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Operating Your Comfort Control
Setting Fan and System Keys
SETTING FAN KEY
The Fan key selections vary based on your heating and/or cooling system type.
On — fan runs continuously. Use this setting for improved air circulation or for more efficient central
air cleaning.
Auto — fan follows fan program schedule. See Fan Schedule section for more information.
Circ — fan runs randomly approximately 35% of time. Use this setting for improved air circulation or
for more efficient central air cleaning when you do not want the fan running continuously.
SETTING SYSTEM KEY
The System key selections vary based on your heating and/or cooling system type.
Heat — controls your heating system.
Off — both heating and cooling systems are off.
Cool — controls your cooling system.
Auto (when enabled) — controls both your heating and cooling system based on temperature.
Em. Heat (heat pump systems only) — controls emergency heat and auxiliary heat, if needed.
Heat pump is not operational.
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