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Step 5. Adjust Fan Operation
Switch, As Required
❑
The thermostat fan operation switch, labeled
FUEL SWITCH (see illustration) 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 to allow the
fan to turn on immediately with the heating in
a system when the G terminal is connected.
Step 6. Adjust System On-Time,
°F/°C, As Required
❑
The 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 screws A
and B on the back of the thermostat. Use the
heating system table shown in the illustration
as a guide. The system on-time should be
optimized according to the type of system to
maximize comfort. Setting the screw “out one
turn” means turning the screw approximately
360° counterclockwise, or about one com-
plete turn.
R
Rc
W Y G
B D
A C
THERMOSTAT BACK
M8796A
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