Bunn H10X service manual Service Limit Thermostat, Test Procedure

SERVICE (cont.)

Limit Thermostat

Limit Thermostat

Location:

The limit thermostats are located on the tank lid. To test the limit thermostats, access will also be needed to the terminal block located on the side of the dis- penser.

P1993

FIG. 5 LIMIT THERMOSTAT

Test Procedure:

1.Disconnect the dispenser from the power source.

2.There are two black wires on the limit thermostat terminals. One comes from the terminal block. The other goes directly to the tank heater terminal. Re- move the black wire at the limit thermostat coming from the terminal block.

3.Check the voltage across the black wire removed from the limit thermostat and the red wire of the terminal block with a voltmeter. Connect the dis- penser to the power source. The indication must be 200 to 240 volts ac for 200 to 240 volt models.

4.Disconnect the dispenser from the power source.

If voltage was present as described, reconnect the black wire and proceed to #5.

If voltage was not present as described, refer to the Wiring Diagrams and check the dispenser wiring har- ness.

5.Check for continuity across the terminals of the limit thermostat.

If continuity is not present as described, the circuit is broken. Press the reset button of the limit thermostat and recheck for continuity.

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

Removal and Replacement:

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

2.Remove the two #10-32 nuts attaching the limit thermostat to the top of the tank.

3.Install the new limit thermostat and secure into place with two #10-32 nuts.

4.Refer to FIG. 6 when reconnecting the wires.

BLK to Terminal Block

Reset

BLK to Tank Heater

P1776

FIG. 6 LIMIT THERMOSTAT WIRING

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