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#1
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Reversing Attic Fan Motor Direction Possible?
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? |
#2
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Reversing Attic Fan Motor Direction Possible?
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. |
#3
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Reversing Attic Fan Motor Direction Possible?
"Joe" 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. However, have you considered flipping the fan blade over? |
#4
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Reversing Attic Fan Motor Direction Possible?
On Mon, 09 Apr 2007 19:55:18 -0600, Rick Blaine
wrote: "Joe" 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. |
#5
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Reversing Attic Fan Motor Direction Possible?
On 9 Apr 2007 18:39:28 -0700, "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? Most motors can NOT be reversed. |
#6
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Reversing Attic Fan Motor Direction Possible?
deke wrote:
Most motors can NOT be reversed. I would qualify that. I think if they are designed to run in reverse, they will have separate windings for each direction, with only one of the windings energized at a time. |
#7
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Reversing Attic Fan Motor Direction Possible?
"Joe" wrote in message oups.com... 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? Could be. Is the wiring inside a box with a plate on it? Some have wiring diagrams inside, some have a plate on the motor. Some have none and cannot be reversed. Check the manufacturer web site also. |
#8
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Reversing Attic Fan Motor Direction Possible?
On Apr 10, 10:04 am, Rick Blaine wrote:
deke wrote: Most motors can NOT be reversed. I would qualify that. I think if they are designed to run in reverse, they will have separate windings for each direction, with only one of the windings energized at a time. Vague memories... if it has no windings in the rotor, as many don't, it just runs on phase lag and hysterisis or some such and is unidirectional. If there are windings in the stator and the rotor, then presumably they can be flipped relative to each other... don't know how relevant each type is to the size of motor that might be in a house fan. |
#9
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Reversing Attic Fan Motor Direction Possible?
In article .com,
z wrote: On Apr 10, 10:04 am, Rick Blaine wrote: deke wrote: Most motors can NOT be reversed. I would qualify that. I think if they are designed to run in reverse, they will have separate windings for each direction, with only one of the windings energized at a time. Vague memories... if it has no windings in the rotor, as many don't, it just runs on phase lag and hysterisis or some such and is unidirectional. If there are windings in the stator and the rotor, then presumably they can be flipped relative to each other... don't know how relevant each type is to the size of motor that might be in a house fan. Reversible induction motors will generally have a data plate with wiring connections diagrammed to show how to reverse direction. If it is a shaded-pole motor or other design that is not electrically reversible, it is sometimes possible to dissassemble the motor, turn the stator 180 degrees, and reassemble to reverse the direction. OTOH, if the attic access and the fan are anything like the one in my house, I'd probably just pony up the $60 or $80 for a whole new fan assembly and be sure it would work for a while, I just don't enjoy working in a crouched position standing on top of a square of plywood layed over the ceiling joists in a space full of blown-in cellulose insulation, dust, and low light. -- There are no stupid questions, but there are lots of stupid answers. Larry Wasserman - Baltimore Maryland - lwasserm(a)sdf. lonestar. org |
#10
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Reversing Attic Fan Motor Direction Possible?
On 9 Apr 2007 18:39:28 -0700, "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? Is there a belt you can cross? tom @ www.Consolidated-Loans.info |
#11
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Reversing Attic Fan Motor Direction Possible?
On 2007-04-10, 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? Is there any way you could instead change the pitch of the blades, so that the air goes in the direction you want with the fan rotating in the current direction? |
#12
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Reversing Attic Fan Motor Direction Possible?
"Just Joshin" wrote in message ... On 9 Apr 2007 18:39:28 -0700, "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? Is there a belt you can cross? tom @ www.Consolidated-Loans.info Sure you aren't using the wrong pitch blade from the old fan with the 'new' motor? |
#13
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Reversing Attic Fan Motor Direction Possible?
On 4/9/2007 8:39 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? If it has a capacitor to start/run then yes it can be reversed. But you have to know what you are doing. Find an electrician/AC friend to do it for you, or take the motor to a rebuilding service. They should do it for a coupla bucks. It only involves moving a spade lug over. -- Ted I wasn't born in Texas but I got back here as soon as I could (Don't forget to take out the trash) If you never try anything new, you'll miss out on many of life's great disappointments. |
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