Wiring

All wiring must conform to local and national electrical codes and ordinances.

Connect in accordance with the wiring diagrams provided by the equipment manufacturer. If none are provided, the following represents a typical installation.

Jumper

 

Factory Installed

Optional Remote

On Some Models

Manual Switch

CAUTION: Line voltage jumper is factory installed on some models. This jumper must be removed when limit switch is used in low voltage or millivolt circuit.

 

 

For Summer Fan

To Oil Burner

Limit

Fan

Switch

Switch

Control Or

 

 

Transformer Primary

 

L1

 

 

Fan

 

Line

Motor

 

L2

 

 

 

 

Note: Make L1 “HOT” on

To Low Voltage

Or Millivolt

Burner Circuit

Fan

Motor

Limit

Fan

Switch

Switch

Optional Remote

Manual Switch

For Summer Fan

L1

Line

120V installation

Diagram Using Limit In Line Voltage Circuit

L2

Note: Make L1 “HOT” on 120V installation

Diagram Using Limit In Low Voltage

or Millivolt Circuit

OPERATION

SUMMER FAN OPERATION

The cover does not have to be removed to access the lever. To turn the fan on, slide the lever to the left “MAN” position. To turn the fan off, slide the lever to the right “AUTO” position.

For automatic operation of the fan during the heating or cooling season, the lever must be in the “AUTO” position.

SETTING THE DIAL

To set pointers, hold dial securely with one hand and move the pointers with the other hand. Do not force the pointers past any stops on the dial even though the dial may be graduated beyond the stops.

Limit

Move the right hand pointer so that its straight edge indicates the temperature at which the contacts should open. The limit pointer should never be set any higher than the setting recommended by the furnace manufac- turer.

Fan

Move the “Fan On” pointer so that its straight edge indicates the temperature at which the fan contacts should close to start the blower. Move the “Fan Off” pointer so that its straight edge indicates the temperature at which the fan contacts should open to stop the blower.

MAN

AUTO

Right Hand

Pointer

Center (Limit Opens)

Pointer

(Fan On)

Limit Stop

Left Hand

 

 

 

 

Pointer

 

 

 

200

(Fan Off)

 

1

0

 

 

5

 

1

0

0

 

 

 

 

0

 

 

 

 

0

0

 

 

 

 

5

 

 

 

 

FAN LIMIT

HOLD DIAL WHEN

CHANGING INDICATORS

DO NOT ADJUST

SAFETY STOP

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White Rodgers 5D51-35, 5D51-90, 5D51-78 installation instructions Setting the Dial, Summer FAN Operation

5D51-90, 5D51-35, 5D51-78 specifications

The White Rodgers 5D51 series is a range of high-quality thermostat controls designed for HVAC systems, offering enhanced comfort and efficiency in temperature regulation. Within this series, the models 5D51-35, 5D51-78, and 5D51-90 are particularly notable for their innovative features and reliable performance.

The 5D51-35 is designed for both gas and oil heating, providing flexibility and compatibility across various heating systems. Its intuitive interface allows users to easily set their desired temperatures, with a clear display showing real-time data. One of its standout features is the ability to control a wide range of systems, including single-stage heating, cooling, and even multi-stage systems, enhancing its versatility in different applications.

The 5D51-78 model elevates functionality with additional programmable options. This thermostat can be set to follow specific schedules, automatically adjusting temperatures according to user-defined patterns. This feature not only maximizes comfort but also helps in reducing energy consumption, making it an environmentally friendly choice. The 5D51-78 also boasts a large, easy-to-read LCD display and a user-friendly layout, simplifying operation for homeowners.

The advanced 5D51-90 takes technology a step further with its smart capabilities. This thermostat incorporates a digital logic circuitry that ensures precise temperature control. It also features adaptive recovery technology, meaning it learns the user’s habits and adjusts preheating or cooling cycles to achieve the desired temperature at the specified time. Additionally, the 5D51-90 model supports various communication protocols, enabling connections with more sophisticated home automation systems.

Across all three models, durability and reliability are key characteristics, ensuring they operate effectively over time even in demanding environments. The user-friendly design, sophisticated technology, and energy-saving features make the White Rodgers 5D51 series an excellent choice for homeowners looking to optimize their HVAC systems. With these thermostats, users can enjoy personalized comfort while also contributing to greater energy efficiency in their homes.