Bunn JDF-4D, JDF-4SB manual Temperature Sensor all Models, 32 F 5k Ω, 77 F 350 Ω

Page 47

SERVICE (CONT.)

Temperature Sensor (all Models)

FIG. 67 TEMPERATURE SENSOR

Location:

The Temperature Sensor is located inside the cabinet between the fan and the water coil.

Test Procedures:

1.Remove the left side housing panel.

2.Connect a voltmeter across the two leads of the temperature sensor (leave plug connected); The indication must be:

a)Approx. 1.4 vdc @ 71° F

b)Approx. 2.6 vdc @ 32° F

If voltage reading is 0v, the Control Board is not sup- plying the necessary 5v and should be replaced. If the reading stays at 5vdc, replace sensor.

Alternate Test:

2.Disconnect the plug on sensor leads and check resistance as indicated in chart.

If resistance reading is not within the range listed in chart, replace sensor.

Removal and Replacement:

1.Remove the left side housing panel.

2.Disconnect the plug on the temperature sensor leads from the connector on the dispenser main harness.

3.Open the cabinet door and remove the product containers.

4.Remove the cabinet fan and fan guard assembly.

5.Clip off the connector and pull the temperature sensor from the top left rear of the cabinet and discard.

6.Push new temperature sensor wires into the grom- met at the top left rear of the cabinet and secure to sensor mounting clip.

7.Refer to Fig. 68 and connect the wires to the new plug.

8.Connect the sensor plug to the connector from the main harness.

9.Reinstall the cabinet fan and guard assembly.

10.Reinstall the left side housing panel.

1.BLK to GRY J7-1 (Control Board) Positive

2.BLK to WHI/BLK J7-2 (Control Board) Negative

2 1

FIG. 68 TEMPERATURE SENSOR

TEMP

RESISTANCE

VOLTAGE

 

 

 

SHORTED

0 Ω

0VDC

 

 

 

32° F

1.5k Ω

2.5VDC

0° C

 

 

 

 

 

77° F

350 Ω

1.1VDC

25.0° C

 

 

 

 

 

OPEN

INFINITE

5.0VDC

 

 

 

NOTE: ALL FIGURES LISTED ABOVE ARE APPROXIMATE.

47

49179

020514

 

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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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