220 with a single hot wire??

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  #1  
Old 03-01-07, 07:35 PM
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220 with a single hot wire??

I just picked up a new air compressor. It is 220v single phase and the cord coming off of it has three wires: a single hot a neutral and a ground. How can I hook this thing up as 220 lines have 2 110v hot wires??? Any help would be much appreciated.

Brian
 
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Old 03-01-07, 07:45 PM
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What's the manual say? If it's pure 220 you may not have a neutral. What color are the wires?
 
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Old 03-01-07, 07:48 PM
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What you are calling a neutral is the second hot. There is no neutral on a 240v only piece of equipment such as a motor.

Edit: Wire color may not be indicitive of wire function if standard 3 conductor cablesuch as SO containing black, white green was used.
 
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Old 03-01-07, 07:51 PM
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Agreed.

What you have is two hots and a ground.
 
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Old 03-01-07, 07:51 PM
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The wires are Black (hot) White (neutral) and Green (ground) and have stickers labeling them as such. I am thinking it is possible that the white wire is mislabeled and is in fact the second hot from looking at the wiring diagram in the back of the manual which is not very good and doesn't say much other than make sure it is grounded and to put oil in it. I'll copy and post the wiring diagram in a minuet.
 
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Old 03-01-07, 07:56 PM
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check to be sure the motor is not convertable voltage. If it can be wired 120v the labeling would be correct. As others posted, if it uses 240v, the neutral would be used as a second hot.
 
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Old 03-01-07, 08:15 PM
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Here is the wiring diagram from the manual

The white wire actually has a sticker on it labeling it neutral, but I am thinking that this label is likely incorrect. The unit is not convertible voltage it is purely 220.
 
  #8  
Old 03-01-07, 08:23 PM
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There are many situations where the white wire is not a neutral. Assuming that white is always neutral is the source of many errors by homeowners.

For a European compressor, you would have one hot and one neutral. If this compressor is not manufactured for use in the U.S., and you are in the U.S., then don't use it. Return it and get a U.S. compressor.
 
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Old 03-01-07, 08:55 PM
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Originally Posted by John Nelson View Post
There are many situations where the white wire is not a neutral. Assuming that white is always neutral is the source of many errors by homeowners.
I was just going off what the label on the wire said... It is made for US use by Central Pneumatic.
 
  #10  
Old 03-01-07, 09:41 PM
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The white wire was in fact labeled wrong and was the second hot wire. Its up and running now. Thanks for all the input.
 
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