White Rodgers 8J48A User's Manual
Printed in U.S.A.
PART NO. 37-4013C
Replaces 37-4013B
9522
8J48A
Relay-Hot Water Control
For use with 24 VAC or Self-Generating Gas Valve
(Suitable for External Zone Valve Load)
INSTALLATION INSTRUCTIONS
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.
WHITE-RODGERS DIVISION
EMERSON ELECTRIC CO.
9797 REAVIS ROAD
ST. LOUIS, MISSOURI 63123-5398
WHITE-RODGERS
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY
BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE
PERSONAL INJURY AND/OR PROPERTY DAMAGE.
Operator: Save these instructions for future use!
To prevent electrical shock and/or equipment damage,
disconnect electric power to system, at main fuse or
circuit breaker box, until installation is complete.
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.
SPECIFICATIONS
PRECAUTIONS
CAUTION
!
WARNING
!
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.
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.)
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
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