Bunn SA, STA, STFA service manual SERVICE cont WARMER ELEMENTS

Models: SA STFA ST STA STF

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SERVICE (cont.)

SERVICE (cont.)

WARMER ELEMENTS

Location:

The warmer elements are located under the warmer plates.

P1601

FIG. 22 WARMER ELEMENTS

Test Procedures:

1.Disconnect the brewer from the power source.

2.Use the WHI wire to the terminal block and the wire from the warmer element to the "ON/OFF" switch.

3.Check voltage across the WHI wire from the terminal block and the wire from the "ON/OFF" switch to the warmer element with a voltmeter with the "ON/OFF" switch in the "ON" position. The indication must be:

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

b)120 volts ac for three wire 120/208 volt versions or 120/240 volt versions.

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 wiring diagrams and check brewer wiring harness.

5.Check the continuity across the two terminals on the warmer element.

If continuity is present as described, reconnect the wires on the warmer element.

If continuity is not present as described, replace the warmer element.

Removal and Replacement:

1.Remove the three #4-40 screws securing the warmer assembly to the brewer.

2.Lift the warmer assembly from the brewer.

3.Disconnect the two wires from the warmer ele- ment terminals.

4.Remove the two #8-32 nuts securing the warmer element to the warmer plate.

5.Securely install new warmer element.

6.Reconnect the two wires to warmer element terminals.

7.Securely install warmer assembly on the brewer.

8.Refer to FIG. 23 when reconnecting the wires.

BRN/BLK Wire to Top Front Warmer Switch

BLU/BLK Wire to Top Rear Warmer Switch

WHI Wire to Terminal Block (White Insert on 120/208V or 120/240V Models) or

RED Wire to Terminal Block (Red Insert on 200V or 240V Models)

WHI/VIO Wire to Lower Warmer/ON Switch

WHI Wire to Terminal Block (White Insert on 120/208V or 120/240V Models) or

RED Wire to Terminal Block (Red Insert on 200V or 240V

Models)

P1602

FIG. 23 WARMER ELEMENT TERMINALS

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29251 052500

 

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Bunn SA, STA, STFA service manual SERVICE cont WARMER ELEMENTS