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Posted by Craven Morehead on July 5, 2006, 10:54 am
Fan speeds are controlled by switching capacitors of different sizes in
series with the supply line. If using a fan control other than the internal
pull chain control, one should leave the fan mounted one on "high".
>I recently installed three ceiling fans in a warehouse space. Of the
> three units, one of them failed shortly after installation (the
> installer didn't know what he was doing and blew it up), and someone
> else replaced the wall controller with another unit. The replacement
> wall controller had a 4 position slider (Off / Low / Med / Hi* ) like
> the original, but I don't think it's exactly the same internally
> because in the "Off" position, the fan is still moving at a very slow
> rate (2-4 cycles per minute). Plus the slider goes the wrong way, but
> that's just cosmetic.
>
> The fans have a single hot wire going to them (and a neutral coming
> back), so there's no fancy tach/feedback stuff going on here, just
> supply power manipulation.
>
> I'd like to replace the failed controller with the exact same model by
> the same mfg (Rhine Electronic, Model UC9020, apparently Taiwanese) but
> their website is nonfunctional and I can't even figure out who their
> distributor in the US might be. So now I'm looking into at least
> getting a controller that works the same.
>
> I took the failed controller apart and it is built around two large
> capacitors, labeled 8.0 uF and 12.0 uF (actually they're rated "uFJ",
> whatever that means). There are a few resistors, the 4 position slider
> switch and then that's it. I assume that this serves to cut the AC
> waveform or drop the voltage somehow.
>
> If I go buy a replacement fan controller, what should I be looking for?
> Are there different types? (e.g. voltage limiting? current limiting?)
> All the failed controller label says is the current rating (1.5A).
> Obviously it is possible to get the wrong kind, because that's what
> I've got now.
>
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