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Old 04-05-2012, 10:04 PM   #16
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Air Compressor Won't start


The part number on the magnetic starter is
ST122010AJ

It looks like I can get a replacement magnet coil (?) or whatever it's called on ebay for about $25

The whole magnetic starter is about $130ish.

Should I take this one apart to see what's going on with it?

or should I just run the #10 wire to see if that helps? if it's getting 230 volts but not enough amps, would that prevent the magnetic starter from engaging? It seems like the starter would try to engage and then trip the breaker if there was a problem with the wire being too small.

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Old 04-06-2012, 06:52 AM   #17
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Air Compressor Won't start


When I asked for the starter number, I was thinking of trying to find a schematic for it, but two things occurred to me later; there is most likely a schematic inside the enclosure, so you could check that if you wish, but, on the other hand, it did start once, and I assume that it came prewired, so, unless you took something apart for some reason, that is probably a moot point. The only thing that I can think of at this point, other than the coil, is the pressure switch. You have two wires going into the pressure switch, correct? Turn the power off, put both of those wires under one of the terminals, thereby bypassing the pressure switch, and see if it starts. Do not leave it run this way, as doing so would result in serious mechanical damage to the compressor itself, as well in potential damage to things around it, as well as personal injury. However, nothing bad should happen if you were to simply switch it on, let it run for 5-10 seconds, to see if the problem is in the pressure switch, then shut it off. If that does not pan out, then yes, I would order a coil, although you may want to remove it first, just to confirm that none of the internal wires are loose or damaged. As for the undersized wiring, I doubt it is a contributor to a bad coil, nor to it not starting, but, again, take care of that, because it is a very serious concern as far as something much more serious, like in fire.
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Old 04-06-2012, 08:45 AM   #18
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Air Compressor Won't start


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Originally Posted by DexterII View Post
You have two wires going into the pressure switch, correct? Turn the power off, put both of those wires under one of the terminals, thereby bypassing the pressure switch, and see if it starts.
Stop. I just remembered that you said you had 220 volts at the pressure switch, so, with that in mind, I assume that you have 4 wires in the pressure switch; 2 hot, probably coming from L1 and L2, and two that run back to the coil, perhaps connected to A1 and A2? If this is the case, you want to pair the wire from L1 with the one going to A1 or A2, and the one from L2 with the remaining wire going to A1 or A2. Do not pair the wires from L1 and L2, as that would obviously give you a dead short.
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Old 04-06-2012, 10:07 PM   #19
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Air Compressor Won't start


Thank you for all the help. I have decided to sell it and get a smaller unit.
My main problem is that I have a #10 wire supplying my shop, so I'd have to rerun the whole shop wiring to be able to use this compressor. I'm thinking that a 3 or 5hp compressor will meet my needs better.

I have determined that there is nothing wrong with the compressor, but from the manufacturer literature that i found onine, the probable issue is a wire that is too small will keep the magnetic starter from activating.
bingo

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