−  
Comm. IFC  
45 sec  
0 sec  
0
5
Heat Pump present  
Not used on Non  
Comm. IFC  
0
5
Heat Pump present  
Not used on Non  
Comm. IFC  
Heating Airflow Control Type (variable  
capacity furnaces only)  
0 – Fixed  
CFM  
0 (Fixed CFM)  
1 (Fixed DAT)  
0
1
1
DATS installed  
Low Heating Airflow (CFM @ min.  
heat)  
DIP SW  
DIP SW  
25  
25  
Heating Airflow  
Control Type = 0  
High Heating Airflow (CFM @ 100%  
heat)  
See furnace docu-  
mentation (IOM or  
engineering hand-  
book) for size spe-  
cific information  
See furnace documen-  
tation (IOM or engineer-  
ing handbook) for size  
specific information  
Low Heating Discharge Air  
Temperature (DAT @ min heat)  
(variable capacity furnaces only)  
DIP SW*  
DIP SW*  
5
5
Heating Airflow  
Control Type = 1  
High Heating Discharge Air  
Temperature (DAT @ 100% heat)  
(variable capacity furnaces only)  
* − Default DAT value is rounded to the closest number on 5 deg F resolution and limited by Minimum and Maximum value.  
table continued on next page  
506920−01 09/12  
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Table 3. Adjustable Parameters Table (Installer)  
Parameter Name  
Default  
Min.  
Max.  
Incr.  
Dependency  
Note  
Installer entry  
Cooling Airflow Settings  
High Cooling Airflow (CFM @ 100%  
cool)  
OU tons  
400CFM  
Min  
CFM  
Max  
CFM  
25  
25  
25  
25  
1
Outdoor Unit  
present  
1/2 HP blower  
1 HP blower  
1/2 HP blower  
1 HP blower  
Min  
CFM  
Max  
CFM  
Low Cooling Airflow (CFM @ lowest  
cool stage)  
(See Note 1  
at end of  
table)  
Min  
CFM  
Max  
CFM  
2+ stage Outdoor  
Unit present  
Min  
CFM  
Max  
CFM  
0
A:ON:50%/30s,82% /  
7.5min OFF:50%/30s  
B:ON:82% / 7.5min; OFF:  
No delays  
Airflow Profile − Cooling  
DIP SW  
0
3
Outdoor Unit  
present  
1
2
3
C:ON: No delays; OFF:  
45sec delay  
D:No delays)  
Heat Pump Airflow Settings  
High Heat Pump Airflow (CFM @  
100%)  
OU tons  
400CFM  
Min  
CFM  
Max  
CFM  
25  
25  
25  
25  
Heat Pump present  
1/2 HP blower  
1 HP blower  
1/2 HP blower  
1 HP blower  
Min  
CFM  
Max  
CFM  
Low Heat Pump Airflow (CFM @  
lowest stage)  
(See Note 2  
at end of  
table)  
Min  
CFM  
Max  
CFM  
2+ stage Heat Pump  
present  
Min  
CFM  
Max  
CFM  
table continued on next page  
icomfort Wi-Fi7−Day Programmable Communicating Thermostat  
Page 41  
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Table 3. Adjustable Parameters Table (Installer)  
Parameter Name  
Other Parameters  
Default  
Min.  
Max.  
Incr.  
Dependency  
Note  
Installer entry  
Equipment Name  
Furnace  
N/A  
N/A  
N/A  
25  
None  
None  
Up to 35 characters  
1/2 HP blower  
Continuous Indoor Blower Airflow  
DIP SW (See  
Note 3 at  
end of table)  
Min  
CFM  
Max  
CFM  
Min  
CFM  
Max  
CFM  
25  
25  
25  
1 HP blower  
1/2 HP blower  
1 HP blower  
Humidification Airflow  
Same as  
above  
Min  
CFM  
Max  
CFM  
Humidifier present  
Min  
CFM  
Max  
CFM  
Dehumidification Airflow Percentage  
140  
(=70%)  
120  
(=60%)  
160  
(=80%)  
2
(=1%)  
OU present and SC  
(Subnet Controller)  
algorithm support  
Percent of High Cooling  
Airflow  
Note 1:  
Note 2:  
Note 3:  
Minimum Outdoor Unit Cooling Stage as a percentage of High Cooling Airflow (value is rounded up to the closest number on 25 CFM resolution.  
Minimum Outdoor Unit Heating Stage as a percentage of High Heat Pump Airflow (value is rounded up to the closest number on 25 CFM resolution).  
All communicating Installer Parameters default CFM values based on DIP switch setting (non−communicating value) are calculated using the CFM conversion  
tables and rounded up to closest number on 25 CFM resolution.  
Note 4:  
Note 5:  
Parameter dependency − Certain parameters are dependent on others and may not be shown on the display.  
Default Values − Jumper/DIP switches impact the default value of some parameters.  
506920−01 09/12  
Page 42  
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Table 4. Adjustable Parameters Table (User)  
Parameter Name:  
Time and Date *  
Default  
Parameter Value Setting  
(Time/date elements screen)  
Enabled, Disabled  
Increment  
Installer entry  
Enabled  
auto  
Daylight Saving Time *  
Fan  
auto, on, circulate  
System Name  
(keyboard input screen)  
SERVICE INFORMATION  
Dealer Number  
****  
Lennox  
(keyboard input screen)  
(keyboard input screen)  
(keyboard input screen)  
(keyboard input screen)  
(keyboard input screen)  
(keyboard input screen)  
English, French, Spanish  
(F) Fahrenheit, (C) Celsius  
12 Hour, 24 Hour  
20%  
Dealer Name  
Dealer Address  
Dealer Phone  
1−800−9−LENNOX  
Dealer Email  
Dealer Website  
English  
(F)  
Language Displayed  
Temperature Display Scale **  
Clock Format  
12H  
Screen Lock−out  
Backlight Setting  
Backlight Intensity  
Outdoor Temp Display  
Indoor Humidity Display  
Power Save  
Unlocked  
Always On  
100%  
Unlocked, Partially Locked, Fully Locked  
Power Save, Always On  
20 to 100%  
is OFF  
is OFF, is ON  
is OFF  
is OFF, is ON  
is ON  
is OFF, is ON  
Background theme  
cobalt  
cobalt, cotton, carbon  
* Entered during initial installer setup (during initial discovery); should be edited from user preferences.  
** When Celsius mode is chosen, Celsius is only changed on home screen; all calculations and other setting are in Fahrenheit.  
table continued on next page  
icomfort Wi-Fi7−Day Programmable Communicating Thermostat  
Page 43  
 
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Table 4. Adjustable Parameters Table (User)  
Parameter Name:  
Filter 1 Timer  
Default  
Parameter Value Setting  
Increment  
Installer entry  
Disabled, 3 Months, 6 Months, 12 Months,  
24 Months, Custom Time  
Disabled  
Disabled  
Disabled  
Disabled  
Disabled  
Disabled  
Disabled, 3 Months, 6 Months, 12 Months,  
24 Months, Custom Time  
Filter 1 Timer  
Disabled, 3 Months, 6 Months, 12 Months,  
24 Months, Custom Time  
Humidifier Pad Timer  
UV Bulb Timer  
Disabled, 3 Months, 6 Months, 12 Months,  
24 Months, Custom Time  
Disabled, 3 Months, 6 Months, 12 Months,  
24 Months, Custom Time  
Maintenance Timer  
PureAir Timer  
Disabled, 3 Months, 6 Months, 12 Months,  
24 Months, Custom Time  
THERMOSTAT (Go to equipment button and scroll to Thermostat.)  
NOTE − These settings apply to the thermostat’s internal sensors.  
Equipment Name  
(keyboard input screen)  
−5ºF to 5ºF  
1ºF  
Temp Reading Calibration  
Humidity Reading Calibration  
0ºF  
0%  
−10 to 10%  
1%RH  
506920−01 09/12  
Page 44  
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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.  
Table 5. Alert Codes and Troubleshooting  
Alert  
Code  
Priority  
Alert Text  
Steps to clear  
10  
Critical  
(Stat) The thermostat has found an unknown  
device on the system.  
An unknown device is seen on the subnet in or outside of configuration mode. Clear by reconfiguring  
the system. Press the setup tab, press start, and press confirm. If problem persists, then check all  
DEVICE connections to make sure they are icomfort−compatible.  
11  
12  
14  
18  
Critical  
Critical  
Critical  
Minor  
(Stat) The thermostat cannot find a previously  
installed unit.  
Check all connections and cycle system power. If problem persists, clear by reconfiguring the sys-  
tem. Press the setup tab, press start, and press confirm. If problem persists, then check all DEVICE  
connections to make sure they are icomfort−compatible.  
(Stat) The thermostat cannot find an icomfort−  
enabled indoor unit.  
Thermostat did not find an Indoor Unit. Make sure there is an icomfort 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.  
(Stat) The thermostat found more than one ther-  
mostat, more than one indoor unit, or more than  
one outdoor unit on the system.  
Check wiring and remove duplicate equipment. Reconfigure system.  
(Stat) The outside temperature is below the lev-  
el where the heat pump is programmed 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.  
19  
29  
30  
Minor  
(Stat) 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.  
Critical  
Moderate  
(Stat) The thermostat is reading an indoor tem-  
perature that is higher than 99ºF. The thermo-  
stat will not allow any heating operation to begin  
until it senses a temperature lower than 99ºF.  
Indoor temperature rose above 99ºF 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.  
(Stat) The thermostat is reading an indoor tem-  
perature that is lower than 40ºF. The thermostat  
will not allow any cooling operation to begin un-  
til it senses a temperature higher than 40ºF.  
Indoor Temp fell below 40ºF. Cooling operation is not allowed. Check to ensure that cooling equip-  
ment is not stuck ON. Check accuracy of the thermostat temperature sensor. Select heating system  
mode to heat the indoor space to above 40ºF.  
31  
32  
Critical  
(Stat) The thermostat has lost communication  
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 communication is restored.  
Moderate  
(Stat) 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.  
table continued on next page  
icomfort Wi-Fi7−Day Programmable Communicating Thermostat  
Page 45  
 
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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.  
Table 5. Alert Codes and Troubleshooting  
Alert  
Code  
Priority  
Alert Text  
Steps to clear  
34  
Critical  
(Stat) The thermostat does not know the capac-  
ity (tonnage) of the (furnace, air−handler or out-  
door 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 program 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.  
36  
37  
Critical  
Critical  
Critical  
Critical  
Critical  
(Stat) 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 expected.  
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.  
(Stat) 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 expected.  
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  
(Stat) The system has not been able to turn on  
the heating for more than 45 minutes. The sys-  
tem 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 expected.  
Step 1: Check all heating equipment to determine cause.  
Step 2: Recycle power.  
System will clear code when it detects condition has cleared.  
39  
(Stat) The system has not been able to turn on  
the cooling for more than 45 minutes. The sys-  
tem 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 expected.  
Step 1: Check all cooling equipment to determine cause.  
Step 2: Recycle power.  
System will clear code when it detects condition has cleared.  
105  
(Stat / Furnace / Air Handler / Outdoor Unit) The  
(stat, furnace, air−handler or outdoor unit) has  
lost communication 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 mis−wired and/or loose connections between the stat, 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  
111  
Critical  
Critical  
(Furnace) The line voltage is too low.  
This alarm/code may appear during a brownout. Line voltage is below its designed operating value.  
Check and correct the power line voltage.  
(Furnace) The line power voltage wiring is re-  
versed.  
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 recov-  
ered.  
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.  
table continued on next page  
506920−01 09/12  
Page 46  
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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.  
Table 5. Alert Codes and Troubleshooting  
Alert  
Code  
Priority  
Alert Text  
Steps to clear  
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  
115  
Critical  
Critical  
(Furnace / Air Handler) There is a frequency/  
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.  
(Furnace / Air Handler) The 24VAC to the (fur-  
nace 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 additional power−  
robbing equipment connected to system. This alarm/code may require the installation of an addition-  
al or larger VA transformer.  
117  
120  
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.  
Moderate  
(Stat / Furnace / Air Handler / Outdoor Unit)  
There is a delay in the (stat, furnace, air−handler  
or outdoor unit) responding 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 connec-  
tions. Cleared after unresponsive device responds to any inquiry.  
124  
125  
126  
Critical  
Critical  
Critical  
(Stat / Furnace / Air Handler / Outdoor Unit) The  
thermostat has lost communication with the (fur-  
nace, air−handler or outdoor 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.  
(Stat / Furnace / Outdoor Unit) There is a hard-  
ware problem on either the (stat, 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 operation and is  
persistent. The alarm/fault is cleared 300 seconds after the fault recovers.  
(Furnace / Outdoor Unit) There is an internal  
communication problem with the (furnace con-  
trol 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 sec-  
onds after the fault recovers.  
130  
131  
Moderate  
Critical  
(Air Handler) An air−handler configuration jump-  
er 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.  
(Stat / Furnace / Air Handler / Outdoor Unit) The  
(stat, furnace, air−handler or outdoor unit) con-  
trol parameters are corrupted.  
Reconfigure the system. Replace the control if heating or cooling is not available.  
132  
Critical  
(Air Handler) The air handler control software is  
corrupted.  
Recycle power. If failure re−occurs, replace the control. System reset is required to recover.  
table continued on next page  
icomfort Wi-Fi7−Day Programmable Communicating Thermostat  
Page 47  
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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.  
Table 5. Alert Codes and Troubleshooting  
Alert  
Code  
Priority  
Alert Text  
Steps to clear  
180  
Critical  
(Furnace / Air Handler / Outdoor Unit) The ther-  
mostat 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 temperature  
reading is lost. Compare outdoor sensor resistance to temperature/resistance charts in unit installa-  
tion 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), ap-  
propriate feature will be set as ’installed’ and shown in the ’About’ screen. The alarm/fault will clear  
upon configuration, or sensing normal values.  
200  
201  
Critical  
Critical  
(Furnace) The furnace rollout limit switch is  
open.  
Correct the cause of rollout trip. Reset rollout switch. Reset power to clear. Test the furnace opera-  
tion. The alarm/fault clears after the furnace rollout switch is closed.  
(Furnace / Air Handler) The system has lost  
communication with the (furnace or air−handler)  
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  
203  
Critical  
Critical  
(Furnace / Air Handler) The unit size code for  
the (furnace or air−handler) and the size of blow-  
er 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 thermostat from the system while apply-  
ing power and reprogramming.  
(Furnace / Air Handler) The unit size code for  
the (furnace or air−handler) has not been se-  
lected.  
No appliance unit size code selected. Check for proper configuring under: Unit Size Codes for Fur-  
nace/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  
205  
206  
207  
223  
Critical  
Critical  
Critical  
Critical  
Critical  
(Furnace) There is a problem with the furnace  
gas valve.  
Check gas valve operation and wiring. The alarm/fault clears after the issue is corrected.  
(Furnace) The furnace gas valve relay contact  
is closed.  
Check wiring on control and gas valve. The alarm/fault clears after the issue is corrected.  
(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.  
(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.  
(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  
225  
Critical  
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.  
(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.  
table continued on next page  
506920−01 09/12  
Page 48  
href="
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.  
Table 5. Alert Codes and Troubleshooting  
Alert  
Code  
Priority  
Alert Text  
Steps to clear  
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  
228  
229  
240  
Moderate  
Moderate  
Minor  
(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.  
(Furnace) The furnace control is not able to cali-  
brate 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 success-  
ful calibration.  
(Furnace) The furnace control has switched to  
high fire ignition because the low fire pressure  
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.  
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  
250  
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.  
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 ductwork.  
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.  
252  
270  
271  
Moderate  
Critical  
(Furnace) The furnace discharge air−tempera-  
ture 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.  
(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 current. Check  
for dirty filters. The alarm/fault will clear on successful ignition.  
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  
273  
274  
Critical  
Critical  
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. Measure operat-  
ing pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restric-  
tion. The alarm/fault will clear when a heat call ends successfully.  
(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. Mea-  
sure voltage of neutral to ground to ensure good unit ground. The alarm/fault will clear when a heat  
call ends successfully.  
(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 blockage. The  
alarm/fault will clear when a heat call ends successfully.  
table continued on next page  
icomfort Wi-Fi7−Day Programmable Communicating Thermostat  
Page 49  
href="
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.  
Table 5. Alert Codes and Troubleshooting  
Alert  
Code  
Priority  
Alert Text  
Steps to clear  
275  
Critical  
(Furnace) The furnace flame is out of sequence.  
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 calibrate 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  
291  
292  
Critical  
Critical  
Critical  
(Furnace) 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 ignitor it is not within specifications. The alarm/fault will clear on next successful ignition.  
(Furnace) The heating airflow is below the mini-  
mum required level.  
The system will go into Watchguard mode. Check for dirty filters and other air flow restrictions. Check  
blower performance. The alarm/fault will clear when a heat call ends successfully.  
(Furnace / Air Handler) The (furnace or air−han-  
dler) 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 assembly does not operate or  
meet performance standards. The alarm/fault clears after the indoor blower motor starts successfully.  
294  
Critical  
(Furnace) There is over current in the furnace  
inducer motor.  
The system will go into Watchguard mode. Check combustion blower bearings, wiring and amps.  
Replace if does not operate or does not meet performance standards. The alarm/fault clears after  
inducer current is sensed to be in−range after the ignition following the Watchguard mode or reset.  
295  
310  
Minor  
(Furnace) The indoor blower motor is over heat-  
ing.  
Indoor blower motor over temperature (motor tripped on internal protector). Check motor bearings  
and amps. Replace if necessary. The alarm/fault clears after blower demand is satisfied.  
Critical  
(Furnace / Air Handler) There is a problem with  
(furnace or air−handler) discharge air sensor.  
Compare outdoor sensor resistance to temperature/resistance charts in installation instructions.  
Replace sensor if necessary. The alarm/fault is cleared 30 seconds after fault is detected as recov-  
ered.  
311  
312  
Minor  
Minor  
(Furnace) The heat firing rate has been reduced  
to match available airflow (cutback mode).  
Warning Only. Furnace blower in cutback mode due to restricted airflow. Reduce firing rate every 60  
seconds to match available CFM. Check filter and duct system. To clear, replace filter if needed or  
repair/add duct. 2−stage controls will reduce firing rate to 1st stage. The alarm/fault clears when a  
heat call finishes successfully.  
(Furnace / Air Handler) The blower cannot pro-  
vide the requested CFM due to high static.  
Warning Only. Restricted airflow − 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 filter  
and duct system. To clear, replace filter if needed or repair/add duct. The alarm/fault is cleared after  
the current service demand is satisfied.  
313  
344  
Minor  
(Furnace / Air Handler) The indoor and outdoor  
unit capacities do not match.  
Check for proper configuring in installation instructions. Alarm is just a warning. The system will  
operate, but might not meet efficiency and capacity parameters. The alarm will clear after commis-  
sioning is complete.  
Critical  
(Furnace) Relay Y1 Failure  
Y1 relay failed; operation stopped. Alarm clears 300 seconds after Y1 input sensed OFF.  
table continued on next page  
506920−01 09/12  
Page 50  
href="
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.  
Table 5. Alert Codes and Troubleshooting  
Alert  
Code  
Priority  
Alert Text  
Steps to clear  
345  
Critical  
(Air Handler) The ꢁO" relay on the air−handler  
has failed. Either the pilot relay contacts did not  
close or the relay coil did not energize.  
O relay / Stage 1 failed. Pilot relay contacts did not close or the relay coil did not energize. Replace  
control. Cleared after the fault recovered following reset.  
346  
347  
Critical  
Critical  
(Air Handler) The heat pump jumper was not  
removed on the air−handler control board.  
Configuration link(s) not removed on control. Cut O−R. Applicable with non communicating outdoor  
unit with communicating indoor system.  
(Furnace / Air Handler) The ꢁY1" relay on the  
(furnace or air−handler) has failed. Either the  
pilot relay contacts did not close or the relay  
coil did not energize.  
Operation stopped. Y1 relay / Stage 1 failed. (Pilot relay contacts did not close or  
the relay coil did not energize; no input back to IFC chip). Critical Alert. Cleared after reset and Y1  
input sensed.  
348  
Critical  
(Furnace / Air Handler) The ꢁY2" relay on the  
(furnace or air−handler) has failed. Either the  
pilot relay contacts did not close or the relay  
coil did not energize.  
Y2 relay / Stage 2 failed. (Pilot relay contacts did not close or the relay coil did not energize; no input  
back to IFC chip). Critical Alert. Cleared after reset and Y1 input sensed.  
349  
350  
Critical  
Critical  
(Furnace) The ꢁO" to ꢁR" jumper on the furnace  
needs to be restored.  
Configuration link R to O needs to be restored. Replace link or hard−wire. Applicable in non commu-  
nicating mode. Critical Alert.  
(Air Handler) The air−handler’s electric heat is  
not configured.  
Heat call with no configured or mis−configured electric heat. Check for proper configuring under  
Configuring Electric Heat Stages in the air handler installation instructions. Cleared after electrical  
heat detection is successful.  
351  
352  
Critical  
Critical  
(Air Handler) There is a problem with the air−  
handler’s 1st stage electric heat. Either the pilot  
relay contacts did not close, or the relay coil in  
the electric heat section did not energize.  
Heat section / Stage 1 failed. (Pilot relay contacts did not close, or the relay coil in the electric heat  
section did not energize.) Air handler will operate on 1st stage for reminder of the heat call. Will clear  
after fault recovered.  
(Air Handler) There is a problem with the air−  
handler’s 2nd stage electric heat. Either the pi-  
lot relay contacts did not close, or the relay coil  
in the electric heat section did not energize. The  
air−handler will operate on 1st stage electric  
heat until the issue is resolved.  
Heat section / Stage 2 failed (Same as Code 351).  
Heat section / Stage 3 failed (Same as Code 351).  
table continued on next page  
353  
Critical  
(Air Handler) There is a problem with the air−  
handler’s 3rd stage electric heat. Either the pilot  
relay contacts did not close, or the relay coil in  
the electric heat section did not energize. The  
air−handler will operate on 1st stage electric  
heat until the issue is resolved.  
icomfort Wi-Fi7−Day Programmable Communicating Thermostat  
Page 51  
href="
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.  
Table 5. Alert Codes and Troubleshooting  
Alert  
Code  
Priority  
Alert Text  
Steps to clear  
354  
Critical  
(Air Handler) There is a problem with the air−  
handler’s 4th stage electric heat. Either the pilot  
relay contacts did not close, or the relay coil in  
the electric heat section did not energize. The  
air−handler will operate on 1st stage electric  
heat until the issue is resolved.  
Heat section / Stage 4 failed (Same as Code 351).  
355  
Critical  
(Air Handler) There is a problem with the air−  
handler’s 5th stage electric heat. Either the pilot  
relay contacts did not close, or the relay coil in  
the electric heat section did not energize. The  
air−handler will operate on 1st stage electric  
heat until the issue is resolved.  
Heat section / Stage 5 failed (Same as Code 351).  
370  
400  
401  
Critical  
(Furnace) The furnace control board has not  
received 24VAC power for 2 minutes or more.  
Control sees the loss of 24VAC for 2 minutes .Terminate all services and wait for interlock switch to  
close. The alarm will clear when 24VAC is continuously sensed on DS terminal for a minimum of 10  
seconds or on a power reset. If 2 stage with float switch, the IFC control R−DS is open.  
Critical  
(Outdoor Unit) The compressor internal over-  
load has tripped.  
Thermostat demand Y1 is present; but, compressor is not running. Check power to unit. Clears the  
error after current is sensed in both RUN and START sensors for at least 2 seconds, or after service  
is removed, or after power reset.  
Moderate  
(Outdoor Unit) Either the compressor ran for  
more than 18 hours continuously trying to cool  
the home or the refrigerant pressure in the sys-  
tem is low.  
Compressor ran more than 18 hours to satisfy a single thermostat demand. Will not lockout system.  
if 2 stage, units with blinking LED light controls, unit will run in low speed; units with 7−segment  
display will display code, but continue to run in high speed. If a Heat Pump, and if outdoor temp is  
less than 65 degrees, code is ignored. Clears the error after 30 consecutive normal run cycles or  
power reset. Also monitors low pressure switch trips.  
402  
Critical  
(Outdoor Unit) Either the discharge or suction  
pressure level is out−of−limits, or the is compres-  
sor overloaded.  
Discharge or suction pressure out−of−limits, or compressor overloaded. Clears the error after 4 con-  
secutive normal compressor run cycles.  
403  
404  
Moderate  
Critical  
(Outdoor Unit) The compressor ran for less than  
3 minutes to satisfy a thermostat demand.  
Compressor runs less than 3 minutes to satisfy a thermostat demand. Clears the  
error after 4 consecutive normal run cycles or power reset.  
(Outdoor Unit) The compressor rotor is locked  
up. This could be due to a short circuiting of the  
run capacitor, seizing of the bearings or exces-  
sive liquid refrigerant etc.  
Compressor rotor locked up due to run capacitor short, bearings are seized, excessive liquid refriger-  
ant, etc. (NOTE: May need to install hard start kit). Clears the error after 4 consecutive normal run  
cycles or after power reset.  
405  
406  
Critical  
Critical  
(Outdoor Unit) The compressor circuit is open.  
This could be due to a power disconnection,  
open fuse etc.  
Compressor circuit open (due to power disconnection, open fuse, etc.) Clears the  
error after 1 normal compressor run cycle.  
(Outdoor Unit) The required amount of current is  
not passing through the start current transform-  
er.  
Required amount of current is not passing through Start current transformer. Clears the error after  
current is sensed in START sensor, or after power reset.  
table continued on next page  
506920−01 09/12  
Page 52  
href="
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.  
Table 5. Alert Codes and Troubleshooting  
Alert  
Code  
Priority  
Alert Text  
Steps to clear  
407  
Critical  
(Outdoor Unit) The required amount of current is  
not passing through run current transformer.  
Required amount of current is not passing through Run current transformer. Clears the error after  
current is sensed in RUN sensor, or 1 normal compressor run cycle, or after power reset  
408  
409  
Critical  
(Outdoor Unit) The compressor is running con-  
tinuously.  
Compressor runs continuously. Clears the error after 1 normal compressor run  
cycle or after power reset.  
Moderate  
(Furnace / Air Handler / Outdoor Unit) The sec-  
ondary voltage for the (furnace, air−handler or  
outdoor unit) has fallen below 18VAC. If this  
continues for 10 minutes, the thermostat will  
turn off the (furnace, air−handler or outdoor unit).  
Secondary voltage is below 18VAC. After 10 minutes, operation is discontinued.  
Clears the code after voltage is higher than 20 VAC for 2 seconds or after power  
reset.  
410  
411  
Moderate  
Critical  
(Outdoor Unit) The outdoor unit pressure is be-  
low the required limit.  
Unit pressures are below the lower limit. Pressure switch opens at 40 psig (system shuts down) and  
closes at 90 psig (system restarts).  
(Outdoor Unit) The low pressure switch has  
opened 5 times during one cooling cycle. As a  
result, the thermostat has shutdown the outdoor  
unit.  
Open low pressure switch error count reached 5 strikes. Check system charge using approach and  
sub cooling temperatures. Reset by putting outdoor unit control in test mode or resetting low voltage  
power.  
412  
413  
Moderate  
Critical  
(Outdoor Unit) The outdoor unit pressure is  
above the required limit. The system will shut  
down.  
Unit pressure is above the upper limit. Pressure switch opens at 590 psig (system shuts down) and  
closes at 418 psig (system restarts).  
(Outdoor Unit) The high pressure switch has  
opened 5 times during one cooling cycle. As a  
result, the thermostat has shutdown the outdoor  
unit.  
Open high pressure switch error count reached 5 strikes. Check system charge  
using approach and sub cooling temperatures. Check outdoor fan operation. Check for dirt or debris  
blocking air flow to outdoor unit. Reset by putting outdoor unit control in test mode or resetting low  
voltage power.  
414  
415  
416  
Critical  
Critical  
Critical  
(Outdoor Unit) The discharge line temperature  
is higher than the recommended upper limit of  
279ºF.  
Discharge line temperature is > 279ºF. Make sure coil is clean and airflow unobstructed in and out of  
condenser. Check system operating pressures and compare to unit charging charts in installation  
manual. Clears after discharge temperature is < 225ºF.  
(Outdoor Unit) The discharge line temperature  
has been consistently higher than the recom-  
mended upper limit of 279ºF.  
Discharge line high temperature error count reached 5 strikes. Make sure coil is clean and airflow  
unobstructed in and out of condenser. Check system charge using approach and sub cooling tem-  
peratures. Reset by putting outdoor board in test mode or resetting low voltage power.  
(Outdoor Unit) The outdoor coil sensor is either  
open, short−circuited or the temperature is out of  
sensor range. As a result the outdoor unit con-  
trol will not perform any defrost tempering.  
Sensor being detected open or shorted, or temperature is out of sensor range.  
Outdoor unit control will not perform demand or time/temperature defrost operation. (System will still  
heat or cool.) Clears when outdoor unit control detects proper sensor readings.  
417  
Critical  
(Outdoor Unit) The outdoor unit sensor is either  
open, short−circuited or the temperature is out of  
sensor range. As a result the outdoor unit con-  
trol will not perform any defrost tempering.  
Outdoor unit control detects open or shorted sensor, or temperature that is out of sensor range.  
Critical Alert after 10 minutes. Reset by replacing sensor. 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 board will count one fault. After 5 faults, the board will lock out. Check for  
proper sensor reading and attachment to line. Replace if out−of−specifications.  
table continued on next page  
icomfort Wi-Fi7−Day Programmable Communicating Thermostat  
Page 53  
href="
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.  
Table 5. Alert Codes and Troubleshooting  
Alert  
Code  
Priority  
Alert Text  
Steps to clear  
418  
Moderate  
(Outdoor Unit) There is a faulty ꢁW" output cir-  
cuit.  
Faulty W output circuit.  
419  
420  
Critical  
Critical  
(Outdoor Unit) The ꢁW" output on the outdoor  
unit has reported more than 5 errors. As a re-  
sult, the system has shutdown the outdoor unit.  
W output hardware fault count reached 5 strikes.  
(Air Handler) The heat pump defrost cycle has  
taken more than 20 minutes to complete.  
Defrost cycle lasts longer than 20 minutes. Check heat pump operation. Cleared  
when W1 signal is removed. Applicable only in communicating mode with non−communicating heat  
pump.  
421  
700  
701  
702  
703  
704  
705  
Critical  
(Outdoor Unit) The ꢁW" output terminal on the  
outdoor unit is not wired correctly.  
Voltage sensed on W output terminal when Y1 out is deactivated.  
Moderate  
Moderate  
Moderate  
Moderate  
Moderate  
Moderate  
(Stat) The temperature sensor in the thermostat  
is not working properly.  
Recalibrate thermostat to clear. Replace thermostat if needed.  
(Stat) The thermostat is reading indoor tempera-  
tures above the pre−programmed limit.  
Recalibrate thermostat to clear; cool thermostat; adjust setpoint. Replace thermostat, if needed.  
Recalibrate thermostat to clear; warm thermostat; adjust setpoint. Replace thermostat, if needed.  
Recalibrate thermostat to clear; adjust setpoint. Replace thermostat, if needed.  
Recalibrate thermostat to clear. Replace thermostat, if needed.  
(Stat) The thermostat is reading indoor tempera-  
tures below the pre−programmed limit.  
(Stat) The humidity sensor in the thermostat is  
not working properly.  
(Stat) The thermostat is reading indoor humidity  
levels above the pre−programmed limit.  
(Stat) The thermostat is reading indoor humidity  
levels below the pre−programmed limit.  
Recalibrate thermostat to clear. Replace thermostat, if needed.  
Ohm reading between i+ and i− anywhere on the RSBus with supply power off should be between 70  
and 90 ohms. If above 90 ohms, check and repair wiring, splices or other wiring defects that may be  
causing the excessive resistance. If less than 70 ohms, check for shorted wires.  
Ohm  
Check  
The ohm reading in the system is either too  
high or too low.  
Homeowner Service Alert Codes8  
Number  
3000  
Value  
Number  
3002  
Value  
Number  
3004  
Value  
Number  
Value  
Number  
Value  
Filter 1  
Filter 2  
Humidifier Pad  
UV Light  
Maintenance  
4000  
User WiFi state change, disable  
Firmware download failed  
4002  
Image file download failed  
3001  
3003  
3005  
PureAir Maintenance 4001  
506920−01 09/12  
Page 54  
 
href="
Bold text indicates a button, or text display on the thermostat.  
Table 6. Troubleshooting Tips  
No.  
1
Issue / Problem  
Possible Cause  
Corrective Action / Comments  
− No electric heat operation.  
− The thermostat system setting  
does not offer a emerg. heat choice  
on an HP system.  
− The thermostat does not offer any  
ꢁheat" choice on an AC system with  
air handler with electric heat.  
Electric heat was not manually  
configured configured at the Air  
Handler Control (AHC) before the  
icomfort Wi-Fisystem discov-  
ery process at initial power−up.  
− Manually configure to discover the electric heat section(s) on the air  
tails).  
− Re−setup the icomfort system by selecting the setup button in the  
Installer program and press start to begin system discovery; then  
reconfigure the system.  
2
Thermostat Displays System Wait-  
ing message and the furnace does  
respond to a heating demand (no red  
critical alert icon or alert messages  
are displayed on the thermostat).  
The furnace is in ꢁwatchguard"  
mode (moderate alert) and will  
not display the red critical alert  
icon nor be displayed in the  
homeowner alert button.  
− Go to the installer program alert button to view all alerts and details  
about those alerts.  
− If the furnace is in ꢁwatchguard" mode, the furnace can be reset from  
the Home screen by setting the thermostat system settings to off  
for 20 sec, then back to heat. Then initiate a new heat demand.  
3
4
Outdoor temperature is not displayed  
on the thermostat.  
Outdoor Temp Display must be  
enabled to display the outdoor  
temperature on the home screen.  
On the home screen, press the right arrow  
then press the display settings button. Click on outdoor temp dis-  
play button to toggle ON.  
A humidifier was added to the system  
as non−communicating equipment  
and the thermostat does not provide  
the ability to adjust the RH setpoint.  
Humidification Control Mode is  
set for ꢁDisplay only" which will  
not allow the icomfort system to  
control the humidifier.  
− In the installer program, select the equipment button. Select ꢁSys-  
tem" from the device list using the up/down arrows and press the edit  
button. Use up/down arrows to select Humidification Control Mode  
from the list. Select the desired humidifier control mode: Basic, Preci-  
sion, or Dew Point. (Basic is the most popular) and press the save  
button. Follow the red instructions then exit the system.  
− If Humidification Control Mode is not offered as a menu item  
choice, the Humidifier must be added to the icomfort system using  
the Add or Remove Non−communicating equipment screen under  
the thermostat installer program in the setup button.  
5
The non−communicating outdoor unit  
is part of the system, but the thermo-  
stat does not display the outdoor unit.  
The outdoor unit was not added  
as a non−communicating unit dur-  
ing initial system setup.  
In the thermostat installer program select the setup button and follow  
the on screen instructions until you reach the Add or Remove Non−  
communicating equipment screen; press yes. Select Outdoor Unit  
Type from the menu and press the edit button. Select 1 Stage AC Unit  
or 2 Stage AC Unit and press save. Follow the red instructions then  
exit the system.  
table continued on next page  
icomfort Wi-Fi7−Day Programmable Communicating Thermostat  
Page 55  
 
href="
Bold text indicates a button, or text display on the thermostat.  
Table 6. Troubleshooting Tips  
No.  
6
Issue / Problem  
Possible Cause  
Corrective Action / Comments  
High Balance Point and Low Bal-  
ance Point are not listed as a menu  
item to adjust the setpoint on the ther-  
mostat of the heat pump system.  
Balance Point Control must be  
enabled to display as the High  
Balance Point and Low Bal-  
ance Point in the menu and pro-  
vide the ability for the installer to  
adjust the setpoint.  
− In the installer program select the equipment button, then scroll  
down to system device to System and press edit. Scroll down the  
menu item choices to Balance Point Control and press edit. Select  
enable and press save. High Balance Point and Low Balance  
Point are now listed; adjust the balance point settings and press  
save.  
− If Balance Point Control is not shown as a menu item choice, the  
system is not connected to Wi−Fi or does not have/recognize an  
outdoor sensor or the system is not a heat pump.  
7
icomfort thermostat does not show a  
choice for Dew Point Control Hu-  
midification mode (only Basic and  
Precision choices).  
Dew Point Control will only be  
displayed if the system has an  
outdoor sensor.  
− Add an outdoor sensor to the system and connect to the outdoor  
sensor terminals on the indoor unit.  
− icomfort system is not able to read the outdoor temperature sensor in  
the icomfort outdoor unit, check outdoor sensor.  
8
9
The icomfort does not display an alert  
code message, but the furnace or unit  
control displays a diagnostic code.  
The red Critical Alert icon and  
homeowner alert button do not  
display non−critical alerts.  
Go to the installer program alert button to view all alerts and details  
about those alerts.  
The icomfort thermostat does not dis-  
play the Model # and or Serial # in-  
door or outdoor unit.  
The icomfort control was re-  
placed with a replacement control  
before the icomfort system was  
initially setup or configured.  
− Replacement icomfort controls do not have the Model # or Serial #  
loaded in the control.  
− The Model # and Serial # cannot be added to the control.  
− System will still operate normally.  
10  
11  
A non−communicating 2−stage out-  
door unit was added to the system  
but the unit only runs in 2nd stage.  
The ꢁW915 2 Stage Compr" clip-  
pable option link on the furnace  
or air handler control must be cut  
when used with a non−communi-  
cating 2−stage outdoor unit.  
Cut the ꢁW915 2 Stage Compr" option link on the furnace or air handler  
control.  
Transfer the Model #, Serial # and  
system settings to a replacement  
control.  
The icomfort system is capable  
of copying settings from the pre-  
vious configuration to the new  
compatible device (control)  
found.  
Reconfigure the system using the installer program and select the  
setup button. The system will go through the system discovery pro-  
cess. The thermostat will display missing devices (old control) and  
found compatible devices (new control). Press the next button to  
accept the new device and copy the settings. Thermostat will display  
Settings were copied after successfully copying the information to the  
new control. See section title ꢁReconfiguring a system" in this manual.  
table continued on next page  
506920−01 09/12  
Page 56  
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Bold text indicates a button, or text display on the thermostat.  
Table 6. Troubleshooting Tips  
No.  
12  
Issue / Problem  
Possible Cause  
Corrective Action / Comments  
Determine the actual Software ver-  
sion of the thermostat or one of the  
icomfort unit controls.  
icomfort software is stored in the  
control and can be retrieved.  
From the home screen click the right arrow  
then click service info button; then click the thermostat info button;  
(display shows model & serial numbers and hardware, software, Wi−Fi  
revision information).  
13  
The icomfort thermostat shows an er-  
ror code related to the outdoor sensor  
and or the DAS even after removing  
these optional accessories.  
The outdoor sensor and dis-  
charge sensor are options, how-  
ever if the system was setup with  
the sensor in place, the icomfort  
system will see an open sensor  
reading if it is disconnected.  
− Disconnect the outdoor sensor or discharge sensor.  
− Using the installer program, reset the system by selecting setup  
button and follow the screen prompts as the thermostat goes through  
a new system discovery.  
14  
15  
The icomfort thermostat will not pro-  
vide me a choice to add a non−com-  
municating heat pump to a gas fur-  
nace.  
The icomfort system does not  
have the ability to control a non−  
communicating heat pump on a  
dual fuel system.  
Replace the icomfort thermostat with a conventional thermostat that  
has a dual fuel control mode (e.g. Lennox ComfortSense7000).  
During system discovery, the ther-  
mostat displays a message Thermo-  
stat is unable to communicate to  
system components.  
The thermostat was not success-  
ful in communicating to the indoor  
unit.  
Verify the indoor unit has a icomfort communicating control.  
− Check wiring connections at R, i+, i− and C at the indoor unit and  
thermostats.  
− Check R, i+. I− , C wires for open/shorts.  
16  
17  
Temperature or humidity calibration  
does not respond to calibration  
changes.  
Temperature/Humidity calibration  
changes will change display 1ºF  
or 1% RH every 3 minutes.  
Allow the system to stabilize and complete the calibration mode due to  
the time delay. A 5ºF calibration change will take 15 minutes to calibrate  
the display.  
The installer adjustable settings used  
to configure the system are not listed  
in the equipment button under the  
Thermostat 49W95 (only Temp  
Reading Calibration and Humidity  
Reading Calibration are listed as  
menu items).  
The adjustable system configura-  
tion settings are listed in the  
equipment button under Sys-  
tem.  
− In the installer program select the equipment button and choose  
System from system device and press edit.  
− Over 25 installer adjustable settings are provided including balance  
point, humidification control, dehumidification modes, stage differen-  
tials and delays.  
table continued on next page  
icomfort Wi-Fi7−Day Programmable Communicating Thermostat  
Page 57  
href="
Bold text indicates a button, or text display on the thermostat.  
Table 6. Troubleshooting Tips  
No.  
18  
Issue / Problem  
Possible Cause  
Corrective Action / Comments  
During the cooling mode the dis-  
played air volume on the indoor con-  
trol is substantially lower than ex-  
pected.  
The system may be following ꢁthe  
cooling ramping" profile or may  
be in ꢁthe dehumidification  
mode".  
− During the default cooling ramping profile the blower will run for 7.5  
minutes at 82% of the cooling air volume. If the ꢁcooling ramping  
profile" is selected, the system will ramp to 100% after 7.5 minutes.  
− The dehumidification mode will run the system at 70% of the cooling  
air volume which will be in addition to the air volume reduction pro-  
vided during the ramping profile. During the dehumidification mode, a  
d" will be displayed on the furnace or air handler control.  
19  
20  
The Indoor unit is not providing the  
expected air volume according to the  
cfm shown on the indoor unit control.  
− Indoor unit air volume settings  
in the icomfort thermostat are  
not correct.  
− System is operating in the cool-  
ing mode and following the  
cooling ramping profile or dehu-  
midification air volume.  
− In the installer program select the equipment button and choose the  
furnace or air handler from the system devices list and press edit.  
Verify/set the correct air volume for heating and cooling modes.  
− If in the cooling mode check for cooling ramp mode or dehumidifica-  
tion mode as in #18.  
− No second stage cooling is pro-  
vided on a icomfort outdoor unit.  
− Space temperature is above second  
stage differential and has run in first  
stage a long time.  
The red Critical Alert icon and  
homeowner alert button do not  
display non−critical alerts.  
− Go to the installer program alert button to view all alerts and details  
about those alerts.  
− Look for alert code 401 (Compressor Long On Cycle) which indicates  
compressor ran more than 18 hours continuous and will lock out 2nd  
stage compressor.  
− No red Critical Alert icon or alert is  
displayed in the homeowner alert  
button.  
− Cycle indoor power off and back on, alert code 401 will clear within a  
few minutes.  
21  
22  
No weather being displayed.  
icomfort Wi-Finot communicat-  
ing with router.  
Unable to complete Wi−Fi router / in-  
ternet connection  
Refer to 507037−01 Wi−Fi Troubleshooting checklist for icomfort Wi−Fit thermostat.  
506920−01 09/12  
Page 58  
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Wiring Diagrams  
icomfortCommunicating System Wiring  
icomfort by Lennoxꢁ  
FURNACE (IFC) OR AIR HANDLER (AHC)  
DAS NOTE − The discharge air sensor is  
intended to be mounted downstream of the  
furnace heat exchanger and air conditioning  
coil. It must be placed in free airflow, where  
other accessories (such as humidifiers, UV  
lights, etc.) will not interfere with its accura-  
cy. Wiring distance between the IFC or AHC  
OPTIONAL DIS-  
CHARGE AIR SEN-  
SOR (SEE DAS  
NOTE)  
OPTIONAL OUT-  
DOOR AIR SENSOR  
(SEE OAS NOTE)  
and the discharge air sensor should not ex-  
ceed 10ft when wired with 18−gauge ther-  
mostat wire.  
OAS NOTE − Wiring distance between the  
IFC or AHC and the outdoor temperature  
sensor should not exceed 200ft when wired  
with 18−gauge thermostat wire.  
icomfort Wi-Fiꢁ  
THERMOSTAT  
icomfort by Lennoxꢁ  
OUTDOOR AIR CON-  
DITIONING OR HEAT  
PUMP UNIT  
RSBus  
RSBus  
icomfort Wi-FiThermostat  
icomfort by LennoxIndoor Furnace or Air Handler  
Maximum total length of all connections on  
the RSBus is limited to 1500ft.  
icomfort by LennoxOutdoor Condensing Unit or Heat Pump  
Wire gauge of RSBus wire is 18.  
icomfort Wi-Fi7−Day Programmable Communicating Thermostat  
Page 59  
 
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Wiring Diagrams  
icomfortCommunicating Indoor/non−Communicating Outdoor System Wiring  
icomfort by LennoxAIR HANDLER (AHC)  
icomfort by LennoxFURNACE (IFC) OR AIR HANDLER (AHC)  
OPTIONAL DIS-  
CHARGE AIR SEN-  
SOR (SEE DAS  
OPTIONAL DIS-  
CHARGE AIR SEN-  
SOR (SEE DAS  
OPTIONAL OUT-  
DOOR AIR SENSOR  
(SEE OAS NOTE  
OPTIONAL OUT-  
DOOR AIR SENSOR  
(SEE OAS NOTE  
icomfort Wi-Fiꢁ  
THERMOSTAT  
Setup Notes:  
icomfort Wi-Fiꢁ  
THERMOSTAT  
Cut Y1−Y2 Onboard Link  
For 2−stage Outdoor  
Units  
Cut R−O Onboard Link  
For Outdoor Heat Pump  
Units  
RSBus  
RSBus  
Maximum total  
length of all connec-  
tions on the RSBus  
is limited to 1500ft.  
Maximum total  
length of all connec-  
tions on the RSBus  
is limited to 1500ft.  
STANDARD  
OUTDOOR AIR  
CONDITIONING  
UNIT − 1 OR 2  
STAGE  
STANDARD  
OUTDOOR HEAT  
PUMP UNIT − 1  
OR 2 STAGE  
Wire gauge of  
RSBus wire is 18.  
Wire gauge of  
RSBus wire is 18.  
icomfort Wi-Fiꢁ  
Thermostat  
Setup Note:  
icomfort by LennoxAir  
Handler  
Cut Y1−Y2 Onboard  
Link For 2−stage  
Outdoor Units  
Standard Outdoor Heat  
Pump  
icomfort Wi-FiThermostat  
icomfort by LennoxIndoor Furnace or Air Handler  
Standard Outdoor Condensing Unit  
506920−01 09/12  
Page 60  
href="
Optional Accessories Wiring  
for use with any icomfort by Lennoxsystem  
NOTE: icomfort Wi-FiTHERMOSTAT SENSES HUMIDITY & CONTROLS 24V ꢁH" OUTPUT (& 120V ꢁH" OUT-  
PUT) TO CYCLE HUMIDIFIER BASED ON DEMAND. NO OTHER CONTROL OR HUMIDISTAT REQUIRED.  
icomfort by Lennox  
SLP98 & G71MPP FURNACE  
(IFC) OR AIR HANDLER (AHC)  
OPTIONAL OUTDOOR AIR SENSOR FOR USE WITH HUMIDIFIER (IF NOT ALREADY IN THE SYSTEM FOR  
OTHER FUNCTIONS. BUILT INTO ALL icomfort by LennoxOUTDOOR UNITS). (SEE OAS NOTE Page 59)  
DISCHARGE AIR SEN-  
SOR (REQUIRED FOR  
EVEN HEAT) (SEE DAS  
HCWH−01  
For SL290 & EL296, see HUMIDIFIER diagram  
DEHUMIDIFIER CONTROL  
below (bottom right)  
icomfort Wi-Fi  
THERMOSTAT  
HVAC  
EQUIPMENT  
RSBus  
AUXILIARY DEHUMIDIFIER 090 & 135  
capacities only (065 not compatible)  
Maximum total  
icomfort by Lennox  
SL280, EL296 FURNACE  
length of all connec-  
tions on the RSBus  
is limited to 1500ft.  
icomfort  
Wi-Fiꢁ  
thermostat  
Wire gauge of  
RSBus wire is 18.  
NOTE: 24V UV LIGHT  
APPLICATIONS  
icomfort  
enabled  
outdoor unit  
In an icomfort by Lennox  
system, neither furnace nor  
air handler transformer will  
have adequate VA to power  
24V UV light applications.  
An additional transformer for  
UV light applications is re-  
quired. UV light wiring con-  
nections are independent of  
HVAC system operation; see  
UV light installation instruc-  
tions.  
48G96 Relay  
GND  
IN  
120VAC<−−−−−−−HUMIDIFIER CONNECTIONS−−−−−−> 24VAC  
icomfort Wi-Fi7−Day Programmable Communicating Thermostat  
Page 61  
 
href="
Optional Accessories Wiring  
for use with any icomfort by Lennoxsystem  
icomfort by Lennoxꢁ  
2−STAGE FURNACE  
icomfort by Lennox  
SLP98 & G71MPP FURNACE  
(IFC) OR AIR HANDLER (AHC)  
LVCS Ventilation Control System  
icomfort by  
Lennoxꢁ  
Furnace or  
Air Handler  
icomfort by  
Lennoxꢁ  
Outdoor Air  
Conditioning  
or Heat Pump  
DS  
CUT  
R−DS  
W914  
R
icomfort Wi-Fiꢁ  
Thermostat  
(POWER COMPANY INTERRUPTION  
SYSTEMS ARE WIRED SAME AS  
OVERFLOW SWITCH)  
RSBus  
Standard 1  
or 2 stage  
AC or HP  
unit  
icomfort by Lennoxꢁ  
Furnace or Air Handler  
HEPA Bypass Filter X2680 HEPA Interlock Kit  
26L56 Currrent sensing relay kit.  
Pass indoor  
blower motor  
common wire  
through cur-  
rent loop.  
NOTE: Pass the blower motor L1 wire through the current loop  
on the current sensing relay as shown.  
HVAC Heat or Cool call, or the fan is in continuous operation, the ventilation controller will open  
OA damper to ventilate if the outdoor temperature and indoor humidity are within the limits of the  
ventilation controller.  
See HEPA In-  
terlock Kit for  
installation  
details  
icomfort by Lennoxꢁ  
Furnace or Air Handler  
LVCS. Set cycle time to 1 hour; set ventilation time to 60 minutes.  
NOTE: Use the icomfortcirculate fan percentage of ON* TIME to control ventilation time.  
506920−01 09/12  
Page 62  
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Thermostat wire termination in communicating system  
Outdoor Unit  
Indoor Unit  
Controller  
icomfort Wi-Fi  
thermostat  
Single wire to  
terminal C  
Single wire to  
terminal C  
Unused wires  
Unused wires  
Communicating systems using the icomfort Wi-Fithermostat require four  
thermostat wires between the thermostat and the furnace/air handler control  
and four wires between the outdoor unit and the furnace/air handler control.  
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 the diagram above.  
This is not an issue in non−communicating systems.  
icomfort Wi-Fi7−Day Programmable Communicating Thermostat  
Page 63  
 
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Configuring heat strips on Air Handler Control (AHC)  
IMPORTANT: After electric heat strips are installed, the Air Handler Control  
(AHC) must be manually configured to detect the number of electric heat  
sections. (SEE ALSO 506181−01 for complete configuration guide.)  
FUSE 3 AMP  
HEAT  
HUMIDITROL  
1
2
2
2
3 4  
C
DH  
XFMR 24V  
HUMIDIFICATION  
COOL  
To configure the heat strips so that they will be detected by the thermostat:  
24 VAC  
COM  
1
3
4
AUTO  
SMART  
Power must be applied to the air handler but NOT to the thermostat.  
Remove thermostat from baseplate or remove wires to thermostat at  
the air handler.  
EVENHEAT  
DELAY  
DS  
O
1
3 4  
1
4
7
3
2
P8  
On the air handler control (AHC), unit should be in idle mode (decimal  
blinks at 1 Hertzꢀ0.5 second ON, 0.5 second OFF.  
BLOWER  
ONLY CFM  
6
9
5
8
L
ADJUST  
H
NORM  
+
Select field test modeꢀpress and hold the pushbutton until solid ꢁ–"  
appears; release button. Display will blink.  
1
2 3 4  
DH  
R
C
Press the pushbutton and wait for the display LED to show ꢁH" (capital  
H), then release the button.  
XFMR LINE  
L2  
Y1  
Y2  
L1  
The AHC 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 AHC stores the num-  
ber of electric heat sections, then automatically exits ꢁField Test  
Mode".  
G
A92  
INTEGRATED  
CONTROL  
INDOOR  
BLOWER  
POWER  
L2 L1  
G
W3  
W2  
W1  
EARTH  
INDOOR BLOWER  
SIGNAL  
At this point, the icomfortWi-Fiwill now detect the heat strip informa-  
tion stored in the AHC.  
4
6
5
1
2
3
R
I + I  
C
OUTDOOR  
AIR SENSOR AIR SENSOR  
DISCHARGE  
R
I + I −  
C
OUTDOOR UNIT  
I + I −  
LINK  
THERMOSTAT  
PUSHBUTTON  
LED  
506920−01 09/12  
Page 64  
 
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Setting up typical systemsꢁFURNACE & AIR CONDITIONING UNIT  
icomfort−enabled furnace & icomfort−enabled air conditioner  
An icomfort−enabled gas furnace (G71MPP, EL296V, SLP98, SL280) with  
an icomfort−enabled AC (XC17 or XC21 only) unit.  
save either way. The red settings will go away after pressing save.  
When all CFM settings are complete, press the back button. Press  
next step to advance to the tests button.  
1. WiringꢀSee Communicating System Wiring diagram on Page 59  
and Optional Accessories Wiring (Page 61) for any accessories be-  
ing installed with the system.  
6. Using up/down arrows, select the test options individually (if so de-  
sired, you may choose to TEST ALL) and press the select button. (If  
selecting individual tests, repeat until you have selected all you intend  
to run.)  
4−conductor thermostat wire from the icomfortWi-Fithermostat  
to the gas furnace (R, i+, i−, C)  
4−conductor thermostat wire from the integrated furnace control  
(IFC) terminal strip to the icomfort−enabled AC unit (R, i+, i−, C)  
Wiring as required for accessories  
7. Press the start button. Confirm the AC unit is electrically energized and  
operational. Press done.  
8. Exit the installer setup mode by selecting the EXIT button.  
2. DO NOT cut any option link on air handler control.  
TIPS  
3. After the entire system is wired, power up the system; the icomfortWi-  
Fithermostat will check the system for installed communication de-  
vices.  
An outdoor temperature sensor is provided in an icomfort−enabled air  
conditioning unit. To display the outdoor temperature on the home  
screen of the thermostat, you must turn on (or off) the ꢁOutdoor Temp  
Display". From the Home screen, press press for more area and se-  
lect the HELP icon. Press the user preferences box and scroll down  
to ꢁOutdoor Temp Display". Press the modify button and use the up/  
down arrows to select On (or Off) and then press the save button.  
Press done to return to the Home screen.  
4. On the thermostat, go past the ꢁAdd or remove non−communicating de-  
vices" to the ꢁTo adjust a setting" screen.  
5. Use the arrows to select ꢁFurnace" from system devices list; press  
edit. From this Furnace screen you will have access to the various air-  
flow settings. Set the system air volumes according the needs of the  
home. When you change certain settings, the system will prompt you  
to ꢁplease view and save all red settings". Use the arrows to select the  
red settings and press edit. Either make changes or not, but press  
Turn the Indoor Humidity Display on and off in a similar manner as  
above.  
icomfort Wi-Fi7−Day Programmable Communicating Thermostat  
Page 65  
 
icomfort−enabled furnace & non−communicating air conditioner  
An icomfort−enabled gas furnace (G71MPP, EL296V, SLP98, SL280) with a  
conventional non−communicating air conditioner.  
7. Use the arrows to select ꢁFurnace" from system devices list; press  
edit. From this Furnace screen you will have access to the various air-  
flow settings. Set the system air volumes according the needs of the  
home. When you change certain settings, the system will prompt you  
to ꢁplease view and save all red settings". Use the arrows to select the  
red settings and press edit. Either make changes or not, but press  
save either way. The red settings will go away after pressing save.  
When all CFM settings are complete, press the back button. Press  
next step to advance to the tests button.  
1. WiringꢀSee Communicating Indoor/Non−Communicating Out-  
door System Wiring diagram on Page 59 and Optional Accessories  
Wiring (Page 61) for any accessories being installed with the system.  
4−conductor thermostat wire from the icomfortWi-Fithermostat  
to the gas furnace (R, i+, i−, C)  
Conventional thermostat wire with 2 to 4 conductors from the fur-  
nace terminal strip to the AC unit (Y1, C, & on some models, R &  
Y2)  
8. Using up/down arrows, select the test options individually (if so de-  
sired, you may choose to TEST ALL) and press the select button. (If  
selecting individual tests, repeat until you have selected all you intend  
to run.)  
Wiring as required for accessories  
2. Cut option link ꢁ2−stage compr" (Y1 to Y2, W915) on furnace control on  
two−stage AC units only.  
9. Press the start button. Confirm the AC unit is electrically energized and  
operational. Press done.  
3. After the entire system is wired, power up the system; the icomfortWi-  
Fithermostat will check the system for installed communication de-  
vices.  
10. Exit the installer setup mode by selecting the EXIT button.  
TIPS  
4. In the installer setup button, select ꢁAdd or Remove non−communicat-  
ing equipmentꢁ by using the yes button.  
If the thermostat ꢁSystem Setting" only shows ꢁheat onlyꢁ or ꢁoffꢁ  
choices and does not offer a choice for ꢁcooling" you must ꢁInstall" the  
non−communicating air conditioning unit. Select ꢁAdd or Remove non−  
communicating" under the setup button in the Installer Section. Select  
ꢁOutdoor Unit Type", press the edit button and then choose ꢁ1 Stage  
AC" or ꢁ2 Stage AC" and press the save button.  
5. Select the ꢁOutdoor Unit Type" from the device list using the up/down  
arrows and press the edit button. Then select the AC type (1−stage AC  
or 2−stage AC) and press the save button.  
6. Select the outdoor unit capacity and minimum outdoor unit capacity  
(2−stage only). Press save after editing each setting. Press back when  
finished to return to the adjust screen.  
On two−Stage Air Conditioners you must cut the ꢁW915 2 Stage  
Compr" link on the furnace control.  
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Setting up typical systemsꢁFURNACE & HEAT PUMP (DUAL FUEL)  
icomfort−enabled Furnace & icomfort−enabled HP unit (Dual fuel)  
Dual fuel system using an icomfort−enabled gas furnace (G71MPP, EL296V,  
SLP98, SL280) with an icomfort−enabled heat pump (XP17 or XP21 only).  
When all CFM settings are complete, press the back button. Press  
next step to advance to the tests button.  
8. Test the system operation and confirm the HP unit is electrically ener-  
gized and operational. Press done.  
1. Wiringꢀsee Communicating System Wiring diagram on Page 59  
and Optional Accessories Wiring (Page 61) for any accessories be-  
ing installed with the system.  
9. Exit the installer setup mode by selecting the EXIT button.  
4−conductor thermostat wire from the icomfortWi-Fithermostat  
to the gas furnace (R, i+, i−, C)  
4−conductor thermostat wire from the furnace terminal strip to the  
icomfort−enabled HP (R, i+, i−, C)  
Wiring as required for accessories  
TIPS  
High & Low Balance points are enabled and adjusted under the install-  
er section of the thermostat. In the equipment button select ꢁSystem"  
and press edit. Scroll down to ꢁBalance Point Control" and press edit  
and select Enabled and then save.  
2. DO NOT cut any option link on furnace control.  
An outdoor temperature sensor is provided in an icomfort−enabled heat  
pump unit. To display the outdoor temperature on the home screen of  
the thermostat, you must turn on (or off) the ꢁOutdoor Temp Display".  
From the Home screen, press press for more area and select the  
HELP icon. Press the user preferences box and scroll down to ꢁOut-  
door Temp Display". Press the modify button and use the up/down ar-  
rows to select On (or Off) and then press the save button. Press done  
to return to the Home screen.  
3. After the entire system is wired, power up the system; the icomfortWi-  
Fithermostat will check the system for installed communication de-  
vices.  
4. On the thermostat, go past the ꢁAdd or remove non−communicating de-  
vices" to the ꢁTo adjust a setting" screen. Select ꢁSystem" from the de-  
vice list using the up/down arrows and press the edit button  
5. Select Balance Point Control and press edit. Use the down arrow to  
select ꢁEnabled" and press save. High and Low Balance Points will ap-  
pear in red.