Lennox ComfortSense L5711U User manual

E2007 Lennox Industries Inc.
Dallas, Texas, USA
ComfortSenset5000 Series Models L5711U
and L5732U Programmable Touch Screen
Thermostats
OWNER’S
GUIDE
IMPORTANT
Read and save these instructions.
506067−01
2/2008

Page 2
Table of Contents
Thermostat Features Page 2. . . . . . . . . . . . . . . . . . . . . . . . . .
Thermostat Display Page 3. . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Settings Page 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fan Settings Page 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Program Your Heating and Cooling Schedule Page 7. . . . .
Fan Schedule Page 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cancel a Schedule Period Page 11. . . . . . . . . . . . . . . . . . . . . . .
Set the Time Page 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Override Temperature Setting Temporary Hold Page 13. . . . .
Override Temperature Setting Permanent Hold Page 14. . . .
Override Temperature Setting Vacation Hold Page 15. . . . . .
Temperature Recovery Feature Page 16. . . . . . . . . . . . . . . . . . .
Clean the Thermostat Screen Page 17. . . . . . . . . . . . . . . . . . . .
Battery Replacement Page 18. . . . . . . . . . . . . . . . . . . . . . . . . . .
Reminder Timers Page 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Built−In Compressor Protection Page 21. . . . . . . . . . . . . . . . . . . .
Outdoor Temperature Page 22. . . . . . . . . . . . . . . . . . . . . . . . . . .
Advanced Heat Pump Features Page 22. . . . . . . . . . . . . . . . . . .
Screen Lock Page 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Advanced Settings Page 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting Tips Page 29. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermostat Features
SLarge, clear display with backlight shows the current tem-
perature, the current temperature setting and the time −−
even in the dark.
SMenu−driven programming makes set−up effortless.
STouch screen interaction.
SReal−time clock keeps time during power failures and auto-
matically converts to daylight savings time.
SSaving Changes" notification assures you that changes
have been saved.
SChange / check reminders let you know when it is time to
replace filters, UV lamps, batteries, etc.

Page 3
SOverride options allow you to easily override the pro-
grammed schedule.
SSame−schedule programming allows you to program a
schedule for several days at once. No need to copy.
SArmchair programming allows you to remove the thermo-
stat from the wall while you program your schedules.
Thermostat Display
SYSTEM
SELECT EMERGENCY HEAT,
HEAT, OFF OR COOL
FAN
SELECT AUTO,
ON OR CIRC
SCHED
SELECT TO
ENTER SCHED-
ULE MODE
HOLD
SETS A PERMANENT HOLD AND
ACTIVATES VACATION HOLD
CLOCK
USED TO SET
TIME FORWARD
OR BACK
MORE
SHOWS FURNACE FILTER,
UV LIGHT OR HUMIDIFIER
PAD CHANGE REMINDER
SCREEN
LOCKS TOUCH SCREEN
FOR CLEANING
DOWN ARROW
LOWERS
TEMPERATURE
SETTING
UP ARROW
RAISES
TEMPERATURE
SETTING
AM
FAN
SS MY TE
HEAT
Se ot T
AUTO

Page 4
Thermostat Display (Continued)
TUE
SHOWS CURRENT
DAY OF THE WEEK
FAN
SHOWS FAN
SETTING
INSIDE
SHOWS CURRENT
INSIDE TEMPERATURE
SET TO
SHOWS CURRENT
TEMPERATURE
SETTING
SYSTEM
SHOWS
CURRENT
SYSTEM
POSITION
TIME
SHOWS CURRENT
TIME OF DAY, HOLD
TIME REMAINING OR
NUMBER OF VACATION
DAYS REMAINING
FOLLOWING
SCHEDULE
INDICATES THAT
THERMOSTAT IS
FOLLOWING THE
PROGRAMMED
SCHEDULE
AM
FAN
SS MY TE
HEAT
Se ot T
TUE
OUTSIDE
SHOWS CURRENT
OUTSIDE TEMPERATURE
(IF SYSTEM INCLUDES
OUTSIDE TEMPERATURE
SENSOR)
AUTO

Page 5
System Settings
PRESS SYSTEM
SELECT SETTING OF HEAT,
OFF, COOL OR EM HEAT
(HEAT PUMP SYSTEMS ONLY)
AM
FAN
SS MY TE
HEAT
Se ot T
Following
Schedule
SCHED HOLD CLOCK SCREEN MORE
Inside
TUE
Outside
AUTO
SYSTEM SETTINGS
The system setting options vary based on your heating and/or
cooling type.
HEAT  Thermostat controls heating system.
OFF  Both heating and cooling systems are off.
COOL  Thermostat controls cooling system.
AUTO  The thermostat switches the system from the heat-
ing mode to the cooling mode based on temperature.
EM HEATHeat pump systems only −− Thermostat controls
emergency heat and auxiliary heat, if needed. Heat pump com-
pressor is not operational.

Page 6
Fan Settings
PRESS FAN.
SELECT SETTING:
ON, AUTO OR CIRC.
AM
FAN
SS MY TE
HEAT
Se ot T
Following
Schedule
SCHED HOLD CLOCK SCREEN MORE
Inside
TUE
Outside
AUTO
FAN SETTINGS
ON  Fan runs continuously. Use this setting for improved
air circulation or for more efficient central air cleaning.
AUTO  Fan runs only when heating or cooling system is on.
CIRC  Fan runs randomly approximately 35% of the time.
Use this setting for improved air circulation or for more efficient
central air cleaning when you do not want the fan to run continu-
ously.

Page 7
Program Your Heating and Cooling Schedule
NOTE − The thermostat includes a battery which makes it pos-
sible for you to remove the thermostat from the wallplate during
program. See page 19.
Your thermostat can control up to four different schedule periods
per day:
Wake  Time when you awaken and want your home at a
comfortable temperature.
Leave  Time when you leave the home and prefer an ener-
gy−saving temperature setting.
Return  Time when you return home and want your home to
return to a more comfortable temperature setting.
Sleep  Time when you are asleep and prefer an energy−
saving temperature setting.
NOTE − Schedule times are in 15−minute intervals.
EDIT THE SCHEDULE:
1 − Press the SCHED key. The SCHEDULE screen will be dis-
played.
2 − Press the EDIT key. The screen will change to display the
days of the week across the top.
MON TUE WED THU FRI SUN
OK TO PICK MULTIPLE DAYS
CANCEL
SAT

Page 8
Program Your Heating and Cooling Schedule (Cont.)
3 − Select any combination of days to edit. You may select
multiple days. These should be days that you wish to follow
the same schedule. Check marks appear next to the days
that are selected. After the first day is selected, the SCHED-
ULE screen returns to the display.
4 − Press the WAKE key. The WAKE key will flash to show it
is selected.
5 − Press the UP and DOWN keys to modify time and heat
and cool temperatures shown on the screen.
6 − Press LEAVE key and repeat step 5.
7 − Press RETURN key and repeat step 5.
8 − Press SLEEP key and repeat step 5.
MON TUE WED THU FRI SUN
AM
FAN
CIRC
CANCEL
PERIOD
HEAT
COOL
OK TO PICK MULTIPLE DAYS
DONE WAKE LEAVE RETURN SLEEP
CANCEL
SAT

Page 9
Program Your Heating and Cooling Schedule (Cont.)
NOTE − The FAN setting can be programmed for ON, AUTO or
CIRC for each period selected. See following page for more in-
formation about fan setting options.
9 − Press DONE key when finished. Saving changes screen
appears to indicate that schedule changes are being saved
to the days selected.
10 − Repeat steps 1 through 9 to set a program schedule for
the remaining days of the week. Example: If Mon − Fri was
selected first, repeat steps 1 through 9 to program Sat and
Sun.
NOTE − To exit the schedule without saving changes, press
CANCEL key at any time.
MON TUEWEDTHUFRI
SAVING CHANGES

Page 10
Fan Schedule
The FAN setting can be programmed for ON, AUTO or CIRC for
each period selected:
ON  Fan runs continuously. Use this setting for improved
air circulation or for more efficient central air cleaning.
AUTO  Fan runs only when heating or cooling system is on.
CIRC  Fan runs randomly approximately 35% of the time.
Use this setting for improved air circulation or for more efficient
central air cleaning when you do not want the fan to run continu-
ously.
Fan Status Display on Home ScreenIf the fan program is
scheduled, AUTO is displayed as the fan setting, along with the
particular fan setting that has been programmed. For example, if,
during the WAKE period, the Fan has been set to AUTO, then
AUTO is shown as the fan setting. However, if, during the WAKE
period, the Fan has been set to ON, both AUTO and ON are dis-
played. AUTO indicates that the fan has been scheduled and ON
indicates that the fan has been scheduled to be ON.
Manually Override Scheduled Fan SettingIf the fan setting
is scheduled, press the FAN key, then press the desired fan set-
ting to manually override the scheduled fan setting. Fan opera-
tion will return to the programmed operation when the next
schedule period begins.
SCHED HOLD CLOCK SCREEN
THU
AM
FAN
SYSTEM
HEAT
Following
Schedule
Inside Set To
ON
AUTO