THERMOSTAT

B O Y G

W RC RH

SYSTEM

Heating

 

 

 

System

 

 

24 VAC Transformer

 

 

 

or

 

 

 

Thermopile

 

 

 

 

Figure 3. Typical wiring diagram for heating only,

2-wire, single transformer systems or millivolt systems

B O

NOTE

RED jumper wire (provided with thermostat) must be connected between thermo- stat'sRH and RC terminals for proper thermostat oper- ation with this system.

 

 

 

JUMPER

 

 

 

 

WIRE

 

Y

G

W

RC RH

THERMOSTAT

SYSTEM

 

 

 

 

Cooling

Fan

Heating

 

 

System

Relay

System

 

Hot

 

 

 

24 VAC

120 VAC

 

 

 

 

Neutral

 

 

 

TRANSFORMER

Figure 7. Typical wiring diagram for

heat/cool, 4-wire, single transformer systems

Thermostat

R W

 

NOTE

 

3-wire Series 10

Jumper wire must be

Primary Control

added between R and B

(located at furnace)

terminals on the

primary

control (jumper

wire not

B

provided with thermostat).

 

 

 

 

W

 

R

 

Add jumper wire

Furnace

 

(not provided with thermostat)

 

THERMOSTAT

B O Y

G

W

RC RH

Cooling

Fan

Heating

System

Relay

System

 

 

 

 

SYSTEM

 

 

 

 

 

 

 

 

 

 

 

 

Hot

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24 VAC

 

 

 

 

 

 

 

120 VAC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Neutral

 

 

 

 

 

 

HEATING TRANSFORMER

24 VAC

 

 

 

 

 

 

 

Hot

 

 

 

 

 

 

 

 

 

 

 

 

 

 

120 VAC

 

 

 

 

 

 

 

 

 

 

 

Neutral

COOLING TRANSFORMER

Figure 4. Typical wiring diagram for 3-wire SERIES 10 heating systems

Figure 8. Typical wiring diagram for

heat/cool, 5-wire, two-transformer systems

B O Y

NOTE

RED jumper wire (provided with thermostat) must be connected between thermo- stat'sRH and RC terminals for proper thermostat oper- ation with this system.

JUMPER

WIRE

G

W

RC

RH

THERMOSTAT

SYSTEM

 

 

 

 

Fan

Heating

 

 

 

Relay

System

 

 

Hot

 

 

 

24 VAC

120 VAC

 

 

 

 

Neutral

 

 

 

TRANSFORMER

 

JUMPER

 

WIRE

B O

Y

G W

Reversing

Compressor

Fan

Valve*

Contactor

Relay

*Reversing valve is energized when the system switch is in the COOL position

JUMPER

WIRE

THERMOSTAT

RC RH

SYSTEM

Hot

 

 

 

 

 

 

 

24 VAC

 

 

 

 

120 VAC

 

 

 

 

 

 

 

Neutral

TRANSFORMER

Figure 5. Typical wiring diagram for

heat only, 3-wire, single transformer systems

B

O

Y

G W RC RH

THERMOSTAT

SYSTEM

 

 

 

 

 

 

Cooling

Fan

 

 

 

System

Relay

Hot

 

 

 

24 VAC

120 VAC

 

 

 

 

Neutral

Figure 6. Typical wiring diagram for

cool only, 3-wire, single transformer systems

Figure 9. Typical wiring diagram for

heat pump with cool active reversing valve

 

 

JUMPER

 

 

WIRE

B

O

Y

G W

Reversing

Compressor

Fan

Valve*

 

Contactor

Relay

*Reversing valve is energized when the system switch is in the HEAT position

JUMPER

WIRE

THERMOSTAT

RC RH

SYSTEM

 

Hot

24 VAC

120 VAC

Neutral

TRANSFORMER

Figure 10. Typical wiring diagram for

heat pump with heat active reversing valve

3

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White Rodgers 7904 specifications Thermostat Wire Series

7904 specifications

The White Rodgers 7904 is a versatile and efficient thermostat designed for residential heating and cooling systems. Recognized for its user-friendly interface, the 7904 offers a range of features that enhance comfort while providing energy savings. The device primarily incorporates programmable settings, allowing homeowners to customize their heating and cooling schedules based on their daily routines. With four distinct program periods per day, users can set different temperatures for mornings, days, evenings, and nights, helping to optimize energy usage.

One of the standout technologies in the White Rodgers 7904 is its adaptive intelligent recovery feature. This smart technology learns how long it takes to reach desired temperatures, adjusting the system's start-up time accordingly. This ensures that the home is at the preferred temperature right when residents arrive, without wasting energy by heating or cooling the home too early or too late.

Another important aspect of the 7904 is its compatibility with various HVAC systems, including gas, oil, and electric heating, as well as heat pumps. This flexibility makes it an attractive option for a wide range of households. Moreover, the thermostat supports both single-stage and multi-stage heating and cooling systems, which further broadens its applicability.

The White Rodgers 7904 also features an easy-to-read LCD display that shows the current temperature settings, time, and system status. This intuitive interface simplifies operation, making it easy for anyone to program and adjust settings as needed. The device is backed by a durable design, ensuring longevity and reliability for years to come.

In addition to its programmable capabilities and smart recovery technology, the 7904 includes a built-in filter change reminder. This feature helps homeowners maintain their HVAC systems by notifying them when it's time to replace or clean filters, contributing to optimal system performance and indoor air quality.

Overall, the White Rodgers 7904 is a well-rounded thermostat that combines advanced technology with user-friendly features to provide efficient temperature management. Homeowners looking for a reliable solution to enhance comfort, save energy, and maintain HVAC systems will find the 7904 to be an excellent choice. Its flexibility and ease of use make it a popular option among many households.