Bunn FMD-1, FMD-2 service manual Service

Page 20

SERVICE (cont.)

CONTROL BOARD - FMD-2 ONLY (CONT.)

6.Disconnect the four pin connector from J4 of the control board.

7.Check the voltage across pins 1 & 4 of the four pin connector on the wiring harness with a voltmeter. Connect the dispenser to the power source. The indication must be 120 volts ac for two wire 120 volt models, three wire 120/208 volt models, three wire 120/240 volt models.

8.Disconnect the dispenser from the power source.

If voltage is present as described, proceed to step 9. If voltage is not present as described, refer to the wiring diagram and check the dispenser wiring har- ness.

9.Reconnect the four pin connector of the wiring harness to J4 of the control board.

10.Disconnect the ten pin connector from J2 of the control board.

11.Carefully connect a piece of insulated jumper wire to pin 10 (top right) of J2 on the control board. Keep the other end of this wire away from any metal surfaces of the dispenser.

12.Check the voltage across the terminals of the inlet solenoid valve with a voltmeter. Connect the dis- penser to the power source. The indication must be 120 volts ac for two wire 120 volt models, three wire 120/208 volt models, three wire 120/240 volt models after a delay of approximately 10 seconds.

13.Touch the free end of the jumper wire to the dispenser housing. The indication must be 0.

14.Move the jumper wire away from the housing. The indication must, again, be 120 volts ac for two wire 120 volt models, three wire 120/208 volt models, three wire 120/240 volt models after a delay of approximately 5 seconds.

15.Disconnect the dispenser from the power source and remove the jumper wire.

If voltage is present as described, proceed to step 16. If the voltage is not present as described, replace the control circuit board.

16.Reconnect the ten pin connector of the wiring harness to J2 of the control board.

17.Gently pull the liquid level probe out of the tank lid and inspect for corrosion. Replace it if necessary.

18.Place the probe so that neither end is in contact with any metal surface of the dispenser.

19.Check the voltage across the terminals of the inlet solenoid valve with a voltmeter. Connect the dis- penser to the power source. The indication must be 120 volts ac for two wire 120 volt models, three wire 120/208 volt models, three wire 120/240 volt models after a delay of approximately 10 seconds.

20.Move the probe’s flat end to the dispenser hous- ing. The indication must be 0.

21.Move the probe’s flat end away from the housing. The indication must, again, be 120 volts ac for two wire 120 volt models, three wire 120/208 volt models, three wire 120/240 volt models after a delay of approximately 5 seconds.

22.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.

Hopper Motor Control Circuitry:

1.Disconnect the dispenser from the power source.

2.Disconnect the six pin connector from J3 of the control board.

3.Check the voltage across pins 5 & 6 of the six pin connector on the wiring harness with a voltmeter. Connect the dispenser to the power source. The indication must be 24 volts ac.

4.Disconnect the dispenser from the power source.

If voltage is present as described, proceed to step 5. If voltage is not present as described, refer to the wiring diagram and check the dispenser wiring har- ness.

5.Reconnect the six pin connector of the wiring harness to J3 of the control board.

6.Check that the rinse/run switch is in the run position.

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Contents BUNNFMD-1 FMD-2 Warranty IntroductionUser Notices FMD-1 FMD-228368.0001 00656.0000FMD-1 only Initial SET-UP Electrical RequirementsElectrical HOOK-UP Plumbing RequirementsRinse Timer FMD-2 only Initial Fill & HeatLiquid Level Control Running a Rinse SequenceCleaning AdjustmentsHopper Motor Speed Adjustment FMD-1 Cold Beverage SET-UP Optional FMD-2 onlyDraining the HOT Water Tank Troubleshooting ProblemProduct will not dispense Probable CauseProbable Cause Remedy Problem Probable Cause Stat for testing procedures. SeeFMD-1 SeeProblem Probable Cause Remedy Refer to Service Lamp, see page 28 for lamp replacement Dispenser is making unusualService Component AccessContents Auger Drive Components FMD-1Retainer Clip Hopper Assembly Hopper LidSpacer Auger Motor Hopper Base Dust Seal Washer Retainer Clip Ing panelAuger Drive Components FMD-2 Auger Drive Components FMD-1To the rear of the auger motor mounting panel Hopper Hopper Assy Remove auger motor and discard Disconnect the wires from the auger motor 16 to be removedRemove dust seal 17 from auger motor Ballast FMD-1 & FMD-2 LocationControl Board FMD-2 only Thermostat TerminalsService Dispense Switch Dispense Switchs FMD-1 & FMD-2 Dispense Switch Terminals P1449 FAN FMD-1 & FMD-2FMD-2 Frother and Whipper Motor FMD-1 shown & FMD-2 Whipper Motor Terminals P1221Hopper Drive Board FMD-1 only Hopper Drive BoardHopper Drive Board FMD-1 only Hopper Drive Board TerminalsLamp Replacement Refer to Fig Door Assy Upper Panel Lamp Holders Lower PanelLamp Replacement Refer to As assemblyLamp Starter and Socket Refer to Location Level Control Board and Level Probe FMD-1 onlyReconnect the violet wire to terminal Level Control Board and Level Probe FMD-1 onlyRINSE/RUN Switch FMD-1 LocationBLK from Main Harness WHI/BRN to YEL to Control Board J2-3 RINSE/RUN Switch FMD-2WHI/RED to Solenoid Valve Cold Water OPTIONALFMD-2 only Cold Water Solenoid ValveFMD-1 Solenoid Valve Dispense FMD-1 & FMD-2 Solenoid Valve Inlet FMD-1 & FMD-2 Tank HeaterTank Heater FMD-1 shown & FMD-2 Main Harness ThermostatTransformer FMD-2 only WHI/GRN T7 WHI/BLK T12Schematic Wiring Diagram FMD-1 Single PhaseSchematic Wiring Diagram FMD-2
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FMD-2, FMD-1 specifications

The Bunn FMD-2 is an advanced coffee dispensing machine designed for high-traffic environments, such as cafés, restaurants, and convenience stores. This commercial coffee equipment stands out for its reliability, efficiency, and user-friendly features, making it a preferred choice among coffee retailers.

A standout feature of the FMD-2 is its dual coffee bean hopper system, which allows for the storage and dispensing of two different coffee blends simultaneously. This versatility provides establishments the opportunity to cater to varying customer preferences, whether they prefer a robust espresso or a smooth medium roast. The hoppers can hold a significant amount of coffee beans, ensuring that the machine can keep up with high demand without the need for frequent refilling.

The FMD-2 incorporates state-of-the-art brewing technology, including the ability to brew coffee quickly while preserving the essential flavor characteristics of the beans. Its precision brewing process ensures consistency in taste and quality, which is crucial for customer satisfaction in a commercial setting. The machine is equipped with adjustable brew times and temperatures, allowing operators to fine-tune the brewing process according to specific coffee styles or customer preferences.

Another notable characteristic of the Bunn FMD-2 is its digital interface, which features an intuitive touchscreen display. This modern interface simplifies the operation of the machine, enabling baristas and staff to quickly train and adapt to its functionalities. The display provides real-time feedback on brewing status, maintenance reminders, and settings adjustments, making it easier to ensure optimal performance and reduce downtime.

In addition to its user-friendly design, the Bunn FMD-2 is constructed for durability. Its stainless steel exterior not only enhances its aesthetic appeal but also ensures that it can withstand the rigors of daily use in a bustling environment. The machine is designed with easy maintenance in mind, allowing for straightforward cleaning and servicing to keep it operating at peak performance.

Overall, the Bunn FMD-2 is a versatile, reliable, and innovative coffee dispensing solution that meets the demands of today’s coffee enthusiasts. With its dual hopper system, precision brewing technology, and user-friendly interface, it’s an ideal choice for any establishment looking to elevate their coffee offerings and enhance customer experience.
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