Bunn TU5Q Manual De Propietario

Page 15

SERVICE (cont.)
BREW SOLENOID VALVE

FIG. 4 BREW SOLENOID VALVE

Location:

The brew solenoid is located inside the upper rear

access panel, on the left side of the bracket when

looking at it from the rear 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 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 2-wire 120 volt models.

b) 120 volts ac for 3-wire 120/208 and 120/240

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

Diagram 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.

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" 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 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 #10-32 slotted-head screws hold-

ing the solenoid valve to the bracket.

5. Securely install the new solenoid valve to the

bracket.

6. Securely fasten the water lines to and from the

solenoid valve.

7. Refer to the Fig. 5 when reconnecting the wires.

FIG. 5 SOLENOID VALVE TERMINALS

P1799

WHI/GRN to

Brew Timer TL4

WHI/GRN to

Dilution Solenoid

WHI/VIO to

Brew Timer TL1

10777 041500

MINUT

MINUTE

NN-O-MATI

P/N 05791-0006 120 V

P2146.35