Wiring Diagrams; Cool Only - Robertshaw 9500 User Manual

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
SINGLE TRANSFORMER
Transformer
Hot
24 VAC
120 VAC
SINGLE TRANSFORMER
Transformer
Hot
120 VAC 24 VAC
HEAT/COOL
TWO TRANSFORMER
(HEATING)
Transformer
Hot
24 VAC
120 VAC
Hot
120 VAC 24 VAC
(COOLING)
Transformer
HEAT PUMP WITH
REVERSING VALVE
Transformer
Hot
120 VAC
NOTE: Installer must place jumper
between "W" and "Y" terminals.
4-WIRE
Factory-Installed
jumper
T
RH
H
E
RC
R
Heating
M
W
Control
O
S
Cooling
Y
Control
T
A
Fan
G
T
Control
HEAT ONLY
2-WIRE
T
RH
H
E
RC
R
Heating
M
W
Control
O
S
Y
T
A
G
T
5-WIRE
T
RH
H
E
RC
R
Heating
M
W
Control
O
S
Cooling
Y
Control
T
A
Fan
G
T
Control
COOL ACTIVE
RH
T
H
RC
E
24 VAC
R
W
M
Fan
O
G
Relay
S
Compressor
T
Y
Contactor
A
Reversing
O T
Valve
B
SINGLE TRANSFORMER
Transformer
Hot
120 VAC
SINGLE TRANSFORMER
Transformer
Hot
120 VAC
NOTE: Cut center of
factory installed jumper
and bend back
NOTE: Both transformers
must be in phase.
Pre-Installed jumper
Transformer
Hot
120 VAC
NOTE: Installer must place jumper
between "W" and "Y" terminals.
10
HEAT ONLY
3-WIRE
Factory- Installed
jumper
T
RH
H
E
RC
R
24 VAC
Heating
M
W
Control
O
S
Y
T
A
Fan
G
T
Control

COOL ONLY

3-WIRE
NOTE: Remove factory
installed jumper
T
RH
H
E
RC
R
24 VAC
M
W
O
S
Cooling
Y
Control
T
A
Fan
G
T
Control
HEAT PUMP WITH
HEAT ACTIVE
REVERSING VALVE
RH
RC
24 VAC
W
Fan
G
Relay
Compressor
Y
Contactor
O
Reversing
B
Valve
Pre-Installed jumper
T
H
E
R
M
O
S
T
A
T