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Cooling
System
Typical wiring diagram for cool only,
3-wire, single transformer systems
Typical wiring diagram for cool only,
C ‡
B
O
Y
C ‡
B
O
Y
3-wire, single transformer systems
Cooling
Cooling
System
System
Typical wiring diagram for cool only,
Typical wiring diagram for cool only,
3-wire, single transformer systems
3-wire, single transformer systems
NOTE
RED jumper wire (provided with thermostat) must be
connected between thermostat RH and RC terminals
NOTE
for proper thermostat operation with this system.
RED jumper wire (provided with thermostat) must be
connected between thermostat RH and RC terminals
C ‡
Y
B
O
G
for proper thermostat operation with this system.
C ‡
Y
B
O
Cooling
Fan
System
Relay
Cooling
Fan
System
Relay
NOTE
NOTE
RED jumper wire (provided with thermostat) must be
RED jumper wire (provided with thermostat) must be
connected between thermostat RH and RC terminals
connected between thermostat RH and RC terminals
for proper thermostat operation with this system.
Typical wiring diagram for heat/cool,
for proper thermostat operation with this system.
C ‡
4-wire, single transformer systems
Y
B
O
C ‡
B
O
Y
Typical wiring diagram for heat/cool,
4-wire, single transformer systems
Cooling
Cooling
System
Relay
System
Relay
Fan
24 VAC
120 VAC
Relay
Neutral
TRANSFORMER
24 VAC
JUMPER
TRANSFORMER
JUMPER
WIRE
WIRE
THERMOSTAT
THERMOSTAT
G
W
RC
RH
G
W
RC
RH
SYSTEM
SYSTEM
Fan
Fan
Relay
Relay
24 VAC
24 VAC
TRANSFORMER
TRANSFORMER
JUMPER
WIRE
THERMOSTAT
JUMPER
W
RC
RH
WIRE
SYSTEM
THERMOSTAT
G
W
RC
RH
Heating
SYSTEM
System
Hot
Heating
24 VAC
120 VAC
System
Neutral
24 VAC
TRANSFORMER
JUMPER
JUMPER
WIRE
WIRE
THERMOSTAT
TRANSFORMER
THERMOSTAT
G
W
RC
RH
G
W
RC
RH
SYSTEM
SYSTEM
Fan
Heating
Fan
Heating
System
Hot
System
24 VAC
Reversing
Hot
* Reversing valve is energized when the
system switch is in the COOL position
120 VAC
Neutral
* Reversing valve is energized when the
system switch is in the COOL position
C ‡
B
C ‡
B
Reversing
Reversing
Hot
Hot
120 VAC
120 VAC
Neutral
* Reversing valve is energized when the
Neutral
* Reversing valve is energized when the
system switch is in the COOL position
system switch is in the COOL position
C ‡
C ‡
Reversing
Valve*
Reversing
Hot
* Reversing valve is energized when the
system switch is in the HEAT position
120 VAC
* Reversing valve is energized when the
Neutral
system switch is in the HEAT position
with reversing valve energized in HEAT
C ‡
C ‡
ǂ c-wire not required
Reversing
Reversing
Hot
120 VAC
Compressor
Fan
Valve*
Contactor
Relay
Typical wiring diagram for heat pump
JUMPER
JUMPER
with reversing valve energized in COOL
WIRE
WIRE
Typical wiring diagram for heat pump
O
Y
G
W
O
Y
G
W
with reversing valve energized in COOL
Compressor
Fan
Compressor
Fan
Valve*
Contactor
Relay
Valve*
Contactor
Relay
Typical wiring diagram for heat pump
Typical wiring diagram for heat pump
with reversing valve energized in COOL
with reversing valve energized in COOL
JUMPER
WIRE
JUMPER
B
Y
O
G
W
WIRE
B
Compressor
Y
Fan
O
G
W
Contactor
Relay
Compressor
Fan
Valve*
Contactor
Relay
Typical wiring diagram for heat pump
JUMPER
JUMPER
WIRE
WIRE
Typical wiring diagram for heat pump
B
Y
O
G
W
B
O
Y
G
W
with reversing valve energized in HEAT
Compressor
Fan
Compressor
Fan
Valve*
Contactor
Relay
Valve*
Contactor
Relay
24 VAC
120 VAC
Hot
Neutral
24 VAC
TRANSFORMER
120 VAC
Neutral
JUMPER
TRANSFORMER
JUMPER
WIRE
WIRE
THERMOSTAT
THERMOSTAT
RC
RH
RC
RH
SYSTEM
SYSTEM
Hot
Hot
24 VAC
120 VAC
24 VAC
120 VAC
Neutral
Neutral
TRANSFORMER
TRANSFORMER
JUMPER
WIRE
THERMOSTAT
JUMPER
RC
RH
WIRE
SYSTEM
THERMOSTAT
RC
RH
SYSTEM
Hot
24 VAC
120 VAC
Hot
Neutral
TRANSFORMER
24 VAC
120 VAC
Neutral
JUMPER
JUMPER
WIRE
TRANSFORMER
WIRE
THERMOSTAT
THERMOSTAT
RC
RH
RC
RH
SYSTEM
SYSTEM
Hot
Hot
24 VAC
120 VAC
15
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