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Installation Instructions
Sample Wiring Diagrams
Heat Pump Systems
5 Wire, 1 Stage Cooling, 1 Stage Heat
Residential & Commercial Heat Pump with
'O' Reversing Valve
R
24VAC Power
C
24VAC Common
W1/O/B Reversing Valve
Y1
1st Stage Compressor
(Cool or Heat)
G
Fan
GAS/EL
O
GAS
7 Wire, 2 Stage Cooling, 3 Stage Heat
Residential & Commercial Heat Pump with
'O' Reversing Valve.
R
24VAC Power
C
24VAC Common
W1/O/B
Reversing Valve
W2
3rd Stage Heat
Y1
1st Stage Compressor
(Cool or Heat)
Y2
2nd Stage Compressor
(Cool or Heat)
G
Fan
GAS/EL
O
GAS
(Number of Compressor Stages set to 2)
with Dip Switch Positions
HP
B
ELEC
HP
B
ELEC
82
6 Wire, 1 Stage Cooling, 2 Stage Heat
Residential & Commercial Heat Pump with
'O' Reversing Valve
R
24VAC Power
C
24VAC Common
W1/O/B Reversing Valve
Y1
1st Stage Compressor
(Cool or Heat)
W2
Aux Heat
G
Fan
GAS/EL
HP
O
B
GAS
ELEC
8 Wire, 2 Stage Cooling, 4 Stage Heat
Residential & Commercial Heat Pump with
'O' Reversing Valve.
R
24VAC Power
C
24VAC Common
W1/O/B Reversing Valve
W2
3rd Stage Heat
W3
4th Stage Heat
Y1
1st Stage Compressor
(Cool or Heat)
Y2
2nd Stage Compressor
(Cool or Heat)
G
Fan
GAS/EL
HP
O
B
GAS
ELEC
(Number of Compressor Stages set to 2)
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