Setting The Fan; Selecting System Mode - Honeywell RTH8500 Series User Manual

Setting the fan

1 Press to select fan operation.
FAN
2 Press again to select ON or AUTO (toggle
FAN
to re-select). The selected option blinks.
3 Press to save setting. Your selection
DONE
appears under FAN.
ON: Fan is always on.
AUTO: Fan runs only when the heating or
cooling system is on.

Selecting system mode

1 Press
SYSTEM
2 Press
SYSTEM
You may need to press two or three times to
make a selection—the selected option blinks.
3 Press to save setting.
DONE
Possible system modes:
HEAT: Controls only the heating system.
COOL: Controls only the cooling system.
OFF: Heating/cooling systems are off.
AUTO: Selects heating or cooling
depending on the indoor temperature.
EM HEAT (heat pumps with aux. heat):
Controls auxiliary/emergency heat.
Compressor is locked out.
to display options.
again to select an option.
Note:
system settings may not
appear, depending on how
your thermostat was installed.
15
Inside
Inside
The AUTO and EM HEAT
33-00133ES—01
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