White Rodgers 8J48A User Manual

WHITE-RODGERS

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.

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.

8J48A

Relay-Hot Water Control

For use with 24 VAC or Self-Generating Gas Valve

(Suitable for External Zone Valve Load)

INST ALLA TION INSTRUCTIONS

DESCRIPTION

If in doubt about whether your wiring is millivolt, line, or low voltage, have it inspected by a qualified heating and air conditioning 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.

ELECTRICAL RATINGS Input Voltage: 120 VAC, 60 Hz Circulator Motor: 8.0 Amps Full Load Current (120 VAC)

48.0 Amps 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.)

PRECAUTIONS

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 damage may result from shorted or incorrect wiring.

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

EMERSON ELECTRIC CO. 9797 REAVIS ROAD ST. LOUIS, MISSOURI 63123-5398

Printed in U.S.A.

PART NO. 37-4013C

Replaces 37-4013B

9522

INSTALLATION

NOTE

If the boiler manufacturer recommends a control location, then follow such recommendations. Otherwise, locate the control as close to the top of the boiler as possible, but not in the same section of the boiler that has fittings for domestic hot water. Never locate the control near a return pipe to the boiler.

PREPARING TO MOUNT CONTROL

This control can be mounted vertically or horizontally.

1. Loosen the set-screw holding the well in place (see fig. 1).

2. Push down and out on the well and carefully slide the capillary tube in slot.

3. Place the well in new notch and tighten the set-screw to secure the well in the new position.

MOUNTING THE CONTROL

1. Disconnect electrical power to the boiler.

2. Completely drain the boiler.

3. If a well tapping is not provided, prepare one near the top of the boiler.

4. Sparingly apply pipe joint compound to the well threads and install well.

NOTE

Use hex on well for tightening the well. Do not attempt to tighten by using the case as a handle.

5. Refill the boiler and check for water leaks.

6. Insert the bulb element into the well until it bottoms.

7. Locate and secure the coil of excess tubing so that it cannot touch electrical components.

8. Fit the back of the case into the well and tighten using the setscrew on the back panel.

Slot

Capillary

Tube

Well

Set-screw

Figure 1

MOUNTING TO EXISTING WELL

(For use with well adaptor, which may be ordered separately.) For best control performance, a well comparable to that shown

in fig. 2 is recommended. However, by using a heat conductive grease, these controls will give satisfactory performance when used with large-diameter existing wells. If desired, both the conductive grease and replacement wells may be ordered separately (see fig. 2).

Well No. Description A B C

89-0211 89-0212 89-0213 89-0214 89-0215

Conductive Grease No. 145-0163

⁄2” Std. Shank

⁄2” Std. Ext. Shank

⁄4” Std. Shank

⁄4” Std. Ext. Shank

⁄4” Extra Ext. Shank

⁄16”

3” 3” 3” 3” 3”

⁄16”

DIAL SETTING

When replacing an existing control, adjust the setting of the high limit to correspond with that of the old control.

Set the pointer to the temperature at which the contacts of the high limit are to open (see fig. 3)

Models with a preset dial stop are to be adjusted by authorized service personnel only.

To reset the dial stop, loosen the stop adjust screw and reposition the stop to the desired setting.

Retighten the stop adjust screw.

WARNING

DO NOT set the stop higher than the original manufacturer’s recommended setting. Personal injury and/or property damage may result.

Figure 2

140

160 220

200180

Figure 3

Stop

Stop Adjust Screw

Pointer

+ 2 hidden pages