Bunn twf-ez service manual Dilution Solenoid Valve, SERVICE cont

SERVICE (cont.)

DILUTION SOLENOID VALVE

P1960.60

FIG. 6 DILUTION SOLENOID VALVE

Location:

Viewing the brewer from the rear the dilution so- lenoid is mounted on the right side of the solenoid mounting bracket.

Test Procedure:

1.Disconnect the brewer from the power source.

2.Disconnect the white/blue and white wires from the iced tea brew and dilution solenoid valves. With the TEA/OFF/COFFEE switch in the "TEA" position press the start switch.

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

4.Disconnect the brewer from the power supply.

If voltage is present as described, proceed to #5.

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

6.Check the solenoid valve for coil action. Connect the brewer to the power source, place the TEA/ OFF/COFFEE switch in the "TEA" position and mo- mentarily place the start switch in the lower posi- tion and release. 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 or after 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 the solenoid valves.

2.Turn off the water 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 mounting bracket to the trunk base.

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 trunk base.

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

10.Refer to Fig. 7 when reconnecting the wires.

WHI to Main

Harness

5.Remove both wires from the coil and check for continuity across the coil terminals.

If continuity is present as described, reconnect the white/blue and white wires and proceed to #6.

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

WHI/RED to Switch

HOT COFFEE

BREW SOLENOID

WHI/BLU	ICED TEA BREW
	SOLENOID
to Switch	DILUTION
	SOLENOID

FIG.7 SOLENOID VALVE TERMINALS

P1364

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