Solenoid Valve - Bunn H5M Operating & Service Manual

SERVICE (cont.)

Solenoid Valve

Location:
The solenoid valve is located inside the rear of the
dispenser on the right side near the bottom.
FIG. 5 SOLENOID VALVE
Test Procedure:
1. Disconnect the dispenser from the power source
and turn-off the water supply to the dispenser.
2. Check the voltage across the solenoid valve coil
terminals with a voltmeter. Connect the dispenser
to the power source. The indication must be:
a.) 100 to 120 volts ac for 100 to 120 volt mod-
els,
b.) 200 to 240 volts ac for 200 to 240 volt mod-
els,
c.) 230 volts ac for 230 volt models,
after a delay of approximately 5 seconds.
3. Disconnect the dispenser from the power
source.
If voltage was present as described, proceed to #4.
If voltage was not present as described, refer to the
Wiring Diagrams and check the dispenser wiring har-
ness.
4. Remove both wires from the solenoid valve coil
terminals.
5. Check for continuity across the solenoid valve coil
terminals.
If continuity is present as described, reconnect the
wires and proceed to #6.
If continuity is not present as described, replace the
solenoid valve coil.
6. 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.
7. Disconnect the dispenser from the power source.
If the sound was heard as described and water will
not pass through the solenoid valve, there may be a
blockage 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.
P1778
2. Turn-off the water supply to the dispenser.
3. Disconnect the water lines to and from the solenoid
valve.
4. Remove the two 8-32 slotted-head screws holding
the solenoid valve and mounting bracket to the
component bracket.
5. Lift-out the solenoid valve.
6. Remove the two 10-32 slotted-head screws holding
the solenoid valve to its mounting bracket.
7. Securely install the new solenoid valve to its mount-
ing bracket. The direction of flow arrow must be
pointing towards the tank lid.
8. Attach the solenoid valve and mounting bracket to
the component bracket.
9. Securely fasten the water lines to and from the
solenoid valve.
10. Reconnect the wires, FIG. 6.
FIG. 6 SOLENOID VALVE WIRING
12
BLU to Liquid Level #2
WHI or RED to Terminal Block
10267 011599
P1779