Bunn FMD-4 User Manual

47

FIG. 45 DISPENSE SOLENOID VALVE 

TERMINALS

P1645

FIG. 44 DISPENSE SOLENOID VALVES

P1637.40

Location:

  The dispense solenoids are located on the side of 

the tank.

Test Procedures:

1.   Disconnect the dispenser from the power source.

2.  Disconnect the two wires from the solenoid valve. 

With the “RUN/RINSE” switch in the “RINSE” (up-

per) position press the appropriate dispense switch 

on front of the door.

3.  With a voltmeter, check the voltage across the two 

wires. Connect the dispenser to the power source. 

The indication must be:

 

a) 120 volts ac for two wire 120 volt models, three 

wire 120/208 volt, and 120/240 volt models.

 

b) 240 volts ac for two wire 240 volt models.

 

c) 230 volts ac for two wire 230 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 Wiring 

Diagrams and check dispenser wiring harness.

5.  Check for continuity across the solenoid valve coil 

terminals.

If continuity is present as described, reconnect the two 

wires to the solenoid.

If continuity is not present as described, replace the 

solenoid valve.

6.  Check the solenoid valve for coil action. Connect the 

dispenser to the power source. With “RUN/RINSE” 

switch in the “RINSE” (upper) position press the 

appropriate dispense switch and listen carefully in 

the vicinity of the solenoid valve for a “clicking” 

sound  as the coil magnet attracts.

7.  Disconnect the dispenser from the power source.

If the sound is heard as described and water will not 

pass through the solenoid valve, there may be a block-

age in the tank water outlet 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 the two wires from the solenoid valve.

2.  Turn off the water supply to the dispenser.

3.  Drain enough water from the tank (approximately 

1.0 gallon) so the water level is below the dispense 

valve mounting hole.

4.  Disconnect the water line from the solenoid 

valve.

5.  Remove the  #10-32 screw securing the solenoid 

valve to side of the tank. Remove solenoid valve. 

6.  Using the  #10-32 screw install new solenoid valve 

on side of the tank

7.  Push the water line onto the tube on bottom of 

solenoid valve.

8.  Refer to schematic wiring diagrams when recon-

necting the wires.

to Dispense Switch

to Control Board

42672 122209