Bunn JDF-4D manual Unit is not working, Replace control board, Product viscosity or too cold, Ting

Page 11

TROUBLESHOOTING (Continued)

PROBLEM

PROBABLE CAUSE

REMEDY

Unit is not working

1. Step-down transformer.

Check for 120/24 or 230/24 vac. If no 24vac reading, replace step-down transformer.

 

2. Main control board.

If 24 vac present and no LED’s lit,

 

 

replace control board..

Difficulty brixing and/or weak bever-

1. Product viscosity or too cold.

Thorough thaw of product before use

age

 

(35° - 40°)

 

2. Low water pressure.

Maintain 20 psi or higher and a mini-

 

 

mum flow rate of 1 fl oz/sec.

 

3. High water pressure.

Over 100 psi, install a pressure regu-

 

 

lator and set to 50 psi.

 

4. Dispense valve adjustment set-

A) Perform 3 second water dispense

 

ting.

test. Factory setting is 1.0 oz/sec.

 

 

Acceptable water flow rate is .-0.8

 

 

to 1.5 oz/sec depending on the mix

 

 

ratio (4+1).

 

 

B) Adjust water to proper mix ratio.

 

 

Once water is set, adjust motor speed

 

 

to achieve brix %.

 

5. Brix ratio.

Check for proper brix ratio per prod-

 

 

uct using Total Dispense method and

 

 

or refractometer method.

Difficulty brixing and/or weak bever-

1. Pump tubing.

Inspect, clean, or replace tubing

age

 

and pump rotor/rollers for ease of

 

 

rotation.

 

2. Use of portable water pump.

A) Follow plumbing requirements for

 

 

pressure and flow rate.

 

 

B) Source another portable pump

 

 

or water supply that meets require-

 

 

ments.

Difficulty brixing bag-in-box

Vacuum leak

Inspect all lines and connections

 

 

from bag-in-box connector to bottle

 

 

adapter assembly.

11

49179

110613

 

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Contents Phone 217 529-6601 FAX 217 JDF-4D, JDF-4SBBUNN-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 Check for kinked flex line When dispensing. If yes, replaceContinuity Ed replace relayWater only Concentrate only100psi Nect fittingsTray Water pressure greater thanReplace control board Pump tubing Inspect, clean, or replace tubing AgeAdapter assembly Unit is not workingComponent Access ServiceAccess Panels Servicecont Access PanelsDispense Platform Removal Servicecont Dispense Platform RemovalLocation ServiceTest Procedure Ballast JDF-2S,4SCabinet Fan all Models Remove the four screws attaching the fan and cover assemblyLocation LG Compressor JDF-2S,4S,4DDesign Pressures High 335 Low 88 psi CompressorCompressor GD Compressor JDF-2S,4S,4DDisconnect and remove the transformer Compressor Thermal Compressor JDF-4SBBLU/BLK Compressor Switch Compressor Switch all ModelsCondenser FAN Condenser Fan all ModelsControl Board, Main all Models Test Procedure Power Supply CircuitryTo the transformer See Transformer Portion Control Board JDF-2S,4SWith a voltmeter, back probe check the voltage Source. The indication must be 24 volts acPush Button Control Board Push Button Control Board JDF-4DPortion Control Board JDF-4D With a voltmeter Circulation Pump all ModelsReturn power to the dispenser Dispense Platform Switch all ModelsDisconnect the two black wires from the switch Dispense Pump Dispense Pump all Models except JDF-4DDispense Motor all Models Reconnect the two wires to the motor as shown in FigDispense Valve Dispense Valve all ModelsDispense Switches Dispense Switches JDF-2S, JDF-4SCold Water Dispense Switch Cold Water Dispense Switch JDF-4S onlyLocation Dispense Membrane Switch all ModelsMembrane Switch EMI Filter EMI Filter all ModelsLamps & Holders Lamps, Holders and Ballasts Early ModelsLED regulator board Disconnect power from the dispenserLED Lamps JDF-2S, JDF-4S Rectifier Rectifier JDF-2S, JDF-4SVolts ac for 120 volt models Volts ac for 230 volt models Refer to to reconnect the wiresRelay all Models Resistor Resistor all 230V ModelsIf voltage is present as described, proceed to #5 Solenoid Cold Water JDF-4S only120V 1.2 kΩ 230V 3.84 kΩ Solenoid Inlet all Models77 F 8k 10.2k Ω Temperature Probe all ModelsTemp Resistance Voltage 32 F 31.2k 34k Ω77 F 350 Ω Temperature Sensor all Models32 F 5k Ω Transformer Terminals Transformer all ModelsTransformer Lited Doors JDF-2S, JDF-4S Water Q7 Compressor Relay Q25Water Q27 Water Q28Diagram 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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