Bunn C Series Service & Repair Manual page 14

SERVICE (cont.)
SOLENOID VALVES
EARLY MODELS
FIG. 14-1 SOLENOID VALVE
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 and black 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 and black wires
with a voltmeter. Connect the brewer to the 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 240 volts ac for two wire 200 or 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
Diagrams and check brewer wiring harness.
5. Check for resistance across the solenoid valve coil
terminals.
If resistance is present as described, reconnect the
white and black wire from the timer.
If resistance is not present as described, replace the
solenoid valve.
LATE MODELS
Page 14
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 and black from the solenoid
valve.
2. Turn off the water supply to the brewer.
3. Disconnect the water lines to and from the solenoid
valve.
4. Remove the two #8-32 screws securing the sole-
noid 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 Fig. 9 when reconnecting the wires.
FIG. 14-2 SOLENOID VALVE TERMINALS
WHI from Timer
BLK from Timer
41711.1 052009