Bunn JDF-4S service manual Adjustment & Optional Settings, Water Flow Testing and Adjustment

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dispense).
7. Reinstall the splash panel and drip tray and reconnect the dispenser to the power source. 14
6. Repeat steps 1 through 5 as necessary until the correct water flow rate is achieved.
7. Repeat steps 1 through 5 for the remaining dispense positions.
8. Place the Program switch back into the OFF position.
Pump Speed Adjustment
1. Disconnect the dispenser from the power source.
2. Remove the drip tray.
3. Remove the two screws securing the splash panel and remove the splash panel
4. Locate the adjustment knobs on the circuit board.
NOTE: Start with the adjustment dial in the nine o'clock position.
5. Turn the adjustment knobs clockwise to increase speed and counterclockwise to decrease speed.
NOTE: If splashing occurs while dispensing, reduce water flow rate. Then re-adjust pump speed to achieve proper ratio/ brix target.
6. The knob positions directly correspond to dispense station locations.
NOTE: Some 2S models have 4 adjustment knobs on the circuit board. For these models use the two left most knobs to make pump speed adjustments. Left most being station #1 (left side dispense) and left center being station #2 (right side
-
As Required
High Viscosity Juice
*4.0 fl. oz (118 ml) per 3-second test
3.0 fl. oz (89 ml) per 3-second test
*Maximum flow rate may be less depending on the water pressure supply at each location.
Note: Information for specific products listed in this table is to be used for reference only. Consult the product label for exact mix ratio and/or brix %. See product label for target brix %.
3+1 through 7+1
Above 7+1
13.0%
*
*
12.0%
5+1
*3.0 fl. oz (89 ml) per 3-second test
4+1
Prune Juice
Other
Orange Juice
Pineapple Juice
Cranberry Fruit Cocktail
Grapefruit Juice
Lemonade
Apple Juice
Fruit Punch
Grape Juice
Other
Other
16.0%
*
11.8%
12.8%
14.0%
10.6%
*3.0 fl. oz (89 ml) per 3-second test
Brix %
Product
Mix Ratio
(water + concentrate)
2+1
Adjust water flow rate to:
P3586
FIG 17 Adjusting Water Flow
Using 1/4" allen wrench

ADJUSTMENT & OPTIONAL SETTINGS

Water Flow Testing and Adjustment

NOTE: Purge all dispense stations to remove air from water line before making initial adjustments.

1.Place a graduated measuring cup or the large chamber of the empty brixing cup (BUNN-O-MATIC part number 33095.0000) under the appropriate dispense nozzle. Place the Program switch in the ON position.

2.Press and release the desired “Product Dispense Switch” three times.(On Portion Control models, use the plus/stop switches)

3.The selected position will dispense water (no concentrate) only for 3 seconds.

4.Measure the water dispensed. Suggested target is 3 ounces (1 ounce per second flow rate.

5.Adjust the water flow rate Fig 17, (clockwise to increase flow rate; counterclockwise to decrease flow rate) to the corresponding product mix ratio. Chart below provides general brix instructions.

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Contents JDF-2S JDF-4S Phone 217 529-6601 FAX 217BUNN-O-MATIC Commercial Product Warranty Contents User NoticesElectrical Requirements Initial SET-UPCE Requirements Plumbing RequirementsDoor Cover Installation Secure the door cover using 5 screws providedInitial Fill Plumbing HookupPlumbing Connections JDF-2S Plumbing Connections JDF-4S Initial Fill Product Dispense Switch Mechanical Switch Machines Refrigeration SwitchRefrigeration Switch Operating ControlsDispense Lockout Switch Product Dispense Switch Membrane Switch MachinesDispense Lockout Switch Program SwitchPortion Control Option Membrane Switch Machines Portion Control Option Mechanical Switch MachinesPush and Hold Membrane Switch Machines Dispenser USETemperature LEDs JDF-4S Temperature LEDs JDF-2S Late ModelsCleaning & Preventive Maintenance Daily Rinse ProcedureCleaning Monthly Clean Condenser Coils and Filter Open dispenser doorAdjustment & Optional Settings Water Flow Testing and AdjustmentFrozen Concentrates LoadingPriming Ambient Concentrates OptionalRatio Target Optional Cold Water Flow Adjustment Dispenser LockoutLED # Circuit Board LED Indicators JDF-2S Early ModelsFunction List LED Color IlluminatesJDF-4S Probable Cause TroubleshootingProblem RemedyRefrigeration TroubleshootingCompressor ON/OFF switch Dirty condenser filter or fins Space around machineProblem Probable Cause Remedy Concentrate only Water onlyTray Initial fill/setupNect fittings Water pressure greater thanProblem Probable Cause Coolant Schematic Diagram Schematic Wiring Diagram JDF-2S Models with LED Lited DoorsModels with Flourescent Lited Doors RED BLKSchematic Wiring Diagram JDF-4S BRN BLU EMIWire Quick Setup Guide JDF-2S and JDF-4S JDF-2S shown Shown.See Initial Fill
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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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