Bunn JDF-4S service manual Optional Cold Water Flow Adjustment, Dispenser Lockout

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ADJUSTMENT & OPTIONAL SETTINGS (cont)

Temperature Compensated Refractometer Method

1.Adjust the water flow as described in Water Flow Testing and Adjustment.

2.Place an empty container under the appropriate dispense nozzle.

3.Press and hold the “Product Dispense Switch” Figs 9 & 10, until water and concentrate begin flowing freely from the dispense nozzle.

4.Discard the product caught previously and place the empty container back under the dispense nozzle.

5.Press and hold the “Product Dispense Switch” until the cup is filled.

6.Stir the contents of the cup, and use the refractometer (according to the manufacturer’s instructions) to check the brix %.

7.Adjust the pump speed (down to decrease the brix %; up to increase the brix %) to achieve the correct brix % as described in Pump Speed Adjustment.

Optional Cold Water Flow Adjustment

Some dispensers are equipped with an optional cold water dispense valve. It is recommended to adjust the flow rate upon initial set up of the dispenser. The adjustment for the cold water can be located inside the dispenser behind the right service panel. The cold water dispense valve is mounted to the frame just above the ice bath. Attached to this valve is a needle type adjustment valve. Turn the adjustment clockwise to decrease the water flow, and counter-clockwise to increase the water flow.

Dispenser Lockout

Dispense functions of the dispenser can be turned-off to prevent unauthorized use of the dispenser, while keeping the refrigeration system running.

1.Locate the Dispense Lockout switch at the bottom front of the dispenser behind the drip tray.

2.Place the switch in the OFF position to prevent dispensing.

3.Place the switch in the ON position to allow dispensing.

NOTE: This switch will also operate the door lights on models equipped with this feature.

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Contents Phone 217 529-6601 FAX 217 JDF-2S JDF-4SBUNN-O-MATIC Commercial Product Warranty User Notices ContentsCE Requirements Initial SET-UPElectrical Requirements Plumbing RequirementsSecure the door cover using 5 screws provided Door Cover InstallationInitial Fill Plumbing HookupPlumbing Connections JDF-2S Plumbing Connections JDF-4S Initial Fill Refrigeration Switch Refrigeration SwitchProduct Dispense Switch Mechanical Switch Machines Operating ControlsDispense Lockout Switch Product Dispense Switch Membrane Switch MachinesDispense Lockout Switch Program SwitchPush and Hold Membrane Switch Machines Portion Control Option Mechanical Switch MachinesPortion Control Option Membrane Switch Machines Dispenser USETemperature LEDs JDF-2S Late Models Temperature LEDs JDF-4SDaily Rinse Procedure Cleaning & Preventive MaintenanceOpen dispenser door Cleaning Monthly Clean Condenser Coils and FilterWater Flow Testing and Adjustment Adjustment & Optional SettingsPriming LoadingFrozen Concentrates Ambient Concentrates OptionalRatio Target Dispenser Lockout Optional Cold Water Flow AdjustmentFunction List Circuit Board LED Indicators JDF-2S Early ModelsLED # LED Color IlluminatesJDF-4S Problem TroubleshootingProbable Cause RemedyCompressor ON/OFF switch Dirty condenser filter or fins TroubleshootingRefrigeration Space around machineProblem Probable Cause Remedy Water only Concentrate onlyNect fittings Initial fill/setupTray Water pressure greater thanProblem Probable Cause Coolant Schematic Diagram Models with LED Lited Doors Schematic Wiring Diagram JDF-2SRED BLK Models with Flourescent Lited DoorsBRN BLU EMI Schematic Wiring Diagram JDF-4SWire Shown.See Initial Fill Quick Setup Guide JDF-2S and JDF-4S JDF-2S shown
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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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