White Rodgers 8J48A specifications Installation Instructions, Description, Precautions

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