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C ‡
B
O
Y
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 ‡
Y
B
O
G
Cooling
Fan
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
G
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 "AA" 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 thermostat setting below room tempera-
ture. The heating system should stop operating.
JUMPER
WIRE
THERMOSTAT
W
RC
RH
SYSTEM
Heating
System
Hot
24 VAC
120 VAC
Neutral
TRANSFORMER
JUMPER
WIRE
THERMOSTAT
W
RC
RH
SYSTEM
Hot
24 VAC
120 VAC
Neutral
TRANSFORMER
JUMPER
WIRE
THERMOSTAT
W
RC
RH
SYSTEM
Heating
System
Hot
24 VAC
120 VAC
Neutral
TRANSFORMER
C ‡
B
O
Y
Cooling
System
Figure 5. Typical wiring diagram for
heat/cool, 5-wire, two-transformer systems
C ‡
Y
B
O
Reversing
Compressor
Valve*
Contactor
* 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
Y
Reversing
Compressor
Valve*
Contactor
* 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
Cooling System
!
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 thermostat setting above room tempera-
ture. The cooling system should stop operating.
3
THERMOSTAT
G
W
RC
RH
SYSTEM
Fan
Heating
24 VAC
Relay
System
HEATING
TRANSFORMER
24 VAC
COOLING TRANSFORMER
JUMPER
JUMPER
WIRE
WIRE
THERMOSTAT
G
W
RC
RH
SYSTEM
Fan
Relay
24 VAC
TRANSFORMER
JUMPER
JUMPER
WIRE
WIRE
THERMOSTAT
G
W
RC
RH
SYSTEM
Fan
Relay
24 VAC
TRANSFORMER
CAUTION
Hot
120 VAC
Neutral
Hot
120 VAC
Neutral
Hot
120 VAC
Neutral
Hot
120 VAC
Neutral
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