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Old 10-07-2015, 08:56 PM   #21
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You are wrooooong.

If you change the leads on the start capacitor it will run backwards, the motor placard clearly depicts this. The two hots are identical to each other, inversely, sixty times a second. How can reserving that make it spin backwards?
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Old 10-07-2015, 08:57 PM   #22
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Quote:
Originally Posted by Erat View Post
It could be split phase.

Either way, it could have a cap. It still doesn't matter, if you change the leads on the motorthen it will run the opposite way.
And you're absolutely right, if he doesn't touch it, no matter what hot gets what it will run the proper way. Since a shop already had it setup and running at one time.
It is split phase, specifically single phase 240V.

It for sure has as starting cap, wouldn't start without one.

And yes if he hooks the two hots and nuetral up it will work, motor was setup the correct direction when it was wired up as you say.
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Old 10-07-2015, 09:02 PM   #23
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Quote:
Originally Posted by deezums View Post
You are wrooooong.

If you change the leads on the start capacitor it will run backwards, the motor placard clearly depicts this. The two hots are identical to each other, inversely, sixty times a second. How can reserving that make it spin backwards?
I know this.

How am i not making myself clear?
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Old 10-07-2015, 09:05 PM   #24
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I have changed the plug twice now.moving it different places. Replacing the 6-20 plug with a 6-30 plug won't do jack if the wiring behind it is still 12 gauge.
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Old 10-07-2015, 09:06 PM   #25
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Bottom line.

He needs this:



The machine should already have this on it. All is see is the back of it in the picture.

He needs the female end of this wired into a box in his house. Two hots and a ground.

If this is done then you SHOULDN'T need to check rotation. I would still check, but whatever do what you want it's not mine.

If you hook up a 6-20 male plug and get into the pecker head. Then good luck.
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Old 10-07-2015, 09:06 PM   #26
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I don't know, you seemed confused about the existence of the cap so I wanted to be sure.

Most compressors I've messed with have terminal blocks on the pressure switch. That should be all he needs to hook up, and it doesn't matter which gets which.

Everything more complicated happens past that terminal block, so don't reverse the leads inside the motor to the terminal block and all is well.
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Old 10-07-2015, 09:18 PM   #27
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Quote:
Originally Posted by aidandj View Post
Replacing the 6-20 plug with a 6-30 plug won't do jack if the wiring behind it is still 12 gauge.
That is just the rating of the plug.

Split the difference and put a 25a breaker in. It'll be fine.

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Old 10-07-2015, 09:20 PM   #28
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Does this help?













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Help me hook up my air compressor-oj34wv6.jpg   Help me hook up my air compressor-obv4rsw.jpg   Help me hook up my air compressor-bwtdrjv.jpg   Help me hook up my air compressor-fwibx8a.jpg   Help me hook up my air compressor-5q1dd6n.jpg  

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Old 10-07-2015, 09:20 PM   #29
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oops
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Help me hook up my air compressor-oj34wv6.jpg   Help me hook up my air compressor-obv4rsw.jpg   Help me hook up my air compressor-bwtdrjv.jpg   Help me hook up my air compressor-fwibx8a.jpg   Help me hook up my air compressor-5q1dd6n.jpg  

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Old 10-07-2015, 09:25 PM   #30
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Check what gauge wires you have in the wall and what the breakers are. That motor pulls 22A when it's running, your wiring in the house/garage/box may not be beefy enough.
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Old 10-07-2015, 09:27 PM   #31
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Yeah. Which is why i don't even suggest the 6-20 plug.
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Old 10-07-2015, 09:28 PM   #32
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Its 12v wire. Need to see what breaker it is on.
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Old 10-07-2015, 09:31 PM   #33
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Quote:
Originally Posted by aidandj View Post
Its 12v wire. Need to see what breaker it is on.
Assuming you meant 12 gauge wire, then yeah, no dice on that.
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Old 10-07-2015, 09:34 PM   #34
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Measuring voltage without the compressor running won't really tell you much either. You should watch it while the thing is trying to start and run both, assuming it even will start/run without blowing the breaker. That's what will damage the compressor.

I think most the people here are optimistic thinking it doesn't run near full load amps when it runs, so I don't think you'll be too successful no matter what you do. This style compressor runs 100% wide open while it runs, but then it shuts off for a duty cycle dependent on how fast you drain it.

In other words, it's 25A for starting or bust, with 22A for run.

I also think you can adapt whatever modern motor frame you want to that compressor, it's really not that complicated.
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Old 10-07-2015, 09:36 PM   #35
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Yeah and since you don't own the place, it wouldn't be safe to go violating code.

You may be able to talk them into running flexible metal conduit to a location with a box of your choosing.


I wonder how hard it would be to put a 110v motor on.
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Old 10-07-2015, 09:39 PM   #36
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Well I have the plug so I'm going to give it a shot. Then I'll call the landlord if it doesn't work.
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Old 10-07-2015, 09:42 PM   #37
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What's the bet?

I got $10 that says it works.
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Old 10-07-2015, 09:52 PM   #38
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Quote:
Originally Posted by Erat View Post
What's the bet?

I got $10 that says it works.
For sure if you give it power it will work. The question is, will the breaker trip before the wire catches on fire?
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Old 10-07-2015, 09:53 PM   #39
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I just learned something new, some manufacturers have different rated beakers for different inrush current loads, basically different trip characteristics.

That's probably a AC plug, why else would it be outside? It's probably got an inductive load curve breaker, for motors.

There's another curve that apparently tolerates inrush currents for longer, but apparently it can damage inductive loads like motors allowing them to operate outside spec for longer than necessary.

Since it has a AC compressor breaker, or probably the standard residential "c" curve breaker, you might be able to switch to the "d" curve breaker. It would still pop at 12gauge safe levels, but it might be the extra bit it needs to get running if it won't now.
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Old 10-07-2015, 09:53 PM   #40
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I'll check the breaker next. If its a 20amp then I'm not worried. If its a 40amp breaker I'm going to ask for new wire.
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