NOTE

NOTE

The following wiring diagrams show typical terminal identifica- tion and wiring. For proper installation, refer to the original manufacturer's instructions.

Thermostat

Control

Circuit

Y

Y2

G

W

W2

C*

Relay contacts shown are thermostatically operated.

*The 24 Volt neutral connection to terminal C on the thermostat is not required if you replace

the batteries once a year with fresh “AA” Energizer® alkaline batteries.

THERMOSTAT

R

Compressor

 

Heat

Contactor

 

Relay

Stage 2

 

Stage 1

Compressor

Fan

Heat

Contactor

Relay

Relay

Stage 1

Stage 2

 

SYSTEM

Hot

24 VAC

120 VAC

Neutral

TRANSFORMER

Figure 3. Typical wiring diagram for single transformer systems

 

CUT AND

Y

Y2

G

 

TAPE OFF!

 

 

 

Hot

 

 

Compressor

 

 

 

 

 

120 VAC

24 VAC

 

Contactor

 

Neutral

 

 

Stage 2

 

 

 

 

 

TRANSFORMER

 

 

 

 

Compressor

Fan

 

 

Contactor

 

 

Relay

 

 

Stage 1

 

 

 

 

 

Thermostat

Control

Circuit

W W2C*

Heat

Relay

Stage 1

Heat

Relay

Stage 2

*The 24 Volt neutral connection to terminal C on the thermostat is not required if you replace

the batteries once a year with fresh “AA” Energizer® alkaline batteries.

THERMOSTAT

R

SYSTEM

Hot

24 VAC

120 VAC

Neutral

TRANSFORMER

TWO COMMONS MUST

BE JUMPERED TOGETHER!

Figure 4. Typical wiring diagram for two-transformer systems with NO safety circuits

Thermostat

Control

Circuit

THERMOSTAT

Y

Y2

G

W

W2

C*

R

*The 24 Volt neutral connection to terminal C on the thermostat is not required if you replace

the batteries once a year with fresh “AA” Energizer® alkaline batteries.

Compressor

Contactor

Stage 2

Compressor

Fan

Contactor

Relay

Stage 1

Heat

Relay

Stage 1

Heat

Relay

Stage 2

SYSTEM

 

 

 

 

 

 

 

 

 

Limit or

 

Limit or

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Safety

Hot

Safety

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Switches

 

 

 

 

 

 

 

 

 

Switches 24 VAC

 

 

 

 

 

 

120 VAC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Neutral

24 VAC

 

 

 

Accessory

HEATING

Relay N.O.

TRANSFORMER

Contact

 

 

 

Common

TWO COMMONS MUST

BE JUMPERED TOGETHER!

 

Limit or

 

 

 

 

 

Limit or

 

 

 

 

Safety

 

 

 

 

 

Safety

 

Hot

Common

Switches

24 VAC

 

 

 

120 VAC

Switches

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Neutral

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

COOLING

 

 

 

 

 

 

 

TRANSFORMER

 

 

 

Figure 5. Typical wiring diagram for two-transformer systems with safety circuits in BOTH systems

3

Page 3
Image 3
White Rodgers 1f81-51 specifications Cut

1f81-51 specifications

The White Rodgers 1F81-51 is a highly regarded digital thermostat, designed for home comfort and efficiency. This model is widely recognized for its user-friendly interface, making it an excellent choice for homeowners looking to optimize their heating and cooling systems while maintaining budget-friendly energy consumption.

One of the standout features of the 1F81-51 is its programmable capabilities. The thermostat allows users to set distinct heating and cooling schedules for each day of the week, ensuring that the home remains comfortable during peak hours and conserving energy when residents are away. With four programmable periods per day, users can fine-tune settings to achieve an ideal home environment, which can significantly contribute to lower energy bills.

The 1F81-51 is also known for its easy-to-read display. The backlit screen provides clear visibility, even in low-light conditions, enabling quick adjustments or readings. The displayed temperature can be set to either Fahrenheit or Celsius, accommodating user preferences and making it suitable for various regions.

This model is equipped with advanced technology aimed at enhancing comfort and energy efficiency. The thermostat features a Smart Recovery function, which learns how long it takes to heat or cool the home to the desired temperature. By starting the heating or cooling process early, it ensures that the desired temperature is reached at the scheduled time without unnecessary overworking of the HVAC system.

Another advantage of the White Rodgers 1F81-51 is its compatibility with a variety of heating and cooling systems, including gas, electric, and heat pump systems. This versatility allows for easy integration into most home setups, making it a popular choice among both renters and homeowners.

In terms of installation, the 1F81-51 is designed to be user-friendly. The straightforward wiring options and included instructions make installation a manageable task, even for those with minimal experience in home improvement.

Overall, the White Rodgers 1F81-51 thermostat is a practical solution for anyone looking to enhance their home’s heating and cooling efficiency. With its programmable features, user-friendly interface, and smart technologies, it stands out as an effective tool for achieving consistent comfort while optimizing energy use. It embodies a perfect blend of functionality and efficiency, making it a smart investment for today's energy-conscious consumers.