Bunn CWT Service Manual download pdf (Page 19)

Page 19

SERVICE (cont.)

SOLENOID VALVE - CT, CWT & SINGLE CW

Location:

The solenoid valve is located inside the trunk

on the lower center part of the component bracket.

Test Procedures:

1. Disconnect the brewer from the power source.

2. Disconnect the white/blue and white/green wires

from the solenoid valve. With the "ON/OFF"

switch in the "ON" upper position press the start

switch.

3. Check the voltage across the white/blue and white/

green wires with a voltmeter. Connect brewer to

power source. The indication must be:

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

three wire 120/240 volt models.

b) 200 to 230 volts ac for two wire 200 or 230

volt models.

4. Disconnect 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/blue and white/green wire from the timer.

If continuity is not present as described, replace the

solenoid valve.

6. Check the solenoid valve for coil action. Connect

the brewer to the power source. With "ON/OFF"

switch in the "ON' upper position 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 the white/blue and white/green from the

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 screws securing the

solenoid mounting bracket to the component

bracket. Remove solenoid bracket and solenoid

valve as an assembly.

5. Remove the two #10-32 screws and lockwash-

ers securing the solenoid valve to the solenoid

bracket.

6. Using two #10-32 screws and lockwashers in-

stall new solenoid valve on solenoid mounting

bracket.

7. Using two #8-32 screws install solenoid valve

and bracket to the component bracket.

8. Securely fasten the water lines to and from the

solenoid valve.

9. Refer to the illustration below when reconnecting

the wires.

P1132

P1153

10841 020503

WHI/BLU from Timer

WHI/GRN from Timer

FIG. 9 SOLENOID VALVE LOCATION

FIG. 10 SOLENOID VALVE WIRING

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 31 32

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Bunn CWT Service Manual Page 19

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