Contactor - Bunn SRUA Operating & Service Manual

SERVICE (cont.)

CONTACTOR

FIG. 2 CONTACTOR
Location:
The contactor is located inside the front lower
access panel, left of center on the component bracket.
Test Procedures:
1. Disconnect the brewer from the power source.
2 Disconnect the red wire from contactor coil to the
control thermostat and the black wire from the
contactor coil to the main harness.
3. Connect the brewer to the power source.
4. Check the voltage across the control thermostat
wire and the wire from the the main harness.The
indication must be 230 volts ac.
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 Diagram and check the brewer wiring harness.
6. Check for continuity between the left and right
terminals on the contactor coil.
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 230
volts ac.
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 diagram 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.
P2211.40
Removal and Replacement:
1. Disconnect all the wires from the contactor.
2. Remove the two #8-32 screws securing the
contactor to the contactor mounting bracket.
3. Install new contactor and secure with two #8-32
screws.
4. Refer to Fig. 3 and reconnect the wires.
BLK to Main Har-
ness
BLK Thermal
Fuse to Tank
Heater
RED Thermal Fuse
to Tank Heater
FIG.3 CONTACTOR TERMINALS
Page 14
BLK to Terminal
Block (L2)
RED to Terminal
Block (L1)
RED to Control
Thermostat
P1725.50
10067.3 070102