Honeywell T8131C User manual

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Weekday/Weekend
Programmable Heat and/or Cool
Thermostat and Mounting Plate
OWNER’S GUIDE
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/
T8131C
Programmable Thermostat

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Welcome to the world of comfort and energy
savings with your new Honeywell Trol-A-Temp®
programmable thermostat.
Your new T8131 Thermostat is designed to
provide you with reliable, precise temperature
control. By following the simple programming
instructions in this manual, your thermostat will
automatically control the temperature in your
home. Temperature control saves energy and
allows you to awake (or return home) to a
comfortable level of heating or air conditioning.
Direct questions concerning the operation of
this thermostat to Honeywell Customer
Assistance at 1-800-468-1502, Monday-Friday,
7:00 a.m.-5:30 p.m., Central time.

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Table of Contents
Page
Programming Thermostat ............................................................................................................... 4
Program Schedule .......................................................................................................................... 6
T8131C Programming Guide .......................................................................................................... 8
Setting Fan and System Switches .................................................................................................. 12
Installing Batteries........................................................................................................................... 13
Troubleshooting Guide.................................................................................................................... 15
Limited One-Year Warranty.................................................................................... Inside Back Cover

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Programming Thermostat
NOTE: When batteries are installed, your
T8131 Thermostat can be pro-
grammed in your hand (armchair
programming), or when it is mounted
on the wall. Batteries are not required
for normal thermostat operation;
however, installed batteries are
recommended to retain your personal
temperature program in memory if ac
power is lost. See Installing Batteries
section.
When you program the thermostat, set one
schedule for weekdays and another for week-
ends, because your temperature requirements
probably vary. (During weekends, only the
WAKE and SLEEP time periods are available.)
Use the personal Program Schedule for
planning your program schedule of time and
temperature settings for various times of the
day.
Four time periods are available during week-
days —WAKE, LEAVE, RETURN, and
SLEEP. View these periods individually on the
display when you press the Set Schedule key.
Select WAKE if you want the house at a
comfortable temperature when you get up, while
you get ready for work or school. When deciding
what time to set for your WAKE period, include
extra lead time, depending on the outside
temperature and your furnace response time, to
give the furnace a head start to heat the house
before you get up. (This will be a higher
temperature during heating season, or a lower
temperature during cooling season.)

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Select LEAVE if you want an energy-saving
temperature while you are away at work or
school. (This will be a lower temperature during
heating season, or a higher temperature during
cooling season.)
Select RETURN if you want the house at a
comfortable temperature for activities before
bedtime. When deciding what time to set for
your RETURN period, include extra lead time,
depending on the outside temperature and
your furnace response time, to give the furnace
a head start to heat the house before you
arrive home. (Again, higher for heating or lower
for cooling.)
Select SLEEP if you want an energy-saving
temperature while you are sleeping. (For more
comfortable sleeping, some people choose not
to raise the cool temperature during the night.)
Fill in the times and temperatures you desire
for weekdays and weekends. If you decide not
to program the thermostat, it automatically
controls heating at 68°F (20°C) and cooling at
78°F (26°C), 24 hours a day. Also, you do not
need to enter a time and temperature program
for all periods if your schedule does not require
it. For example, a house that is occupied
during weekdays would not require programs
for LEAVE and RETURN.
When pressing the keys, use the ball of your
finger or a soft pencil eraser.
NOTE: Using sharp fingernails or pencil
points can damage the keypad.
If you make an error at any time during
programming, just press the Run Program
key, and continue again at the last step.

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Program Schedule
HEATING PROGRAM SCHEDULE
Weekdays Start Time Heating Temperature
WAKE
LEAVE
RETURN
SLEEP
Weekends
WAKE
SLEEP
WAKE and RETURN start times should include extra lead time, based on outside temperature
and furnace response time, to give your furnace a head start to heat the house.
The temperatures cannot be set any higher than 88°F (31°C) or any lower than 45°F (7°C).
1
1
1
1
2
2

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COOLING PROGRAM SCHEDULE
Weekdays Start Time Heating Temperature
WAKE
LEAVE
RETURN
SLEEP
Weekends
WAKE
SLEEP
WAKE and RETURN start times should include extra lead time, based on outside temperature
and furnace response time, to give your furnace a head start to heat the house.
The temperatures cannot be set any higher than 88°F (31°C) or any lower than 45°F (7°C).
NOTE: If you decide not to program the thermostat, it automatically controls heating at 68°F
(20°C) and cooling at 78°F (26°C), 24 hours a day.
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1
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2
2

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T8131C Programming Guide
NOTE: Batteries are required only for armchair programming, and to retain your personal tem-
perature schedule in memory if ac power is lost. When replacing batteries, set the system
switch to OFF. Remove the battery door (on the thermostat left side) using a coin at the
bottom. Follow instructions in Installing Batteries section.
Set Current Time/Day
To set time, press and release once, and press until current time shows; to set
day, press and release again, and press until current day shows; then press .
Heating Program
With system switch at HEAT, press and release once. WAKE, MON-FRI and SET appear
on display.
Ahead
Back
Set
Clock/Day
Set
Clock/Day
Ahead
Back
Weekday
Schedule
Run
Program

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Warmer
Cooler
Press to program WAKE time and to program WAKE temperature for Mon-Fri.
Repeat sequence for LEAVE, RETURN, and SLEEP.
Press until SAT SUN, WAKE and SET appear on display. Press to program
WAKE time and press to program WAKE temperature for Sat-Sun. Repeat sequence for
SLEEP.
Cooling Program
With system switch at COOL, follow the same instructions as for the Heating Program.
After programming, adjust fan and system switches, as desired. Press and release to start
the program.
Ahead
Back
Weekend
Schedule
Ahead
Back
Warmer
Cooler
Run
Program

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A quick guide for operating or making changes follows:
NOTE: Set system switch to HEAT or COOL to perform the following:
Temporarily Change temperature for current period only—press ; temperature cancels
itself at next scheduled change; to cancel sooner, press .
Hold a temperature indefinitely—press , ; to cancel, press .
Check Current Temperature Setting—press .
Check Programs—press then repeatedly to see each time and temperature; then
press .
Warmer
Cooler
Run
Program
Hold
Temp
Warmer
Cooler
Run
Program
Present
Setting
Weekday
Schedule
Weekend
Schedule
Run
Program