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6
INSTALLATION 69-0653-6
Step 4. Set the thermostat for your type of heating system
a. Use the FUEL SWITCH on the back of the thermostat to set
your new thermostat for the type of fuel that your heating
system uses: F–gas or oil, or E–electricity.
Note:
This setting enables proper fan operation.
b. Use the A and B screws on the back of the thermostat to set
your new thermostat for your type of heating system. See the
Heating System Table on the next page to find the correct
settings.
Note
: These screws are factory-set for a warm air, gas, or oil
heating system.
c. The thermostat is set to display the temperature in degrees
Fahrenheit (
°F
)
. If you want to display the temperature in
degrees Celsius (
°C
)
, adjust screw C out one turn.
d. You can install the batteries and program your thermostat now,
or you can wait until the thermostat is mounted on the wall. To
install the batteries, see the instructions on page 8. To program
the thermostat, see the instructions that begin on page 12.
IMPORTANT:
Setting your thermostat correctly for your type of
heating system allows it to maintain accurate temperature control,
minimize swings in the temperature of the room, and efficiently run
the fan.
Fig. 8
R
Rc
W Y G
B D
A C
THERMOSTAT BACK
M20145
DISPLAY F
DISPLAY C
C–IN
C–OUT
1 TURN
FOR HIGH EFFICIENCY FURNACE (90%+ AFUE)
ADJUST: SCREW A–OUT ONE TURN
SCREW B–IN
FUEL SWITCH – F POSITION
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
FUEL SWITCH
HEATING
SYSTEM TYPE
SELECTING ºF OR ºC