Solenoid - Bunn Dual Operating & Service Manual

SERVICE (cont.)
SOLENOID VALVE (Inlet)
FIG. 26 SOLENOID VALVE
Location:
The solenoid valve is located inside the lower right
front of the brewer.
Test Procedure:
1. Disconnect the brewer from the power source.
2. Remove both wires from the solenoid valve coil
terminals.
3. With a voltmeter, check the voltage across the
removed wires:
a.) Violet and white on 120/208 volt and 120/240
volt three wire electro/mechanical models.
b.) Violet and red on 200 volt and 240 volt electro/
mechanical models.
c.) White/blue and white on 120/208 volt and 120/
240 volt electronic models.
d.) White/blue and red on 200 volt and 240 volt
electronic models.
Connect the brewer to the power source. The
indication must be:
a.) 120 volts ac for 120/208V and 120/240V three
wire models.
b.) 200 to 240 volts ac for 200V or 240V two wire
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 the
Wiring Diagrams and check brewer wiring harness.
5. Check for continuity across the solenoid valve coil
terminals.
If continuity is present as described, reconnect the
A R T
S T
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1 1⁄2
l
1 ga
l
1⁄2 ga
T
A R
S T
R
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O N
O R
C T
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A D Y
R E
ER
AT
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P796
wires and proceed to #6.
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. Listen carefully in
the vicinity of the solenoid valve for a "clicking"
sound after approximately 1 second, as the coil
magnet attracts.
7. 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
blockage 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. Disconnect the water lines to and from the sole-
noid valve.
4. Remove the two #8-32 slotted head screws hold-
ing the solenoid valve and mounting bracket to the
brewer trunk.
5. Lift out the solenoid valve.
6. Remove the two #10-32 slotted head screws hold-
ing the solenoid valve to the mounting bracket.
7. Securely install the new solenoid valve to its mount-
ing bracket.
8. Attach the solenoid valve and mounting bracket to
the brewer trunk.
9. Securely fasten the water lines to and from the
solenoid valve.
10. Refer to Fig. 27 when reconnecting the wires.
WHI to Level Control Board T3 (120/208V or 120/
240V Eletro/mechanical)
WHI to Terminal Block (120/208V or 120/240V
Electronic)
RED to Level Control Board T3 (200 or 240V
Electro/mechanical or Control Assy T4 Electronic)
VIO to Level Control Board T1 (Electro/
mechanical)
WHI/BLU to Control Assy #1 (Electronic)
FIG. 27 SOLENOID VALVE TERMINALS
Page 36
P799
27040 032201