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B
O
Y
G
W
Heating
System
Figure 3. Typical wiring diagram for heating only,
2-wire, single transformer systems or millivolt systems
Thermostat
NOTE
Jumper wire must be
added between R and B
terminals on the primary
R
W
control (jumper wire not
provided with thermostat).
Add jumper wire
(not provided with thermostat)
Figure 4. Typical wiring diagram for
3-wire SERIES 10 heating systems
Y
Y
B
O
G
NOTE
Fan
RED jumper wire (provided
Relay
with thermostat) must be
connected between thermo-
stat's RH and RC terminals
for proper thermostat oper-
ation with this system.
Figure 5. Typical wiring diagram for
heat only, 3-wire, single transformer systems
B
O
Y
G
Cooling
Fan
System
Relay
Figure 6. Typical wiring diagram for
cool only, 3-wire, single transformer systems
CHECK THERMOSTAT OPERATION
If at any time during testing your system does not operate
properly, contact a qualified serviceperson.
Fan Operation
If your system does not have a G terminal connection, skip to
Heating System.
1. Turn on power to the system.
2. Move fan switch to ON position. The blower should begin to
operate.
THERMOSTAT
RC
RH
SYSTEM
24 VAC Transformer
or
Thermopile
3-wire Series 10
Primary Control
(located at furnace)
B
W
R
Furnace
JUMPER
WIRE
THERMOSTAT
W
RC
RH
SYSTEM
Heating
System
24 VAC
TRANSFORMER
THERMOSTAT
W
RC
RH
SYSTEM
Hot
24 VAC
120 VAC
Neutral
TRANSFORMER
B
O
NOTE
RED jumper wire (provided
with thermostat) must be
connected between thermo-
stat's RH and RC terminals
for proper thermostat oper-
ation with this system.
Figure 7. Typical wiring diagram for
heat/cool, 4-wire, single transformer systems
B
O
Y
Cooling
System
Figure 8. Typical wiring diagram for
heat/cool, 5-wire, two-transformer systems
B
O
Reversing
Compressor
Hot
Valve*
120 VAC
* Reversing valve is energized when the
Neutral
system switch is in the COOL position
Figure 9. Typical wiring diagram for
heat pump with cool active reversing valve
Y
B
O
Reversing
Compressor
Valve*
Contactor
* Reversing valve is energized when the
system switch is in the HEAT position
Figure 10. Typical wiring diagram for
heat pump with heat active reversing valve
3. Move fan switch to AUTO position. The blower should stop
immediately.
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 tempera-
ture. The heating system should stop operating.
3
JUMPER
WIRE
Y
G
W
RC
RH
Cooling
Fan
Heating
System
Relay
System
24 VAC
THERMOSTAT
G
W
RC
RH
Fan
Heating
24 VAC
Relay
System
HEATING TRANSFORMER
24 VAC
COOLING TRANSFORMER
JUMPER
JUMPER
WIRE
WIRE
Y
G
W
RC
RH
Fan
Contactor
Relay
24 VAC
TRANSFORMER
JUMPER
JUMPER
WIRE
WIRE
THERMOSTAT
G
W
RC
RH
SYSTEM
Fan
Relay
24 VAC
TRANSFORMER
Heating System
THERMOSTAT
SYSTEM
Hot
120 VAC
Neutral
TRANSFORMER
SYSTEM
Hot
120 VAC
Neutral
Hot
120 VAC
Neutral
THERMOSTAT
SYSTEM
Hot
120 VAC
Neutral
Hot
120 VAC
Neutral
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