Honeywell T8131A User manual

OWNER’S GUIDE
T8131A,B Programmable Thermostat
Weekday/Weekend (5-day/ 2-day)
Programmable Heat and/or Cool
Low Voltage (20 to 30 Vac)
Thermostat and Mounting Plate
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Welcome to the world of comfort and energy
savings with your new Honeywell program-
mable thermostat.
By following the programing instructions in this
manual, your new thermostat will automatically
control the temperature in your home, keeping
you comfortable while saving energy.

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Table of Contents
Page
Program the Thermostat ................................................................................................................. 4
Adjust Fan Operation Switch........................................................................................................... 13
Adjust System On-Time, °F/°C........................................................................................................ 13
Set Fan and System Switches ........................................................................................................ 18
Install Batteries................................................................................................................................ 19
Troubleshooting Guide .................................................................................................................... 21
Limited One-Year Warranty ............................................................................................................. 22
Customer Assistance ...................................................................................................................... 24

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Program the Thermostat
When batteries are installed, your thermostat
can be programmed in your hand, before it is
mounted on the wall.
If you would prefer to program the thermostat
after it is mounted on the wall, (see Mount
Thermostat section), and return later to this
programming section.
Refer to the personal Program Schedule
section to program your time and temperature
settings for various times of the day.
Four time periods are available during week-
days—WAKE, LEAVE, RETURN, and SLEEP.
During weekends, only the WAKE and SLEEP
time periods are available. These periods can
be seen individually on the display as you
press the Set Schedule key.
WAKE is the time period you want the house at
a comfortable temperature when you get up
and 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.)
LEAVE is the time period you can set for an
energy-saving temperature while you are away

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at work or school. (This will be a lower tem-
perature during heating season, or a higher
temperature during cooling season.)
RETURN is the time period 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.)
SLEEP is the time period you can set for an
energy-saving temperature while you are
sleeping. (Again, lower for heating or higher for
cooling. For more comfortable sleeping, some
homeowners choose not to raise the cool
temperature during the night.)
You will set one schedule for weekdays and
another for weekends, because your require-
ments are probably different for each.
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

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it. For example, a house that is occupied during
weekdays would only require programs for
WAKE and SLEEP.
Before programming, remove the clear plastic
overlay covering the display.
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, 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).
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COOLING PROGRAM SCHEDULE
Weekdays Start Time Cooling 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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This guide can be used for programming your new thermostat.
NOTE: Batteries are required for operation and programming. When inserting batteries, set the
system switch to OFF. Remove the battery door (on the thermostat left side) using a coin
at the bottom. Follow the instructions on pages 16 and 19.
Set Current Time/Day
To set the time, press and release once, until current time shows; to set day, press
and release again, until current day shows; then press .
Heating Program
With system switch at HEAT, press and release once. WAKE, MON-FRI and SET appear on
the display.
Set
Clock/Day
Set
Clock/Day
Time
Ahead
Back
Ahead
Back
Time
Run
Program
Set
Schedule

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Ahead
Back
Time
Warmer
Cooler
Temp
Use 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 the display. Use to program
WAKE time and 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.
Set
Schedule
Ahead
Back
Time
Warmer
Cooler
Temp
Run
Program