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17
Solenoid Valve
Location:
The solenoid valve is located within the side of the dis-
penser on the right side near the bottom.
To test the solenoid valve, access will also be needed
to the electronic control assembly.
BUNN
90 psig max operating pressure
Strainer/Flow Control # 22300.0750
(Repl. Flow Washer #20526.0750)
(Repl. Screen #23721.0000)
.750 gpm FLOW
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HAZARDOUS
VOLTAGE
DISCONNECT FROM
POWER SOURCE
BEFORE REMOVING!
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P1994
FIG. 9 SOLENOID VALVE
SERVICE (cont.)
Test Procedure:
1. Disconnect the dispenser from the power source
and turn off the water supply to the dispenser.
2. Remove the pink wire from terminal 5 of the elec-
tronic control assembly.
3. Check the voltage across the solenoid valve coil
terminals with a voltmeter. Connect the dispenser
to the power source. The indication must be 200
to 240 volts ac for 200 to 240 volt models after a
delay of approximately 5 seconds.
4. Disconnect the dispenser from the power source.
If voltage was present as described, proceed to #5.
If voltage was not present as described, refer to the
Wiring Diagrams and check the dispenser wiring har-
ness.
5. Remove both wires from the solenoid valve coil
terminals.
6. Check for continuity across the solenoid valve coil
terminals.
If continuity is present as described, reconnect the
wires and proceed to #7.
If continuity is not present as described, replace the
solenoid valve coil.
7. Check the solenoid valve for coil action. Connect
the dispenser to the power source. Listen carefully
in the vicinity of the solenoid valve for a “clicking”
sound after approximately 5 seconds, as the coil
magnet attracts the plunger.
8. Disconnect the dispenser from the power source.
9. Reconnect the pink wire to terminal 5 of the elec-
tronic control assembly.
If the sound was 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 was not heard as described, replace the
solenoid valve.
Removal and Replacement:
1. Remove all wires from the solenoid valve coil.
2. Turn off the water supply to the dispenser.
3. Disconnect the water lines to and from the sole-
noid valve.
4. Remove the two 8-32 slotted-head screws holding
the solenoid valve and mounting bracket to the
component bracket.
10889 091599