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Bunn DV User Manual

Page 10

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10

Electronic Controls (cont.)

7. Reconnect the pink wire to terminal 5 of the elec-

tronic control assembly.

8. Loosen the compression fi tting, remove the probe

from the tank lid, and inspect it for mineral depos-
its. Replace it if necessary. Keep the exposed ends
of the probe away from any metal surface of the
dispenser.

9. Check the voltage across terminals 1 & 4 of the elec-

tronic control assembly with a voltmeter. Connect
the dispenser to the power source. The indication
must be:

a.) 100 to 120 volts ac for 100 to 120 volt models
or

b.) 200 to 240 volts ac for 200 to 240 volt models

or

c.) 230 volts ac for 230 volt models after a delay
of approximately 5 seconds.

10. Touch the screw head end of the probe to the dis-

penser housing. The indication must be 0.

11. Move the probe away from the dispenser housing.

The indication must again be:

a.) 100 to 120 volts ac for 100 to 120 volt models
or

b.) 200 to 240 volts ac for 200 to 240 volt models
or

c.) 230 volts ac for 230 volt models

after a delay of approximately 5 seconds.

12. Disconnect the dispenser from the power source.

Temperature Control Flow Charts (cont.)

If voltage was present as described, reinstall the probe,
the sensing function of the system is operating properly.

If voltage was not present as described, check the pink
probe wire and the green ground wire for continuity
and/or replace the probe.

Temperature Control Test Procedure

1. Disconnect the dispenser from the power source.
2. Check the voltage across terminals 3 & 4 of the

electronic control circuit board with a voltmeter.
Connect the dispenser to the power source.The
indication must be:

a.) 100 to 120 volts ac for 100 to 120 volt models
or

b.) 200 to 240 volts ac for 200 to 240 volt models

or

c.) 230 volts ac for 230 volt models.

3. Disconnect the dispenser from the power source.
4. Check the voltage across the tank heater terminals

with a voltmeter. Connect the dispenser to the
power source. The indication must be:

a.) 100 to 120 volts ac for 100 to 120 volt models
or

b.) 200 to 240 volts ac for 200 to 240 volt models

or

c.) 230 volts ac for 230 volt models.

5. Disconnect the dispenser from the power source.

Still Boiling

?

Red Light On While

Boiling

?

Retry

Drain cup

Retry

Disconnect Blue Wire From

Control Board Pin 7

No

Yes

Yes

Yes

No

No

H5X THERMOSTAT

PROBLEM: Boils Excessively - Fills Cup

Still Boiling

?

Replace Steam Sensor

Replace Triac Assembly

Check For Split

Tank Heater

Replace Control Board

Finished

Replace Control Assembly

Still Boiling

?

Red Light On While

Boiling

?

Retry

Drain cup

Retry

Disconnect Blue Wire From

Control Board Pin 7

No

Yes

Yes

No

H5E THERMOSTAT

PROBLEM: Boils

Replace Triac Assembly

Check For Split

Tank Heater

Replace Control Board

Replace Control Assembly

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