double pole 20amp breaker on my compressor keeps tripping,

by Scott Lucas
(Portland, Or)

I hard wired it with 10-2 awg, a disconnect above unit. Black/Red to the breaker. Green to ground. The breaker trips immediately, do I need a 30 amp? Unit is 60 gal, 16amp., 5 hp.

I have wired all my own in the past. Should I go green to neutral since they may be a 120v circuit internally? Does it really need a ground OR both?

Scott
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It is posted, Scott. I hope that we get an electrically oriented visitor to provide a response to you. I don't do electrical advice.

B.

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why do I have to keep hitting the reset button on the starter

by Jeff l
(Fort lauderdale fl. )

Every few cycles i have to reset the mag starter.
The hotter it is outside the more it happens.

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Bill says...

Jeff, it sounds like your motor is overheating and it's clicking off on thermal overload.

Could be a motor issue, could be added load from a mechanical issue in the compressor.

Make sure that you've got a "clean" line in terms of power supply. Low voltage might overheat the motor too.

Cheers,

Bill

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Compressor keeps cutting off before desired set pressure is reached.

by Brian Parrish
(Rocky Mount, NC , USA)

Air compressor cuts off , tryed by-passing pressure switch and main switch, compressor would run only about a minute, then cut off, could this be a capacitor problem?

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Bill says...

Hello Brian. Good on you for bypassing the pressure switch and proving that it isn't your pressure switch that is cause the compressor problem you describe.

Reasons why a compressor motor will shut off before the compressor reaches cut out pressure. Lots of info on the pages linked from page "will not build pressure".

If you are using an extension cord, lose it, and then see what happens. Make sure no other device is pulling power from the air compressor circuit when it's starting, or even when running, if possible.

Does the motor start to lug before it stops, or does it just quit?

It might be going off on thermal overload, or it might be a capacitor or motor problem.

If you've got clean and plentiful power to the compressor and it won't run, time to get the capacitor / motor checked I would say.

Cheers,

Bill

Comments for Compressor keeps cutting off before desired set pressure is reached.

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Apr 29, 2011
Air compressor
by: Brian

Thanks Bill for the advise, got home from work the other day and drained all remaining air from tank, plugged in power, compressor pumped up to 150psi, and cut off, released air, had regulator set at 115psi, when it reached 115psi, pump started back up and pumped up to 150psi before stopping. Tryed this several tims to ensure proper operation. Maybe there was some trash in the regulator header or the line causing my problems. Seems to be working fine now. Again thanks for your help.

Brian

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You are very welcome. Glad to be of what little help I was.

Have a good one.

Bill


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thermal cut out, reason, if reset how long last the same compressor?

by miguel soliz
(united states)

Found a reciprocrating compressor in thermal cut out due by lack of refrigerant, copressor body overheated, ohmed out C-S= OL, C-R:= OL, S-R 5.4 MOHMS, GROUND CONTINUITY OL between tree windings and compressor body. How long can last if compressor resets. 10 years old heat pump system...

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Bill says...

Miguel, I don't have any info for you about air conditioning compressors. Sorry.

Maybe a reader can post a comment for you?

Cheers,

Bill

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