White Rodgers 8J48A specifications Installation Instructions, Description, Precautions

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8J48A

WHITE-RODGERS

Relay-Hot Water Control

For use with 24 VAC or Self-Generating Gas Valve

(Suitable for External Zone Valve Load)

INSTALLATION INSTRUCTIONS

Operator: Save these instructions for future use!

FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL INJURY AND/OR PROPERTY DAMAGE.

DESCRIPTION

These relay-hot water controls combine a high limit control, a transformer, a circulator relay, and wiring terminals into a single unit. They are suitable for use on boilers equipped with a 24 volt or millivolt gas valve.

These controls are designed primarily for use on boilers that do not supply domestic hot water. (However, they are equipped with an extra terminal to permit them to be used on boilers with a tankless domestic coil by the addition of a separate SPDT low limit-circulator control on systems using a 24 volt gas valve.)

The internal transformer supplies power for operating a gas valve as well as the relay coil. On systems zones with motorized water valves, the internal transformer may also be used for powering some (or all) of the water valves.

PRECAUTIONS

If in doubt about whether your wiring is millivolt, line, or low voltage, have it inspected by a qualified heating and air condi- tioning contractor, electrician, or someone familiar with basic electricity and wiring.

Do not exceed the specification ratings.

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

This control is a precision instrument, and should be handled carefully. Rough handling or distorting components could cause the control to malfunction.

!CAUTION

To prevent electrical shock and/or equipment damage, disconnect electric power to system, at main fuse or circuit breaker box, until installation is complete.

!WARNING

Do not use on circuits exceeding specified voltage. Higher voltage will damage control and could cause shock or fire hazard.

Do not short out terminals on gas valve or primary control to test. Short or incorrect wiring will burn out heat anticipator. Personal injury and/or property dam- age may result from shorted or incorrect wiring.

ELECTRICAL RATINGS

Input Voltage: 120 VAC, 60 Hz

Circulator Motor: 8.0 Amps Full Load Current (120 VAC)

48.0Amps Locked Rotor Current (120 VAC)

Gas Valve: 24.0 VAC, 0.65 Amp OR

Millivolt Systems (0.25 to 1.0 VDC, 0.25 Amp)

Combined Load of Zone Valves:

Internal transformer (terminals TV and Z) may be used for supplying power to four W-R Type 1311 or three Type 1361 zone Valves. (For other zone valves, total zone valve load is not to exceed 1.2 Amp.)

SPECIFICATIONS

ROOM THERMOSTAT

Set adjustable heater (anticipator) at 0.25, or use a fixed heater with a 0.25 Amp rating.

HOT WATER CONTROLS

Range: High Limit – 140° to 240°F. (Some models have a Preset Dial Stop. Adjustments should be made by authorized service personnel only.)

Differential: High Limit – 8°F Fixed

Switch Action: High Limit – Open on rise

WHITE-RODGERS DIVISION

 

PART NO. 37-4013C

EMERSON ELECTRIC CO.

 

Printed in U.S.A.

Replaces 37-4013B

9797 REAVIS ROAD

 

9522

ST. LOUIS, MISSOURI 63123-5398

 

 

 

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Contents Precautions Installation InstructionsSpecifications Operator Save these instructions for future useDial Setting InstallationWell No Description Volt AC Gas Valve Wiring and OperationLow 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.