Wiring Diagrams - Robertshaw C8601 User Manual

110-1103B.qxd 3/14/05

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.
HEAT/COOL
4-WIRE
SINGLE TRANSFORMER
Transformer
Hot
120 VAC 24 VAC
Heating
W1
Control
Cooling
Y1
Control
Fan
G
Control
O
B
HEAT ONLY
2-WIRE
SINGLE TRANSFORMER
Transformer
Hot
120 VAC 24 VAC
Heating
W1
Control
HEAT PUMP WITH
COOL ACTIVE
REVERSING VALVE
Transformer
Hot
120 VAC 24 VAC
Compressor
Contactor
Fan
Relay
Reversing
Valve
NOTE: Make sure the HP switch is in the HP position.
When switched to HP mode,
W1 is connected internally to Y1.
2:31 PM Page 5
HEAT ONLY
3-WIRE
SINGLE TRANSFORMER
T
R
Transformer
H
Hot
C
E
120 VAC 24 VAC
R
M
O
S
T
A
T
COOL ONLY
3-WIRE
SINGLE TRANSFORMER
R
Transformer
T
C
Hot
H
24 VAC
120 VAC
E
R
M
Y1
O
S
G
T
O
A
T
B
HEAT PUMP WITH
HEAT ACTIVE
REVERSING VALVE
R
T
Transformer
H
C
Hot
E
120 VAC 24 VAC
W1
R
M
Y1
O
S
G
T
A
O
T
B
NOTE: Make sure the HP switch is in the HP position.
When switched to HP mode,
W1 is connected internally to Y1.
5
R
T
H
C
E
R
Heating
W1
Control
M
O
Y1
S
T
Fan
G
Control A
T
O
B
R
T
C
H
E
W1
R
Cooling
M
Y1
Control
O
S
Fan
G
Control
T
O
A
T
B
R
T
H
C
E
W1
R
Compressor
M
Y1
Contactor
O
Fan
S
G
Relay
T
A
O
T
Reversing
B
Valve