Manuals / Bunn / Kitchen Appliance / Coffeemaker

Bunn JDF-4D, JDF-4SB manual SERVICE CONT Temperature Sensor all Models, Resistance, Voltage

Models: JDF-4D JDF-4SB JDF-4S

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SERVICE (CONT.)

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

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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

Image 47

Bunn JDF-4D SERVICE CONT Temperature Sensor all Models, Resistance, Voltage, Note All Figures Listed Above Are Approximate

Contents

49179.0000C 02/14 2013 Bunn-O-Matic Corporation SERVICE & REPAIR MANUALJDF-2S, JDF-4S JDF-4D, JDF-4SB BUNN-O-MATIC CORPORATIONBUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY Preventive Maintenance CONTENTSSafety first Basic MaintenanceRecommended Daily Cleaning Instructions REQUIRED REGULAR MAINTENANCE Cold Water Circulation TROUBLESHOOTINGPROBLEM PROBABLE CAUSEPROBLEM TROUBLESHOOTING ContinuedRefrigeration Dispenser Locked OutREMEDY TROUBLESHOOTING ContinuedPROBLEM PROBABLE CAUSEPROBLEM concentrate onlywater only TROUBLESHOOTING ContinuedPROBABLE CAUSE TROUBLESHOOTING ContinuedPROBLEM 1. Initial fill/setupPROBABLE CAUSE TROUBLESHOOTING ContinuedPROBLEM from bag-in-box connector to bottleCOMPONENT ACCESS SERVICE49179 SERVICECONT ACCESS PANELSFIG. 1 ACCESS PANELS JDF-4S shownThe JDF-4S uses 2 of the two head dispense platforms SERVICECONT DISPENSE PLATFORM REMOVALLocation SERVICE CONT Ballast JDF-2S,4SFIG. 3 BALLAST FIG. 5 CABINET FAN SERVICE CONT Cabinet Fan all ModelsLocation GRN Wire SERVICE CONT LG Compressor JDF-2S,4S,4DSERVICE CONT Compressor Cont FIG.12 COMPRESSOR THERMAL SERVICE CONT GD Compressor JDF-2S,4S,4DFIG. 11 COMPRESSOR LocationPlugs into Relay SERVICE CONT Compressor ContBLU/BLK GRN WHI 230V shown SERVICE CONT Compressor JDF-4SBBRN from Capacitor SERVICE CONT Compressor ContBLU/BLK BLU from CapacitorRED/BLK BLK SERVICE CONT Compressor Switch all ModelsFIG. 19 COMPRESSOR SWITCH LocationBLU/BLK SERVICE CONT Condenser Fan all ModelsFIG. 21 CONDENSER FAN LocationSERVICE CONT Control Board, Main all Models Disconnect the dispenser from the power source SERVICE CONT Portion Control Board JDF-2S,4SFIG. 28 CONTROL BOARD CONNECTORS SERVICE CONT Push Button Control Board JDF-4DPortion Control Board JDF-4D SERVICE CONTSERVICE CONT Circulation Pump all Models FIG. 33 DISPENSE PLATFORM SWITCH SERVICE CONT Dispense Platform Switch all ModelsSERVICE CONT Dispense Pump all Models except JDF-4D FIG. 37 DISPENSE MOTOR SERVICE CONT Dispense Motor all ModelsFIG. 38 DISPENSE MOTOR CONNECTORS #3 WHI/VIO Dispense Station #4 WHI/ORN YEL to Control Board SERVICE CONT Dispense Valve all ModelsFIG. 39 DISPENSE VALVE Dispense Station #1 WHI/VIOP1449 SERVICE CONT Dispense Switches JDF-2S, JDF-4SSERVICE CONT Cold Water Dispense Switch JDF-4S only Location SERVICE CONT Dispense Membrane Switch all ModelsFIG.47 MEMBRANE SWITCHES FIG. 48 MEMBRANE SWITCHSERVICE CONT Cold Water Dispense Membrane Switch all ModelsJDF-4S shown SERVICE CONT EMI Filter all ModelsFIG. 49 EMI FILTER FIG. 52 LAMP HOLDERS SERVICE CONT Lamps, Holders and Ballasts Early ModelsFIG. 51 LAMPS & HOLDERS SERVICE CONT LED Lamps JDF-2S, JDF-4S FIG. 55 RECTIFIER Rectifier JDF-2S, JDF-4SSERVICE CONT FIG. 57 RELAY Relay all ModelsSERVICE CONT FIG. 59 RESISTOR Resistor all 230V ModelsSERVICE CONT FIG. 62 COLD WATER SOLENOID SERVICE CONT Solenoid - Cold Water JDF-4S onlyWHI/VIO to Control Board WHI to Control BoardBRN to Control Board SERVICE CONT Solenoid - Inlet all ModelsVOLTAGE SERVICE CONT Temperature Probe all ModelsTEMP RESISTANCERESISTANCE SERVICE CONT Temperature Sensor all ModelsFIG. 67 TEMPERATURE SENSOR TEMPto Control SERVICE CONT Transformer all ModelsWHI/BLU to Control Board J6-1,J12-1WHI - 120V T2, 240V T6 SERVICE CONT Transformer - Lited Doors JDF-2S, JDF-4SWHI/GRN - T8 WHI/BLK - T12Station Triac MapStation Station2 WIRE DIAGRAM for JDF-2S LED Lited DoorsSCHEMATIC WIRING DIAGRAM JDF-2S ELECTRICAL SCHEMATIC Models withDIAGRAM JDF-2S ELECTRICAL SCHEMATIC DIAGRAM for JDF-2SModels with Flourescent Lited Doors SCHEMATIC WIRINGSINGLE PHASE ELECTRICAL SCHEMATIC DIAGRAM for JDF-4S Models with LED Lited DoorsSCHEMATIC WIRING DIAGRAM JDF-4S 2 WIREModels with Flourescent Lited Doors ELECTRICAL SCHEMATIC DIAGRAM for JDF-4SSCHEMATIC WIRING DIAGRAM JDF 2 WIRE SINGLE PHASE2 WIRE ELECTRICAL SCHEMATIC DIAGRAM for JDF-4DPress & Release Models SCHEMATIC WIRING DIAGRAM JDF-4DSINGLE PHASE ELECTRICAL SCHEMATIC DIAGRAM for JDF-4D Portion Control ModelsSCHEMATIC WIRING DIAGRAM JDF-4D 2 WIRESINGLE PHASE ELECTRICAL SCHEMATIC DIAGRAM for JDF-4S-SBSCHEMATIC WIRING DIAGRAM JDF-4S-SB 2 WIRE