Bunn FMD-3, Operating & Service Manual

36

SERVICE (cont.)

SOLENOID VALVE (INLET)

FIG. 33 INLET SOLENOID VALVE

P1445.40

Location:
 

The inlet solenoid is located inside  on the left rear 

of the dispenser housing.

Test Procedures:

1.   Disconnect  the  dispenser    from  the  power 

source.

2.  Disconnect  the  white  and  violet  wires  from  the 

solenoid valve. 

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

and violet 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 the 

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 

white and violet wires to the solenoid.

If continuity is not present as described, replace the 

solenoid valve.

29170 090407

6.  Check the solenoid valve for coil action. Connect 

the dispenser to the power source.  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 water line 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 white and violet wires from the sole-

noid valve.

2.  Turn off the water supply to the dispenser.

3.  Disconnect the water lines to and from the solenoid 

valve.

4.  Loosen the two #8-32 screws securing the solenoid 

to the rear dispenser housing. Remove solenoid.

5.  Remove the two #8-32 U-Type fasteners from the 

solenoid bracket.

6.  Install the two #8-32 U-Type fasteners and the two 

#8-32 screws on the new solenoid. 

7.  Install  new  solenoid  valve  on  rear  of  dispenser 

housing and tighten the two screws.

8.  Securely  fasten  the  water  lines  to  and  from  the 

solenoid valve.

9.  Refer to Fig. 34 when reconnecting the wires.

P1217

FIG. 34 INLET SOLENOID VALVE TERMINALS

WHI to Main

Harness

VIO to Control

Board J4-2