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68-0148—1 6
ADJUST FAN OPERATION SWITCH, AS
REQUIRED
The thermostat fan operation switch, labeled FUEL
SWITCH (see Fig. 12) is factory-set in the “F” position.
This is the correct setting for most systems. If this system is
an electric heat system, set the switch to “E.” The “E”
setting will allow the fan to turn on immediately with the
heating or cooling in a system where the “G” terminal is
connected.
Fig. 12—T8131 and T8132 back.
ADJUST SYSTEM ON-LENGTH, AS REQUIRED
The thermostat on-length is factory-set for a warm air,
gas or oil heating system. When installing it on another type
of system, adjust the on-length accordingly by setting screws
A and B on the back of the thermostat, using the heating
system table in Fig. 12 as a guide. To minimize room
temperature swings, optimize the on-length according to
the type of system. Adjusting the screw “out one turn”
means turning the screw approximately 360°, or about one
complete turn.
NOTE: These thermostats do not have a setting for steam/
gravity air. Cycles would not be long enough for accu-
rate temperature control.
NOTE: For condensing furnaces, follow manufacturer
instructions.
If you want a longer on-length, readjust the screws as
follows (refer to the heating system table in Fig. 12):
Use two AA alkaline batteries; nonalkaline batteries
will not last as long. We recommend Energizer batteries.
Make sure the thermostat is set to OFF position.
Use a coin to remove battery door (see Fig. 13).
Install the fresh batteries as shown, making sure positive
and negative terminals are oriented correctly (see Fig. 14).
Replace battery door.
T8132 Models
As the batteries are running low, a “bAt Lo” indicator
will flash for one to two months before batteries run out
completely. Replace the batteries as soon as possible after
the indicator starts flashing. If the batteries are not replaced
sometime during the flashing “bAt Lo” indicator, the indi-
cator will eventually stop flashing. When the batteries are
almost completely dead, “bAt Lo” will stay on without
flashing to indicate the thermostat and heating/cooling
system have stopped working.
The thermostat will not function after the batteries are
completely dead, and the “bAt Lo” indicator will disappear,
leaving a completely blank display.
Press down on left ends of batteries to remove. If the
new batteries are inserted within 20-30 seconds of remov-
ing the old ones, the thermostat will not require reprogram-
ming. However, if the display is blank, the batteries are
dead or incorrectly installed and the thermostat requires
reprogramming. See owner’s manual to reprogram.
T8131 Models
When the batteries are running low, the LED will display
“bAtLo” only when 24 Vac is not present, indicated by an
unlit LED.
T8131A,B,C; T8132A,B,C
INSTALLATION
R
W Y G
B
A
T8131 THERMOSTAT BACK
F
E
FUEL SWITCH
WARM AIR
FURNACE
HOT WATER
BOILER
ELECTRIC
FURNACE
A–IN
A–OUT
1 TURN
A–IN
ADJUST SCREWS THROUGH HOLES
TO SELECT OPERATION DESIRED
B–IN
B–IN
B–OUT
1 TURN
FUEL SWITCH
POSITION
F
F
E
HEATING SYSTEM
C
R
Rc
W Y G
B D
A C
T8132 THERMOSTAT BACK
M9348
DISPLAY °F
DISPLAY °C
C–IN
C–OUT
1 TURN
F
E
FUEL SWITCH
WARM AIR
FURNACE
HOT WATER
BOILER
ELECTRIC
FURNACE
A–IN
A–OUT
1 TURN
A–IN
ADJUST SCREWS THROUGH HOLES
TO SELECT OPERATION DESIRED
B–IN
B–IN
B–OUT
1 TURN
FUEL SWITCH
POSITION
F
F
E
HEATING SYSTEM
INSTALL BATTERIES
IMPORTANT: All T8132 models require batteries for
programming and operation of the thermostat and
heating/cooling system. Batteries are optional for
T8131 models, but are recommended to retain pro-
gram memory if ac power is lost.
If on-length screws A,B
are adjusted to match
this system:
For longer on-length,
readjust screws A,B
to match this system:
Electric furnace Warm air furnace
Warm air furnace Hot water boiler