Bunn TU3Q service manual Service, Brew Solenoid Valve, Solenoid valve, Location

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SERVICE (cont.)

If continuity is not present as described, replace the

BREW SOLENOID VALVE

solenoid valve.

FIG. 2 BREW SOLENOID VALVE

P2087.40

 

Location:

Viewing the brewer from the top, the brew sole- noid valve is mounted on the right side of the brewer.

Test Procedures:

1.Disconnect the brewer from the power source.

2.Disconnect the white/violet and white/green wires from the solenoid valve. With the ON/OFF switch in the "ON" position ("UNSWEET" or "SWEET" po- sition for brewers with sweetener option), press the start switch.

3.With a voltmeter, check the voltage across the white/violet and white/green wires. Connect the brewer to the power source. The indication must be:

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

b)230 volts ac for two wire 230 volt models.

c)100 volts ac for two wire 100 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 Diagrams and check brewer wiring harness.

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

If continuity is present as described, reconnect the white/violet from the brew timer and white/green wire from the brew timer.

6.Check the solenoid valve for coil action. Connect the brewer to the power source. With ON/OFF switch in the "ON" position ("UNSWEET" position for brewers with sweetener option), press START switch and listen carefully in the vicinity of the solenoid 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 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 all wires from solenoid valve.

2.Turn off the water supply to the brewer.

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

4.Remove the two #8-32 keps nuts holding the mounting bracket to the hood.

5.Lift out the bracket.

6.Remove the two #10-32 slotted-head screws hold- ing the solenoid valve to the mounting bracket.

7.Securely install the new solenoid valve to the mounting bracket.

8.Attach the mounting bracket to the hood.

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

10.Refer to the Fig. 3 when reconnecting the wires.

WHI/VIO to

Brew Timer TL1

WHI/GRN to

Brew Timer TL4

BREW SOLENOID

P2843

FIG. 3 SOLENOID VALVE TERMINALS

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Contents Phone 217 529-6601 FAX 217 TU3QContents BUNN-O-MATIC Commercial Product WarrantyIntroduction User Notices #00831.0000 #00656.0000#03408.0002 #03409.0002 #03408.0000 #03536.0000 #03409.0000 Electrical Requirements Plumbing RequirementsElectrical Hook-Up Auto Sweetener SET-UP Initial SET-UPAuto Sweetener SET-UP Adjusting Brew VolumesCleaning Auto Sweetener CleaningOperating Controls TEA Brewing Troubleshooting Problem Probable CauseRemedy Remedy TroubleshootingProblem Probable CauseProblem Probable Cause Dispenser Beverage overflows dispenser Brew TimerDripping from sprayhead Syphon System Lime Build-upProblem Probable Cause Remedy Component Access ServiceSolenoid valve ServiceTest Procedures Disconnect the brewer from the power source Brew Solenoid ValveWiring Diagram and check the wiring harness Brew Timer Early ModelsIf voltage is as described, proceed to #7 Service Digital Brew Timer Late ModelsDigital Timer Wiring Control Thermostat Control ThermostatLimit Thermostat Limit ThermostatOn the switch terminal ON/OFF SwitchRefer to when reconnecting the wires Location Switch terminalsStart Switch Start SwitchTank Heater Sweetener Solenoid Valve Optional OFF/SELECTOR Switch Volts AC 2 Wire Single Phase Schematic Wiring Diagram TU3QVolts AC Wire