Ceiling fan repair
Goldwing
I have an older sears ceiling fan model 292.906610. I believe it was
once called "Turn of the Century" model deluxe.
It looks to have two speeds and off. The high speed works. The slow
speed looks to have had a variable speed dial (controlled by a
potentiometer) with two leads for it. The pot that was there was a 5k
ohm (probably linear) one. It never worked and we bought the fan second
hand. I don't believe that was the correct one, as it looks to have been
replaced in the past. It was unhooked inside when I took the cover off.
After testing with a multimeter, I went to radio shack and got another
5k ohm pot (this one was audio, they did not have a linear one) to see
what it would do. The one I bought was only rated at .25 watts, which I
think might be much too low. (mounting shaft was 5/16")
Sticker on the motor housing states the following ratings:
120v 60hz 70w .66a ul listed 248a
The fan made a LOT of noise when spinning and the pot was attached and
it was midrange (around 2500-3k ohms) so i wonder if this is even the
right resistance as well.
Testing the two leads for slow speed show I get 70vdc.
Is there anything you recommend I should get to fix it? Where can I get
parts for this model? Seems as if Sears discontinued carrying parts a
number of years ago for this fan. The fan works otherwise, on fast as
well as reverse.
Is that normal for ceiling fans to be dc, and slow speed such a lower
voltage? If so, would it be okay if I shorted these two leads to operate
the fan at slow speed without the variable speed? I would prefer fixing
it correctly, but would appreciate the slower speed until I can get it
fixed.
Thanks,
Loren
James Sweet
directly to control the motor, they work more like a light dimmer, with
a triac and stuff.
zevon8
controller. don't use a light dimmer, they tend to start at zero duty cycle
and go up, this will certainly detonate the triac/scr on its maiden voyage
due to start up current for a stopped motor.
"James Sweet" <james...@hotmail.com> wrote in message
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Goldwing
The pot and the fan pullchain are two separate units, not combined. So i'm
interested in what I can do with the pot or if I can short the two leads.
The suggestions for an off the shelf thing, I haven't seen anything
comparable at home improvement stores such as Menards or Lowes.
Thanks,
Loren
Jerry G.
controlling an electronic circuit that uses a thyristor device to
control the motor speed. A linear pot can be ordered from most any
electronic parts supplier. These pots can come in different sizes,
and the proper choice if fit is the bigger problems here...
The linearity of the pot will change the way the rotation to speed
will feel as you turn the pot. Different log rates are available
for different applications. The RS one would be for audio
applications. As for a speed control, you may find that an audio
taper pot has the biggest response towards the beginning instead of
linearly through the rotation.
Any wattage rating of around 1/4 to a 1/2 watt pot will be good for
a standard thyristor control circuit. If your pot was chosen too
low in resistance, you will lack range. If the pot is too high in
resistance the operation range may be more to one end of the
rotation with little or no response towards the end of travel.
Depending on the particular design the rotation range, and feel if
its response will vary with the pots characteristics...
--
Jerry Greenberg GLG Technologies GLG
==============================================
WebPage http://www.zoom-one.com
Electronics http://www.zoom-one.com/electron.htm
Instruments http://www.zoom-one.com/glgtech.htm
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"Goldwing" <gold...@net66.com> wrote in message
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zevon8
that sells to trades.
Big box retailers likely won't stock something like this, but I'm sure a
comercial supplier will.
They are exactly like a dimmer switch, except they the turn on at full
power, then adjust down to a low speed.
The low speed can be preset usually by a small pot thru a hole in the front
plate.
"Goldwing" <gold...@net66.com> wrote in message
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