6
Hot
Cooling
Control
Fan
Control
Transformer
24 VAC
120 VAC
COOL ONLY
3-WIRE
SINGLE TRANSFORMER
W1
Y1
G
T
H
E
R
M
O
S
T
A
T
O
B
C
R
Hot
Compressor
Contactor
Transformer
24 VAC
120 VAC
HEAT PUMP WITH
COOL ACTIVE
REVERSING VALVE
W1
Y1
B
G
O
T
H
E
R
M
O
S
T
A
T
NOTE: Make sure the HP switch is in the HP
position. When switched to HP mode,
W1 is connected internally to Y1.
Reversing
Valve
Fan
Relay
C
R
Hot
Transformer
24 VAC
120 VAC
HEAT PUMP WITH
HEAT ACTIVE
REVERSING VALVE
W1
T
H
E
R
M
O
S
T
A
T
NOTE: Make sure the HP switch is in the HP
position. When switched to HP mode,
W1 is connected internally to Y1.
Compressor
Contactor
Y1
G
O
B
Reversing
Valve
Fan
Relay
C
R
♦
Wiring Diagrams
(continued)
110-1087B.qxd 3/4/05 4:00 PM Page 6
