Bunn TB3Q-LP Limit Thermostat, Remove the blue/black wire from the limit ther- mostat

SERVICE (cont.)

LIMIT THERMOSTAT

P3047

FIG. 8 LIMIT THERMOSTAT

Location:

The limit thermostat is located inside the hood on the tank lid.

Test Procedure:

1.Disconnect the brewer from the power source and remove the black wire from the limit thermostat.

2.With a voltmeter, check the voltage across the black wire removed from the limit thermostat and the white wire or red wire on the tank heater ter- minal. Connect the brewer to the power source. The indication must be:

a)120 volts ac for two wire 120 volt models.

b)230 volts ac for two wire 230 volt models.

c)100 volts ac for two wire 100 volt models.

3.Disconnect the brewer from the power source.

If voltage is present as described, reconnect the black wire and proceed to #4.

If voltage is not present as described, refer to the Wir- ing Diagrams and check the wiring harness.

4.Remove the blue/black wire from the limit ther- mostat.

5.With a voltmeter, check the voltage across the ex- posed terminal of the limit thermostat and the white wire from the power cord or the red wire from the power connector. Connect the brewer to the power source. The indication must be:

a)120 volts ac for two wire 120 volt models.

b)230 volts ac for two wire 230 volt models.

c)100 volts ac for two wire 100 volt models.

6.Disconnect the brewer from the power source.

If voltage is present as described, reconnect the blue/ black wire to the limit thermostat. The limit thermo- stat is operating properly.

If voltage is not present as described, replace the limit thermostat.

Removal and Replacement

1.Remove both wires from the limit thermostat ter- minals.

2.Carefully slide the limit thermostat out from un- der the retaining clip.

3.Carefully slide the new limit thermostat into the retaining clip.

4.Refer to Fig. 9 when reconnecting the wires.

BLU/BLK to

Control

Thermostat

BLK to Power Cord or

Power Connector

P1800

FIG. 9 LIMIT THERMOSTAT TERMINALS

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