Bunn FMD-5 Solenoid Valve Cold Water Optional for FMD-2,-3,-4,-5, Cold Water Solenoid Terminals

Page 46

SERVICE (cont.)

SOLENOID VALVE (COLD WATER - OPTIONAL for FMD-2,-3,-4,-5)

FMD DBC-3 shown

P4102.40

FIG. 42 COLD WATER SOLENOID VALVE Location:

The cold water solenoid valve is located on the left side of the dispenser base just behind the component bracket.

Test Procedures:

1.Disconnect the dispenser from the power source.

2.With the “HOT/COLD” switch in the “COLD” (upper) position press any left dispense switch on front of the door.

3.With a voltmeter check the voltage across the white and white/yellow wires at the solenoid terminals. 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.

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 diagram and check dispenser wiring harness.

5.Disconnect the white and white/yellow wires from the solenoid.

6.Check for continuity across the solenoid valve coil terminals.

If continuity is present as described, reconnect the white and white/yellow wires to the solenoid.

If continuity is not present as described, replace the solenoid valve.

7.Check the solenoid valve for coil action. Connect the dispenser to the power source. With “HOT/COLD” switch in the “COLD” (upper) position press the left dispense switch and listen carefully in the vicinity of the solenoid valve for a “clicking” sound as the coil magnet attracts.

8.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.Loosen the two screws securing the component bracket to the dispenser base. Lift the component bracket off of the base and move to the right.

2.Remove the white and white/yellow wires from the solenoid valve.

3.Turn off the water supply to the dispenser.

4.Disconnect the water lines to and from the solenoid valve.

5.Loosen the two #8-32 screws and washers secur- ing the solenoid mounting bracket to the base. Remove solenoid bracket and solenoid valve as an assembly.

6.Remove the two #10-32 screws and lockwash- ers securing the solenoid valve to the solenoid bracket.

7.Using two #10-32 screws and lockwashers install new solenoid valve on solenoid mounting brack- et.

8.Install the solenoid valve and bracket on the dis- penser base and tighten the two #8-32 screws.

9.Securely fasten the water lines to and from the solenoid valve.

10.Refer to schematic wiring diagrams when recon- necting the wires.

P1215

FIG. 43 COLD WATER SOLENOID TERMINALS

46

42672 122209

 

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Contents FMD Series Phone 217 529-6601 FAX 217BUNN-O-MATIC Commercial Product Warranty Excluding regular maintenance itemsIntroduction Cleaning Required Regular Maintenance Problem Probable Cause Level Control Board and Probe FMD-1 ProblemProduct will not dispense RemedyProblem Probable Cause Remedy Troubleshooting Excess dust Fan Refer to Service Product overflows container Dispense SwitchInstall a regulator if necessary to Procedures. See42672 Component Access 20,23SERVICEcont Access PanelsTest Procedures Auger Motor Service Auger Drive Components all ModelsLocation Spacer Auger Motor Hopper Base Dust Seal Washer ServiceAuger Drive Components Retainer Clip Panel RED to Control BoardBushing Panel Auger Drive Shaft Remove auger drive shaft bushing from hopperRinse and dry each item thoroughly Locknut Auger Motor BracketAuxillary Control Board FMD DBC-3 only Service Auxillary Control Board Disconnect the dispenser from the power sourceService Ballast all ModelsTest Procedure Power Supply Control BoardCheck that the RINSE/RUN switch is in the Rinse position Hopper Motor Control CircuitryControl Board Using four #6-32 keps nutsConnectors on the control board Control board to the component bracketControl Board Check that the rinse/run switch is in the run posi- tion Control Board Connectors Location Remove temperature probe from the tankRemove bulb from the tank BLK to Main Control ThermostatWHI to Main If voltage is present as described, proceed to #6 Open the dispenser door and remove the bottom door coverIf voltage is present as described, proceed to #7 FMD DBC-3 Digital Touch Control Switch FMD DBC-2,DBC-3FMD DBC-2FD Digital Touch Control Switch ConnectorsEMI Filter 230 Volt FMD DBC-3 EMI FilterDisconnect the black and white wires from the fan terminals Test ProceduresVacuum FAN all Models Frother and Whipper Motor all Models except -2FD Frother and Whipper MotorFrother and Whipper Motor Will seat inside the whipper chamberHopper Drive Board FMD-1 only Hopper Drive BoardHopper Drive Board Terminals HOT/COLD Switch Optional for FMD DBC-3 Disconnect the wires from the switch terminalsTerminals Lamp Holder all Models Door Assy Upper Panel Lamp Holders Lower PanelLamp Starter and Socket Reconnect the violet wire to terminal Level Control Board and Level Probe FMD-1 onlyLevel Board Terminals Limit Thermostat all Models Limit ThermostatOverflow Protection Switch Rinse /RUN Switch all Models RINSE/RUN SwitchSolenoid Valve Cold Water Optional for FMD-2,-3,-4,-5 Cold Water Solenoid TerminalsSolenoid Valves Dispense all Models Dispense Solenoid Valves P1637.40 LocationHOT Water Dispense Solenoid Valve FMD-2FD,DBC-2FD,-3,DBC-3 Solenoid ValveSolenoid Valve Inlet all Models Inlet Solenoid ValveWHI or RED to Main BLK to Limit Wiring Harness Tank Heater all ModelsTank Heater Relay FMD-4,-5,120V Dispensers only BRN/BLK from WHI from Main HarnessTank Heater Switch all Models Tank Heater SwitchTransformer all Models Disconnected from the main wiring harnessRemove and discard the transformer Q5 & MOV4 Controls Right Whipper Motor Q1 & MOV1 Controls Left Whipper MotorQ2 & MOV3 Controls Center Whipper Motor Q7 & MOV2 Controls Refill ValveSchematic Wiring Diagram FMD-1 BLKSchematic Wiring Diagram FMD-1A WHI-16Schematic Wiring Diagram FMD-2 Schematic Wiring Diagram FMD-2A Schematic Wiring Diagram FMD DBC-2 Freeze Dried W/HOT Water Schematic Wiring Diagram FMD-2FD 42672 42672 42672 42672 Schematic Wiring Diagram FMD DBC-3 With HOT Water Dispense Schematic Wiring Diagram Fmda DBC-3 With HOT Water Dispense 42672 42672 42672 42672 Schematic Wiring Diagram FMD-5A
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