Robertshaw 8425 User Manual page 6

110-1090.qxd 7/22/04
HEAT PUMP WIRING DIAGRAMS
HEAT PUMP WITH
COOL ACTIVE
REVERSING VALVE
Transformer
Hot
120 VAC 24 VAC
Compressor
Contactor
Fan
Relay
Reversing
Valve
NOTE: When switched to HP mode,
W1 is connected internally to Y1.
HEAT PUMP + AUX COOL
COOL ACTIVE
REVERSING VALVE
Transformer
Hot
24 VAC
120 VAC
Compressor
Fault Output
(24VAC)
Compressor
Contactor
Reversing
Valve
Fan
Control
Second
Stage Cool
Aux/Emer
Heat
NOTE: When switched to HP mode,
W1 is connected internally to Y1.
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HEAT PUMP WITH
HEAT ACTIVE
REVERSING VALVE
R
T
Transformer
H
C
Hot
E
120 VAC 24 VAC
W1 R
M
Y1
O
S
G
T
A
O
T
B
Y2
W2/E
NOTE: When switched to HP mode,
W1 is connected internally to Y1.
HEAT PUMP + AUX HEAT
HEAT ACTIVE
REVERSING VALVE
R
T
Transformer
H
Hot
C
E
24 VAC
120 VAC
R
L
M
Compressor
W1
O
Fault Output
(24VAC)
S
Y1
T
A
B
T
O
G
Y2
W2/E
NOTE: When switched to HP mode,
W1 is connected internally to Y1.
6
R
T
H
C
E
W1 R
Compressor
M
Y1
Contactor
O
Fan
S
G
Relay
T
O
A
Reversing
T
B
Valve
Y2
W2/E
R
T
H
C
E
R
L
M
W1
O
S
Compressor
Y1
Contactor
T
Reversing
A
B
Valve
T
O
Fan
G
Control
Second
Y2
Stage Cool
Aux/Emer
W2/E
Heat