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Step 11. Set The Fan And System Key - Honeywell CT3550 Owner's Manual

Weekday, saturday and sunday programmable heat and/or cool low voltage (20 to 30 vac) thermostat and wallplate
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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).
Fan
Press
until display shows On.
Fan Auto: Normal setting for most homes. The equipment controls the fan operation.
Fan
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.
System
Press
until display shows Heat.
Off: Both the heating and air conditioning systems are off.
System
Press
until the display shows Off.
Cool: The thermostat controls your air conditioning system.
System
Press
until the display shows Cool.
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