Bunn SRU Guía Del Usuario

Page 15

SERVICE (cont.)

Location:

The contactor is located inside the front lower ac-

cess panel, left of center on the component bracket.

Test Procedures:

1. Disconnect the brewer from the power source.

A. 10/08V and 10/40V THREE WIRE MODELS

Disconnect the black wire from the contactor coil

to the limit thermostat and black wire from the

white wire on the main harness.

B. 08V or 40V TWO WIRE MODELS, 08V and

40V THREE WIRE MODELS

Disconnect the black wire from the contactor coil

to the limit thermostat and black wire from the red

wire on the main harness.

C. 30V MODELS

Disconnect the red wire from contactor coil to the

limit thermostat and the black wire from the main

harness.

3. Connect the brewer to the power source.

4. Check the voltage across the limit wire and the

wire from the the main harness.The indication

must be:

a) 10 volts for 10/08 and 10/40 volt, 3-wire

with ground, single phase;

b) 30 volts for 30 volt, -wire with ground, single

phase;

c) 08 volts for 08 volt, -wire with ground, single

phase;

d) 40 volts for 40 volt, -wire with ground, single

phase.

10067 040100

5. Disconnect the brewer from the power source.

If voltage is present as described, proceed to #6.

If voltage is not present as described refer to the Wiring

Diagrams and check the brewer wiring harness.

6. Check for continuity between the black leads on

the contactor coil or the left and right terminals

on the contactor coil on 30 volt models.

If continuity is present as described, reconnect the

wires and proceed to #7.

If continuity is not present as described, replace the

contactor.

7. On all brewers check the voltage across the upper

left terminal and the upper right terminal on the

contactor with a voltmeter. Connect the brewer to

the power source. The indication must be:

a) 10 volts for 10/08 and 10/40 volt, 3-wire

with ground, single phase;

b) 30 volts for 30 volt, -wire with ground, single

phase;

c) 08 volts for 08 volt, -wire with ground, single

phase;

d) 40 volts for 40 volt, -wire with ground, single

phase.

8. Disconnect the brewer from the power source.

If voltage is present as described, proceed to #9.

If voltage is not present as described, refer to the wiring

diagrams and check the brewer wiring harness.

9. Check for continuity across the terminals on the

left side of the contactor by manually closing the

contacts. Continuity must not be present when the

contact is released.

10. Check for continuity across the terminals on the

right side of the contactor by manually closing the

contacts. Continuity must not be present when the

contact is released.

If continuity is present as described, the contactor is

operating properly.

If continuity is not present as described, replace the

contactor.

P08.40

FIG. 4 CONTACTOR

CONTACTOR

SET