White Rodgers 7904 Installation And Operation Instructions Manual page 3

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
B O Y Y 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
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
Hot
24 VAC
120 VAC
Neutral
TRANSFORMER
THERMOSTAT
W RC RH
SYSTEM
Hot
24 VAC
120 VAC
Neutral
Y
B O
NOTE
Cooling
RED jumper wire (provided
System
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
Y
B O G
Cooling Fan
System Relay
Figure 8. Typical wiring diagram for
heat/cool, 5-wire, two-transformer systems
JUMPER
WIRE
Y
B O
Reversing Compressor
Valve* Contactor
* Reversing valve is energized when the
system switch is in the COOL position
Figure 9. Typical wiring diagram for
heat pump with cool active reversing valve
JUMPER
WIRE
B O Y
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
JUMPER
WIRE
THERMOSTAT
G W RC RH
SYSTEM
Fan Heating
Relay System
24 VAC
TRANSFORMER
THERMOSTAT
W RC RH
SYSTEM
Hot
Heating
24 VAC
120 VAC
System
Neutral
HEATING TRANSFORMER
Hot
24 VAC
120 VAC
Neutral
COOLING TRANSFORMER
JUMPER
WIRE
THERMOSTAT
G W RC RH
SYSTEM
Fan
Hot
Relay
24 VAC 120 VAC
Neutral
TRANSFORMER
JUMPER
WIRE
THERMOSTAT
G W RC RH
SYSTEM
Fan
Hot
Relay
24 VAC
120 VAC
Neutral
TRANSFORMER
Hot
120 VAC
Neutral