Lennox 11U61 Operating and safety instructions

201Lennox Industries Inc.
Dallas, Texas, USA
THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER
FOR FUTURE REFERENCE
NOTICE
Read this manual before programming this thermostat.
Use this thermostat only as described in this manual.
WARNING
Improper installation, adjustment, alteration, service or maintenance
can cause property damage, personal injury or loss of life.
Installation and service must be performed by a licensed professional
HVAC installer (or equivalent) or service agency.
INSTALLER'S SYSTEM SETUP
GUIDE
iComfort Wi-Fi®Flex
Touchscreen Programmable Thermostat (11U61)
CONTROLS
Shipping and Packing List
Thermostat container includes:
1 - Thermostat
4 - Wall anchors
1 - Homeowner's manual
4 - Mounting screws
Equipment Interface container includes:
1 - Equipment Interface Module
1 - Equipment Interface Module Installation Instruction
1 - Warranty card

507428-01 2
TABLE OF CONTENTS
Overview - Technical Description and Features 2................
Installation and set up 3.....................................
Adjusting System Settings 4..................................
Connecting to Home Wi-Fi Router 6...........................
Troubleshooting Wi-Fi Connection 9...........................
Account Registration 14......................................
Firmware Update 15.........................................
Adding Conventional Outdoor Unit and Accessories 15............
Outdoor Unit (Air Conditioner or Heat Pump) 15...................
Bypass (24VAC) Humidifier 15..................................
Auxiliary Dehumidifier 16......................................
Adjusting Humidification and Dehumidification Settings with
Conventional Outdoor Units 17................................
Using the Tests / Diagnostics Features 20.......................
Using the Secure Web Portal 22...............................
Skins 22...................................................
Screen-Saver 22............................................
Accessing Installer Screens and Changing
Equipment Parameters 24....................................
Wiring Diagrams 26..........................................
Overview - Technical Description and Features
The iComfort Wi‐Fi®Flex Thermostat is a 24VAC, color
display touchscreen and 7-day programmable
thermostat. It stores system parameters and settings in
non-volatile memory (i.e., it retains data when electrical
power fails or is turned off).
The iComfort Wi‐Fi®Flex thermostat can connect to
online services via the Internet through the homeowner's
Wi-Fi access point. After online registration is
completed, the system may then be accessed by the
homeowner from anywhere using a remote Internet
connection via computer, smartphone or other personal
Internet-connected devices.
WARNING
This is a 24VAC Class 2 thermostat. Do not install on voltages higher
than 30VAC.
Do not switch system to cool if the outdoor temperature is below 45°F
(7°C). This can damage the cooling system.
WARNING
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7-Day Programmable iComfort Wi‐Fi®Flex Thermostat
3
This thermostat supports:
 Wireless bands 802.11b, 802.11g and 802.11n
 Three languages (English, French, Spanish)
 Air conditioning or heat pump units with up to four
stages of heat / two stages of compressor operation
(2 stages of heat pump heating, 2 stages of auxiliary
back-up heating and 2 stages of emergency heating)
 Variable-capacity / multiple-stage heat / cool and
universal compatibility (gas/electric/heat pump/air
conditioner).
 Dual-fuel capable with two balance points.
 Indoor air quality with time‐based notification of
consumables including media filters, UVC bulbs,
humidifier pads and PureAir system catalyst
service / replacement,
 Humidification measurement and control.
 Dew point adjustment control
 Equipment maintenance reminders
 Autochangeover mode -- Permits control of heating,
cooling, humidification, and dehumidification without
user involvement
Installation and Setup
During initial thermostat start-up the following screen will
appear (see figure 1). This indicates that the thermostat
is active and booting up.
...
Figure 1. Boot-Up Screen
COMMUNICATION ERROR SCREEN
During initial thermostat start-up if the following screen
appears (see figure 2), this will indicate that the
thermostat has been incorrectly wired or has shorted

507428-01 4
wires. Turn power off to the system and verify that all
wiring is correct.
Figure 2. Communication Error Screen
Adjusting System Setting
SET TIME AND DATE
Use the arrows to select Time and Date; touch edit to
proceed to the “Set current time and date” screen.
When “Time and Date” screen appears, enter the correct
date as follows:
 Use the left and right arrows to change the month
and year.
 Touch a day of the month to select it.
 Touch on the hour or minute; up down arrows appear
to allow change.
 Touch the am/pm field to toggle it between am and
pm.
 When the correct date and time is set, touch save to
save settings and return to previous settings screen.
Touch next to continue to next screen.
CIRCULATE FAN ON TIME SETTING
“Circulate” is enabled on the user's home screen or
system settings page. It keeps air circulating from 15%
to 50% percent of time. The following settings
approximate how long the fan will run at these typical
settings:
15% (9 minutes fan run time per hour)
25% (15 minutes fan run time per hour)
35% (21 minutes fan run time per hour)
45% (27 minutes fan run time per hour).
NOTE - If the circulate fan mode is on, a timer is set to
measure all the time that the fan is blowing, regardless if
it is running to deliver heating or cooling or just for air
circulation.
DEALER NUMBER
Either the dealer number or phone number is required.
Once either number is entered, all other fields will
automatically be populated once the thermostat has
been registered during the Wi-FI set up procedure later
on in this instruction (if the dealer has an account with
Lennox already).

7-Day Programmable iComfort Wi‐Fi®Flex Thermostat
5
NOTE - Dealer number is the dealer's Lennox account
number. Dealer phone number is the dealer's main office
phone number.
1. Use the arrows to scroll down to the Dealer Number
or Dealer Phone setting. Press the edit button.
2. Enter the Dealer Number or Dealer Phone
Number using the on-screen keyboard. Press save
to continue.
NOTE: If a Dealer Number or Dealer Phone Number is
not entered and the next button is selected, a pop-up
warning screen will appear.
3. Press yes to continue to the System Devices
screen. Press no to return to the system settings
screen.
WARNING
Are you sure you want to proceed?
Please enter your DEALER PHONE NUMBER or DEALER NUMBER
If you do not enter either, the thermostat will not show up on
DaveNet and you will not be able to remotely monitor the system
status or receive email alerts when there is a problem.
no
yes
WARNING
The dealer number is your Lennox account number) i.e
A12345). Your dealer phone number should be the main office
phone number associated with your dealership. If you have any
questions, please contact your Lennox representative.
Are you sure you want to proceed?
Figure 3. Dealer Number Warning
The following table lists all of the installer configurable
system level parameters available from the installer set
up screens. After adjusting system settings, select next
to continue.
Table 1. System Settings
Parameter
Name Default Parameter Value Setting Increment
Time and
Date —(Time/date elements screen) —
Daylight
Saving Time Enabled Enabled, Disabled —
Circulate Fan
ON Time 35% Range 15 to 45% 1%
Temperature
Unit Fahrenheit Fahrenheit or Celsius —
System Name —(keyboard input
screen) —
Dealer
Number ****
(keyboard input
screen)
Note: When adding
the dealer number,
all other dealer
fields will auto pop
ulate once thermo
stat registration is
completed.
—
Dealer Name Lennox —
Dealer
Address — —
Dealer Phone 1-800-9-LEN
NOX —
Dealer Email — —
Dealer
Website
www.lennox.
com —

507428-01 6
Connecting to a Home Wi-Fi Router
Check the router utility program or contact service
provider for help. When determining the location for the
Wi-Fi thermostat, be sure it is in an area near enough to
the home Wi-Fi router to ensure good communications
signal strength between the thermostat and the Wi-Fi
router. (Hint: Use a smart phone with Wi-Fi and Wi-Fi
finder application to locate and determine optimal
location based on router Wi-Fi signal strength.)
NOTE - Thermostat will not be able to reliably connect to
a router if the received signal strength indicator (RSSI) is
-70 or greater.
NOTE - Correct the cause of any alerts prior to
continuing set up. Secure Connection Recommended!
Verify the home Wi-Fi router supports at least one of the
supports wireless bands (802.11b, g or n). Check router
utility program or contact service provider for assistance.
ENABLING WI-FI
To enable the Wi-Fi feature to communicate with a
wireless router
1. Press and release Wi-Fi in the lower left corner of
the HOME screen
indoor temperature
indoor humidity is 41%
fan is
OFF
9:39 am Aug 15, 2012
fan is
AUTO
cool-to
set temp
75
Heat-to
72
heat
or
cool
fan is
AUTO
enter
away
outdoor
temperature
80
system is cooling
Wi-Fi ?
1
Wi-Fi
Figure 4. Press Wi-FI
2. Press the Wi-Fi disable button to enable Wi-Fi.
WI-FIL SETTINGS
Press to enable /
disable Wi-FI
disabled
Thermostat is not connected to the Wi-FI network
WI-FI
X
Figure 5. Enable Wi-FI

7-Day Programmable iComfort Wi‐Fi®Flex Thermostat
7
3. The User Agreement screens will appear next.
Press next as many times as necessary; then press
accept after reading the User Agreement.
ESTABLISHING A WI-FI CONNECTION
There are two methods to set up your Wi-Fi connection.
Select either NETWORK SETTINGS or connection
status.
Method 1 — Network Settings Method
1. Press NETWORK SETTINGS; this screen shows a
graphical view of buttons representing OPEN and
SECURE Wi-Fi networks and a button for adding a
network.
WI-FI SETTINGS
press to enable /
disable Wi-FI
enabled
Thermostat is not connected to the Wi-FI network
WI-FI
X
NETWORK
SETTINGS
press to change
network settings
Must setup a network connection before registering thermostat
connection
status
Press to see
connection status
Figure 6. Enable Wi-FI
Open connection which which requires no
password.
Secure connection which requires Wi-Fi
password (security key).
Add a network is required when Wi-Fi
identification (SSID) is being hidden (not
broadcasting). You will need to know the Wi-Fi
network name (SSID), security encryption type
(if enabled), and security password (if security
encryption is enabled).
2. When selecting a:
unsecured connection a screen will appear with
two options, connect and router info. Press
connect to continue.
secured connection a screen will appear
requesting the Wi-Fi network password
(security key). There are two options to select
from which are connect and router info. Using
the on-screen keyboard, enter the password
(security key) and then press connect to
continue.
HOME
DS9A
Open connection (no password required)
Secure connection (password required)
(lock icon is present)
Figure 7. Typical Connection Type and Signal
Strength

507428-01 8
NOTE - The router info button provides information
concerning the home Wi-fi connection (i.e, RSSI, IP
address, MAC address and wait state) all of which may
be helpful in troubleshooting network connection
issues).
3. If connection is successful the screen will return to
the available networks screens. Press AP3 as
exampled in figure 8 to return to the previous screen.
If the connection was successful it will be listed
connected as exampled below.
WI-FI SETTINGS
press to enable //
disable Wi-FI
9:39 am Aug 15, 2012
enabled
WI-FI
?
X
AP3
connected
press to change
wireless network
Must setup a network connection before registering thermostat
Wi-Fi
connection
status
Press to see
connection status
thermostat
not
registered
press to change
thermostat
registration
Figure 8. Network Connected
ESTABLISHING A WI-FI CONNECTION TO A
HIDDEN NETWORK
1. When connecting to a hidden network, press the
add new network icon to continue. Enter the
network name (SSID). If security encryption is
enabled, then press the security is none icon.
Select either WEP, WPA or WPA2.
2. Using the on-screen keyboard, enter the password
(security key). If the network name or security key
combination is incorrect or incorrectly type, and
access to the specified network failed, a message
will alert you to retry.
3. If connection is successful the screen will return to
the available networks screens. The network
successfully connected will be listed and shown as
connected as exampled in figure 8.
Method 2 — Connection Status Method
1. Press connection status; this screen shows a
graphical view of the current connection status.
2. Select the router icon to choose the desire W-Fi
network. When selecting a:
unsecured connection a screen will appear with
two options, connect and Router Info. Press
connect to continue.
secured connection a screen will appear
requesting the Wi-Fi network password
(security key). There are two options to select
from which are connect and router info. Using
the on-screen keyboard, enter the password

7-Day Programmable iComfort Wi‐Fi®Flex Thermostat
9
(security key) and then press connect to
continue.
3. If connection is successful the screen will return to
the available networks screens. Press Xto return to
the previous screen. If the connection was
successful it will be listed connected as exampled
below.
WI-FI SETTINGS
press to enable //
disable Wi-FI
9:39 am Aug 15, 2012
enabled
WI-FI
?
X
xxxx
connected
press to change
wireless network
Must setup a network connection before registering thermostat
Wi-Fi
connection
status
Press to see
connection status
thermostat
not
registered
press to change
thermostat
registration
Figure 9. Network Connected
4. Select Xto return to the WI-FI SETTINGS screen.
Select connection status again to verify that
connection to the router and Internet is active. Both
the router and internet icons will have green
backgrounds if connections are successful.
5. Skip the next section if connection to the home Wi-Fi
router, Internet and server were successful.
Troubleshooting Wi-Fi Connection
ROUTER / MODEM CHECK IF CONNECTION FAILS
1. Make sure the router and modem are turned on.
2. Check for connections to other wireless devices and
internet connection.
3. Make sure the thermostat's Wi-Fi is enabled and
connected to the home network (Router).
4. If having difficulty connecting to the router, online
research the router model number and/or internet
provider to discover and verify that the router band
is set to B, G or N bands. You will need to access the
routers utility program to make any changes. If not
accessible please contact your service provider for
help. The thermostat will connect to B, G or N band
routers at this time. NOTE: When set to B or G
bands, video streaming will likely be slower that N
band. If homeowner has implemented a dedicated N
band router for the purpose of video streaming, a
separate router for the thermostat may be required.
5. Reboot your router
A Unplug your power cord, wait 30 seconds, then
reconnect. If you have multiple routers, try
rebooting all of them when problems occur.
B If their are multiple routers you must have
different name and password for each one.

507428-01 10
C On your computer, turning Wi-Fi off and then
back on will force the system to rescan for
available networks. Do you see the network your
thermostat is trying to connect to?
6. Power cycle the thermostat.
7. Keep cordless phones, microwaves and other
electrical equipment at least 3.5 feet (1m) away from
access point.
A Try moving your router closer to the device if
possible. If connection is improved, then there is
probably some interference. Must have signal
stronger than -70db (also, see Router Signal
Strength on page 3); anything less will have
signal losses or not connect at all.
B Adjust the direction of the router toward the
thermostat. Adjust the routers antenna. A signal
repeater may be needed.
8. Try changing channels on the access point and test
it out with one of your internet devices (i.e. laptop,
desktop). The IP address to the server from the stat
will be close to the same IP address from the
computer to the server (www.mycomfortsync.com).
COMPUTER CONNECTIONS:
A On Access Point, Login to configuration (usually
web based interface) > go to Wireless Settings
and select a different channel > Save settings.
B Devices cannot change Wi-Fi channel. It is set
only at the router.
C On the thermostat, disable, then re-enable the
Wi-Fi connection.
9. Antenna in thermostat is fixed and cannot be moved.
Location of your access point with respect to the
thermostat is very important.
10. Baby monitors, garage door openers and wireless
video cameras may create signal interference.
11. Check your encryption key (Password).
12. Double check and re-enter your WEP/WPA
encryption keys / pass-phrases (usually found on
the router). If set to WEP security, change to WPA
if allowed.
13. In your thermostat's wireless settings, verify that
your encryption key (password) is correct. There can
not be spaces at the end of the SSID or Password.
14. It is important to note that number of walls that the
signal must pass thru to reach the thermostat can be
an issue. (e.g. 4 indoor walls, or 1 outdoor wall + 2
indoor walls could mean a weak signal at the
thermostat).
15. The addition of a signal repeater or extender maybe
an option. (Desktop or wall outlet plug-in devices are
available online or at your local electronics stores in
price range $70 - $150).
16. If multiple routers are in the home make sure each
router has a different name.