Page 8
Wire Connections
* O/B is used if your system is a Heat Pump.
Installation Instructions
* O/B is used if your system is a Heat Pump.
Wire Connections
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
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
PowerRh, R, M, Vr, A R
C
O/B
C
Common
Rev. Valve
W2
2nd Stage Heat
Y2
CKGND
Dry Contact Switch
Y2
W3W3
Ck1
Dry Contact Switch
DRY CONTACT
DRY CONTACT
W1/O/B*
W2
2nd Stage Cooling
3rd Stage Heat
REMOTE/
OUTDOOR
REMOTE/
OUTDOOR
OUT -
OUT +
Remote/Outdoor
Sensor
Remote/Outdoor
Sensor
L, Fault FAULT
Fault Input
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