Bunn FMD-5, FMD-4 service manual Tank Heater, Main Harness Thermostat

Page 38

SERVICE (cont.)

TANK HEATER

P2635

FIG. 35 TANK HEATER

Location:

The tank heater is located inside the tank and se- cured to the tank lid.

Test Procedure:

1.Disconnect the dispenser from the power source.

2.Check the voltage across the black and white wires 120 volt models or black and red wires for 120/208 volt models or 120/240 volt models with a voltme- ter. Connect the dispenser to the power source. The indication must be:

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.

3.Disconnect the dispenser from the power source.

If voltage is present as described, proceed to #4.

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

4.Disconnect the black wire and the white or red wire from the tank heater terminals.

5.Check for continuity across the tank heater termi- nals.

If continuity is present as described, reconnect the wires, the tank heater is operating properly.

If continuity is not present as described, replace the tank heater.

NOTE - If the tank heater remains unable to heat, remove and inspect heater for cracks in the sheath.

Removal and Replacement:

1.Disconnect the dispenser from the power source.

2.Disconnect the water supply tube on the tank lid.

3.Disconnect the black wires on the limit thermstat.

4.Disconnect the black wire and the white or red wire from the tank heater terminals.

5.Disconnect the pink wire from the liquid level probe and the green wire from the tank.

6.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.

7.Remove the ten #8-32 nuts securing the tank lid to the tank.

8.Remove tank lid with limit thermostat, liquid level probe and tank heater as an assembly.

9.Remove the two hex nuts securing the tank heater to the tank lid. Remove tank heater with gaskets and discard.

10.Install new tank heater with gaskets on the tank lid and secure with two hex nuts.

11.Install tank lid with limit thermostat, liquid level probe and tank heater on the tank and secure with ten #8-32 hex nuts.

12.Connect water inlet line to the tank lid.

13.Reconnect the black wires to limit thermostat, the pink wire to the liquid level probe and the green wire to the tank. Refer to the limit thermostat and the liquid level board and probe sections in this manual when reconnecting wires.

14.Refer to Fig. 36 when reconnecting the wires to the tank heater.

WHI or RED to

BLK to Limit

Main Harness

Thermostat

 

P1218

FIG. 36 TANK HEATER TERMINALS

 

 

 

38

35135 012103

 

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Contents Post Office BOX SPRINGFIELD, Illinois Phone 217 529-6601 FAX 217User Notices BUNN-O-MATIC Commercial Product WarrantyIntroduction FMD-4FMD-4 FMD-5 00831.000028368.0000 Electrical HOOK-UP Initial SET-UPElectrical Requirements Plumbing RequirementsRunning a Rinse Sequence Liquid Level Control Rinse TimersInitial Fill & Heat Dispenser USECold Beverage SET-UP Optional CleaningAdjustments Hopper Motor Speed ProgramingDraining the HOT Water Tank Product will not dispense TroubleshootingProblem Probable CauseProbable Cause Remedy Dripping from dispense tip Lime build-up Problem Probable CauseStat for testing procedures. See LeaksRefer to Operation Rinse Timer. See Product overflows container Dispense SwitchWeak product Water Temperature Tip with a thermometer. ReadingTroubleshooting Problem Contents ServiceComponent Access Auger Drive Components FMD-4Retainer Clip Panel Hopper LidSpacer Auger Motor Hopper Base Dust Seal Washer Location Auger Drive Components FMD-4To the rear of the auger motor mounting panel Locknut Auger Drive Components FMD-4 & FMD-5Bushing Panel Auger Drive Shaft Hopper Dust SealRemove dust seal 17 from auger motor Refer to and reconnect the wires Ballasts FMD-4 & FMD-5Control Thermostat LocationControl Board Control BoardService Control Board Connectors FMD-5 Dispense Switchs FMD-4 & FMD-5FMD-4 Dispense Switches Dispense Switch TerminalsFAN FANFrother and Whipper Motor FMD-4 shown & FMD-5 ComponentsWhipper Motor Terminals INCREASE/DECREASE Switch INCREASE/DECREASE SwitchDoor Assy Upper Panel Lamp Holders Lower Panel Lamp Replacement Refer to FigLamp Holders Lamp Replacement Refer to Lamp Starter and Socket Refer to LocationLimit Thermostat Limit ThermostatBoard J2-3 RINSE/RUN SwitchBLK from Main Harness BRN/BLK to HOT/COLD Switch Optional HOT/COLD SwitchSolenoid Valve Cold Water Optional Cold Water Solenoid ValveDispense Solenoid Valve Solenoid Valve Dispense FMD-4 & FMD-5 Dispense Solenoid Valve TerminalsSolenoid Valve Inlet Inlet Solenoid ValveTank Heater Main Harness ThermostatTank Heater Switch If the resistance measures as described, proceed to step Tank Heater Relay 120V Dispensers onlyPull component bracket out the front of the dis WHI from BLK from Main Harness TransformerRemove and discard the transformer WHI/GRN fromSchematic Wiring Diagram FMD-4 Single PHASE, 60HZ Schematic Wiring Diagram FMD-5 Single PHASE, 60HZ
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FMD-4, FMD-5 specifications

The Bunn FMD-5 is a state-of-the-art coffee dispenser designed specifically for high-volume coffee brewing situations. This machine is ideal for restaurants, convenience stores, and other establishments that require an efficient and reliable coffee dispensing solution.

One of the primary features of the Bunn FMD-5 is its ability to brew and serve fresh, hot coffee with exceptional speed. The unit is capable of dispensing up to five gallons of coffee per hour, making it an ideal choice for busy environments where customer demand is high. The system utilizes a digital brewer control that allows for precise brewing temperatures and times, ensuring consistency in flavor and quality.

The FMD-5 also incorporates advanced technologies to streamline the brewing process. It features a programmable control panel that allows users to adjust settings based on their specific needs. This includes the ability to set brew cycles, control brew levels, and even program different brew strengths. The easy-to-read digital display shows real-time information, making it simple for operators to monitor the brewing process.

Another notable characteristic of the Bunn FMD-5 is its compact and space-saving design. Despite its robust brewing capacity, the unit is designed to fit easily in various retail and foodservice environments. The machine is also built with durable materials, ensuring longevity and reliability under heavy usage.

For maintenance, the FMD-5 is designed with user convenience in mind. It features removable components and accessible areas for easy cleaning and routine maintenance. Users can also benefit from preventative maintenance features that monitor the machine’s performance, alerting operators to any potential issues before they escalate.

In terms of versatility, the Bunn FMD-5 can accommodate different brewing systems and coffee types, allowing users to customize their offerings based on customer preferences. It supports pre-ground coffee and can also be adapted for different brewing styles, enhancing its usability in various coffee service environments.

Overall, the Bunn FMD-5 is an impressive combination of speed, efficiency, and flexibility, making it an excellent choice for any operation that demands high-quality coffee with minimal wait time. Whether you are serving a morning rush of customers or maintaining a steady stream of coffee through the day, the Bunn FMD-5 stands out as a reliable and efficient coffee dispensing solution.
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