Bunn JDF-4D manual Portion Control Board JDF-2S,4S, With a voltmeter, back probe check the voltage

Page 26

SERVICE (CONT.)

Portion Control Board (JDF-2S,4S)

P4034.25

FIG. 25 PORTION CONTROL BOARD

Location:

The Portion Control Board is located inside the door cover mounted on the bracket.

Removal and Replacement:

1.Remove the five screws securing the door cover to the door frame.

2.Carefully pull the cover forward and disconnect all switch harnesses from the connectors on the control board.

3.Remove the four #6-20 screws securing the control board to the light panel.

4.Remove the spacers from the control board and discard the old board.

5.Install the spacers on to the new control board.

6.Install new control board on the light panel using four #6-20 screws.

7.Position the door cover to the door frame and reconnect all switch harnesses to the connectors on the control board.

8.Secure the door cover to the frame with the five screws previously removed.

Test Procedure:

 

 

 

 

1. Disconnect the dispenser from the power source.

 

 

 

 

2. With a voltmeter, back probe check the voltage

 

 

 

 

 

across pins 1 & 5 of the J6 connector on the wir-

 

 

 

 

 

ing harness. Connect the dispenser to the power

 

 

 

 

 

source. The indication must be 24 volts ac.

 

J-8

 

 

3.

Disconnect the dispenser from the power source.

 

J-7

 

 

 

 

 

 

 

If voltage is not present as described, refer to the Wiring

 

 

J-9

 

Diagrams and check the dispenser wiring harness back

 

 

 

 

to the transformer (See TRANSFORMER).

 

 

 

 

 

 

 

 

J-6

 

 

 

J-1

Cold Water Switch

 

 

J-5

 

 

J-2

Left Left Dispense Switch

 

 

J-1

 

 

J-3

Left Middle Dispense Switch

 

J-4

 

 

 

J-4

Right Middle Dispense Switch

 

J-3

 

 

 

J-5

Right Right Dispense Switch

 

J-2

 

 

 

J-6

Main Harness

 

 

 

 

 

 

 

 

 

J-7

N/A

 

 

 

 

 

J-8

N/A

 

 

 

 

 

J-9

N/A

 

FIG. 26 CONTROL BOARD CONNECTORS

 

 

 

 

 

 

 

 

 

26

 

49179

110613

 

 

 

 

 

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Page 25 Page 27
Contents JDF-4D, JDF-4SB Phone 217 529-6601 FAX 217BUNN-O-MATIC Commercial Product Warranty Introduction Recommended Daily Cleaning Instructions Required Regular Maintenance Remedy Problem Probable CauseCold Water Circulation Dispenser Locked Out Problem Probable Cause RemedyRefrigeration 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 voltmeterReturn power to the dispenser Dispense Platform Switch all ModelsDisconnect the two black wires from the switch 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 & HoldersLED regulator board Disconnect power from the dispenserLED Lamps JDF-2S, JDF-4S Rectifier JDF-2S, JDF-4S RectifierVolts ac for 120 volt models Volts ac for 230 volt models Refer to to reconnect the wiresRelay all 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 Ω77 F 350 Ω Temperature Sensor all Models32 F 5k 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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