Bunn FMDA DBC-3 Mode D'Emploi

22

FIG. 9 CONTROL BOARD

Location:

The Control Board is located behind the lower

front  access cover mounted on the component bracket.

Test Procedure:
Liquid Level Control Circuitry:
1. Disconnect the dispenser from the power source.
2. Disconnect the eight pin connector from J1 of the

control board.

3. With a voltmeter check the voltage across pins 1 &

2 of  the eight  pin connector on the wiring harness.
Connect the dispenser to the power source. The
indication must be 24 volts ac.

4. Disconnect the dispenser from the power source.

If voltage is present as described, proceed to step 5.
If voltage is not present as described, refer to the
wiring diagram and check the dispenser wiring har-
ness.

5. Reconnect the eight pin connector of the wiring

harness to J1 of the control board.

6. Disconnect the six pin connector from J2 of the

control board.

7. With a voltmeter check the voltage across pins 2 &

4 of  the six pin connector on the wiring harness.
Connect the dispenser to the power source. The
indication must be:
a) 120 volts ac for two wire 120 volt models
b) 120 volts ac for  three wire 120/208 volt models
or  three wire 120/240 volt models
c) 240 volts ac for two wire 240 volt models.
d) 230 volts ac for two wire 230 volt models.

8. Disconnect the dispenser from the power source.

If voltage is present as described, proceed to step 9.
If voltage is not present as described, refer to the
wiring diagram and check the dispenser wiring har-
ness.

9. Reconnect  the six pin connector of the wiring

harness to J2 of the control board.

10. Disconnect the eight pin connector from J1 of the

control board.

11. Carefully connect a piece of insulated jumper wire

to pin 3 (third from left on top row) of J1 on the
control board. Keep the other end of this wire away
from any metal surfaces of the dispenser.

12. With a voltmeter check the voltage across the

terminals of the inlet solenoid valve. Connect the
dispenser to the power source. After a 10 second
delay, the indication must be :
a) 120 volts ac for two wire 120 volt models.
b) 120 volts ac for  three wire 120/208 or 120/240
volt models.
c) 240 volts ac for two wire 240 volt models.
d) 230 volts ac for two wire 230 volt models.

13. Touch the free end of the jumper wire to the

dispenser housing. The indication must be 0.

14. Move the jumper wire away from the housing.

After a 5 second delay, the indication must, again,
be:
a) 120 volts ac for two wire 120 volt models.
b) 120 volts ac for  three wire 120/208 or 120/240
volt models.
c) 240 volts ac for two wire 240 volt models.
d) 230 volts ac for two wire 230 volt models.

15. Disconnect the dispenser from the power source

and remove the jumper wire.

P1682.40

29215 052104