Adjust Fan Operation Switch; Adjust System On-Time, F/ C - Honeywell T8131A Owner's Manual

Adjust Fan Operation Switch

The thermostat fan operation switch,
labeled FUEL SWITCH (see illustration on
page 21), 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
allows the fan to turn on immediately with
the heating or cooling in a system where
the G terminal is connected.

Adjust System On-Time, F/ C

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 21)
as a guide.
Optimize the system on-time according to the
type of system to minimize room temperature
swings. Setting the screw out one turn means
turning the screw approximately 360 counter-
clockwise, 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:
First, turn in both screws completely, then
adjust for system type:
• Warm Air Furnace—set at the Hot Water
setting (A—out one turn, B—leave in).
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