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.
Wire from the
old thermostat
terminal marked
Function
I n s t a l l o n t h e
new thermos tat
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
STEP #4
WIRE CONNECTIONS
Y2
W2
2nd Stage Cool
2nd Stage Heat
Y2
W2
Page 6
HEAT
COOL
FAN
POWER
