Honeywell RCT8100 Operating Manual page 11

RCT8100 Programmable Thermostat
Select the fan setting
Use the Fan switch to select the fan mode of operation.
The fan runs only when heating or cooling is activated. However, if you have a gas or fuel
Auto
oil furnace, when heating is activated, the fan will start only when the air coming out of the
vents is warm enough. The fan will keep on running after heating stops until the air is no
longer warm enough.
On
The fan runs all the time.
NOTE: The Fan switch is not used if the fan is not connected to the thermostat.
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