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Heating
Control
(COOLING)
Transformer
(HEATING)
Transformer
Hot
120 VAC 24 VAC
24 VAC
Hot
120 VAC
Cooling
Control
HEAT/COOL
5-WIRE
TWO TRANSFORMER
NOTE: Disconnect
factory installed jumper.
Hot
Compressor
Contactor
Transformer
24 VAC
120 VAC
HEAT PUMP WITH
COOL ACTIVE
REVERSING VALVE
RH
RC
W1
Y1
B
G
O
RC
RH
W1
Y1
G
CAUTION: Both transformers
must be in phase or damage
may result.
to the equipment and thermostat
Hot
Transformer
24 VAC
120 VAC
HEAT PUMP WITH
HEAT ACTIVE
REVERSING VALVE
RH
RC
W1
NOTE: Factory
Installed Jumper
NOTE: Factory
Installed Jumper
T
H
E
R
M
O
S
T
A
T
T
H
E
R
M
O
S
T
A
T
T
H
E
R
M
O
S
T
A
T
NOTE: Make sure the HP switch
is in the HP position.
NOTE: Make sure the HP switch
is in the HP position
When switched to HP mode,
When switched to HP mode,
W1 is connected internally to Y1.
W1 is connected internally to Y1.
O
B
Fan
Relay
Reversing
Valve
Fan
Relay
Compressor
Contactor
Y1
G
O
B
Reversing
Valve
Fan
Relay
Wiring Diagrams
110-1097B 3/8/05 10:39 AM Page 6