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Fan motor runs backwards Bobo 07-13-2007
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Posted by Bobo on July 13, 2007, 5:57 pm
What's up with a third horse whole house fan motor that has begun to
occasionally run backwards. This started happening about the same time
the switch went bad. I put in an identical switch and didn't mess with
the motor wiring. It's AC, 120.
Thanks


Posted by Tony Hwang on July 13, 2007, 6:12 pm
Bobo wrote:

> What's up with a third horse whole house fan motor that has begun to
> occasionally run backwards. This started happening about the same time
> the switch went bad. I put in an identical switch and didn't mess with
> the motor wiring. It's AC, 120.
> Thanks
>
Hmm,
Maybe switch is intermittent. There is no guarantee new switch is 100%.

Posted by Telstra on July 13, 2007, 6:12 pm

> What's up with a third horse whole house fan motor that has begun to
> occasionally run backwards. This started happening about the same time
> the switch went bad. I put in an identical switch and didn't mess with
> the motor wiring. It's AC, 120.
> Thanks
>
The Fan motor capacitor has two terminals each terminal connected
to a motor winding and one also connected to the Active. Switching
the Active to the other terminal will reverse the rotation of the motor



Posted by Mike Dobony on July 13, 2007, 7:38 pm

>
>> What's up with a third horse whole house fan motor that has begun to
>> occasionally run backwards. This started happening about the same time
>> the switch went bad. I put in an identical switch and didn't mess with
>> the motor wiring. It's AC, 120.
>> Thanks
>>
> The Fan motor capacitor has two terminals each terminal connected
> to a motor winding and one also connected to the Active. Switching
> the Active to the other terminal will reverse the rotation of the motor
>

But how can this happen occasionally?



Posted by Bobo on July 13, 2007, 8:54 pm
On Fri, 13 Jul 2007 23:38:13 GMT, "Mike Dobony"

>
>>
>>> What's up with a third horse whole house fan motor that has begun to
>>> occasionally run backwards. This started happening about the same time
>>> the switch went bad. I put in an identical switch and didn't mess with
>>> the motor wiring. It's AC, 120.
>>> Thanks
>>>
>> The Fan motor capacitor has two terminals each terminal connected
>> to a motor winding and one also connected to the Active. Switching
>> the Active to the other terminal will reverse the rotation of the motor
>>
>
>But how can this happen occasionally?
>

Googling I've found one reference to a motor running backwards
sometimes as the capacitor failed, I haven't found even one more
mention of this though,


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