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 Fan
Y1, Y or C Cooling
W1, W or H Heating
Rh, R, M, Vr, A Power
C Common
O/B Rev. Valve
W2 2nd Stage Heat
Y2 2nd Stage Cool
RS+5 Remote Sensor +Svdc
RS Remote Sensor Signal
RS G Remote Sensor Groun¢
CK1 I D_Cc_tactSw_tch1
CK2 I D_, Con_ct Swit_ 2
Install on the
Function new thermostat
connector marked
G
Y1
Wl ,O,B
R
C*
Wl ,O,B**
W2
* C may not be used on all systems.
** O/B is used if your system is a Heat Pump.
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