Bunn HC-3 service manual SOLENOID VALVE INLET cont, Tank Heater, SERVICE cont

Models: HC-3

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SOLENOID VALVE (INLET) (cont.)

SERVICE (cont.)

SOLENOID VALVE (INLET) (cont.)

If continuity is not present as described, replace the solenoid valve.

6.Check the solenoid valve for coil action. Connect the dispenser to the power source. Listen care- fully in the vicinity of the solenoid valve for a "clicking" sound as the coil magnet attracts.

7.Disconnect the dispenser from the power source.

If the sound is heard as described and water will not pass through the solenoid valve, there may be a block- age in the water line before the solenoid valve or, the solenoid valve may require inspection for wear, and removal of waterborne particles.

If the sound is not heard as described, replace the solenoid valve.

Removal and Replacement:

1.Remove the white and violet wires from the so- lenoid valve.

2.Turn-off the water supply to the dispenser.

3.Disconnect the water lines to and from the sole- noid valve.

4.Remove the two #10-32 screws and nuts secur- ing the solenoid to the rear panel. Remove sole- noid.

5.Using two #10-32 screws and nuts install new solenoid valve on rear panel.

6.Securely fasten the water lines to and from the solenoid valve.

7.Refer to Fig. 28 when reconnecting the wires.

WHI from Terminal

Block

VIO from Liquid

Level Board

P1217

FIG. 28 INLET SOLENOID VALVE TERMINALS

TANK HEATER

FIG. 29 TANK HEATER

P1199.40

 

Location:

 

The tank heater is located inside the tank and secured to the tank lid.

Test Procedure:

1.Disconnect the dispenser from the power source.

2.Check the voltage across the black and white wires 120 volt models or black and red wires for 120/208 volt models or 120/240 volt models with a voltme- ter. Connect the dispenser to the power source. The indication must be:

a)120 volts ac for two wire 120 volt models;

b)208 volts ac for three wire 120/208 volt models.

c)240 volts ac for three wire 120/240 volt models and two wire 240 volt models.

3.Disconnect the dispenser from the power source.

If voltage is present as described, proceed to #4.

If voltage is not present as described, refer to the dispenser wiring diagram and check the wiring har- ness.

4.Disconnect the black wire and the white or red wire from the tank heater terminals.

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27591 031597

 

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Bunn HC-3 SOLENOID VALVE INLET cont, Tank Heater, SERVICE cont, WHI from Terminal Block VIO from Liquid Level Board