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4
RH
Y
MV
24 VAC
120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
G W
Figure 7. Typical wiring diagram for heat/cool, 4-wire, single transformer systems
TRANSFORMER
6
Cooling
System
Fan
Relay
Heating
System
RC
JUMPER
WIRE
G
RC
6
MV
Y
W
RH
Thermostat Terminal Connections
G
From 24 VAC
transformer
From fan relay
From cooling system
Y
CONNECT red jumper
wire (provided)
W
RH
From heating system
NOTE
RED jumper wire (pro-
vided with thermostat)
must be connected be-
tween thermostat's RH
and RC terminals for pro-
per thermostat operation
with this system.
RC
Y
MV
24 VAC
120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
G W
Figure 6. Typical wiring diagram for cool only, 3-wire, single transformer systems
6
Fan
Relay
Cooling
System
RH
TRANSFORMER
G
RC
6
MV
Y
W
RH
Thermostat Terminal Connections
G
From 24 VAC
transformer
From fan relay
From cooling system
RC
Y
RH
Y
MV
24 VAC
120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
G W
Figure 5. Typical wiring diagram for heat only, 3-wire, single transformer systems
TRANSFORMER
6 RC
Fan
Relay
Heating
System
JUMPER
WIRE
G
RC
6
MV
Y
W
RH
W
RH
Thermostat Terminal Connections
G
From heating system
From 24 VAC
transformer
From fan relay
CONNECT red jumper
wire (provided)
NOTE
RED jumper wire (pro-
vided with thermostat)
must be connected be-
tween thermostat's RH
and RC terminals for pro-
per thermostat operation
with this system.
CAUTION
!
All wiring diagrams are for typical systems only. Refer to
equipment manufacturers’ instructions for specific sys-
tem wiring information.
To prevent electrical shock and/or equipment
damage, disconnect electrical power at the main
fuse box or circuit breaker until installation is
complete.
NOTE
RH
Y
MV
24 VAC
120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
G W
Figure 4. Typical wiring diagram for heat only, 2-wire, single transformer systems
TRANSFORMER
6
Heating
System
RC
G
RC
6
MV
Y
W
RH
W
RH
Thermostat Terminal Connections
From heating system
From 24 VAC transformer