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
69-1636-1

269-1636-1
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

569-1636-1
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).
1
2
1
1
1
2

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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.
1
2
1
1
1
2

969-1636-1
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

10 69-1636-1
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

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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 ; TEMPORARY
indicator shows on display; this is cancelled at next scheduled change, or to cancel sooner,
press .
Hold a temperature indefinitely (such as when you are on vacation)—press , ;
HOLD appears on display; to cancel, press .
Check Current Temperature Setting—press . (When using TEMPORARILY CHANGE or
HOLD, pressing this cancels your change.)
Warmer
Cooler
Temp
Run
Program
Warmer
Cooler
Temp
Hold
Temp
Run
Program
Run
Program

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Set
Schedule
Run
Program
Check Programs—press repeatedly to see each time and temperature; then press .
Cancel a program—press until program to cancel shows; then press together.
Permanently Change a program—Repeat steps in Heating Program or Cooling Program (page 9
and 10), as applicable.
Return to normal program or start program—press .
Set
Schedule
Ahead
Back
Time
Run
Program

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Adjust Fan Operation Switch
쐃The thermostat fan operation switch,
labeled FUEL SWITCH (see illustration on
page 14), is factory-set in the F position.
This is the correct setting for most
systems. If your system is an electric heat
system, set the switch to E. The E setting
allows the fan to turn on immediately with
the heating or cooling in a system where
the G terminal is connected.
Adjust System On-Time, ° F/ ° C
쐃The thermostat on-time is factory-set for
a warm air, gas or oil heating system. If
you are installing it on another type of
system, adjust the on-time accordingly by
setting DIP switches 1 and 2 on the back
of the thermostat. Use the heating
system table on the thermostat back as a
guide.
Optimize the system on-time according to the
type of system to minimize room temperature
swings.
In the unlikely event that you want a longer
furnace on-time, readjust DIP switches 1 and 2
as follows:
•Warm Air Furnace—set at the Hot Water
setting (1—OFF, 2—ON).
•Electric Furnace—leave at the Warm Air
Furnace setting (1—ON, 2—OFF).

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NOTE: This thermostat does not
have a setting for steam/
gravity air. Cycles would
not be long enough for
accurate temperature
control.
IMPORTANT
When using a high
efficiency furnace such as
a 90% or greater AFUE
(Average Fuel Utilization
Efficiency) unit, adjust
DIP switch 1 Off and
DIP switch 2 On.
M20638
R
W Y G
W Y G
C R R
THERMOSTAT BACK
DISPLAY F
DISPLAY C
3 - ON
3 - OFF
FE
FUEL SWITCH
WARM AIR
FURNACE 1 - ON 2 - ON F
1 - OFF 2 - ON F
1 - ON 2 - OFF E
FUEL SWITCH
POSITION
DIP SWITCH
POSITION
HEATING
SYSTEM
C
C
C
1
OFF ON
2
3
ON
1
2
3
HOT WATER OR
HIGH EFFICIENCY
ELECTRIC
FURNACE

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Set Fan and System Switches
First set the fan switch.
AUTO: Normal setting for most
homes. A single-speed fan turns
on automatically with the air
conditioner or furnace. A two-speed fan
usually runs on high with the air conditioner
and on low with the furnace.
Exception: If Fan Operation Switch on the back
of the thermostat is set to the E position (see
page 21), the fan operates with furnace only.
ON: The fan runs continuously. Use
for improved air circulation
during special occasions or for
more efficient electronic air cleaning. (In a
heat-only system, the fan runs continuously
only when the fan relay is connected to the
thermostat.)
Then set the system switch.
COOL: The thermostat
controls your air condition-
ing system.
OFF: Both the heating and air
conditioning systems are
off.
HEAT: The thermostat controls
your heating system.
Auto On
Auto On
HeatCool Off
HeatCool Off
HeatCool Off

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Install Batteries
IMPORTANT
Batteries must be installed for pro-
gramming and operating the thermo-
stat and heating/cooling system.
As the batteries are
running low, a
bAt Lo
indicator
flashes
for one to
two
months
before the
batteries run out
completely.
M1719C
REMOVING
BATTERY
DOOR
Replace the batteries as soon as possible after
the indicator starts flashing.
After the batteries are completely dead, the
bAt Lo indicator disappears, leaving the display
completely blank and the heating and/or
cooling system not operating.
•Use two AA alkaline batteries; nonalkaline
batteries do not last as long.
•Make sure the thermosat is set to the OFF
position.
•Use a coin to remove the battery door.

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To remove batteries, press down on the left ends
of batteries. If you insert the new batteries within
20 to 30 seconds of removing the old ones, you
do not need to reprogram the thermostat.
However, if the display is blank, the batteries are
dead or incorrectly installed and you need to
reprogram.
•Install the fresh batteries, as shown, making
sure positive and negative terminals are
oriented correctly.
•Replace the battery door.
INSTALL TWO AA ALKALINE
BATTERIES AS SHOWN
M1713

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Troubleshooting Guide
IF… THEN…
Display will not come on. ■Check that the green light emitting diode (LED)
located to the left of the LCD is lit, indicating the
thermostat is powered properly.
Temperature display will not go lower ■You have reached the temperature setting limit.
than 45°F (7°C) or higher than 88°FThe setting range is 45°F to 88°F (7°C to 31°C).
(31°C) during programming.
Temperature change occurs at the ■Check the program times for the period in
wrong times. question. Be sure that AM and PM indications are
correct. Make sure the current day and time are
correct. Reprogram if necessary.
Heating will not come on. ■Check that the green LED is lit.
■Check that the switch on the thermostat is set to
HEAT.

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Heating will not come on (Cont). ■Check the system fuse or circuit breaker and
replace or reset, if necessary.
■Check for correct wiring and good connections.
■If temperature setting is higher than current
temperature and displays HEAT, contact Honeywell
Customer Relations at 1-800-468-1502.
Cooling will not come on. ■Check that the green LED is lit.
■Check that the switch on the thermostat is set to
COOL.
■Check the system fuse or circuit breaker and
replace or reset, if necessary.
■Check for correct wiring and good connections.
■The thermostat has a built-in time delay on cooling.
Allow five to ten minutes after changing the setting
before the air conditioner starts.

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Cooling will not come on (Cont). ■If temperature setting is lower than current
temperature, and displays COOL, move system
switch from COOL to OFF for ten minutes. After
ten minutes, return switch to COOL position. If the
air conditioner comes on, compressor could have
reached its high limit temperature protection and
shut down. If the air conditioner does not come on
after ten minutes and displays COOL, contact
Honeywell Customer Relations at 1-800-468-1502.
The house is too warm or too cool. ■Press Present Setting key to check the current
temperature setting.
■If desired, change the temperature setting. See
page 11.
SYSTEM ON indicator is lit, but no ■Allow time for the furnace to heat up and the fan to
heat is coming from the registers. come on before checking for heat at the register.
(Check to make sure system on-time is set
correctly according to pages 13 and 14.)