230v Compressor Wiring

[andgott]

I've got an older compressor that I'm swapping the tank on (the old one leaks ), and while I'm at it I want to rewire it for 230v since my new shop has it available. Right now, it's wired for 115v.

The pressure switch is wired like this at the moment-

Line comes in on left, HOT and NEUTRAL go through switch. I'd assume that when I rewire it, I will run both hots through the switch- There would be no real reason to disconnect the neutral?

Also, there is NO GROUND connected- That will change!

Now- on to the motor- Here's how it looks now-

the HOT line is connected to A, which is 'jumped' to D.

There is nothing connected to B, Which is jumped to E.

The Neutral is connected to C.

This is an older Westinghouse 3/4 hp motor, and I can't find a wiring diagram for it- How do I wire this? Thanks!

-Andrew

 

[G_P]

No offense but why bother rewiring a 3/4hp motor to 240v? Even at 120 it wont draw enough amps to be a problem.

If I were you I would put a grounded cord on it and make sure the ground is attached inside the pressure switch and call it a day.

 

[Jtcrep]

+1. Going to 220 doesn't make sense.

 

[kamesama980]

We have 120/240v here in the states.

I'm running everything I can in the garage 240v cuz I can. Doesn't affect speed or power any though, just so you know. just cuts down the amps you're pulling.

As for practical solution...I could guess but it's probably more likely to let the magic smoke out than work.

 

[andgott]

No offense but why bother rewiring a 3/4hp motor to 240v? Even at 120 it wont draw enough amps to be a problem.

Mainly because I have the 240v dedicated circuit available, and not being used, and since i'm removing and rewiring the entire compressor while moving it to the new tank, it's not going to cost me any more to wire it to 240. With it on the dedicated circuit, I can run whatever I need to on the 120v outlets without worry.

Since I HAVE the 240, Might as well use it. I know it doesn't improve anything other than cut down on the amperage draw, but it's there, I already paid for it, why not use it?