If the terminal designations on your old
thermostat do not match those on the
new thermostat, refer to the chart below,
or the wiring diagrams that follow.
Wire from the
old thermostat
terminal marked
GorF
Y1,YorC
W1,Wor H
Rh, R, M, Mr, A
C
O/B
Y2
W2
RS+5
RS
RS G
CK1
CK2
Function
Fan
Cooling
Heating
Power
Common
Rev. Valve
2nd Stage Cool
2nd Stage Heat
RemoteSensor*5vdc
RemoteSensor Signal
RemoteSensor Grmmd
DryContactSwitch1
DryContact Switch 2
* C may not be used on all systems.
Install on the
new thermostat
connector marked
G
Y1
Wl ,O,B
R
C*
Wl ,O,B**
Y2
W2
RS+5
RS
GND
** O/B is used if your system is a Heat Pump.
Page 4
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