Bunn TWIN service manual Refill Valve, Check for continuity across the refill valve coil terminals

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SERVICE (cont.)

REFILL VALVE

J3

J4

J6

P1874

FIG. 15 REFILL VALVE

Location:

The refill valves are located inside the trunk on the lower center part of the component brackets.

Test Procedures:

1.Disconnect the brewer from the power source.

2.Disconnect the white and white/blue wires from the refill valve. Set the "ON/OFF" switch in the "ON" upper position.

3.With a voltmeter, check the voltage across the coil wires. Connect the brewer to the power source. The indication must be 120 volts ac.

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 Diagrams and check brewer wiring harness.

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

If continuity is present as described, reconnect the white and white/blue wires from the circuit board.

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

6.Check the refill valve for coil action. Connect the brewer to the power source. With "ON/OFF" switch in the "ON' upper position press start switch and listen carefully in the vicinity of the refill valve for a" clicking" sound as the coil magnet attracts.

7.Disconnect the brewer from the power source.

If the sound is heard as described and water will not pass through the refill valve, there may be a blockage in the water line before the refill 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 refill valve.

Removal and Replacement:

1.Remove both wires from the refill valve.

2.Turn off the water supply to the brewer.

3.Disconnect the water lines to and from the refill valve.

4.Remove the two 1/4"-20 screws securing the refill valve mounting bracket to the component bracket. Remove bracket and valve as an assembly.

5.Using two 1/4"-20 screws install the new refill valve and bracket to the component bracket.

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

7.Refer to FIG. 16 when reconnecting the wires.

WHI from Terminal

Block

WHI/BLU from

Control Board

P1858

FIG. 16 REFILL VALVE WIRING

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29319 091203

 

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Contents CEZ Cdbc Twin Contents IntroductionUser Notices Electrical Hook-Up Electrical RequirementsPlumbing Requirements ON/OFF Switch Brew SwitchAdditional Warmer Switches Ready IndicatorCoffee Brewing CleaningInitial SET-UP CEZ Adjustments & Optional Settings Cdbc Adjustments & Optional Settings Setting Brew TemperatureDisplaying Brew Temperature Setting Brew LockoutAdjusting Brew Volumes Pulse Brew Setup Procedure Cdbc Twin & Cdbcf Twin Troubleshooting Before troubleshooting this brewer, check for the followingTroubleshooting Refill Circuit ProblemProbable Cause RemedyProblem Probable Cause Remedy Heating Circuit Problem Probable Cause Remedy 4b. Temperature Probe CEZ Remove the probe from 3 of the J5 connector. AtIngs are taken Control board4 of the J3 connector. At 2b. Temperature Probe CEZ Remove the probe fromSet the temperature to 200F Bilize. If temperature in tank isBrewing Circuit Problem Brew cycle will not startTroubleshooting Brewing Circuit Probable Cause Remedy Move the two wires. Check for Supply and check wiringSwitch Holes are clear and unobDiagnostics Cause Things to CheckContents ServiceComponent Access Service PC Control Board Model Cdbc Disconnect the 11-pin connector from the control panelService PC Control Board Model CEZ Control Boards CEZService Switch Panel Model Cdbc Switch Panels CdbcService ON/OFF Switches Model CEZ Minals when the switch is released Service Brew Switch Start Model CEZBottom switch terminal Service Dispense ValveLimit Thermostat Limit ThermostatsTank Heaters Tank HeaterService Tank Heaters Tank Heater WiringRefill Valve Check for continuity across the refill valve coil terminalsWarmer Elements Warmer ElementsSchematic Wiring Diagram CEZ Twin 0/6 Left Schematic Diagramwiring Twincdbc Schematic Wiring Diagram Cdbc Twin 2/2 Right
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TWIN specifications

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