White Rodgers Water Dispenser 8J48A User Manual

8J48A  
Relay-Hot Water Control  
For use with 24 VAC or Self-Generating Gas Valve  
WHITE-RODGERS  
(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  
valveaswellastherelaycoil. Onsystemszoneswithmotorized  
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.  
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.  
Do not exceed the specification ratings.  
All wiring must conform to local and national electrical codes  
and ordinances.  
WARNING  
!
This control is a precision instrument, and should be handled  
carefully.Roughhandlingordistortingcomponentscouldcause  
the control to malfunction.  
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  
ELECTRICAL RATINGS  
ROOM THERMOSTAT  
Input Voltage: 120 VAC, 60 Hz  
Circulator Motor: 8.0 Amps Full Load Current (120 VAC)  
Set adjustable heater (anticipator) at 0.25, or use a fixed heater  
with a 0.25 Amp rating.  
48.0AmpsLockedRotorCurrent(120VAC) HOT WATER CONTROLS  
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:  
Range: High Limit – 140° to 240°F. (Some models have a  
Preset Dial Stop. Adjustments should be made by  
authorized service personnel only.)  
Internal transformer (terminals TV and Z) may be used for Differential: High Limit – 8°F Fixed  
supplying power to four W-R Type 1311 or three Type 1361 Switch Action: High Limit – Open on rise  
zone Valves. (For other zone valves, total zone valve load is not  
to exceed 1.2 Amp.)  
WHITE-RODGERS DIVISION  
EMERSON ELECTRIC CO.  
9797 REAVIS ROAD  
PART NO. 37-4013C  
Printed in U.S.A.  
Replaces 37-4013B  
9522  
ST. LOUIS, MISSOURI 63123-5398  
 
WIRING AND OPERATION  
All wiring should be installed according to local and national electrical codes and ordinances.  
Figure4showswiringconnectionsforatypicalinstallationusing  
the 8J48A with a 36C03 or a 36C53 24V manifold gas valve.  
Figure 5 shows wiring connections for the 8J48A with a 36C03U  
or 36C53U self-generating gas valve. Operation is as follows:  
AUTO/MANUAL SWITCH  
NOTE  
For manual operation of self-generating millivolt systems  
only.  
As the room thermostat contacts close, the relay coil is ener-  
gized and closes its two sets of relay contacts. The manifold gas  
valveopensastheno.1relaycontactsclose,whilethecirculator  
motor starts as the no. 2 relay contacts close.  
The manual switch, located on the outside of the controls case,  
allows operation of the burner during power failures. When the  
switch is set to MANUAL, the burner will operate continuously  
until the high limit temperature is reached. The circulator, which  
requires line voltage to operate, will not function in MANUAL  
mode. When power is restored, reset the switch to AUTO to  
resume automatic operation.  
When the room thermostat opens its contacts, the manifold gas  
valve closes and the circulator motor stops.  
If the boiler temperature exceeds the setting of the high limit  
whilethethermostatiscallingforheat,thehighlimitwillclosethe  
gas valve but permit the circulator to run as long as the  
thermostat is calling for heat.  
Factory-  
installed installed  
Jumper Jumper  
Field-  
Manual  
Switch  
High  
Limit  
Transformer  
Z
W
TP  
B
No. 2 Relay  
Contacts  
No. 1 Relay  
Contacts  
C1  
Hot  
120 VAC  
Neutral  
Low Voltage  
Room Thermostat  
L1  
L2  
36C  
Gas Valve  
T
TH TH-TR TR  
C2  
TV  
B2  
B3  
B1  
INTERNAL WIRING  
Line Voltage  
Circulator  
Motor  
Low Voltage  
EXTERNAL WIRING  
Line Voltage  
Low Voltage  
Figure 4. 24 Volt AC Gas Valve  
Factory-  
installed  
Jumper  
Manual  
Switch  
High  
Limit  
Transformer  
Z
W
TP  
B
No. 2 Relay  
Contacts  
No. 1 Relay  
Contacts  
C1  
Hot  
120 VAC  
Neutral  
Low Voltage  
Room Thermostat  
L1  
L2  
To 750 MV  
Thermopile  
36C  
Gas Valve  
T
TH TH-PG PG  
C2  
TV  
B3 B2  
B1  
INTERNAL WIRING  
Line Voltage  
Circulator  
Motor  
Low Voltage  
EXTERNAL WIRING  
Line Voltage  
Low Voltage  
Figure 5. Millivolt Gas Valve  
3
 
WIRING AND OPERATION (cont’d)  
Thermostat  
Z
R
B
Low Limit  
Circulator  
Control  
8J48A  
BL  
W
2
W-R  
1361  
Zone  
TV  
Z
T
W
1
3
Valves  
NOTE: Remove external jumper  
between W and Z terminals  
C1  
L1  
C2  
L2  
Circulator  
Motor  
B1 B3  
Figure 7. Alternate Connections for using Separate  
Low Limit-Circulator Control on  
Boiler with Tankless Domestic Coil  
24V  
Gas  
Valve  
Hot Neutral  
LINE  
Figure 6. Typical Connections for  
Zoning with 2-Wire Zone Valves  
Thermostat  
Zone 1  
Thermostat  
Zone 2  
Thermostat  
Zone 3  
Field-  
Installed  
Jumper  
Field-  
Installed  
Jumper  
829A  
Relay  
829A  
Relay  
5
6
3
4
1
2
5
6
3
4
1
2
8J48A  
Factory-  
Installed  
Jumper  
T
W
Z
TV  
B
TP  
C1 C2  
Line Voltage  
Low Voltage  
Circulator  
Zone 1  
Circulator  
Zone 2  
Circulator  
Zone 3  
B1 B2 B3 L1 L2  
Neutral  
120 V  
36C Series  
Gas Valve  
Hot  
TR TH-TR TH  
Figure 8. 8J48A - 24 Volt Systems Zoned with Circulators  
Thermostat  
Zone 1  
Thermostat  
Zone 2  
Thermostat  
Zone 3  
Field-  
Installed  
Jumper  
Field-  
Installed  
Jumper  
829A  
Relay  
829A  
Relay  
5
6
3
4
1
2
5
6
3
4
1
2
8J48A  
Factory-  
Installed  
Jumper  
T
W
Z
TV  
B
TP  
C1 C2  
Line Voltage  
Low Voltage  
Circulator  
Zone 1  
Circulator  
Zone 2  
Circulator  
Zone 3  
B1 B2 B3 L1 L2  
Neutral  
To 750 MV  
Thermopile  
120 V  
Hot  
36C Series  
Gas Valve  
PG TH-PG TH  
Figure 9. 8J48A - Millivolt Systems Zoned with Circulators  
 

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