voltage help needed...

atlanta39May 19, 2010

hi guys,

Im in the process of converting a furnace blower to a work shop fan. The furnace has these specs..200/230 volts 3 speed.etc.. My question is i would like to convert this motor to a 115 volt where i can you use regular house voltage to power it. Can this be done..I know a 230 volt has 2 power hot wires. how ,if possible,can i convert this to 115 to wire to a regular extension cord and outlet..thanks

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You can leave the fan as is and run a 220/230/240 line to the workshop. It's the same type of line as an electric range or electric dryer so you have it in the house. Or check out the link.

Here is a link that might be useful: 220 on 110 lines

    Bookmark   May 19, 2010 at 2:59PM
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i was hoping to just wire it differently if possible..

    Bookmark   May 19, 2010 at 3:20PM
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There are too many variations to give you a definative answer. I've tried trial and error, but error resulted in a smoking piece of junk.
Some motors have alternative wiring schemes on the inside of their electrical connection cover plate. If it's not there, you might try taking it to a motor repair shop for them to look at.

    Bookmark   May 19, 2010 at 3:33PM
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it shows a varaition to make it 200 but not 115.. i have wiring diagrami can post if that helps

    Bookmark   May 19, 2010 at 4:02PM
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It may not be doable on yours, then. If you can find a motor shop, they might know a way.
If you know of a local company that installs replacement furnaces, they might have an old 115v fan in their junk pile. (I got two that way)

    Bookmark   May 19, 2010 at 7:13PM
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Are you sure that's not 208/230 volts?

The name plate of the motor will list the acceptable voltages. If 115 isn't included it won't work. Buy a new motor or wire for 240v.

    Bookmark   May 20, 2010 at 11:00PM
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hendricus's link...

is that a real product?!

I built one once... that doesn't mean it was a good idea. What happens when your "120 to 240 adapter" is plugged into circuits A and B, a 240V load is connected, and somebody turns off the breaker for B in order to work on something? The entirety of circuit B remains live through circuit A and the load!

That's a dumb product, and I'm sure that company will eventually be sued into oblivion.

FORGET that idea. Just find a 120V motor or wire properly for 240V.

    Bookmark   May 21, 2010 at 7:37PM
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H'mmm... well, upon reading some of the details of that product, apparently they've prevented the scenario I mention, presumably with a relay or two. I still don't quite trust it, but maybe.

    Bookmark   May 21, 2010 at 7:41PM
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