Contactor - Bunn H5X Service & Repair Manual

SERVICE (cont.)
Contactor (H5M Only)
FIG. 13 CONTACTOR
Location:
The contactor is located on the component
bracket inside the lower rear panel.
Test Procedures:
1. Disconnect the dispenser from the power source.
2. Disconnect the black wire from the contactor coil
to the limit thermostat and black wire from the red
wire on the main harness on two wire 240V models.
3. Check the voltage across the red wire and black
wire with a voltmeter. The indication must be:
a.) 240 volts ac for 240 volt models,
b.) 230 volts ac for 230 volt models.
4. Disconnect the dispenser 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 wiring harness.
5. 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 #6
If continuity is not present as described, replace the

contactor.

6. Check the voltage across the upper left terminal
and the upper right terminal on the contactor with
a voltmeter. Connect the dispenser to the power
source. The indication must be:
a.) 240 volts ac for 240 volt models,
b.) 230 volts ac for 230 volt models.
7. Disconnect the dispenser from the power source.
P1785 If voltage is present as described, proceed to #8.
If voltage is not present as described, refer to the wiring
diagrams and check the wiring harness.
8. Check for continuity across the terminals on the
left side of the contactor by manually closing the
contacts. Continuity must not present when the
contact is released.
9. 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.
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