White Rodgers 8J48A specifications Wiring and Operation cont’d, Low Limit-Circulator Control on

Page 4

WIRING AND OPERATION (cont’d)

Thermostat

W-R

2

 

 

Z

R B

 

8J48A

BL

Low Limit

 

Circulator

 

 

 

Control

TV

T

W

W

1361

Zone 1 3 Valves

Z

 

 

 

 

 

 

NOTE: Remove external jumper

 

 

 

 

 

 

 

 

 

C1

 

C2

Circulator

between W and Z terminals

 

 

 

B1

B3

 

 

Figure 7. Alternate Connections for using Separate

 

 

 

Motor

 

 

L1

 

L2

 

 

 

 

 

 

 

 

Low Limit-Circulator Control on

 

 

 

 

 

 

 

Boiler with Tankless Domestic Coil

24V Hot Neutral

 

 

 

 

 

Gas

LINE

 

 

 

Valve

 

 

 

 

 

Figure 6. Typical Connections for

Zoning with 2-Wire Zone Valves

 

Thermostat

 

Thermostat

Thermostat

 

 

Zone 1

 

 

Zone 2

Zone 3

 

 

 

 

 

 

 

829A

 

Field-

829A

 

Field-

 

 

 

 

 

 

 

 

Installed

 

Installed

 

 

 

 

 

 

 

Relay

 

Jumper

Relay

 

Jumper

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

3

1

5

3

1

 

 

 

 

 

 

 

6

4

2

6

4

2

 

 

 

 

 

8J48A

 

 

 

 

 

 

Factory-

T

W

TV

 

 

 

 

 

 

 

 

 

Installed

 

 

 

 

 

 

 

 

 

 

 

 

Jumper

TP

Z

B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Line Voltage

 

 

 

C1

C2

 

 

 

 

 

 

 

Low Voltage

B1

B2

B3

L1

L2

Circulator

 

Circulator

 

 

Circulator

 

 

 

 

 

 

 

 

 

 

 

 

Zone 1

 

Zone 2

 

 

Zone 3

Neutral

36C Series

 

 

 

 

 

 

 

 

 

 

 

120 V

 

 

 

 

 

 

 

 

 

 

 

Hot

Gas Valve

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TR TH-TR TH

Figure 8. 8J48A - 24 Volt Systems Zoned with Circulators

 

Thermostat

 

Thermostat

Thermostat

 

 

Zone 1

 

 

Zone 2

Zone 3

 

 

 

 

 

 

 

829A

 

Field-

829A

 

Field-

 

 

 

 

 

 

 

 

Installed

 

Installed

 

 

 

 

 

 

 

Relay

 

Jumper

Relay

 

Jumper

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

3

1

5

3

1

 

 

 

 

 

 

 

6

4

2

6

4

2

 

 

 

 

 

8J48A

 

 

 

 

 

 

Factory-

T

W

TV

 

 

 

 

 

 

 

 

 

Installed

 

 

 

 

 

 

 

 

 

 

 

 

Jumper

TP

Z

B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Line Voltage

 

 

 

C1

C2

 

 

 

 

 

 

 

Low Voltage

B1

B2

B3

L1

L2

Circulator

 

Circulator

 

 

Circulator

 

 

 

 

 

 

To 750 MV

 

 

 

 

 

Zone 1

 

Zone 2

 

 

Zone 3

Neutral

Thermopile

 

 

 

 

 

 

 

 

 

 

 

120 V

 

 

 

 

 

 

 

 

 

 

 

 

36C Series

 

 

 

 

 

 

 

 

 

 

 

Hot

Gas Valve

 

 

 

 

 

 

 

 

 

 

 

 

PG TH-PG TH

 

 

 

 

 

 

 

 

 

 

Figure 9. 8J48A - Millivolt Systems Zoned with Circulators

Image 4
Contents Installation Instructions PrecautionsSpecifications Operator Save these instructions for future useDial Setting InstallationWell No Description Wiring and Operation Volt AC Gas ValveLow Limit-Circulator Control on Wiring and Operation cont’dBoiler with Tankless Domestic Coil

8J48A specifications

The White Rodgers 8J48A is a cutting-edge digital thermostat that has gained recognition for its reliability and efficiency. As a product of White Rodgers, a brand with a longstanding reputation in heating and cooling controls, the 8J48A embodies a range of features and technologies designed to enhance user experience while optimizing energy consumption.

One of the main features of the 8J48A is its simplicity of use. Its intuitive interface includes a clear LCD display, making it easy for users to adjust settings according to their comfort preferences. The thermostat offers a set of programmable options that allow users to customize their heating and cooling schedules based on their daily routines. This programmability not only improves comfort but also contributes significantly to energy savings by reducing unnecessary heating or cooling during unoccupied periods.

In terms of technology, the White Rodgers 8J48A utilizes advanced sensing technology that ensures accurate temperature readings and allows for precise control over indoor climates. This level of accuracy is crucial for maintaining optimal comfort while minimizing energy expenditure. Additionally, the thermostat supports multiple climate control systems, making it versatile and suitable for various HVAC setups, including gas, electric, and heat pump systems.

Another noteworthy characteristic of the 8J48A is its adaptability to different home environments. The thermostat can operate in various modes—such as heating, cooling, and even emergency heat—further enhancing its functionality. The temporary hold feature allows users to override programmed temperatures for a limited time without having to reprogram the entire schedule. This is particularly useful for unexpected changes in routine or short-term events.

Moreover, the White Rodgers 8J48A is equipped with a battery backup feature, ensuring that its settings remain intact in the event of a power outage. This reliability is key for homeowners who prioritize consistent indoor climate control.

Overall, the White Rodgers 8J48A digital thermostat stands out due to its combination of user-friendly features, advanced technology, and adaptability to various heating and cooling systems. It represents a smart investment for homeowners looking for an efficient and convenient way to manage their indoor temperatures while achieving energy savings. Whether through its programming capabilities or its ease of use, the 8J48A exemplifies what modern thermostats can offer in terms of comfort and efficiency.