Bunn manual Tank Heater Relay FMD-4,-5,120V Dispensers only, BRN/BLK from WHI from Main Harness

Page 51

SERVICE (cont.)

TANK HEATER RELAY (FMD-4,-5,120V Dispensers only)

J1

J2

J4

J3

J1

J2

J4

J3

P4095

FIG. 52 TANK HEATER RELAY

Location:

The tank heater relay is located behind the lower front access cover, mounted on the left rear side of the component bracket.

Test Procedure:

1.Disconnect the dispenser from the power source.

2.Place the tank heater switch in the “OFF” (upper) position.

3.With an ohmmeter, check for continuity between normally closed (NC-5) and common (COM-3) terminals of the relay. The indication must be less than 1 ohm.

If continuity is present as described, proceed to step 4.

If continuity is not present as described, replace the relay.

6.With an ohmmeter, check for continuity between the normally closed (NC-5) and common (COM-3) terminals of the relay.

7.Place containers below any three dispense noz- zles.

8.Connect the dispenser to the power source.

9.Simultaneously initiate dispenses at each of the selected dispense stations while monitorintg con- tinuity across the referenced terminals of the tank heater relay. The indication must be open circuit.

If continuity is absent as described, the relay is func- tioning correctly.

If continuity is present, replace the relay.

Removal and Replacement:

1.Loosen the three #8-32 screws securing the com- ponent bracket to the dispenser housing base.

2.Pull component bracket out the front of the dis- penser far enough so the tank heater relay can be disconnected from the main wiring harness.

3Disconnect the tank heater relay from the main wiring harness.

4.Remove the two #8-32 screws securing the tank heater relay to the rear of the component bracket.

5.Remove and discard the tank heater relay.

6.Install new tank heater relay on the rear of the component bracket and secure with two #8-32 screws.

7.Connect the tank heater relay to the main wiring harness (see Fig. 53).

8.Place the component bracket into position and tighten the three #8-32 screws.

4.With an ohmmeter, check the resistance across the coil terminals (1 & 2) of the relay. The indication must be approximately 4,000 ohms (4kΩ).

If the resistance measures as described, proceed to step 5.

If the resistance does not measure as described, replace the relay.

5.Disconnect the wires from the normally closed (NC- 5) and common (COM-3) terminals of the relay.

 

BLK from

 

Main Harness

BRN/BLK from

WHI from

Main Harness

Main Harness

BLK from

No Connection

 

Main Harness

 

P2639

FIG. 53 TANK HEATER RELAY TERMINALS

51

42672 122209

 

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Contents Phone 217 529-6601 FAX 217 FMD SeriesExcluding regular maintenance items BUNN-O-MATIC Commercial Product WarrantyIntroduction Cleaning Required Regular Maintenance Problem Probable Cause Remedy ProblemProduct will not dispense Level Control Board and Probe FMD-1Problem Probable Cause Remedy Troubleshooting Procedures. See Product overflows container Dispense SwitchInstall a regulator if necessary to Excess dust Fan Refer to Service42672 20,23 Component AccessAccess Panels SERVICEcontService Auger Drive Components all Models Test Procedures Auger MotorLocation Retainer Clip Panel RED to Control Board ServiceAuger Drive Components Spacer Auger Motor Hopper Base Dust Seal WasherLocknut Auger Motor Bracket Remove auger drive shaft bushing from hopperRinse and dry each item thoroughly Bushing Panel Auger Drive ShaftAuxillary Control Board FMD DBC-3 only Disconnect the dispenser from the power source Service Auxillary Control BoardBallast all Models ServiceControl Board Test Procedure Power SupplyHopper Motor Control Circuitry Check that the RINSE/RUN switch is in the Rinse positionControl board to the component bracket Using four #6-32 keps nutsConnectors on the control board Control BoardControl Board Check that the rinse/run switch is in the run posi- tion Control Board Connectors Remove temperature probe from the tank LocationRemove bulb from the tank Control Thermostat BLK to MainWHI to Main Open the dispenser door and remove the bottom door cover If voltage is present as described, proceed to #6If voltage is present as described, proceed to #7 Digital Touch Control Switch FMD DBC-2,DBC-3 FMD DBC-3FMD DBC-2FD Connectors Digital Touch Control SwitchEMI Filter EMI Filter 230 Volt FMD DBC-3Test Procedures Disconnect the black and white wires from the fan terminalsVacuum FAN all Models Frother and Whipper Motor Frother and Whipper Motor all Models except -2FDWill seat inside the whipper chamber Frother and Whipper MotorHopper Drive Board Hopper Drive Board FMD-1 onlyHopper Drive Board Terminals Disconnect the wires from the switch terminals HOT/COLD Switch Optional for FMD DBC-3Terminals Door Assy Upper Panel Lamp Holders Lower Panel Lamp Holder all ModelsLamp Starter and Socket Level Control Board and Level Probe FMD-1 only Reconnect the violet wire to terminalLevel Board Terminals Limit Thermostat Limit Thermostat all ModelsOverflow Protection Switch RINSE/RUN Switch Rinse /RUN Switch all ModelsCold Water Solenoid Terminals Solenoid Valve Cold Water Optional for FMD-2,-3,-4,-5Dispense Solenoid Valves P1637.40 Location Solenoid Valves Dispense all ModelsSolenoid Valve HOT Water Dispense Solenoid Valve FMD-2FD,DBC-2FD,-3,DBC-3Inlet Solenoid Valve Solenoid Valve Inlet all ModelsTank Heater all Models WHI or RED to Main BLK to Limit Wiring HarnessBRN/BLK from WHI from Main Harness Tank Heater Relay FMD-4,-5,120V Dispensers onlyTank Heater Switch Tank Heater Switch all ModelsDisconnected from the main wiring harness Transformer all ModelsRemove and discard the transformer Q7 & MOV2 Controls Refill Valve Q1 & MOV1 Controls Left Whipper MotorQ2 & MOV3 Controls Center Whipper Motor Q5 & MOV4 Controls Right Whipper MotorBLK Schematic Wiring Diagram FMD-1WHI-16 Schematic Wiring Diagram FMD-1ASchematic 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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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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