Level Control Board And Level Probe - Bunn HC-2 HC-3 Operating & Service Manual

SERVICE (cont.)

LEVEL CONTROL BOARD AND LEVEL PROBE

FIG. 17 LEVEL CONTROL BOARD AND PROBE
Location:
The level control board is located on the upper
right rear of the front panel just in front of the tank.
The Level probe is located on the right center of the
tank lid.
Test Procedure:
1. Disconnect the dispenser from the power source.
2. Remove the violet wire from terminal 1 & pink wire
from terminal 4 of the circuit board.
3. Check the voltage across terminals 2 & 3 with a
voltmeter. Connect the dispenser to the power
source. The indication must be 120 volts ac for
two wire 120 volt models, three wire 120/208 volt
models, three wire 120/240 volt models and 240
volts ac for two wire 240 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 the
wiring diagram and check the dispenser wiring haness.
5. Reconnect the violet wire to terminal 1.
6. Carefully connect a piece of insulated jumper wire
to terminal 4. Keep the other end of this wire away
from any metal surface of the dispenser.
7. Check the voltage across terminals 1 & 3 with a
voltmeter. Connect the dispenser to the power
source. The indication must be 120 volts ac for two
wire 120 volt models, three wire 120/208 volt
models, three wire 120/240 volt models and 240
volts ac for two wire 240 volt models after a delay
of approximately 5 seconds.
8. Touch the free end of jumper wire to the dispenser
housing. The indication must be 0.
9. Move the jumper wire away from the dispenser
housing. The indication must again be 120 volts ac
for two wire 120 volt models, three wire 120/208
volt models , three wire 120/240 volt models and
240 volts ac for two wire 240 volt models after a
delay of approximately 5 seconds.
10. Disconnect the dispenser from the power source
and remove the jumper wire from terminal 4.
If voltage is present as described, the level control
board is operating properly, proceed to #11.
If voltage is not present as described, replace the level
control board.
P1203.45
11. Reconnect the pink wire to terminal 4.
12. Gently pull the probe out of the tank lid and inspect
for corrosion. Replace it if necessary.
13. Place the probe so that neither end is in contact
with any metal surface of the dispenser.
14. Check the voltage across terminals 1 & 3 with a
voltmeter. Connect the dispenser to the power
source. The indication must be 120 volts ac for two
wire 120 volt models, three wire 120/208 volt
models, three wire 120/240 volt models and 240
volts ac for two wire 240 volt models after a delay
of approximately 5 seconds.
15. Move the probe's flat end to the dispenser hous-
ing. The indication must be 0.
16. Move the probe's flat end away from the dispenser
housing. The indication should again be 120 volts
ac for two wire 120 volt models, three wire 120/
208 volt models, three wire 120/240 volt models
and 240 volt ac for two wire 240 volt models.
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