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

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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.

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27591 031597

 

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Contents Bunn HC-2 Serial # HC00025000 UPWarranty IntroductionUser Notices 12368.000227620.0000 Electrical HOOK-UP Initial SET-UPElectrical Requirements Plumbing RequirementsDispenser USE CleaningAdjustments Cold Beverage SET-UP OptionalTroubleshooting Draining the HOT Water TankHopper Dispense Rate of Product Troubleshooting Problem Probable Cause RemedyProblem On stainless steel surfaces can Problem Probable CauseDripping from dispense tip Lime build-up Ing in serious leaks30 or Weak product Water temperatureTesting procedure. See Tip with a thermometerTroubleshooting Problem Probable Cause RemedyContents ServiceComponent Access Auger Drive ComponentsWasher Auger Motor Locknut Dust Seal Shoulder Screw Auger Drive ComponentsIf voltage is present as described, proceed to #5 Hopper AssyService Right HC-2Test Procedure BallastLocation Location Mechanical Thermostat Remove temperature probe from the tankControl Thermostat Electronic Thermostat OptionalControl Thermostat Thermostat TerminalsDispense Switch Dispense SwitchTest Procedures FANRing Frother and Whipper MotorSteam Collector #6-32 Screw Mixing Chamber Pull the mixing chamber 2 out of the whipper chamberFrother and Whipper Motor Whipper Motor TerminalsHopper Delay Board Reconnect the eight pin connector to the hopper delay boardHOT/COLD Switch Optional Disconnect the wires from the switch termi- nalsLamp Replacement Refer to Fig Lamp HolderDoor Assy Service Level Control Board and Level Probe Level Control Board and ProbeLevel Board Terminals Limit ThermostatOverflow Protection Switch Overflow Protection SwitchRUN/RINSE Switch RUN/RINSE SwitchSolenoid Valve Cold Water Optional Cold Water Solenoid ValveCold Water Solenoid Terminals Solenoid Valves DispenseSolenoid Valves Dispense Disconnect the water line from the solenoid valveSolenoid Valve Inlet Solenoid Valve Inlet Tank HeaterRefer to when reconnecting the wires to the tank heater Tank Heater SwitchTank Heater Tank Heater Switch Tank Heater Switch TerminalsTransformer 240V TWO Wire MODELSONLYcontSchematic Wiring Diagram HC-2, & HC-3 Schematic Wiring Diagram HCA-2, & HCA-3
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