Step 11. set the fan and system key – Honeywell CT3550 User Manual
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STEP 11. SET THE FAN AND SYSTEM KEY
Set the Fan Key
Fan On: The fan runs continuously. Use for improved air circulation or more efficient central air cleaning. (In a heat
only system, the fan runs continuously only if the fan relay is connected to the G thermostat terminal).
Press
until
display shows On.
Fan Auto: Normal setting for most homes. The equipment controls the fan operation.
Press
until
display shows Auto.
NOTE:
If you set the fan to On during normal operation, the fan reverts to the programmed fan setting when the
next program period begins.
Set the System Key
Heat: The thermostat controls your heating system.
Press
until
display shows Heat.
Off: Both the heating and air conditioning systems are off.
Press
until the display shows Off.
Cool: The thermostat controls your air conditioning system.
Press
until the display shows Cool.
Fan
Fan
System
System
System