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C ‡
Y
B
O
G
Fan
Relay
NOTE
For 2-wire Heat only,
attach to RH and W
Figure 2. Typical wiring diagram for
heat only, 3-wire, single transformer systems
C ‡
B
O
Y
Cooling
System
Relay
Figure 3. Typical wiring diagram for
cool only, 3-wire, single transformer systems
NOTE
RED jumper wire (provided with thermostat) must be
connected between thermostat RH and RC terminals
for proper thermostat operation with this system.
C ‡
Y
B
O
Cooling
Fan
System
Relay
Figure 4. Typical wiring diagram for
heat/cool, 4-wire, single transformer systems
‡
The 24 Volt neutral connection to terminal C on the thermostat is not required if the batteries are replaced once a
year with fresh premium brand alkaline batteries.
Heating System
1. Move SYSTEM switch to HEAT position.If the heating system
has a standing pilot, be sure to light it.
2. Press
to adjust thermostat setting above room tempera-
ture. The heating system should begin to operate.
3. Press
to adjust temperature setting below room tem-
perature. The heating system should stop operating.
JUMPER
WIRE
THERMOSTAT
W
RC
RH
SYSTEM
Heating
System
24 VAC
TRANSFORMER
JUMPER
WIRE
THERMOSTAT
G
W
RC
RH
SYSTEM
Fan
Hot
24 VAC
120 VAC
Neutral
TRANSFORMER
JUMPER
WIRE
THERMOSTAT
G
W
RC
RH
SYSTEM
Heating
System
Hot
24 VAC
120 VAC
Neutral
TRANSFORMER
C ‡
B
O
Cooling
System
Hot
120 VAC
Neutral
Figure 5. Typical wiring diagram for
heat/cool, 5-wire, two-transformer systems
C ‡
B
O
Reversing
Valve*
* Reversing valve is energized when the
system switch is in the COOL position
Figure 6. Typical wiring diagram for heat pump
with reversing valve energized in COOL
C ‡
B
O
Reversing
Compressor
Valve*
* Reversing valve is energized when the
system switch is in the HEAT position
Figure 7. Typical wiring diagram for heat pump
with reversing valve energized in HEAT
To prevent compressor and/or property damage, if the
outdoor temperature is below 50°F, DO NOT operate
the cooling system.
1. Move SYSTEM switch to COOL position.
2. Press
to adjust thermostat setting below room tempera-
ture.The blower should come on immediately on high speed,
followed by cold air circulation.
3. Press
to adjust temperature setting above room tem-
perature. The cooling system should stop operating.
3
Y
G
W
RC
RH
Fan
Heating
24 VAC
Relay
System
TRANSFORMER
24 VAC
COOLING TRANSFORMER
JUMPER
JUMPER
WIRE
WIRE
Y
G
W
RC
RH
Compressor
Fan
Relay
Contactor
24 VAC
TRANSFORMER
JUMPER
JUMPER
WIRE
WIRE
THERMOSTAT
Y
G
W
RC
RH
Fan
Contactor
Relay
24 VAC
TRANSFORMER
Cooling System
CAUTION
!
WIRING
THERMOSTAT
SYSTEM
Hot
120 VAC
Neutral
HEATING
Hot
120 VAC
Neutral
THERMOSTAT
SYSTEM
Hot
120 VAC
Neutral
SYSTEM
Hot
120 VAC
Neutral
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