Bunn HC-3 service manual Solenoid Valve Cold Water - Optional, SERVICE cont

SERVICE (cont.)

SOLENOID VALVE (COLD WATER - OPTIONAL)

P1214.45

FIG. 25 COLD WATER SOLENOID VALVE

Location:

The cold water solenoid valve is located on the left side of the dispenser base just behind the hop- per delay board.

Test Procedures:

1.Disconnect the dispenser from the power source.

2.Disconnect the white and white/yellow wires from the solenoid valve. With the “HOT/COLD” switch in the "COLD" upper position press the left dispense switch on front of the door.

3.Check the voltage across the white and white/ yellow wires with a voltmeter. Connect the dis- penser 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 brewer 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/yellow 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 brewer to the power source. With "HOT/COLD" switch in the "COLD" upper position press the left dispense switch and listen carefully in the vicin- ity 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 white/yellow wires from the solenoid 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 #8-32 keps nuts and washers securing the solenoid mounting bracket to the base. Remove solenoid bracket and solenoid valve as an assembly.

5.Remove the two #10-32 screws and lockwashers securing the solenoid valve to the solenoid bracket.

6.Using two #10-32 screws and lockwashers in- stall new solenoid valve on solenoid mounting bracket.

7.Using two #8-32 keps nuts and washers install solenoid valve and bracket to the base of the dis- penser.

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

9.Refer to Fig. 26 when reconnecting the wires.

30 27591 031597