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Application Switches
Conventional Models
Gas / Elec Switch
This switch controls the main
blower sequence of operation
GAS – equipment operates fan on a
•
call for heat
-
Typically for fossil fuel furnaces
ELEC – thermostat operates the fan
•
on a call for heat
-
Typically for electric furnaces or
heat pumps
These switches are on the back of the thermostat and must be configured correctly for the application.
White-Rodgers 70 Series Thermostat Line Extension
Heat Pump
O / B Switch
This switch controls the position
of the reversing valve
"O" position – energizes reversing
•
valve in the cooling mode
"B" position – energizes the
•
reversing valve in the heating mode
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