York LX series Owner's Manual page 21

Installation Instructions
Sample Wiring Diagrams
Heat Pump Systems with Dual Fuel
7 Wire, 2 Stage Cooling, 3 Stage Heat
Residential & Commercial Heat Pump with
'O' Reversing Valve and Fossil Fuel furnace.
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
Humidification or Dehumidification
Humidification
System
Dehumidification Terminal
on Equipment
DEHUM/
HUM
Dry Contact and Aux Output
R
G
AUX
OUTDOOR
W1/O/B
SENSOR
W2
Y1
REMOTE
Y2
SENSOR
W3
DRY
HUM CONTACT
FAULT
DEHUM
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)
R
G
OUTDOOR
W1/O/B
SENSOR
W2
Y1
REMOTE
Y2
SENSOR
W3
HUM
CONTACT
DEHUM
Sprinkler System
C
Page 13
C
AUX
DRY
FAULT
12
11 1
10 2
9 3
8 4
7 5
6
Time Clock