Bunn FMD-1 service manual Control Board FMD-2 only, Thermostat Terminals

Page 19

SERVICE (cont.)

CONTROL THERMOSTAT - FMD-1 & FMD-2 (cont.)

a)120 volts ac for two wire 120 volt models.

b)208 volts ac for three wire 120/208 volt models.

c)240 volts ac for three wire 120/240 volt models.

5.Disconnect the dispenser from the power source.

If voltage is present as described the control thermo- stat is operating properly. Reinstall bulb into the tank. If voltage is not present as described, replace the thermostat.

Removal and Replacement.

1.Remove the thermostat capillary bulb by firmly pulling-up on the capillary at the tank lid. This will disengage the grommet from the tank lid.

2.Loosen the two #6-32 screws securing the ther- mostat to the front tank mounting bracket.

3.Disconnect the wires from the thermostat.

4.Remove thermostat and remove the screws and spacers from the thermostat.

5.Discard thermostat.

6.Install two spacers and two #6-32 screws on the new thermostat.

7.Position the thermostat on the botttom side of the front tank mounting bracket and tighten the two #6-32 screws.

8.Slide the grommet to the line 4.5" above the bulb on the new capillary tube.

9.Insert the capillary bulb through the hole in the tank lid and press the grommet firmly and evenly so that the groove in the grommet fits into the tank lid.

10.Carefully bend the capillary tube so that the tube and bulb inside the tank are in the vertical position and away from any electrical connections.

11.Refer to Fig. 10 and reconnect the wires.

NOTE - The capillary tube must be clear of any electri- cal termination and not kinked.

BLK from Limit

Thermostat

BLK from Tank

Heater Switch

 

P1668

FIG. 10 THERMOSTAT TERMINALS

 

CONTROL BOARD - FMD-2 ONLY

J1

 

1

 

1

 

J2

 

J4

 

J3

 

FIG. 11 CONTROL BOARD

P1666

 

Location:

The Control Board is located behind the lower front access cover mounted on the component bracket.

Test Procedure:

Liquid Level 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.

19

29112 101598

 

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Contents BUNNFMD-1 FMD-2 FMD-1 FMD-2 WarrantyIntroduction User NoticesFMD-1 only 00656.000028368.0001 Plumbing Requirements Initial SET-UPElectrical Requirements Electrical HOOK-UPRunning a Rinse Sequence Rinse Timer FMD-2 onlyInitial Fill & Heat Liquid Level ControlCold Beverage SET-UP Optional FMD-2 only CleaningAdjustments Hopper Motor Speed Adjustment FMD-1Draining the HOT Water Tank Probable Cause TroubleshootingProblem Product will not dispenseProbable Cause Remedy See Problem Probable CauseStat for testing procedures. See FMD-1Problem Probable Cause Remedy Dispenser is making unusual Refer to Service Lamp, see page 28 for lamp replacementAuger Drive Components FMD-1 ServiceComponent Access ContentsRetainer Clip Ing panel Retainer Clip Hopper AssemblyHopper Lid Spacer Auger Motor Hopper Base Dust Seal WasherTo the rear of the auger motor mounting panel Auger Drive Components FMD-1Auger Drive Components FMD-2 Hopper Hopper Assy Remove dust seal 17 from auger motor Disconnect the wires from the auger motor 16 to be removedRemove auger motor and discard Location Ballast FMD-1 & FMD-2Thermostat Terminals Control Board FMD-2 onlyService Dispense Switch Dispense Switchs FMD-1 & FMD-2 FAN FMD-1 & FMD-2 Dispense Switch Terminals P1449FMD-2 Whipper Motor Terminals P1221 Frother and Whipper Motor FMD-1 shown & FMD-2Hopper Drive Board Hopper Drive Board FMD-1 onlyHopper Drive Board Terminals Hopper Drive Board FMD-1 onlyDoor Assy Upper Panel Lamp Holders Lower Panel Lamp Replacement Refer to FigLevel Control Board and Level Probe FMD-1 only Lamp Replacement Refer toAs assembly Lamp Starter and Socket Refer to LocationLevel Control Board and Level Probe FMD-1 only Reconnect the violet wire to terminalLocation RINSE/RUN Switch FMD-1WHI/RED to RINSE/RUN Switch FMD-2BLK from Main Harness WHI/BRN to YEL to Control Board J2-3 Cold Water Solenoid Valve Solenoid Valve Cold Water OPTIONALFMD-2 onlyFMD-1 Solenoid Valve Dispense FMD-1 & FMD-2 Tank Heater Solenoid Valve Inlet FMD-1 & FMD-2Main Harness Thermostat Tank Heater FMD-1 shown & FMD-2WHI/GRN T7 WHI/BLK T12 Transformer FMD-2 onlySingle Phase Schematic Wiring Diagram FMD-1Schematic 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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