Bunn HC-2 HC-3 Coffeemaker User Manual


 
30
SERVICE (cont.)
SOLENOID VALVE (COLD WATER - OPTIONAL)
FIG. 25 COLD WATER SOLENOID VALVE
P1214.45
Location:
The cold water solenoid valve is located on
the left side of the dispenser base just behind the hop-
per delay board.
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. Check the voltage across the white and white/
yellow wires with a voltmeter. Connect the dis-
penser to the power source. The indication must
be 120 volts ac for two wire 120 volt models,
three wire 120/208, 120/240 volt models and 240
volts ac for two wire 240 volt models.
4. Disconnect the brewer 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
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 brewer to the power source. With "HOT/COLD"
switch in the "COLD" upper position press the left
dispense switch and listen carefully in the vicin-
ity 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
solenoid valve.
Removal and Replacement:
1. Remove the white and white/yellow wires from
the solenoid valve.
2. Turn-off the water supply to the dispenser.
3. Disconnect the water lines to and from the sole-
noid valve.
4. Remove the two #8-32 keps nuts and washers
securing the solenoid mounting bracket to the
base. Remove solenoid bracket and solenoid
valve as an assembly.
5. Remove the two #10-32 screws and lockwashers
securing the solenoid valve to the solenoid
bracket.
6. Using two #10-32 screws and lockwashers in-
stall new solenoid valve on solenoid mounting
bracket.
7. Using two #8-32 keps nuts and washers install
solenoid valve and bracket to the base of the dis-
penser.
8. Securely fasten the water lines to and from the
solenoid valve.
9. Refer to Fig. 26 when reconnecting the wires.
27591 031597