Terminal Designations
Conventional
Heat Pump
R
24 VAC Power for Heat
Rc 24 VAC Power for Cool
C
Common 24 VAC
Y
Cool Control – stage 1
W
Heat Control – stage 1
G
Fan Control
W2 Heat Control – stage 2
Y2 Cool Control – stage 2
Hu Humidify
Dh Dehumidify
D
Data (Not Used)
R
24 VAC Power for Heat
Rc
Jumper to Terminal “R”
C
Common 24 VAC
Y
Compressor – stage 1
O/B (W) Reversing Valve
G
Fan Control
Aux (W2) Auxiliary/Emergency Heat
Y2
Compressor – stage 2
Hu
Humidify
Dh
Dehumidify
D
Data (Not Used)
Note:
Remove jumper between R & Rc for two Transformer systems.
Standard Wire Colors
Most thermostat installations follow standard wire color designations. This should be
verified for your installation. These standard colors are:
Terminal
Color
Description
R, Rc
Red
24 VAC Power
W
White
Heat Control
G
Green
Fan Control
Y
Yellow
Cool Control
C
Black
24 VAC Common
Y
2
Blue or Orange Cool Control - Stage 2
W
2
Varies
Heat Control – Stage 2
Aux
Varies, blue,
pink, gray, tan
Auxiliary or Emergency
Heat
O/B
Varies, Orange Reversing Valve
Hu
Varies
Humidify Control
Dh
Varies
Dehumidify Control
2
