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Step 11. Set Fan and System Switches
First set the Fan switch.
Fan Auto: Normal setting for most
homes. A single-speed fan will
turn on automatically with the air
conditioner or furnace. A two-speed fan
usually runs on high with the air conditioner
and on low with the furnace.
Fan On: The fan runs continuously.
Use for improved air circulation
during special occasions or for
more efficient electronic air
cleaning. (In a heat-only system, fan runs
continuously only if fan relay is connected to
the thermostat.)
Then set the System switch.
Cool: The thermostat controls
your air conditioning
system.
Off: Both the heating and air
conditioning systems are
off.
Heat: The thermostat
controls your heating
system.
Auto On
Auto On
HeatCool Off
HeatCool Off
HeatCool Off