Solenoid (Dispense) - Bunn FMD-3 Operating & Service Manual

SERVICE (cont.)
SOLENOID VALVES (DISPENSE)
FIG. 31 DISPENSE SOLENOID VALVES
Location:
The dispense solenoids are located on the upper
left side of the tank.
Test Procedures:
1. Disconnect the dispenser from the power source.
2. Disconnect the white and white/violet, orange or
tan wires from the solenoid valve. With the "RUN/
RINSE" switch in the "RINSE" (upper) position
press the appropriate dispense switch on front of
the door.
3. With a voltmeter, check the voltage across the white
and white/violet, orange or tan 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 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 dispenser wiring harness.
5. Check for continuity across the solenoid valve coil
terminals.
If continuity is present as described, reconnect the
white and white/violet, orange or tan 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
dispenser to the power source. With "RUN/RINSE"
switch in the "RINSE" (upper) position press the
appropriate dispense switch and listen carefully in
the vicinity of the solenoid valve for a "clicking"
sound as the coil magnet attracts.
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 block-
age in the tank water outlet 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:
P1637.40
1. Remove the white and white/violet,orange or tan
wires from the solenoid valve.
2. Turn off the water supply to the dispenser.
3. Drain enough water from the tank (approximately
1.0 gallon) so the water level is below the dispense
valve mounting hole.
4. Disconnect the water line from the solenoid
valve.
5. Remove the #10-32 screw securing the solenoid
valve to side of the tank. Remove solenoid valve.
6. Using the #10-32 screw install new solenoid valve
on side of the tank
7. Push the water line onto the tube on bottom of
solenoid valve.
8. Refer to Fig. 32 when reconnecting the wires.
TAN to Main Harness
WHI to Main
Harness
ORN to Main
Harness
WHI to Main
Harness
WHI/VIO to Main
Harness
WHI to Main
Harness
FIG. 32 DISPENSE SOLENOID VALVE
35
LEFT
CENTER
TERMINALS
RIGHT
P1645
29170 090407