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STEP #3
Remove the backplate connector from the
rear of the thermostat. Install wires as directed
below. When finished, snap thermostat on to
backplate.
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
G or F
Y1, Y or C
W1, W or H
Rh, R, M, Vr, A
* C may not be used on all systems.
** O/B is used if your system is a Heat Pump.
INSTALL BACKPLATE & WIRE
C
O/B
Rev. Valve
2nd Stage Cool
Y2
2nd Stage Heat
W2
RS+5
Remote Sensor +5vdc
RS
Remote Sensor Signal
RS G
Remote Sensor Ground
CK1
Dry Contact Switch 1
CK2
Dry Contact Switch 2
Function
connector marked
Fan
Cooling
Heating
Power
Common
Page 13
Install on the
new thermostat
G
Y1
W1,O,B
R
C *
W1,O,B**
Y2
W2
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