Sample Wiring Diagrams
Page 7
R
C
G
Y1
Y2
W1
W2
O
E
L
R
C
G
Y1
Y2
W1
W2
O
24 vac common
24 vac return
fan relay
1st Stage compressor
reversing valve
No auxiliary heat, residential Heat Pumps ,
split systems & package units
5 Wire, 1 Stage Cooling, 1 Stage Heat - Heat Pump*
Thermostat
R
C
G
Y1
Y2
W1
W2
O
E
L
R
C
G
Y1
Y2
W1
W2
O
24 vac common
24 vac return
fan relay
1st Stage compressor
2nd Stagecompressor
1st stage heat circuit
2nd stage heat circuit
7 Wire, 2 Stage Cooling, 2 Stage Heat, Heat Pump
Most residential split and package heat pumps
with auxiliary heat
Thermostat
