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

 

Page 47
Image 47
Bunn JDF-4D, JDF-4SB manual Temperature Sensor all Models, 32 F 5k Ω, 77 F 350 Ω

JDF-4D, JDF-4SB, JDF-4S specifications

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