Solenoid (Cold Water - Optional) - Bunn FMD-4 Operating & Service Manual

SERVICE (cont.)
SOLENOID VALVE (COLD WATER - OPTIONAL)
FIG. 29 COLD WATER SOLENOID VALVE
Location:
The cold water solenoid valve is located on the left
side of the dispenser base just behind the component
bracket.
Test Procedures:
1. Disconnect the dispenser from the power
source.
2. Disconnect the white and white/yellow wires from
the solenoid valve. With the "HOT/COLD" switch
in the "COLD" (upper) position press the left
dispense switch on front of the door.
3. With a voltmeter, check the voltage across the white
and white/yellow wires. Connect the dispenser to
the power source. The indication must be:
a) 120 volts ac for two wire 120 volt models, three
wire 120/208 volt, and 120/240 volt models.
b) 240 volts ac for two wire 240 volt models.
c) 230 volts ac for two wire 230 volt models.
4. Disconnect the dispenser
source.
If voltage is present as described, proceed to #5
If voltage is not present as described, refer to Wiring
Diagrams and check dispenser wiring harness.
5. Check for continuity across the solenoid valve coil
terminals.
If continuity is present as described, reconnect the
white and white/yellow wires to the solenoid.
If continuity is not present as described, replace the
solenoid valve.
6. Check the solenoid valve for coil action. Connect the
7. Disconnect the dispenser from the power source.
If the sound is heard as described and water will not pass
through the solenoid valve, there may be a blockage 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 so-
P2635
lenoid valve.
Removal and Replacement:
1. Loosen the two screws securing the component
2. Remove the white and white/yellow wires from the
3. Turn off the water supply to the dispenser.
4. Disconnect the water lines to and from the solenoid
5. Loosen the two #8-32 screws and washers securing
6. Remove the two #10-32 screws and lockwashers se-
7. Using two #10-32 screws and lockwashers install
8. Install the solenoid valve and bracket on the dis-
9. Securely fasten the water lines to and from the so-
from the power
10. Refer to Fig. 30 when reconnecting the wires.
34
dispenser to the power source. With "HOT/COLD"
switch in the "COLD" (upper) position press the left
dispense switch and listen carefully in the vicinity of
the solenoid valve for a "clicking" sound as the coil
magnet attracts.
bracket to the dispenser base. Lift the component
bracket off of the base and move to the right.
solenoid valve.
valve.
the solenoid mounting bracket to the base. Remove
solenoid bracket and solenoid valve as an assem-
bly.
curing the solenoid valve to the solenoid bracket.
new solenoid valve on solenoid mounting bracket.
penser base and tighten the two #8-32 screws.
lenoid valve.
FIG. 30 COLD WATER SOLENOID TERMINALS
WHI/YEL to Hot/
Cold Switch
WHI to Main Wiring
Harness
P1215
35135 100407