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
♦ Wiring Diagrams
110-1086B.qxd 3/8/05 10:26 AM Page 5