Whole house fan only works at one speed.

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Old 05-09-16, 04:10 PM
J
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Whole house fan only works at one speed.

1/2 hp motor on belt driven fan. When switched to high it sounds as if it's trying harder but there in no noticeable increase in the fan speed. I had worked in the past.

Time for a new motor or is there a replaceable part like a capacitor that might do the trick?

Thanks in advance.
 
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Old 05-09-16, 04:23 PM
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There may be a run capacitor.

A nice clear well lit picture of the motor label would be helpful. http://www.doityourself.com/forum/el...-pictures.html
 
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Old 05-09-16, 06:26 PM
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Hope this is enough. Name:  Motor.jpg
Views: 410
Size:  49.7 KB
 
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Old 05-09-16, 07:07 PM
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It's a split phase motor but no capacitor.
According to the motor plate it's an oilable bearing motor. Has it been oiled ?
That may help.

Just as an FYI.... the most cost effective replacement motor I could find would be a Dayton 6K394. You could search around for that number at the best price.

1/2 hp 1725 RPM 2-speed 115V Whole House Fan Motor Dayton 6K394
 
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Old 05-09-16, 07:24 PM
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wow..they cost almost as much as a new fan. Might consider just replacing as it is kind of noisey and the baffles don't close well. I noticed it needed oil when i took the pic. I will handle that soon and I have never done it but I assume there is some little port with a cap to inject the oil. Easy enough. Thanks for the help.
 
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Old 05-09-16, 09:20 PM
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The motor that is a direct brand replacement for yours is $440.
 
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Old 05-10-16, 03:33 PM
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I noticed it needed oil when i took the pic. I will handle that soon and I have never done it but I assume there is some little port with a cap to inject the oil.
There is a pretty good chance that oiling the bearings will fix your problem, but I suspect you'll have to remove the motor to oil it. I seriously doubt the bearings have ever been oiled since the fan was installed.
 
 

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