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