Lennox iComfort Wi-Fi Flex Installation instructions

CONTROLS
WI-FI THERMOSTAT
iComfort Wi-Fi®Flex Thermostat
Bulletin No. 210725
December 2015
The iComfort Wi-Fi®Flex Thermostat recognizes
and connects conventional heating/cooling
products to automatically congure and control
the system (based on user-specied settings)
for the highest level of comfort, performance and
efciency.
Additional indoor air quality comfort products
(PureAir™ Air Purication System, Healthy
Climate® Humidiers, Healthy Climate®Energy/
Heat Recovery Ventilators, Healthy Climate®
Germicidal Lights) can be added to the system for
a complete total-comfort system.
A simple easy-to-use touchscreen allows complete
system conguration. Scheduled maintenance
alerts, system warnings and troubleshooting are
also displayed on thermostat screen.
One-Touch Away Mode - A quick and easy way to
set the cooling and heating setpoints while away.
Weather-On-Demand - Live up-to-date weather
data and ve-day forecasts.
Easy to read 7 in. color screen (measured
diagonally).
Dimensions (H x W x D) - 5 x 7-1/2 x 1 in.
Installer setup screens allow quick and simple
system conguration without a manual.
Installer can also run tests on complete system or
individual components for easy maintenance and
troubleshooting.
Serial communications bus (RSBus), with less
wiring than a conventional heating/cooling system.
Uses 4-wire, 18-gauge standard thermostat wiring.
Subbase (with terminal strip) and all necessary
mounting hardware is furnished for easy
installation.
The Equipment Interface Module (EIM) allows
the iComfort Wi-Fi® Flex Thermostat to be used
with most conventional HVAC systems (with up to
3 stages heating and 2 stages cooling).
See page 2 for System Components.
See page 21 for available system congurations.
PRODUCT SPECIFICATIONS
Wi-Fi remote monitoring and
adjustment
through a home
wireless network
for desktop PCs,
laptops and apps
for smartphones
or tablets.
Service
alerts and
reminders
sent via text
message or e-mail.
Contents
Control Ordering Information . . . . . . . . . . . . . 20
EIM Connections . . . . . . . . . . . . . . . . . . . 21
Features - Equipment Interface Module (EIM) . . . . 20
Features - iComfort Wi-Fi® Flex Thermostat . . . . . 6
Homeowner Remote Access . . . . . . . . . . . . . 3
Installer Setup. . . . . . . . . . . . . . . . . . . . .12
System Components . . . . . . . . . . . . . . . . . 2
User Settings . . . . . . . . . . . . . . . . . . . . . 6
ICOMFORT®WI-FI FLEX THERMOSTAT

iComfort Wi-Fi®Flex Thermostat / Page 2
SYSTEM COMPONENTS
Conventional
Air Conditione
r
or
Heat Pump
Conventional
Furnace
Conventional
Wiring
Outdoor Air
Temperature Sensor
(Available as
an optional accessory
for conventional
outdoor units)
Optional
Discharge Air
Temperature Senso
r
Conventional
Air Handler
RSBus
iComfort Wi-Fi®
Flex Thermostat
Equipment
Interface
Module (EIM)
LEGEND
RSBus
Conventional Wiring
Di
Tem
p
iComfort Wi-Fi® Flex
Web and Mobile Apps
i
C
om
f
ort Wi-F
i
®
Fl
e
Web and Mobile Ap
ATTENTION - The Lennox iComfort Wi-Fi® Flex
Thermostat with Equipment Interface Module (EIM) will
work with most 24VAC furnaces, air conditioners, air
handlers and heat pumps (up to 3 stages of heat and 2
stages of cooling).

iComfort Wi-Fi®Flex Thermostat / Page 3
HOMEOWNER REMOTE ACCESS
HOMEOWNER LOGIN
The Login screen is accessible to the homeowner at:
www.myiComfort.com.
Thermostat must be registered before logging into the
Homeowner Remote Access Website (see page 10).
Wi-Fi remote temperature monitoring and adjustment through a home wireless
network via desktop PCs, laptops, and apps for smartphones or tablets.
After logging in and creating a prole (My Prole),
the homeowner can enter specic information for the
iComfort Wi-Fi® Thermostat (single or multiple systems),
set up multiple homes (My System).
The homeowner can control all iComfort Wi-Fi®
Thermostats on the network remotely through the
Website Dashboard.
Multiple iComfort Wi-Fi®Thermostat Control
• One home - one iComfort Wi-Fi®Thermostat
• Two or more homes - one iComfort Wi-Fi®Thermostat
each
• One home - multiple iComfort Wi-Fi®Thermostats
• Two or more homes - multiple iComfort Wi-Fi®
Thermostats

iComfort Wi-Fi®Flex Thermostat / Page 4
HOMEOWNER REMOTE ACCESS
WEBSITE DASHBOARD
Remotely control any iComfort Wi-Fi®Thermostat on a
home wireless network.
Accessible to the homeowner at:
www.myiComfort.com.
• Tabs at the top for different locations (Home 1, Home
2, etc.)
• Large display of current indoor temperature
• Current Indoor Relative Humidity
• Set Temperature
• Adjust Cool-To or Heat-To temperature setpoints
(Up/Down Arrow Buttons)
• Program ON Tab
• Program Setting
• Summer
• Winter
• Fall/Spring
• Save Energy
• Custom
Homeowner can select Programs pre-set on thermostat
but cannot remotely adjust individual settings within
Programs.
• Program OFF Tab (manual settings)
• Mode Settings
• Cool Only
• Heat Only
• Heat or Cool
• Off
• Emergency Heat (heat pump)
• Fan Settings
• Auto
• On
• Circulate
• Away Mode Button
• Alerts / Reminders Tab
• Current Alerts with Date and Time
• Service Information Tab
• Dealer Information
• Change Dealer Button
• System Tab
• System Name and information about HVAC
equipment
• ON/OFF
• Skins tab
• Upload Image
• Current Weather Conditions
• Local 5-Day Weather Forecast
• Show/Hide 5-Day Weather Forecast
MY ACCOUNT SCREEN
• My Prole
• Name
• Phone Number
• Mobile Phone Number
• Primary E-mail (change e-mail)
• Password (change password)
• My System
• Home Name (default home checkbox)
• Street Address, City, State, Zip/Postal Code
• Alerts and Reminder Preferences
• Home Details (show/hide)
• Building size, number of oors, number of
occupants, building style, number of bedrooms,
age of building, utility company
• My Dealer
• Change Dealer

iComfort Wi-Fi®Flex Thermostat / Page 5
HOMEOWNER REMOTE ACCESS
MOBILE APPS
The free iComfort®app is available for use
on iPhone®, iPad®, Android™ and Windows®
8 devices.
Control cooling/heating temperatures, fan
operation, set programs and set Away mode
for multiple locations.
Apple, the Apple logo, iPhone and iPad are trademarks of Apple
Inc. registered in the US and other countries.
Android is a trademark of Google Inc. Use of this trademark is
subject to Google permission.
Windows is a registered trademark of Microsoft Corporation in
the United States and other countries.
Available on the
Download from
Windows Store
Download from
Windows Store
CUSTOM SCREEN SAVER (SKINS)
Any high quality image (JPG format only, 800 x 480, 300 dpi for best resolution) can be uploaded to www.
myiComfort.com to change the appearance of the thermostat screen to match any color, pattern, design, or
décor.
Turn on Screen Saver on the iComfort Wi-Fi®Thermostat
On the thermostat, touch the Arrow Button on the home screen to access the Features Screen, touch the
Display Settings Button, touch the Screen Saver Button and select Skins. The image will appear after 30
seconds of inactivity. Touch the screen at any time to access the Home Screen controls.

iComfort Wi-Fi®Flex Thermostat / Page 6
HOME SCREEN (Thermostat ON)
Temperature Settings
• Large display of current indoor temperature (°F or °C)
In Celsius mode only the Home Screen displays Celsius.
All other thermostat settings displayed in Fahrenheit.
• Current cooling setpoint temperature Button (cool-to)
• Current heating setpoint temperature Button (heat-to)
• Raise / Lower temperature setting Arrows (up / down
arrows) to set cooling or heating setpoints indenitely
Touch either setpoint temperature button to display up /
down temperature adjustment arrows.
Touching either Temperature Setting Arrows (up / down
arrows) displays the Program Hold Screen. Preset 1,
2, 8, 24 hours or custom setting (date and time with
Keyboard Tool). Set and hold the temperature for a
preset or custom time period until the next time period
setting. Cancel Button on Home Screen cancels the
held setting.
Both setpoint temperatures are displayed if System is set
to Heat or Cool mode.
System Status Button
• Manual Settings
• Cool Only
• Heat Only
• Heat or Cool
• Off (system is OFF)
• Emergency Heat (if air handler or dual fuel system)
• Programs
• Select or edit a program (See page 9)
Touch to select system operating mode menu.
Humidity Display
• Displays current indoor relative humidity
FEATURES - ICOMFORT WI-FI® FLEX THERMOSTAT
USER SETTINGS System Status Display (animated)
• System is Heating
• System is Cooling
• System is Cooling and Dehumidifying
• System is Dehumidifying
• System is Waiting (time delay)
Fan Button (animated)
• On
• Auto
• Circulate
Current Outdoor Temperature
• Displays current outdoor temperature in °F or °C
The default outdoor temperature is supplied by the
Outdoor Air Temperature Sensor or the Wi-Fi data
connection (user selectable on the thermostat). The
outdoor sensor is furnished as standard with iComfort®-
enabled outdoor units, optional for conventional units.
Weather Forecast Display
• Displays current weather forecast
Touch to display 5-Day Forecast screen.
Arrow Button
Touch to display Features screen (See page 7).
Enter Away Mode Button
Touch to display Away Mode screen (See page 12).
Wi-Fi Indicator
• Displays if Wi-Fi is enabled
Touch to display Wi-Fi-Settings Screen (See page 10).
Time and Date Display
• Displays current date and time
Touch to display Clock Settings screen (See page 8).
Service Alerts
• A red Alert indicates that service is required for a
major system component as soon as possible
• A yellow Alert indicates required maintenance (lter
replacement, humidier pad replacement, UV light
replacement, PureAir™ Air Purication System
servicing and Maintenance)
Touch to display Alerts Screen (See page 9).

iComfort Wi-Fi®Flex Thermostat / Page 7
FEATURES - ICOMFORT WI-FI® FLEX THERMOSTAT
USER SETTINGS
HOME SCREEN (Thermostat ON) (Continued)
Help Button
• Displays help information
Touch to display Help information. Touch the question
mark over each feature for additional information.
Logo Button
• Switches to Installer Mode (See page 18)
Touch and hold for 3 seconds to display Installer Setup
screen (See page 18).
Lock Icon
• Indicates partially locked (allows temperature
adjustment up or down for a selectable time) or fully
locked (no adjustment)
To unlock, touch and hold the lock icon for 5-6 seconds.
FEATURES SCREEN
Touch any Button to display desired screen.
• Edit Program Button (see page 9)
• System Settings Button (see page 7)
• Display Settings Button (see page 8)
• Alerts Button (see page 9)
• Reminders Button (see page 9)
• Service Button (see page 12)
• Home Icon (lower-right, returns to Home Screen)
SYSTEM SETTINGS SCREEN
Humidier Settings Buttons
• Humidier is OFF
• Humidier is ON (15 to 45% RH - default is 40%)
De-Humidier Settings Buttons
• Dehumidify
• OFF (settings not shown)
• MEDIUM
• HIGH
• ON setting (40 to 85% RH - default is 50%)
Select the humidity level you want inside the home.
• Humidity Display is OFF/ON (on Home Screen)

iComfort Wi-Fi®Flex Thermostat / Page 8
FEATURES - ICOMFORT WI-FI® FLEX THERMOSTAT
USER SETTINGS
CLOCK SETTINGS SCREEN
• Set current Time and Date
• Time Format (12 or 24 Hour)
• Daylight Savings Time (enabled/disabled)
DISPLAY SETTINGS SCREEN
Background Theme Button
• Cobalt
• Cotton
• Carbon
Temperature Scale Button
• Fahrenheit or Celsius
Screen Saver Button
• ON/OFF
• Skins
Screen Lockout Button
• Unlocked
• Partially
• Locked
Language Button
• English
• Français
• Español
Outdoor Temperature Display Button
• Off
• Internet
• Sensor
Optional Outdoor Air Temperature Sensor is required and
must be ordered extra for “Sensor” Display setting.
Backlight Intensity Button
• Adjustable 20, 40, 60, 80, 100% (default 80%)
Clean Screen Button
• 30 Second Countdown timer without affecting settings

iComfort Wi-Fi®Flex Thermostat / Page 9
FEATURES - ICOMFORT WI-FI® FLEX THERMOSTAT
USER SETTINGS
WEATHER SCREEN
Displays local 5-Day Weather Forecast
Wi-Fi must be enabled to access weather forecast
screen.
EDIT PROGRAMS SCREEN
Select Programs Button
• Summer
• Winter
• Spring/Fall
• Save Energy
• Custom
• Program will follow these settings for days selected
Touch and hold button to change Program name.
Select Days Button
• All 7 Days
• Week/Weekend (Mon-Fri. and Sat-Sun.)
• Individual Days (Monday, Tuesday, etc.)
Program Setting Buttons
• Time (Adjustable in 15 minute increments)
• Cool-To (Adjustable in 1° increments)
• Heat-To (Adjustable in 1° increments)
• Fan Mode (On, Auto, Circulate)
Touch and hold any time button to disable that period.
ALERTS SCREEN
Displays Alert History
• Alert Code
• Date and Time Alert occurred
• System Reports
Set Alert Button
• Last 24 Hours
• Last 30 Days
• Last 12 Months
REMINDERS SCREEN
Reminder Buttons
• Replace Filter 1
• Replace Filter 2
• Replace Humidier Pad
• Replace UV Bulb
• Maintenance Reminder Required
• PureAir™ Maintenance Reminder Required
• Settings
• Disabled
• 3, 6, 12, 24 Months or Custom
Custom Button accesses Clock Settings Screen to input
custom date and time settings.

iComfort Wi-Fi®Flex Thermostat / Page 10
FEATURES - ICOMFORT WI-FI® FLEX THERMOSTAT
USER SETTINGS
WI-FI SETTINGS SCREEN
• Connection Status Button
• Wi-Fi Enabled Button (enabled/disabled)
• Network Settings Button (showing current network
connection)
• Thermostat Registration Button (E-Mail)
• Firmware Update Button (auto/off)
Touch Network Settings Button to access Network
Setting Screen.
Wi-Fi must be enabled for Registration and Firmware
Updates.
CONNECTION STATUS SCREEN
A graphical representation of the home network showing
the connection status from the thermostat to the Internet
to the Lennox server.
• Router Button
• Internet Status Indicator
• Server Button
iComfort Wi-Fi Flex Thermostat supports wireless bands
802.11b, 802.11c and 802.11n
Touch Router Button to access Network Setting Screen
if not connected.
Touch Server Button to access Thermostat
Registration if not registered.
NOTE - A red “X” means that there is an issue with a
connection point that must be resolved.
THERMOSTAT REGISTRATION
Registration is completed on the thermostat after
establishing a wireless connection.
• Enter homeowner’s e-mail address
• Enter the system description
• Touch Register Button
• A Registration e-mail is sent to the homeowner to
access the Homeowner Remote Access website and
setup the homeowner’s account (see page 3)

iComfort Wi-Fi®Flex Thermostat / Page 11
NETWORK SETTINGS SCREEN
Displays available Wi-Fi Network Access Points
• Available Network Buttons
• Scan for Networks Button
• Add New Network Button
Touch desired Network Button to connect to network,
opens keyboard tool to input security key or passphrase.
FEATURES - ICOMFORT WI-FI® FLEX THERMOSTAT
USER SETTINGS
NETWORK SETUP SCREEN
Touch the Add New Network Button to open the network
setup screen.
• Enter Network Name (SSID)
• Select security type (None, WEP, WPA, WPA2)
• Enter Password
• Touch Connect

iComfort Wi-Fi®Flex Thermostat / Page 12
FEATURES - ICOMFORT WI-FI® FLEX THERMOSTAT
INSTALLER SETUP
SERVICE SCREEN
Displays Dealer Service Information
• Dealer Name
• Dealer Address
• Dealer Phone
• Dealer E-mail
• Dealer Website
• Dealer Number
Touch any line to edit Dealer Information with keyboard
tool.
Thermostat Info Button
• Model Number
• Serial Number
• Hardware Revision
• Software Revision
AWAY MODE SCREEN
Set Away Temperature Setpoints
Sets the thermostat for energy saving mode while away
for an extended period of time.
System will only operate if indoor temperature falls
below 62°F (for heating) or rises above 85°F (for
cooling). Adjustable.
• Set cooling setpoint temperature Button (cool-to)
• Set heating setpoint temperature Button (heat-to)
• Cancel Away Mode Button

iComfort Wi-Fi®Flex Thermostat / Page 13
FEATURES - ICOMFORT WI-FI® FLEX THERMOSTAT
INSTALLER SETTINGS
SYSTEM DISCOVERY
After power is applied to the thermostat for the rst time,
it displays the iComfort® “splash screen”, checks the
system for installed devices, and displays the “Use this
thermostat?” screen.
During the setup process, alerts may be displayed to
inform the installer of any information that affects the
setup process.
SYSTEM SETTINGS SCREEN
Use the up / down arrows to scroll through available
settings. Right side of screen displays the current value
of each setting.
Touch any line and touch Edit to change System
Settings.
Installer System Settings and Default Setting
System
Setting
Range /
Condition
Default
Setting
Modify
with
Time and Date - - - - - - Clock
Setting
Screen
Daylight Saving
Time
Enabled/
Disabled
Enabled Radio
Buttons
Circulate Fan ON
Time
15 to 45% 35% Up/Down
Arrows
Temperature Unit Fahrenheit/
Celsius
Fahrenheit Radio
Buttons
System Name alpha-
numeric
characters
my iComfort
system
Keyboard
tool
Dealer Number - - -
Dealer Name Lennox
Dealer Address - - -
Dealer Phone 1-800-9-LENNOX
Dealer Email - - -
Dealer Website www.lennox.com
DEALER NUMBER WARNING SCREEN
NOTE - Dealer must enter a valid Dealer Number to
be able to remotely monitor the homeowner’s
system status and receive e-mail alerts.

iComfort Wi-Fi®Flex Thermostat / Page 14
FEATURES - ICOMFORT WI-FI® FLEX THERMOSTAT
ABOUT SYSTEM DEVICES SCREEN
Use the up / down arrows to scroll through available
system devices. Right side of screen displays the
device description.
Touch any line and touch About to view device
information. Displays equipment information depending
on type (name, model, serial number, number of stages,
cooling btuh, indoor blower cfm range, software version,
outdoor air temp sensor installed, etc.).
System
• Language Support
• Equipment Type name
• Control Software Revision
• Control Model Number
• Control Serial Number
• Control Hardware Revision
• Protocol Revision Number
• Device Product Level
• 24VAC Average Power Consumption
• 24VAC Peak Power Consumption
Air Conditioner
• Language Support
• Equipment Type name
• Unit Model Number
• Unit Serial Number
• Unit Nominal Capacity
• Number of Cooling Stages
• Cooling Capacity by Stage
• Control Software Revision
• Control Model Number
• Control Serial Number
• Control Hardware Revision
• Outdoor Air Temp Sensor
• Protocol Revision Number
• Device Product Level
• 24VAC Average Power Consumption
• 24VAC Peak Power Consumption
INSTALLER SETTINGS
• Line Voltage Average Power Consumption
• Line Voltage Peak Power Consumption
• Outdoor Fan RPM Prole
Heat Pump
• Language Support
• Equipment Type name
• Unit Model Number
• Unit Serial Number
• Unit Nominal Capacity
• Number of Heating Stages
• Number of Cooling Stages
• Heating Capacity by Stage
• Cooling Capacity by Stage
• Control Software Revision
• Control Model Number
• Control Serial Number
• Control Hardware Revision
• Outdoor Air Temp Sensor
• Protocol Revision Number
• Device Product Level
• 24VAC Average Power Consumption
• 24VAC Peak Power Consumption
• Line Voltage Average Power Consumption
• Line Voltage Peak Power Consumption
• Outdoor Fan RPM Prole
Furnace or Air Handler
• Language Support
• Equipment Type name
• Unit Model Number
• Unit Serial Number
• Unit Nominal Capacity
• Number of Heating Stages
• Heating Capacity by Stage
• Indoor Blower CFM Range
• Control Software Revision
• Control Model Number
• Control Serial Number
• Control Hardware Revision
• Discharge Air Temp Sensor
• Outdoor Air Temp Sensor
• Protocol Revision Number
• Device Product Level
• Factory Installed Transformer
• 24VAC Average Power Consumption
• 24VAC Peak Power Consumption

iComfort Wi-Fi®Flex Thermostat / Page 15
ABOUT SYSTEM DEVICES SCREEN (Continued)
Furnace or Air Handler (Continued)
• Line Voltage Average Power Consumption
• Line Voltage Peak Power Consumption
Thermostat
• Language Support
• Equipment Type name
• Control Software Revision
• Control Model Number
• Control Serial Number
• Control Hardware Revision
• Protocol Revision Number
• Device Product Level
• 24VAC Average Power Consumption
• 24VAC Peak Power Consumption
ADD OR REMOVE NON-COMMUNICATING DEVICES
SCREEN
Use the up / down arrows to scroll through available
system devices.
Touch any line and touch Yes to add or remove non-
communicating equipment.
Bold indicates default setting.
• Outdoor Unit Type
(Not Installed, 2 Stage AC Unit, 2 Stage HP Unit, 1
Stage AC Unit, 1 Stage HP Unit)
• Outdoor Unit Capacity
(18 to 60 kBtuh, default is 60 kBtuh)
• Outdoor Unit 1st Stage Capacity
(30 to 100 % (default is 70 %)
• Humidier
(Not Installed, Power (120VAC) Humidier, Bypass
(24VAC) Humidier, Bypass and Power Humidier)
NOTE - if Air Handler is used, Bypass is the only
Humidier option.
• Dehumidier
(Not Installed, Auxiliary Dehumidier)
FEATURES - ICOMFORT WI-FI® FLEX THERMOSTAT
INSTALLER SETTINGS

iComfort Wi-Fi®Flex Thermostat / Page 16
FEATURES - ICOMFORT WI-FI® FLEX THERMOSTAT
INSTALLER SETTINGS
ADJUST SYSTEM DEVICES SCREEN
Use the up / down arrows to scroll through available
system devices.
Touch any line and touch Edit to adjust a device’s
setting. Touch resetAll to reset all system devices.
Bold indicates default setting.
NOTE - “Reset ALL” resets all devices back to original
factory default settings. Each individual device can be
also reset to factory settings on the selected equipment
screen.
Equipment Name - Press “edit” button to change
equipment name, use keyboard tool to change.
System
• Equipment Name (Keyboard tool)
• Filter 1 Timer Selection (Calendar or Run Time)
• Filter 2 Timer Selection (Calendar or Run Time)
• UV Bulb Timer Selection (Calendar or Run Time)
• Humidier Pad Timer Selection (Calendar or Run Time)
• PureAir Timer Selection (Calendar or Run Time)
• Smooth Setback Recovery (Enabled/Disabled)
• Gas Heat Control Mode (Staged)
• Number of Gas Heating Stages (1, 2, 3, or 4,
default is 4)
Staged
• Auto Changeover – Temp Deadband (3 to 9°F,
default is 3°F)
• Max. Heat Setpoint (40 to 90°F, default is 90°F)
• Min. Cool Setpoint (60 to 99°F, default is 60°F)
• Heat Cool Stages Locked In (Enabled/Disabled)
• 1st Stage Differential (0.5 to 3.0°F, default is 1.0°F)
• 2nd and 3rd Stage Differential (0.5 to 8.0°F, default
is 0.5°F)
• Staged Delay Timers (Enabled/Disabled)
• 2nd and 3rd Stage Delay (5 to 120 min. in 5 min.
increments, default is 20 min.)
Number of heating stages shown depends on equipment
installed. Electric heat is staged at every 2 elements.
• Balance Point Control (Enabled/Disabled)
• High Balance Point (–17 to 75°F, default is 50°F)
• Low Balance Point (–20 to 72°F, default is 25°F)
Heat Pump
• Min Dehumidication Setpoint (40 to 60°F, default is 40°F)
• Humidication Control Mode (Display Only,
Precision, Precision Dew Point Control, Basic, Basic
Dew Point Control)
• Dew Point Adjustment (–15 to 15°F, default is 0)
• Max. Humidication Setpoint (15 to 45% RH, default
is 45%)
• Auto Changeover Humidication Deadband (5 to 10%
RH, default is 5%)
Humidier
• Outdoor Temperature Reading Calibration (–10 to
10°F, default is 0)
• HP Heating Lockout Time (60 to 240 min., default is
120 min.)
D. Fuel
• Reset Button (resets system back to factory default
settings)
NOTE - Depending on type of system (conventional
heating/cooling or heat pump system) and optional
equipment not all system settings will be displayed.
Air Conditioner or Heat Pump
• Equipment Name (Keyboard tool)
• Compressor Short Cycle Delay (60 to 300 sec.,
default is 300 sec.)
• Defrost Termination Temp (Heat Pump only) (50 to
100°F, default is 50°F)
• Compressor Shift Delay (Heat Pump only) (On/Off,
default is On)

iComfort Wi-Fi®Flex Thermostat / Page 17
FEATURES - ICOMFORT WI-FI® FLEX THERMOSTAT
INSTALLER SETTINGS
Air Handler
• Equipment Name (Keyboard tool)
• Electric Heating Airow
• High Cooling Airow
• High HP Airow
• Continuous Indoor Blower Airow (450 to 1150 cfm,
default is 600 cfm)
• Humidication Airow (Humidier)
• Dehumidication Airow (Dehumidier)
(60 to 80%, default is 70%)
Dehumidication Airow is 60 to 80% reduction of the
High Cooling Airow parameter.
• Delay Settings
• Heating Indoor Blower OFF
(0 to 10 sec., default is 10 sec.)
• Heating Indoor Blower ON
(0 to 5 sec., default is 0 sec.)
• Cooling Indoor Blower OFF
(0 to 30 sec., default is 0 sec.)
• Cooling Indoor Blower ON
(0 to 10 sec., default is 2 sec.)
• HP Indoor Blower OFF
(0 to 60 sec., default is 45 sec.)
• HP Indoor Blower ON
(0 to 30 sec., default is 0 sec.)
Thermostat
• Equipment Name
• Temp. Reading Calibration (-5 to 5°F, default is 0°F)
• Humidity Reading Calibration (-10 to 10°F, default is 0°F)
ADJUST SYSTEM DEVICES SCREEN (Continued)
Furnace
• Equipment Name (Keyboard tool)
• Continuous Indoor Blower Airow (250 to 1150 cfm,
default is 315 cfm)
• Dehumidication Airow % (60 to 80%, default is 70%)
• Delay Settings
• Heating Indoor Blower OFF
(60 to 180 sec., default is dependent on DIP switch
setting in furnace)
• Heating Indoor Blower ON
(15 to 45 sec., default is 30 sec.)
• Cooling Indoor Blower OFF
(0 to 30 sec., default is 0 sec.)
• Cooling Indoor Blower ON
(0 to 10 sec., default is 2 sec.)
• HP Indoor Blower OFF
(0 to 60 sec., default is 45 sec.)
• HP Indoor Blower ON
(0 to 30 sec., default is 0 sec.)
HP Dual Fuel
• Heating Airow Control Type - Selections available if
Discharge Air Temperature Sensor is installed (Fixed
cfm, xed Discharge Air Temperature)
With Discharge Air Temperature:
• Low Heating Discharge Air Temperature - Available
if Discharge Air Temperature Sensor is installed
(110 to 140°F, default is 125°F)
• High Heating Discharge Air Temperature - Available
if Discharge Air Temperature Sensor is installed
(120 to 150°F, default is 135°F)
With Fixed cfm:
• Low Heating Airow
(325 to 475 cfm, default is 475 cfm)
• High Heating Airow
(800 to 1100 cfm, default is 975 cfm)
• High Cooling Airow
(270 to 1150 cfm, default is 825 cfm)
• High HP Airow (300 to 1400 cfm, default is 800 cfm)
All furnace default airow settings are dependent on
furnace capacity.
NOTE - Humidication and Dehumidication Airow
settings are only viewable if those products are added
during setup.

iComfort Wi-Fi®Flex Thermostat / Page 18
FEATURES - ICOMFORT WI-FI® FLEX THERMOSTAT
INSTALLER SETTINGS
INSTALLER SETUP SCREEN
When the Home Screen is displayed touch and hold the
Logo Button for 5-6 seconds to switch to the
Installer Mode Screen.
Touch each checkbox to select the equipment you want
to setup or use the Select All Button. Use the Deselect
All Button to uncheck all boxes.
Setup Button
• Allows installer to setup a new system or re-setup an
existing system (see page 13)
Tests Button
• Run system tests (see page 18)
Equipment Button
• Allows installer to edit system devices (see page
19)
Alerts Button
• View system alerts (see page 9)
Diagnostics Button
• Run system diagnostics (See page 18)
View Active Button
• View any active alerts
View Cleared
• View any previously cleared alerts
TESTS SCREEN
A variety of system tests can be performed by the
installer. Select the tests to be performed individually by
touching the checkboxes or use the Select All Button
to run all available tests. Use the Deselect All Button to
uncheck all boxes.
The Skip Tests Button allows bypassing all system
tests.
When a test is running, a status screen will show which
test is being run and the results. Use the up / down
arrows to scroll through the results.
Touching the Next Button advances to the next test.
A Testing Process is Finished conrmation screen will
appear when testing is complete.
NOTE - The tests feature is not available until after setup
has been completed at least once.

iComfort Wi-Fi®Flex Thermostat / Page 19
FEATURES - ICOMFORT WI-FI® FLEX THERMOSTAT
INSTALLER SETTINGS
DIAGNOSTICS SCREEN
Allows installer to run diagnostic tests on any iComfort®-
enabled product.
EQUIPMENT SCREEN
The Equipment Button allows the same equipment
setting adjustments as in setup, see Adjust System
Devices, page 16.

iComfort Wi-Fi®Flex Thermostat / Page 20
EIM MODULE
Contains all necessary relays and controls to emulate
an iComfort®-enabled indoor unit.
Module has two green LEDs. One indicates status and
aids in troubleshooting, a second LED indicates RSBus
communication.
Any system alerts/warnings are transmitted to the
iComfort Wi-Fi®Flex Thermostat.
Conventional thermostat wiring connects the EIM to
the conventional indoor/outdoor unit equipment. See
System Components on page 2 for additional
details.
Jumpers are furnished for the following settings:
• Unit Type: IFC (furnace) or AHC (air handler). Default
setting is furnace.
• Number of Heat Stages (0, 1, 2, 3). Default setting is
1 stage.
• Heat Pump Capacity (Tons) (1.5, 2.0, 2.5, 3.0, 3.5,
4.0, 5.0). Default setting is 3.0.
Terminal Connections
Communicating RSBus - To iComfort®thermostat:
• R, I+, I–, C
Non-Communicating - To conventional indoor/outdoor unit:
• W1, W2, W3, G, Y2, Y1, C, DS, R, H, O, B
Dual-Fuel - To heat pump:
• DFTS, w1-DEF, O, B
Connections are also furnished for an Outdoor Air
Temperature Sensor and Discharge Air Sensor. Sensors
must be ordered separately.
Blade-type 3 amp fuse protects module.
FEATURES - EQUIPMENT INTERFACE MODULE (EIM)
EIM CASE
Constructed of high impact ABS plastic.
Hinged cover with latching tabs prevents tampering.
Can be mounted on the side of the indoor unit or a
nearby stud or wall.
Dimensions (H x W x D): 6-1/8 x 7-1/2 x 1-3/8 in. (156 x
191 x 35 mm)
Weight: 1 lb.
EQUIPMENT WARRANTY
Five years in residential installations and one year in
non-residential installations.
Refer to Lennox Equipment Limited Warranty certicate
included with unit for specic details.
CONTROL ORDERING INFORMATION
Description Catalog No.
iComfort Wi-Fi® Flex Thermostat and Equipment Interface Module (EIM) 11U61
1 Optional Outdoor Air Temperature Sensor X2658
2 Discharge Air Temperature Sensor 88K38
1 The Optional Outdoor Air Temperature Sensor may be ordered for use with a conventional outdoor unit. Allows the thermostat to display outdoor temperature.
Required for dual-duel applications with a heat pump outdoor unit.
2Optional for service diagnostics.