York LX series - Page 21

Residential & Commercial Heat Pump with
‘O’ Reversing Valve and Fossil Fuel furnace.
7 Wire, 2 Stage Cooling, 3 Stage Heat
R 24VAC Power
C 24VAC Common
W1/O/B Reversing Valve
W2 3rd Stage Heat
(connected to furnace)
Y1 1st Stage Compressor
(Cool or Heat)
Y2 2nd Stage Compressor
(Cool or Heat)
G Fan
Page 13
Installation Instructions
Sample Wiring Diagrams
Heat Pump Systems with Dual Fuel
J1 = Heat Pump
J2 = O
J3 = GAS
Setup Step 24 is set to 2
(Number of Compressor Stages)
Setup Step 46 is set to ON.
(Dual Fuel On, Off, or External)
Humidification or Dehumidification
G
Y1
Y2
W3
R
W1/O/B
W2
HUM
DEHUM
C
AUX
REMOTE
SENSOR
FAULT
DRY
CONTACT
OUTDOOR
SENSOR
Humidification
System
DEHUM/
HUM
Dehumidification Terminal
on Equipment
Dry Contact and Aux Output
G
Y1
Y2
W3
R
W1/O/B
W2
HUM
DEHUM
C
AUX
REMOTE
SENSOR
FAULT
DRY
CONTACT
OUTDOOR
SENSOR
12
11
10
9
8
7
6
5
4
3
2
1
Time Clock
Sprinkler System