SERVICE (cont.)

SWEETNER SOLENOID VALVE

P3298

FIG. 16 SWEETNER SOLENOID VALVE

Location:

Viewing the brewer from the front, the sweetener solenoid is mounted on the right side of the solenoid mounting bracket which is secured to the bottom base housing.

Test Procedure:

1.Disconnect the brewer from the power source.

2.With a voltmeter, check the voltage across the brown/white and white/violet wires on the sweet- ener solenoid terminals when the UNSWEET/OFF/ SWEET switch is in the “SWEET” position and the start switch is momentarily placed in the lower position. Connect the brewer to the power source. After the approximate setting on the delay dial, 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, remain for the approximate setting on the dilution dial, and then return to its previous indication.

3.Disconnect the brewer from the power supply.

If voltage is present as described, proceed to #4.

If voltage is not present as described, refer to the Wir- ing Diagrams and check the wiring harness.

4.Remove both wires from the coil and check for continuity across the coil terminals. If continuity is present as described, reconnect the brown/white and white/violet wires and proceed to #5.

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

5.Check the solenoid valve for coil action. Connect the brewer to the power source, place the UNSWEET/OFF/SWEET switch in the “SWEET” po- sition and momentarily place the start switch in the lower position and release. At the start of a brew cycle, listen carefully in the vicinity of the solenoid valve for a “clicking” sound as the coil magnet attracts and at the end of the brew cycle when the plunger is released.

6.Disconnect the brewer from the power source.

If the sound is heard as described and sweetener will not pass through the solenoid valve, there may be a blockage in the sweetener line before or after the so- lenoid valve or, the solenoid valve may require inspec- tion for wear, and removal of particles.

If the sound is not heard as described, replace the solenoid valve.

Removal and Replacement:

1.Remove all wires from the solenoid valves.

2.Turn off the sweetener supply to the brewer.

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

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

5.Lift out the valve and 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 solenoid valve and bracket to the mounting bracket.

9.Securely fasten the sweetener and water lines to and from the solenoid valves.

10.Refer to Fig. 17 when reconnecting the wires.

WHI/VIO to Brew Solenoid

WHI/VIO to Brew Timer TL1

BRN/WHI to Selector

Switch

P2843

FIG. 17 SOLENOID VALVE TERMINALS

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Bunn TB3Q-LP service manual Sweetner Solenoid Valve
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TB3Q, TB3Q-LP specifications

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