Wire Connections - York LX series Owner's Manual

Installation Instructions

Wire Connections

Wire Connections
If the terminal designations on your old thermostat
YOUR NAME
I
Am
2:00 74
MO
C OO L S ET
78
Outdoor H EAT ET S
85 68
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
O/B
2nd Stage Heat
W2
2nd Stage Cooling
Y2
W3
3rd Stage Heat
H, HUM
D, DEHUM Dehumidity
Ck1 Dry Contact Switch
Dry Contact Switch
CKGND
* O/B is used if your system is a Heat Pump.
Install on the
new thermostat
Function
connector marked
Fan G
Cooling Y1
W1/O/B
Heating
Power R
Common
C
W1/O/B*
Rev. Valve
W2
Y2
W3
HUM
Humidity
DEHUM
DRY CONTACT
DRY CONTACT
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