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

Page 11
Cancel a Schedule Period
You may wish to cancel a period to match your lifestyle. For
example, if someone is always home during the day on Tues-
day, you can cancel the LEAVE and RETURN periods to
have the thermostat hold the WAKE temperature until the
SLEEP period is reached.
1 − Press the SCHED key. The SCHEDULE screen will be
displayed.
2 − Press the EDIT key. The screen will change to display the
days of the week across the top.
3 − Select the day or days of the week that are affected by
the schedule change.
4 − Press the schedule period you want to cancel: WAKE,
LEAVE, RETURN or SLEEP. Once selected the period will
flash to show it is selected.
5 − Press the CANCEL key. The time, temperature(s) and
fan settings will all dissappear from the screen. The bar
above the selected period is removed to indicate that the se-
lected period was cancelled.
6 − Press DONE key.
NOTE − A schedule period may be reinstated at any time by
entering the schedule edit screen, selecting the period and
pressing the arrow keys to set the desired time and tempera-
tures.
MON SUN
FAN
HEAT
COOL
OK TO PICK MULTIPLE DAYS
DONE WAKE LEAVE RETURN CANCELSLEEP
TUE WED THU FRI SAT

Page 12
Set the Time
1 − Press the CLOCK key. The current time setting will be dis-
played as shown below.
2 − Use the arrows to set the correct time.
3 − Press DONE key.
IMPORTANT − The current day of the week should be displayed
correctly on this screen. If not, refer to the Advanced Settings
section to correct the day of the week display.
DONE
TUE
AM
CANCEL

Page 13
Override Temperature SettingTemporary Hold
You may use the temporary hold function to override the pro-
grammed temperature setting until the next scheduled period
or until a particular time that you wish.
1 − Press the UP or DOWN arrow next to the temperature
display to adjust the temperature as desired.
NOTE − Hold Temperature Until" appears on the screen. The
currently programmed start time of the next scheduled period
also appears, as does an additional set of arrows.
2 − Use the UP and Down arrows next to the displayed
time to set the time that you wish for the thermostat to
resume the schedule.
NOTE − The time arrows are displayed for approximately
seven seconds. Press the screen where the hold temperature
time is shown to allow the arrows to reappear.
3 − Press CANCEL or SCHED key to cancel temperature
hold and resume schedule.Following Schedule" appears
on the screen to indicate that the temporary hold has ended.
TUE
PM
FAN
AUTO
SYSTEM
HEAT
Inside
Hold Temperature
Until
Set To
SCHED HOLD CLOCK SCREEN
CANCEL

Page 14
Override Temperature SettingPermanent Hold
The permanent hold function overrides the programmed temper-
ature setting until the permanent hold is cancelled.
1 − Press the HOLD key.
NOTE − Permanent Hold" appears on the screen under the cur-
rent time.
2 − Use the UP and Down to adjust the temperature to the
setting that you want the thermostat to hold.
3 − Press CANCEL key to cancel permanent hold and re-
sume schedule.Following Schedule" appears on the
screen to indicate that the hold has ended.
TUE
AM
FAN
AUTO
SYSTEM
HEAT
Inside Set To
Permanent
Hold
SCHED HOLD CLOCK SCREEN
CANCEL

Page 15
Override Temperature SettingVacation Hold
You may use the vacation hold function to override the pro-
grammed temperature setting for a designated number of days.
1 − Press the UP or DOWN arrow next to the temperature
display to adjust the temperature as desired.
NOTE − Hold Temperature Until" appears on the screen. The
currently programmed start time of the next scheduled period
also appears, as does an additional set of arrows. This is the time
of day that the override will expire after the hold period ends.
2 − Press the HOLD key twice. Screen shows Hold Tempera-
ture Until" one day.
3 − Press the UP and DOWN arrows to adjust the number of
days you would like to override the schedule.
NOTE − Arrows used to adjust the number of days are displayed
for approximately seven seconds. Press the screen where the
number of days are shown to allow the arrows to reappear.
4 − Press the CANCEL key to cancel the vacation override
early.
NOTE − When the programmed vacation hold expires, the
screen displays Following Schedule" to indicate that the hold
has ended.
SYSTEM
SCHED CLOCK SCREEN
CANCEL
THU
FAN
AUTO
HEAT
Inside
DAYS
Hold Temperature
Until
Set To

Page 16
Temperature Recovery Feature
Your thermostat is equipped with a feature that accommodates
recovery time to ensure your comfort.
Recovery time is the time that it takes your heating and cooling
equipment to recover from energy−saving settings programmed
during away or asleep periods. Recovery time depends on local
weather, your schedule, the contruction of your home and your
heating and/or cooling equipment.
Your thermostat tracks the time that it takes for your system to
reach your desired settings (recovery period). This allows the
thermostat to accommodate this recovery period and to ensure
your comfort at the programmed wake and return settings.
For example, your WAKE period is programmed for 6:00 a.m.
and 70°F. The thermostat activates heating in advance of 6:00
a.m. to ensure that your desired comfort setting of 70°F is
reached by the time you awake.
A recovery notice is displayed when the system is operating be-
fore the scheduled time.
AM
FAN
HEAT
Se ot T
Following
Schedule
SCHED HOLD CLOCK SCREEN MORE
Inside
TUE
RECOVERY
AUTO
SYSTEM

Page 17
Clean the Thermostat Screen
The thermostat screen may be cleaned, if necessary.
1 − Press the SCREEN key. The thermostat locks the touch
screen for 30 seconds to allow for cleaning.
2 − Use a damp cloth slightly moistened with water or
household glass cleaner to clean the screen.
IMPORTANT − Do not spray any type of liquid directly onto the
thermostat. Spray the water or household glass cleaner on a
cloth, then use the cloth to clean the thermostat screen.
3 − Repeat the above steps as necessary.
4 − Press the DONE key to return to the home screen and
normal operation.
OK TO
CLEAN
SCREEN
DONE

Page 18
Battery Replacement
If your thermostat has batteries, a low battery warning flashes on
the home screen for approximately 30 days.
IMPORTANT − Batteries should be replaced once per year to
prevent leakage and to prevent loss of battery back−up in a pow-
er outtage. You may also wish to replace the batteries prior to
leaving your home for more than a month.
1 − When the low battery indicator is flashing, replace the
batteries promptly with three fresh AAA alkaline batter-
ies.
2 − Remove the thermostat from the wallplate by pulling
straight out.
WALL

Page 19
Battery Replacement (Continued)
3 − Remove the old batteries and insert three fresh AAA al-
kaline batteries, as marked on the thermostat.
BACK OF THERMOSTAT
BATTERIES (3)
+
++
4 − Align the terminal screw blocks with the pins on the
back of the thermostat.
5 − Push the thermostat straight onto the wallplate until it
snaps into place.
PINS ON
BACK OF
THERMOSTAT
WALLPLATE
TERMINAL
SCREW
BLOCK

Page 20
Reminder Timers
The reminder timers notify you when it is time to change the fur-
nace filter, humidifier pad or ultraviolet lamp. When one of the set
timers expires, a reset key appears on the home screen.
Reset Timers
1 − Change" reminder appears on the screen when the
timer expires.
2 − Press the RESET key to restart the timer. If more than
one timer expires at the same time, press the RESET key
until all timers have been reset.
SCHEDHOLDCLOCKSCREENMORE
PM
FAN
AUTO
SYSTEM
HEAT
RESET
Following
Schedule
CHANGE FILTER
Set to
Inside
MON SUN
TUE WED THU FRI SAT
View or Reset Timer Settings Before They Expire
1 − Press the MORE key until the timer you want to modify
appears on the screen.
2 − Press the EDIT key to change the Timer Reload Value.
Use the UP or DOWN arrow keys to change the number of
run time days. See the Advanced Settings section, step 8
through 10 for more information.
3 − Press the DONE key to return to the selected timer.
4 − Press the RESET key to reset the timer to the Timer Re-
load Value.
5 − Press DONE or CANCEL key to return to home screen.