Bunn FMD-4 User Manual

49

FIG. 48 INLET SOLENOID VALVE

Location:
  The inlet solenoid is located inside on the rear of 

the dispenser base.

Test Procedures:

1.  Disconnect the dispenser  from the power 

source.

2.  Disconnect the two wires from the solenoid 

valve. 

3.  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.

4.  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.

5.  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 two wires from the solenoid valve.

2.  Turn off the water supply to the dispenser.

3.  Disconnect the water lines to and from the solenoid 

valve.

4.  Remove the two #8-32 screws securing the sole-

noid to the dispenser base. Remove solenoid.

5.  Install new solenoid valve on the dispenser base 

and secure with the two #8-32 screws.

6.  Securely fasten the water lines to and from the 

solenoid valve.

7.  Refer to Schematic Wiring Diagrams when recon-

necting the wires.

P1217

FIG. 49 INLET SOLENOID VALVE TERMINALS

Late Models

Early Models

120V  1.2 kΩ

230V  3.84 kΩ

120V  622 Ω

230V  1555 Ω

P4102.40

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