Bunn HC-3 service manual Cold Water Solenoid Terminals, Solenoid Valves Dispense

SERVICE (cont.)

SOLENOID VALVE (COLD WATER - OPTIONAL) (cont.)

WHI/YEL to Hot/Cold

Switch

WHI to Terminal Block

P1215

FIG. 26 COLD WATER SOLENOID TERMINALS

SOLENOID VALVES (DISPENSE)

FIG. 27 DISPENSE SOLENOID VALVES P1203.45

Location:

The dispense solenoids are located on the upper right side of the tank.

Test Procedures:

1.Disconnect the dispenser from the power source.

2.Disconnect the white and white/violet, white/blue or white/ brown wires from the solenoid valve. With the “RUN/RINSE” switch in the "RINSE" upper position press the appropriate dispense switch on front of the door.

3.Check the voltage across the white and white/ violet, white/blue or white/brown wires with a voltmeter. Connect the dispenser to the power source. The indication must be 120 volts ac for two wire 120 volt models, three wire 120/208, 120/240 volt models and 240 volts ac for two wire 240 volt models.

4.Disconnect the dispenser from the power source,

If voltage is present as described, proceed to #5

If voltage is not present as described, refer to wiring diagram and check dispenser wiring harness.

5.Check for continuity across the solenoid valve coil terminals.

If continuity is present as described, reconnect the white and white/violet, white/blue or white/brown wires to the solenoid.

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. With "RUN/ RINSE" switch in the "RINSE" upper position press the appropriate dispense switch and listen care- fully in the vicinity of the solenoid valve for a "click- ing" 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 outlet 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 white/violet, white/blue or white/ brown wires from the solenoid valve.

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

31 27591 031597