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Wiring Diagrams
The following is just a sample of the most common types of HVAC
systems. Refer to your system’s installation manual for wiring information.
5
Hot
Heating
Control
Fan
Control
Cooling
Control
Transformer
T
H
E
R
M
O
S
T
A
T
RH
RC
W1
Y1
G
O
B
24 VAC
120 VAC
Hot
Heating
Control
Fan
Control
Transformer
24 VAC
120 VAC
Hot
Heating
Control
Transformer
24 VAC
120 VAC
HEAT/COOL
4-WIRE
SINGLE TRANSFORMER
HEAT ONLY
2-WIRE
SINGLE TRANSFORMER
HEAT ONLY
SINGLE TRANSFORMER
3-WIRE
Factory-Installed
Jumper
Hot
Cooling
Control
Fan
Control
Transformer
24 VAC
120 VAC
COOL ONLY
3-WIRE
SINGLE TRANSFORMER
RH
RC
W1
Y1
G
Factory-Installed
Jumper
RH
RC
W1
Y1
G
RH
RC
W1
Y1
G
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: Remove factory
installed jumper
O
B
O
B
O
B
110-1097B 3/8/05 10:39 AM Page 5