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5
Hot
Heating
Control
Fan
Control
Cooling
Control
(COOLING)
Transformer
(HEATING)
Transformer
Transformer
T
H
E
R
M
O
S
T
A
T
T
H
E
R
M
O
S
T
A
T
RH
RC
W
Y
G
T
H
E
R
M
O
S
T
A
T
RH
RC
W
Y
G
C C
24 VAC
120 VAC
Hot
Heating
Control
Fan
Control
Transformer
24 VAC
120 VAC
T
H
E
R
M
O
S
T
A
T
RH
RC
W
Y
G
C
C
RH
RC
W
Y
G
C
Hot
Heating
Control
Heating
Control
Transformer
24 VAC
24 VAC
24 VAC
120 VAC
Hot
120 VAC
Hot
120 VAC
HEAT
/
COOL
4-WIRE
SINGLE TRANSFORMER
HEAT ONLY
2-WIRE
SINGLE TRANSFORMER
HEAT ONLY
3-WIRE
SINGLE TRANSFORMER
Factory-Installed
jumper
Factory- Installed
jumper
T
H
E
R
M
O
S
T
A
T
RH
RC
W
Y
G
Hot
Cooling
Control
Fan
Control
Transformer
24 VAC
120 VAC
COOL ONLY
3-WIRE
SINGLE TRANSFORMER
HEAT
/
COOL
5-WIRE
TWO TRANSFORMER
NOTE: Both transformers
must be in phase.
Cooling
Control
Fan
Control
NOTE: Cut center of
factory installed jumper
and bend back
NOTE: Cut center of factory installed
jumper and bend back.
W
G
Hot
Fan
Relay
Transformer
24 VAC
120 VAC
HEAT PUMP WITH
HEAT ACTIVE
REVERSING VALVE
T
H
E
R
M
O
S
T
A
T
RH
RC
Y
O
B
C
Pre-Installed jumper
Compressor
Contactor
Reversing
Valve
Hot
Fan
Relay
Transformer
24 VAC
120 VAC
HEAT PUMP WITH
COOL ACTIVE
REVERSING VALVE
T
H
E
R
M
O
S
T
A
T
RH
RC
W
G
Y
O
B
C
Pre-Installed jumper
Compressor
Contactor
Reversing
Valve
◆ Wiring Diagrams
NOTE: Installer must place jumper between
W and Y terminals.
NOTE: Installer must place jumper between
W and Y terminals.