STEP #3
INSTALL BACKPLATE & WIRE
Page 4
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.
* C may not be used on all systems.
** O/B is used if your system is a Heat Pump.
Remove the backplate connector from the
rear of the thermostat. Install wires as directed
below. When finished, snap thermostat on to
backplate.
Wire from the
old thermostat
terminal marked
Function
Install on the
new thermostat
connector marked
G or F
Fan
G
Y1, Y or C
Cooling
Y1
W1, W or H
Heating
W1,O,B
W1,O,B**
Power
Rh, R, M, Vr, A
R
C
O/B
C *
Common
Rev. Valve
Y2
Y2
W2
W2
2nd Stage Cool
2nd Stage Heat
RS+5
Remote 5vdc
RS
Remote Sensor Signal
RS G
Remote Sensor Ground
CK1
CK2
Dry Contact Switch 1
Dry Contact Switch 2
