SERVICE (cont.)

SOLENOID

P2209.60

FIG. 22 SOLENOID

Location:

The solenoid is mounted on the upper left rear of the component bracket.

Test Procedures:

1.Disconnect the dispenser from the power source.

2.A) For 120/208 volt and 120/240 volt three wire, single phase models, 380 volt three wire, three phase models and 380 volt, 440 volt four wire, three phase models, disconnect the black wire from the liquid level board #2 and the white wire on the solenoid. With a voltmeter, check the voltage across the black and the white wire. Connect the brewer to the power source. The indication must be:

a)120 volts ac for 380 volt three wire, three phase models and 208 0r 240 volts ac for four wire three phase 440 volt models.

b)208 volts ac for three wire 120/208 volt mod- els.

c)240 volts ac for three wire 120/240 volt mod- els.

B) For 208 volt, 240 volt two wire single phase and 208 volt, 240 volt three wire three phase models, disconnect the black wire from the liquid level board #2 and the red wire from the solenoid. With a voltmeter, check the voltage across the black and red wires. Connect the brewer to the power source. The indication must be:

a)208 volts ac for 208 volt two wire single phase and 208 volt three wire three phase models.

b)240 volts ac for 240 volt two wire single phase and 240 volt three wire three phase models.

C) For 230V - CE two wire single phase models, disconnect the red wire from the liquid level board #2 and the black wire from the solenoid. With a voltmeter, check the voltage across the red wire and the black wire. Connect the brewer to the power source. The indication must be 230 volts ac.

3.Disconnect the dispenser from the power source.

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

If voltage is not present as described, refer to the brewer Wiring Diagrams and check the wiring harness.

4.Disconnect the blue wire and the white wire, the blue wire and the red wire or blue wire and black wire from the solenoid terminals.

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

If continuity is present as described, reconnect the 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 dispenser to the power source. Listen carefully in the vicinity of the solenoid valve for a "clicking" sound as the coil magnet attracts.

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 wires from the solenoid valve.

2.Turn off the water supply to the dispenser.

3.Disconnect the water inlet line from the connector on the solenoid valve.

4.Remove the #10-32 screw and the flat washer securing the liquid level board, shield and the solenoid to the component bracket.

5.Remove solenoid, connectors, air chamber and tank inlet tube as an assembly.

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Bunn U3A service manual Solenoid
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U3A, U3 specifications

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