NOTE

IF SAFETY CIRCUITS ARE IN ONLY ONE OF THE SYSTEMS, REMOVE THE TRANSFORMER OF THE SYSTEM WITH NO SAFETY CIRCUITS.

CUT AND

TAPE OFF!

Hot

120vAC

24vAC

Neutral

TRANSFORMER

O

B

Y1

Y2

G

W1

Changeover

 

Compressor

 

Heat

Energized

 

Contactor

 

Relay

In Heat

 

Stage 2

 

Stage 1

Changeover

Compressor

Fan

 

Energized

Contactor

 

Relay

 

In Cool

Stage 1

 

 

 

HEAT PUMP SYSTEM

 

 

 

Thermostat

 

 

 

Control

 

 

 

Circuit

E1

E2

W2 W3

C

Emergency

Heat

 

 

Relay

Relay

 

 

Constant

 

 

Stage 3

 

 

Output

 

 

 

 

Emergency

Heat

 

Relay

Relay

 

Switched

 

 

Output

Stage 2

 

 

 

 

 

AUXILIARY HEATING SYSTEM

Malfunction

Light

THERMOSTAT

L

 

 

R

 

 

System

 

 

 

 

 

 

SYSTEM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Limit or

 

 

 

Monitor

 

 

 

 

 

 

 

Safety

 

 

 

Switch

 

 

 

 

 

 

Switches

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TRANSFORMER

Limit or

 

 

 

Safety

 

 

 

 

 

 

 

 

Hot

 

 

 

 

 

 

 

 

Switches

 

 

 

 

 

 

 

 

 

 

 

24vAC

 

 

 

 

 

120vAC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Neutral

 

 

 

 

 

 

 

 

 

DEPENDING ON SYSTEM REQUIREMENTS, REPLACE WITH A 75VA TRANS-

TWO COMMONS MUST

BE JUMPERED TOGETHER!

FORMER, IF NEEDED

Figure 5. Typical wiring diagram for two-transformer system with NO safety circuits

NOTE

Relay contacts shown are thermostatically operated. The accessory relay scheme is required when safety circuits exist in both systems.

!CAUTION

Polarity must be observed. If the HOT side of the second transformer is jumpered to the COMMON side of the first transformer a short will be made. Damage to equipment will occur when power is restored.

Thermostat

Malfunction

Light

Control

 

Circuit

 

O

B

Y1

 

Y2

 

G

 

W1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Changeover

 

 

Compressor

 

 

 

 

 

Heat

 

 

Energized

 

 

Contactor

 

 

 

 

 

Relay

 

 

In Heat

 

 

Stage 2

 

 

 

 

Stage 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Changeover

 

 

Compressor

 

 

 

 

Fan

 

 

 

Energized

 

 

Contactor

 

 

 

 

 

 

 

 

 

 

 

 

Relay

 

 

 

In Cool

 

 

Stage 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

E1

 

E2

 

W2

 

W3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Emergency

 

 

 

 

Heat

 

 

 

Relay

 

 

 

 

Relay

 

 

 

Constant

 

 

 

 

 

 

 

 

 

 

 

Stage 3

 

 

 

Output

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Emergency

 

 

 

Heat

 

 

 

Relay

 

 

 

Relay

 

 

 

Switched

 

 

 

 

 

 

 

Stage 2

 

 

Output

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CL R

System

Monitor

Switch

 

 

 

 

 

 

 

 

THERMOSTAT

 

 

 

 

 

 

 

 

 

SYSTEM

 

 

 

 

 

 

 

 

 

 

 

 

Limit or

 

 

 

 

 

 

 

 

Limit or

 

Safety

 

 

 

 

 

 

 

Hot

Safety

 

 

 

 

 

 

 

Switches

 

 

 

 

 

 

 

Switches

 

24vAC

 

 

 

 

 

120vAC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Neutral

 

 

 

 

 

 

 

 

 

 

 

 

24vAC

 

 

AUXILIARY

 

 

Accessory

 

 

 

HEATING

 

 

Relay N.O.

 

TRANSFORMER

 

 

Contact

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HEAT PUMP SYSTEM

AUXILIARY HEATING SYSTEM

TWO COMMONS MUST

BE JUMPERED TOGETHER!

Limit or

Safety

Switches

 

 

 

 

 

 

 

 

Limit or

 

 

 

 

 

 

 

 

Hot

Safety

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Switches

 

24vAC

 

 

 

 

 

 

120vAC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Neutral

HEAT PUMP

TRANSFORMER

Figure 6. Typical wiring diagram for two-transformer system with safety circuits in BOTH systems

5

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Image 5
White Rodgers 1F92-71 installation instructions Depending on System REQUIREMENTS, Replace with a 75VA Trans

1F92-71 specifications

The White Rodgers 1F92-71 is a programmable thermostat designed to provide efficient temperature control for residential heating and cooling systems. Known for its user-friendly features and advanced technology, the 1F92-71 is a favorite among homeowners looking for convenience and energy savings.

One of the standout features of the White Rodgers 1F92-71 is its easy-to-read digital display. The large screen provides clear visuals of the current temperature, setpoint, and operational modes, making it simple for users to monitor and adjust their home’s heating and cooling settings. The intuitive interface allows for easy programming, so users can create customized heating and cooling schedules to fit their lifestyle.

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Overall, the White Rodgers 1F92-71 represents a combination of practicality, technology, and user-oriented design, making it a top choice for those seeking to enhance their home’s climate control systems.