10
Installation Instructions
Wire Connections
If the terminal designations on your old thermostat do not match those
on the new thermostat, see the chart below or the wiring diagrams
that follow.
Wire from the
Install on the
old thermostat
Function
new thermostat
terminal marked
connector marked
G or F
Fan
G
Y1, Y
Cooling
Y1
W1, W
Heating
W1/0/B
Rh, R, M, Vr, A
Power
R
C
Common
C
O/B
Rev. Valve
W1/O/B*
W2
2nd Stage Heat
W2
Y2
2nd Stage Cooling
Y2
W3
3rd Stage Heat
W3
H, Hum
Humidity
HUM
D, Dehum
Dehumidity
DEHUM
Ck1
Dry Contact Switch
DRY CONTACT
CKGND
Dry Contact Switch
DRY CONTACT
* O/B is used if your system is a Heat Pump.