Bunn JDF-4SB manual Relay all Models, Volts ac for 120 volt models Volts ac for 230 volt models

Page 42

SERVICE (CONT.)

Relay (all Models)

FIG. 57 RELAY

Location:

The relay (or contactor) is located inside the dis- penser chassis on the lower outside of the component bracket.

Test Procedures:

1.Disconnect the dispenser from the power source.

2.With a voltmeter, check the voltage across the white wire and the white/black wire. Connect the dispenser to the power source. The indication must be:

a)120 volts ac for 120 volt models.

b)230 volts ac for 230 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 Wir- ing Diagram and check the dispenser wiring harness. If harness has continuity, replace Control Board.

4.Disconnect the blue/black wire and the red/black wires from relay terminals #4 and #6.

5.Connect the dispenser to the power source.

6.Turn on power and check for continuity across terminals on relay.

If continuity is present as described, disconnect the dispenser from power source and reconnect wires to terminals #4 and #6, the relay is working.

If continuity is not present as described, do the same continuity test across terminals #2 and #8. If continu- ity is present between terminals #2 and #8, reconnect wires to terminals #4 and #6 instead of #2 and #8.

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

Removal and Replacement:

1.Disconnect the wires from the relay.

2.Remove the two #8-32 locking screws securing the relay and mounting bracket to the chassis. Remove and discard relay.

3.Install the new relay to the mounting bracket and then on the chassis using two #8-32 locking screws.

4.Refer to Fig. 58 to reconnect the wires.

Terminal #0

Terminal #1

WHI from

BLK from

Main Harness

Main Harness

 

Terminal #8

 

BLK from

 

Main Harness

Terminal #2

Terminal #6

Terminal #4

WHI/ORN from

Main Harness

 

FIG. 58 RELAY TERMINALS

42

49179

110613

 

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Contents JDF-4D, JDF-4SB Phone 217 529-6601 FAX 217BUNN-O-MATIC Commercial Product Warranty Introduction Recommended Daily Cleaning Instructions Required Regular Maintenance Problem Probable Cause Cold Water CirculationRemedy Problem Probable Cause Remedy RefrigerationDispenser Locked Out Ed replace relay When dispensing. If yes, replaceContinuity Check for kinked flex lineConcentrate only Water onlyWater pressure greater than Nect fittingsTray 100psiUnit is not working Pump tubing Inspect, clean, or replace tubing AgeAdapter assembly Replace control boardService Component AccessServicecont Access Panels Access PanelsServicecont Dispense Platform Removal Dispense Platform RemovalBallast JDF-2S,4S ServiceTest Procedure LocationRemove the four screws attaching the fan and cover assembly Cabinet Fan all ModelsLG Compressor JDF-2S,4S,4D LocationCompressor Design Pressures High 335 Low 88 psiGD Compressor JDF-2S,4S,4D CompressorDisconnect and remove the transformer Compressor JDF-4SB Compressor ThermalBLU/BLK Compressor Switch all Models Compressor SwitchCondenser Fan all Models Condenser FANTest Procedure Power Supply Circuitry Control Board, Main all ModelsSource. The indication must be 24 volts ac Portion Control Board JDF-2S,4SWith a voltmeter, back probe check the voltage To the transformer See TransformerPush Button Control Board JDF-4D Push Button Control BoardPortion Control Board JDF-4D Circulation Pump all Models With a voltmeterDispense Platform Switch all Models Disconnect the two black wires from the switchReturn power to the dispenser Dispense Pump all Models except JDF-4D Dispense PumpReconnect the two wires to the motor as shown in Fig Dispense Motor all ModelsDispense Valve all Models Dispense ValveDispense Switches JDF-2S, JDF-4S Dispense SwitchesCold Water Dispense Switch JDF-4S only Cold Water Dispense SwitchDispense Membrane Switch all Models LocationMembrane Switch EMI Filter all Models EMI FilterLamps, Holders and Ballasts Early Models Lamps & HoldersDisconnect power from the dispenser LED Lamps JDF-2S, JDF-4SLED regulator board Rectifier JDF-2S, JDF-4S RectifierRefer to to reconnect the wires Relay all ModelsVolts ac for 120 volt models Volts ac for 230 volt models Resistor all 230V Models ResistorSolenoid Cold Water JDF-4S only If voltage is present as described, proceed to #5Solenoid Inlet all Models 120V 1.2 kΩ 230V 3.84 kΩ32 F 31.2k 34k Ω Temperature Probe all ModelsTemp Resistance Voltage 77 F 8k 10.2k ΩTemperature Sensor all Models 32 F 5k Ω77 F 350 Ω Transformer all Models Transformer TerminalsTransformer Lited Doors JDF-2S, JDF-4S Water Q28 Compressor Relay Q25Water Q27 Water Q7Diagram for JDF-2S LED Lited Doors Schematic Wiring Schematic Wiring Diagram JDF-4S Schematic Wiring Diagram JDF Schematic Wiring Diagram JDF-4D Schematic Wiring Diagram JDF-4D Electrical Schematic Diagram
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JDF-4D, JDF-4SB, JDF-4S specifications

The Bunn JDF-4S is a high-performance commercial coffee brewer designed to meet the needs of busy coffee shops, restaurants, and other establishments requiring a reliable and efficient coffee brewing solution. This versatile machine boasts an array of advanced features and technologies, making it a prominent choice among professionals in the coffee industry.

One of the most notable features of the Bunn JDF-4S is its ability to brew up to 4 gallons of coffee per hour, ensuring that establishments can keep pace with high-demand environments. This capacity makes it an ideal choice for venues that experience peak periods of coffee consumption, minimizing wait times for customers. The machine is designed with a multiple-brew option, allowing users to select various brew methods, which can cater to diverse customer preferences.

The JDF-4S incorporates Bunn’s patented brewing technology, which utilizes a precision-controlled process to ensure optimal flavor extraction. The brewed coffee is delivered at an ideal temperature, typically between 195°F and 205°F, promoting maximum taste and aroma. The machine also features a programmable digital controller that enables users to set specific brew times and adjust water temperature settings to achieve consistent results.

Another significant characteristic of the Bunn JDF-4S is its durability and ease of use. Constructed with high-quality materials, the machine is built to withstand the rigors of daily operation. The user-friendly interface features a simple touchpad design for easy navigation and programming. Additionally, the machine includes a built-in diagnostics program, helping users quickly identify and troubleshoot potential issues, thereby minimizing downtime.

The JDF-4S also offers flexible brewing options, including iced coffee brewing, enhancing its versatility. It is compatible with Bunn’s extensive range of coffee and tea dispensers, allowing businesses to expand their beverage offerings effortlessly. Furthermore, the unit features an easy-access water reservoir for quick refilling and reduced wait times during busy service periods.

In terms of maintenance, the Bunn JDF-4S is designed with user convenience in mind. The machine includes a rinse and clean cycle to ensure optimal hygiene and coffee quality. Integrated clean alerts guide users through the cleaning process, promoting regular upkeep and ensuring the longevity of the brewer.

In summary, the Bunn JDF-4S represents a cutting-edge solution for coffee brewing that prioritizes performance, versatility, and ease of use. With its advanced brewing technology, user-friendly features, and robust construction, it offers an exceptional choice for businesses seeking to serve high-quality coffee efficiently.
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