Bunn VPR APS SERVICE cont, BLK to Terminal Block BLU/BLK to Limit Thermostat or Thermal Cut-Off

SERVICE (cont.)

Location:

The control thermostat is located inside the hood on the left end of the mounting bracket.

Test Procedures:

1.Disconnect the brewer from the power source.

2.Locate the black wire on the control thermo- stat.

3.Check voltage across the black wire on the control thermostat and the white wire on the tank heater with a voltmeter. Plug-in the brewer to the power source. The indication must be 120 volts ac.

4.Disconnect the brewer from the power source.

If voltage is present as described, proceed to #5.

If voltage is not present as described, refer to the wiring diagram and check the brewer wiring harness.

5.Locate the blue/black wire on the control ther- mostat.

6.Gently remove the capillary bulb and grommet from the tank.

7.Check voltage across the blue/black wire of the control thermostat and the white wire on the tank heater with a voltmeter when the control thermostat is turned "ON" (fully counterclockwise for thermostat with tee handle control or fully clockwise for thermostats with control knob). Plug-in the brewer to the power source. The indication must be 120 volts ac.

Voltage must not be present across these terminals when the thermostat is turned "OFF" (fully counter- clockwise).

8.Disconnect the brewer from the power source.

If voltage is present as described, reinstall the capillary tube into the tank to the line 4.5" above the bulb, the control thermostat is operating properly.

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

Removal and Replacement:

1.Remove wires from control thermostat leads or terminals.

2.Remove the thermostat capillary bulb by firmly pulling-up on the capillary at the tank lid. This will disengage the grommet from the tank lid.

BLK to Terminal Block

BLU/BLK to Limit Thermostat or Thermal Cut-Off

P1252

FIG.4 CONTROL THERMOSTAT TERMINALS

3.Remove two #8-32 screws securing the control thermostat to the mounting bracket inside the hood.

4.Slide the grommet to the line 4.5" above the bulb on the new capillary tube.

5.Insert the capillary bulb 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.

6.Carefully bend the capillary tube so that the tube and bulb inside the tank are in the vertical posi- tion.

NOTE - The capillary tube must be clear of any electri- cal termination and not kinked.

7.Using two #8-32 screws secure the control thermostat to the mounting bracket inside the hood.

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

9.Adjust the control thermostat as required

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