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Reversing Attic Fan Motor Direction Possible? Joe 04-09-2007
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Posted by Joe on April 9, 2007, 9:39 pm


I am replacing the old attic fan motor with a slightly less used one
from another house. The motor is a a two speed motor, but this house
is only a one speed wiring and switch.
After installing it, using only the high speed terminal, the fan is
going in the wrong direction. I tried reversing the wires in the box
to see if that'd reverse the direction but no joy.
Does this indicate that this motor cannot reverse direction?


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Posted by Tony Hwang on April 9, 2007, 9:55 pm


Joe wrote:

> I am replacing the old attic fan motor with a slightly less used one
> from another house. The motor is a a two speed motor, but this house
> is only a one speed wiring and switch.
> After installing it, using only the high speed terminal, the fan is
> going in the wrong direction. I tried reversing the wires in the box
> to see if that'd reverse the direction but no joy.
> Does this indicate that this motor cannot reverse direction?
>
Hi,
Depends on what kinda motor.

Posted by Rick Blaine on April 9, 2007, 9:55 pm



>Does this indicate that this motor cannot reverse direction?

In the dusty recesses of my mind, I seem to recall that electric motors are
wound to run CW or CCW. My guess would be no, you can't.

However, have you considered flipping the fan blade over?

Posted by mm on April 9, 2007, 10:49 pm


wrote:

>
>>Does this indicate that this motor cannot reverse direction?
>
>In the dusty recesses of my mind, I seem to recall that electric motors are
>wound to run CW or CCW. My guess would be no, you can't.

There are reversible fan motors. I used to have a 21" box fan that
had one. Don't know how common they are, or in this size.

But it would have an extra wire. And there is an extra wire, but you
think that is for the other speed. If you're not positive, it
wouldn't take long to connect it instead and find out.

>However, have you considered flipping the fan blade over?

Strangely, that wouldn't change anything, but turning the whole motor
over would. Would it be safe to run that way? You'd probably have to
build a bigger shield and screen.

Posted by deke on April 10, 2007, 8:24 am



>I am replacing the old attic fan motor with a slightly less used one
>from another house. The motor is a a two speed motor, but this house
>is only a one speed wiring and switch.
>After installing it, using only the high speed terminal, the fan is
>going in the wrong direction. I tried reversing the wires in the box
>to see if that'd reverse the direction but no joy.
>Does this indicate that this motor cannot reverse direction?

Most motors can NOT be reversed.



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