SERVICE (cont.)

THERMAL FUSES (230V-CE MODELS ONLY)

 

 

 

J2

 

 

J1

 

 

 

 

 

 

2

1

 

 

3

TL

 

4

TL

 

L5

TL

 

 

TL

 

 

 

T

 

 

 

 

FIG. 28 THERMAL FUSES

 

P1750.65

 

 

Location:

The thermal fuses are mounted on the tank heater terminals and the contactor terminals.

Test Procedures:

1.Disconnect the brewer from the power source.

2.Disconnect the thermal fuse from the tank heater terminal and the contactor terminal.

3.Check for continuity across the terminals on the ends of the thermal fuse.

If continuity is present as described, the thermal is operating properly.

If continuity is not present as described, replace the thermal fuse.

Removal and Replacement:

1.Disconnect the thermal fuse from the tank heater terminal and the contactor and discard.

2.Connect the new thermal fuse to the tank heater terminal and the contactor terminal.

TIMER (Early Models)

OLD STYLE

 

FIG. 29 TIMER

P1722.55

 

Location:

 

The timer is located on the front center of the component bracket.

Test Procedures:

1.Disconnect the brewer from the power source.

2.Disconnect the polarized, three pin connector from the brewer main harness and rotate the brew timer dial fully counterclockwise.

3.With a voltmeter, check the voltage across sockets P2 and P3 (white and black wire or red wire) of the female connector on the main wiring harness when the "ON/OFF" switch is in the "ON" (upper) position. Connect the brewer to the power source. The indication must be:

a)120 volts ac for three wire 120/208 volt, 120/240 volt, 380 volt models and 208 or 240 volts ac for four wire 440 volt models.

b)208 volts ac for two and three wire 208 volt models.

c)240 volts ac for two and three wire 240 volt models.

d)230 volts ac for two wire 230 volt CE models.

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 Diagrams and check the brewer wiring harness.

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080900

 

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Bunn U3A service manual Thermal Fuses 230V-CE Models only, Timer Early Models

U3A, U3 specifications

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