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Step 5. Adjust Fan Operation Switch, As Required
❑ The thermostat fan operation switch, labeled FUEL SWITCH (see illustration on page 19) 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 will allow the fan to turn on immediately
with the heating or cooling in a system where 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 (page 19)
as a guide. The system on-time should be optimized according to the type of system to minimize
room temperature swings. Setting the screw “out one turn” means turning the screw approxi-
mately 360° counterclockwise, or about one complete turn.
In the unlikely event that you want a longer furnace on-time, readjust screws A and/or B as
follows:
