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Page 17
SERVICE (cont.)
DILUTION SOLENOID VALVE
FIG. 10 DILUTION SOLENOID VALVE
FIG. 11 SOLENOID VALVE TERMINALS
P1799
4
2
3
1
MINUTES
MINUTES
B
UNN-O-MATIC
P
/
N
05791-0006 120 VAC
5
3
6
4
7
5
6
6
7
8
P2146.35
Location:
The dilution solenoid valve is located behind the
upper rear access panel on the right side of the bracket,
when looking at it from the rear of the brewer.
Test Procedures:
1. Disconnect the brewer from the power source.
2. Place Dilution switch in "DILUTION" position.
3. Disconnect the white/blue and white/green wires
from the solenoid valve. With the ON/OFF switch
in the "ON" position press the start switch.
4. With a voltmeter, check the voltage across the
white/blue and white/green wires. Connect the
brewer to the power source. The indication must
be:
a) 120 volts ac for 2-wire 120 volt models.
b) 120 volts ac for 3-wire 120/208 and 120/240
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 brewer wiring harness.
5. Check for continuity across the solenoid valve
coil terminals.
If continuity is present as described, reconnect the
white/blue wire from the dilution switch and white/
green wire from the brew solenoid terminal.
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 ON/OFF
switch in the "ON" position press start switch
and listen carefully in the vicinity of the solenoid
valve for a "clicking" sound 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 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 solenoid valve.
2. Turn off the water supply to the brewer.
3. Disconnect the water lines to and from the
solenoid valve.
4. Remove the two #10-32 slotted-head screws
holding the solenoid valve to the bracket.
5. Securely install the new solenoid valve to the
bracket.
6. Securely fasten the water lines to and from the
solenoid valve.
7. Refer to FIG. 11 when reconnecting the wires.
WHI/BLU to
Dilution Switch
WHI/GRN to
Brew Solenoid
Valve