Wire this old compressor from 110v to 220v.

by Dan
(Hartland WI)



Wire this old compressor from 110v to 220v

I need to know how to wire this from 110v to 220v.


I was told it was a variable voltage motor and it runs on 110v fine.

I don't know much because the nameplate faded into Oblivion. Any help would be great.

Comments for Wire this old compressor from 110v to 220v.

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May 19, 2017
Negative:
by: Doug in s.d.ca.

"There is 3 wires in 220v. 2 hots & neutral.. where do I put the third wire?"

Actually, there are two (hot) plus a ground (as distinguished from Neutral).

One of the terminals will be marked either GND or maybe three or so parallel lines of different lengths like a pine tree with the 'trunk' extending from the widest line.

On your motor, I can't see the ground marking. But it looks like the black and white are where the 110 is, and those are where the 220V hot wires go. The middle one is likely ground, but looks like it's not hooked up. Your bare or green wire in the cord should be connected to ground and the middle terminal on the motor.

If you have a meter, you should see zero ohms from the middle terminal to the metal case of the motor, and infinity to the other two. If that's not what you see, please come back with what you found.

May 19, 2017
Wiring
by: Dan

There is 3 wires in 220v. 2 hots & neutral.. where do I put the third wire?

May 18, 2017
110 > 220
by: Doug in s.d.ca.

Yes. But there is a 4 to 1 power reduction.

With an oversize motor it will sometimes work in a given application.

I'm sure yours works fine at 220 as that's what it's made for.

May 18, 2017
Plate
by: Anonymous

I can read on the plate very vaguely that it says 230V in one box and 9A next to it. Can a 230V motor be run on 110V without changing wiring?

May 18, 2017
110 > 220
by: Doug in s.d.ca.

Unless there's another plate with wires inside, it's not likely.

It's theoretically possible to build one that will work on both voltages without modifications, but as far as I know, there's not such a thing on the market. Haven't needed one.

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