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Speed Coil Rewinding  Rate Topic 
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 Posted: Mon Aug 6th, 2018 08:00 pm
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Nathan Britt
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I am restoring an R&M 2410 and when I took the base apart I discovered that the speed coil was blackened and looked badly worn. before I broke the fan down I ran it and I'm pretty sure it worked on all three speeds. Could I just coat the windings in insulating varnish or do I need to rewind it?


Also, a wiring diagram for the switch would be greatly appreciated.

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 Posted: Mon Aug 6th, 2018 09:13 pm
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William Dunlap
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Those are pretty toasty. Hey, you could always get lucky.
Check the ohm readings on the leads. If they look OK, shoot it with some insulating varnish, then check again.
Better ask around for those readings, but I expect they would be higher than 0 and less than 200 or so.

In any case, they'll progress from low to high or vice versa as you check them. If no reading, no bueno, if 0, same same.

Cheers,
Bill

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 Posted: Mon Aug 6th, 2018 09:22 pm
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Levi Mevis
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I've got an R & M 3804X that is similar to your fan, I can get some readings from my fan's speed coil and we can compare readings and see if your fan's coil just needs a shot of insulating varnish or if it needs rewound. 

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 Posted: Mon Aug 6th, 2018 09:46 pm
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Mark Behrend
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If it worked before just revarnish it and give it a go.

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 Posted: Wed Aug 8th, 2018 01:53 pm
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Nathan Britt
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I decided to revarnish the coil, but when I hooked it up there was no difference between the speeds. I whacked on it and it ran normally for a few seconds until it slowed down and overheated. I have already unwound the coil and recorded all the information, but in order to rewind it I have to know the wire guage. Does anyone know the correct guage for the speed coil? Thanks.

Last edited on Wed Aug 8th, 2018 02:02 pm by Nathan Britt

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 Posted: Wed Aug 8th, 2018 10:57 pm
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Lucas Beshara
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Using a set of dial calipers measure the wire diameter. Then google a wire gage chart to correlate the diameter to ga. Then just order some magnet wire from Temco:up:

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