Bunn TB3Q-LP service manual SERVICE cont, Brew Solenoid Valve, solenoid valve

SERVICE (cont.)	If continuity is not present as described, replace the
BREW SOLENOID VALVE	solenoid valve.

P3046

FIG. 2 BREW SOLENOID VALVE

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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