Bunn JDF-4SB Temperature Probe all Models, Temp Resistance Voltage, 32 F 31.2k 34k Ω, 25.0 C

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SERVICE (CONT.)

Temperature Probe (all Models)

FIG. 65 TEMPERATURE PROBE

Location:

The temperature probe is located on the top of the tank assembly.

Test Procedure:

1.Disconnect the dispenser from the power source.

2.Remove the top rear cover.

3.With a voltmeter, back probe the connector from the temperature probe.

4.Connect the dispenser to the power source.

5.See the chart for voltage readings.

6.For continuity check, disconnect the dispenser from the power source.

7.Disconnect the two pin connector from the dis- penser main wiring harness.

8.With an ohmmeter, check for continuity across the pins for the black and white wires.

9.See the chart for resistance/voltage readings. Al- ternate check: Leave two pin connector plugged in, place dc voltmeter across two pin connector in parallel, check voltage with dispenser running.

10.Verify wiring to probe.

11.If readings are not present as described, replace the temperature probe.

NOTE: Some meters have difficulty measuring a sen- sor either rapidly rising or falling in temperature.

Removal and Replacement:

1.Disconnect the dispenser from the power source.

2.Remove the top rear cover.

3.Disconnect the two pin connector from the dis- penser main wiring harness.

4.Remove the temperature probe by firmly pulling- up on the tube at the tank lid. This will disengage the grommet from the tank lid.

5.Slide a new grommet on to the new temperature probe.

6.Insert the temperature probe through the hole in the tank lid and press the grommet firmly and evenly so that the groove in the grommet fits into the tank lid.

7.Reconnect the two pin connector to the dispenser main wiring harness.

BLKor ORN pin 1

WHI pin 2

FIG. 66 TEMPERATURE PROBE

TEMP	RESISTANCE	VOLTAGE

SHORTED	0 Ω	0VDC

32° F	31.2k - 34k Ω	3.0VDC
0.0° C

77° F	9.8k - 10.2k Ω	1.5VDC
25.0° C

OPEN	INFINITE	5.0VDC

NOTE: ALL FIGURES LISTED ABOVE ARE APPROXIMATE.

46	49179	012214

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Contents JDF-4D, JDF-4SB Phone 217 529-6601 FAX 217BUNN-O-MATIC Commercial Product Warranty Introduction Recommended Daily Cleaning Instructions Required Regular Maintenance Cold Water Circulation Problem Probable CauseRemedy Refrigeration Problem Probable Cause RemedyDispenser Locked Out 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 voltmeterDisconnect the two black wires from the switch Dispense Platform Switch all ModelsReturn power to the dispenser 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 Lamps JDF-2S, JDF-4S Disconnect power from the dispenserLED regulator board Rectifier JDF-2S, JDF-4S RectifierRelay all Models Refer to to reconnect the wiresVolts ac for 120 volt models Volts ac for 230 volt 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 Ω32 F 5k Ω Temperature Sensor all Models77 F 350 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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