Emerson White-Rodgers 1F75H-21NP - Wiring

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)