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STEP 5
Adjust Fan Operation Switch, As Required
The thermostat fan operation switch, labeled
FUEL SWITCH (see figure on page 17) is factory-
set in the "F" position. This is the correct setting for
most systems. If your system is an electric heat
STEP 6
Adjust System On-Length As Required
The thermostat on-length is factory-set for a
warm air, gas or oil heating system. If you are
installing it on another type of system, the on-length
must be adjusted accordingly by setting screws A
and B on the back of the thermostat, using the
heating system table in the figure
In the rare event that you want a longer on-length, you may readjust the screws as follows:
If on-length screws A,B are adjusted
to match this system:
electric furnace
warm air furnace
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.
(page 17) as a guide. The on-length should be
optimized according to the type of system to
minimize room temperature swings. Setting the
screw "out one turn" means turning the screw
approximately 360°, or about one complete turn.
For longer on-length, readjust screws A,B
to match this system:
warm air furnace
hot water boiler
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