Bunn FMD-3 用户指南
34
SOLENOID VALVE (COLD WATER - OPTIONAL)
FIG. 29 COLD WATER SOLENOID VALVE
P1637.40
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 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/yellow wires to the solenoid.
If continuity is not present as described, replace the
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 “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.
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 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
If the sound is not heard as described, replace the
solenoid valve.
Removal and Replacement:
1. Loosen the two screws securing the component
bracket to the dispenser base. Lift the component
bracket off of the base and move to the right.
2. Remove the white and white/yellow wires from the
solenoid valve.
3. Turn off the water supply to the dispenser.
4. Disconnect the water lines to and from the solenoid
valve.
5. Loosen the two #8-32 screws and washers secur-
ing the solenoid mounting bracket to the base.
Remove solenoid bracket and solenoid valve as an
assembly.
6. Remove the two #10-32 screws and lockwash-
ers securing the solenoid valve to the solenoid
bracket.
7. Using two #10-32 screws and lockwashers in-
stall new solenoid valve on solenoid mounting
bracket.
8. Install the solenoid valve and bracket on the dis-
penser base and tighten the two #8-32 screws.
9. Securely fasten the water lines to and from the
solenoid valve.
10. Refer to Fig. 30 when reconnecting the wires.
SERVICE (cont.)
29170 090407
P1215
WHI/YEL to Hot/
Cold Switch
WHI to Main Wiring
Harness
FIG. 30 COLD WATER SOLENOID TERMINALS