Bunn OL, Operating & Service Manual

Page: 114 / 176

Page 22
FIG. 21 SOLENOID VALVE
FIG. 22 SOLENOID VALVE WIRING
SERVICE (cont.)
Solenoid Valve
4. Check the solenoid valve for coil action. Connect
the brewer to the power source, place the On/Off
brew station warmer switch in the upper posi-
tion, press and release the start switch. Listen
carefully in the vicinity of the solenoid valve for a
“clicking” sound as the coil magnet attracts and
after the approximate setting on the brew timer
dial, repels the plunger.
5. Disconnect the brewer 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 or after 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 all wires from the solenoid valve coil.
2. Turn off the water supply to the brewer.
3. Remove the bottom pan attached with one or
more 8-32 slotted-head screw(s) beneath the
front of the brewer.
4. Raise the brewer approximately six inches from
the counter top and support the feet on something
sturdy.
5. Disconnect the water lines to and from the sole-
noid valve.
6. Remove the two 10-32 screws holding the sole-
noid valve to the bracket.
7. Lift-out the solenoid valve.
8. Securely install the new solenoid valve to the
bracket. Check the direction of flow arrow on
the valve. It must be pointing toward the flow
control.
9. Securely fasten the water lines to and from the
solenoid valve.
10. Refer to FIG. 22 when reconnecting the wires.
Location:
The solenoid valve is located below and to the left of
the tank as viewed from the rear, FIG. 21.
Test Procedure:
1. Check the voltage across the white and black
wires with a voltmeter when the On/Off brew sta-
tion warmer switch is in the upper position and
the start switch is pressed to the lower position
and released. Connect the brewer to the power
source. The indication must be:
a) 120 volts ac for two wire 120 volt models and
three wire 120/240 volt models,
b) 200 or 240 volts ac for two wire 200 volt or
240 volt models,
c) 100 volts ac for two wire 100 volt models,
for the approximate setting on the brew timer dial
and then return to zero.
2. Disconnect the brewer from the power source.
If voltage is present as described, proceed to #3.
If voltage is not present as described, refer to the Wir-
ing Diagrams and check the brewer wiring harness.
3. Check for continuity across the solenoid valve
coil terminals.
If continuity is present as described, reconnect the
white and black wires and proceed to #4.
If continuity is not present as described, replace the
solenoid valve.
BLK to Brew Timer
WHI to Brew Timer
P1699
P1588
32440 070700
Part II