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

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