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110-1060.qxd
3/27/03
All manuals and user guides at all-guides.com
Wiring Diagrams
The following is just a sample of the most common types of HVAC sys-
tems. Refer to your systems installation manual for wiring information.
HEAT/COOL
4-WIRE
SINGLE TRANSFORMER
Factory-Installed
Jumper
RH
Transformer
RC
Hot
120 VAC
24 VAC
Heating
W
Control
Cooling
Y
Control
B
O
Fan
G
Control
HEAT ONLY
2-WIRE
SINGLE TRANSFORMER
RH
Transformer
Hot
RC
120 VAC
24 VAC
Heating
W
Control
Y
B
O
G
TWO TRANSFORMER
(HEATING)
Transformer
Hot
120 VAC
24 VAC
Hot
120 VAC
24 VAC
(COOLING)
Transformer
10:52 AM
Page 11
HEAT ONLY
3-WIRE
SINGLE TRANSFORMER
T
Transformer
H
Hot
E
120 VAC
24 VAC
R
Heating
Control
M
O
S
T
A
T
Control
COOL ONLY
3-WIRE
SINGLE TRANSFORMER
NOTE: Cut center of
factory installed jumper
T
and bend back.
Transformer
H
Hot
E
120 VAC
24 VAC
R
M
O
Cooling
S
Control
T
A
T
Control
HEAT/COOL
5-WIRE
NOTE: Cut center of
factory installed jumper
and bend back.
RH
T
H
RC
NOTE: Both transformers
E
must be in phase.
R
Heating
W
Control
M
O
Cooling
Y
Control
S
T
B
A
O
T
Fan
G
Relay
11
(Black plate)
Factory-Installed
Jumper
RH
T
H
RC
E
R
W
M
O
Y
S
T
B
A
O
T
Fan
G
RH
T
NOTE:
H
Cut center
RC
of factory
E
installed
R
jumper
W
and bend
M
back.
O
Y
S
T
B
A
O
T
Fan
G
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