Step 12. Set The Fan And System Switches - Honeywell CT3500 Owner's Manual

STEP 12. SET THE FAN AND SYSTEM SWITCHES

First set the fan switch.
Then set the system
switch.
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Fan On: The fan runs continuously. Use for improved air
circulation or for more efficient central air cleaning. (In a
heat-only system, fan runs continuously only if fan relay is
connected to the G thermostat terminal).
Fan Auto: Normal setting for most homes. The equipment
controls the fan operation.
Heat: The thermostat controls your heating system.
Off: Both the heating and air conditioning systems are off.
Cool: The thermostat controls your air conditioning system.
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On
Auto
Fan
On Auto
Fan
Heat Off Cool
System
Heat Off
System
Heat Off Cool
System
Cool