White-Rodgers 70 Series Thermostat Line Extension
34
Wiring
Tables shown describe the thermostat terminal functions.
Conventional Thermostats (1F75C Models)
Terminal
Designations Terminal Function
RC*
Power for Cooling
RH*
Power for Heating
O/B
Changeover Terminal-Energized
in Heat (B) or Cool (O) for Heat
Pump or Damper Systems
Y**
Cool Relay
G
Fan Relay
W**
Heat Relay
C
Common wire for 24V (optional
with batteries)
Heat Pump Thermostats (1F75H Models)
Terminal
Designations Terminal Function
R
Power for Heating and Cooling
O/B
Changeover Terminal-Energized in
Heat (B) or Cool (O) for Heat Pump
or Damper Systems
Y
Heat and Cool Mode 1st Stage
Compressor
G
Fan Relay
E*
Auxiliary only Heat Mode
(Emergency Heat)
C
Common wire for 24V (optional with
batteries)
W2
Heat Mode – 2nd stage (Auxiliary)
