Central Pneumatic 47065 blows breaker

by Tom K
(Lexington, TX)

The tank is empty.

When turned on the unit will hum and blow the breaker if not turned off within a few seconds.

Both of the capacitors have been checked and appear to be OK.

If there is an inertia/capacitor switch in this unit it is well hidden so I do not understand how the start capacitor is cycled.

Any suggestions?

Tom K.

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Jul 19, 2016
breaker trips
by: Doug in s.d.ca

Centrifugal switch may be on the pump end of the motor.

Did you check both caps? Some times, both are affectively in circuit at start, so the run cap can also cause bad start.

Jul 19, 2016
Plugged in
by: Tom K

It is on a plug 2 feet from the 20 amp breaker and no extension cord.

It has been working there for ten years or more.

The capacitor checks out with an Ohm meter. I can get a friend to check it with a meter for capacitors.

The breaker runs a medium size AC unit with no problems.

I do not run them at the same time ie only one is plugged in at a time.

On line videos demonstrate an inertia/capacitor switch in compressors. I am not an electrician and can be ignorant at times but usually not stupid. I cannot find anything resembling an inertia/capacitor switch on this unit.

Jul 18, 2016
47065 blows breaker
by: Bill

What is the amperage of the breaker the compressor is plugged into?

Am I correct in assuming that you are not using an extension cord?

Humming motors suggest that it cannot roll over, so the inrush current is suspect, which suggests the start cap may still be the issue.

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