Venstar T7900 - Manual (Page 87)

79
Installation Instructions
Sample Wiring Diagrams
with Dip Switch Positions
Heat Pump Systems
Residential & Commercial Heat Pump with
‘O’ Reversing Valve
5 Wire, 1 Stage Cooling, 1 Stage Heat
R 24VAC Power
C 24VAC Common
W1/O/B Reversing Valve
Y1 1st Stage Compressor
(Cool or Heat)
G Fan
Residential & Commercial Heat Pump with
‘O’ Reversing Valve.
8 Wire, 2 Stage Cooling, 4 Stage Heat
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
Residential & Commercial Heat Pump with
‘O’ Reversing Valve
6 Wire, 1 Stage Cooling, 2 Stage Heat
R 24VAC Power
C 24VAC Common
W1/O/B Reversing Valve
Y1 1st Stage Compressor
(Cool or Heat)
W2 Aux Heat
G Fan
Residential & Commercial Heat Pump with
‘O’ Reversing Valve.
7 Wire, 2 Stage Cooling, 3 Stage Heat
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
(Number of Compressor Stages set to 2)
(Number of Compressor Stages set to 2)
GAS/EL
HP
O
GAS
B
ELEC
GAS/EL HP
O
GAS
B
ELEC
GAS/EL
HP
O
GAS
B
ELEC
GAS/EL
HP
O
GAS
B
ELEC
12
3
ON
12
3
ON
12
3
ON
12
3
ON