Bunn Beverage Dispenser FMD-5 Manual De Usuario

21

CONTROL BOARD (CONT.)
11. 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.

12. Move the probe’s flat end to the dispenser housing. 

The indication must be 0.

13. Move the probe’s flat end 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.

14. Disconnect the dispenser from the power source.

If the voltage is present as described, re-install the 

probe. The liquid level control circuitry is operating  

properly.

If the voltage is not present as described, check the 

pink probe wire and green tank wire for continuity and 

check the overflow protection switch.

Hopper Motor Control Circuitry:

1.  Disconnect the dispenser from the power source.

2.  With the voltmeter, back probe check the voltage 

across pins 1 & 2 of  the eight pin J1 connector on 

the wiring harness. Connect the dispenser to the 

power source. The indication must be 24 volts ac 

from the transformer.

3.   Disconnect the dispenser from the power source.

If voltage is present as described, proceed to step 4.

If voltage is not present as described, refer to the wiring 

diagram and check the dispenser wiring harness.

4.   Check that the “Rinse/Run” switch is in the “Run” 

position.

5.   With a voltmeter check the voltage across the red 

(+) terminal  and the black (-) terminal of the auger 

motor. Connect the dispenser to the power source. 

Press the appropriate dispense switch.  After a 

delay of about .6 seconds, the indication must be 

between +4.0 and +24.5 volts dc.

If the voltage is present as described, the hopper motor 

control circuitry is operating  properly.

If the voltage is not present as described, replace the 

control circuit board.

Whipper Motor and Dispense Solenoid Circuitry:

1.   Disconnect the dispenser from the power source.

2.  With a voltmeter, back probe check the voltage 

across pins 1 & 2 of  the eight pin J1 connector 

on the wiring harness. Connect the dispenser to 

the power source. The indication must be 24 volts 

ac.

3.   Disconnect the dispenser from the power source.

If voltage is present as described, proceed to step 4.

If voltage is not present as described, refer to the wiring 

diagram and check the dispenser wiring harness. 

4.   Check that the  RINSE/RUN switch is in the “Rinse” 

position.

5.  With a voltmeter, back probe check the voltage 

across pins 2 & 4 of  the six pin J2 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 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.

6.   Disconnect the dispenser from the power source.

7. With a voltmeter check the voltage across the 

terminals of the appropriate dispense solenoid. 

Connect the dispenser to the power source. Press 

the appropriate dispense switch. 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.

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