Bunn TU5Q User Manual

Page 14

Page 14

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

MIN

UTES

MINUT

BUNN-O-MA

TIC

P/N 05791-0006 120 VAC

P2146.35