Bunn FMD-4, Operating & Service Manual

Page: 35 / 46

35
SOLENOID VALVE (DISPENSE) - FMD-4 & FMD-5
FIG. 31 DISPENSE SOLENOID VALVE
Location:
The dispense solenoid is located on the upper left
center of the tank.
Test Procedures:
1. Disconnect the dispenser from the power
source.
2. Disconnect the two wires from the solenoid valve
that is being tested. With the “RINSE/RUN” switch
in the “RINSE” upper position press the dispense
switch on front of the door.
3. Check the voltage across the two wires with a
voltmeter. 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
diagram and check dispenser wiring harness.
5. Check for continuity across the solenoid valve
coil terminals.
If continuity is present as described, reconnect the
wires to the solenoid (see Fig. 32), proceed to #6
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 “RINSE/RUN”
switch in the “RINSE” upper position press the
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 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.
P2635
SERVICE (cont.)
35135 100407