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Usage Key
❑ Press once to display the hours and minutes that the heating or cooling system has been operating for the
current day.
❑ Press a second time to display the system operating time for the previous day (midnight to midnight).
❑ Press a third time to display the system operating time since the last time the usage function was cleared.
NOTE: Press for three seconds to clear the usage function.
STEP 12. SET THE FAN AND SYSTEM SWITCHES
First set the fan switch. 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.
Then set the system
switch.
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.
Usage
Usage
Usage
Usage
Fan
On Auto
Fan
On Auto
System
Heat Off Cool
System
Heat Off Cool
System
Heat Off Cool