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Old 11-10-2014, 10:31 PM
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Variable speed fan?

I have a question for all of you electrical guru's on here. I have a blower fan on my home wood stove. The one on there now (well was on there) is now locked up/ shorted out/ something, it's bad and I'm going to replace it. It was set up originally as a single speed, plug and play type deal. What I am considering is a variable speed switch of sorts so I could slow it down, when I don't need full blast from the heater. What I am wondering is this, can I use a light dimmer switch to reduce the voltage to it and make it variable speed? Or do I need some other kind of switch? OR should I leave well enough alone and turn it on and off as needed? Sorry if this is a ignorant question, but I know enough about electricity to wire in a switch or outlet, other wise I am voltage illiterate......... It is a 1/20 HP dayton 115 VAC motor if that makes any difference, Thanks in advance for any advice you can offer.

Kelly

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Old 11-10-2014, 10:44 PM
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Or would this work?
Shop Lutron Rotary 1.5-Amp 300-Watt White/Ivory Rotary Fan Control at Lowes.com

Kelly
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Old 11-11-2014, 05:07 AM
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I dont think a dimmer would be heavy enough...but I am no electrical genius either.

Moving this to the Garage forum, more should see it there
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Old 11-11-2014, 05:47 AM
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fireplace fan

GFK-160B Time Controlled Fireplace Blower 180 CFM Fan Kit With Hi/MH/ML/Lo/OFF Speed Control
It's been a while since i read the directions on our fireplaces we are installing in our smaller retirement home. My wife does the research on what she wants, I just install. We have a few large wood stove - fireplace stores in this area.
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Old 11-11-2014, 05:55 AM
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No you can't. You could get a multi-speed motor. There is a variable speed motor assembly for furnaces, it is a DC motor with a controller. The one I priced for a customer last year was over $1000!! A few hundred more dollars he could've got a new furnace!! I sold him a 3 speed AC motor instead.
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Old 11-11-2014, 06:27 AM
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The problem is light dimmers are not designed to carry that much current. You can however probably find a motor speed controller for short money on Ebay or similar

Something Like this
Router Variable Speed Controller Electric Motor AC Control Rheostat for Tools | eBay
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Old 11-11-2014, 08:10 AM
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You can't use a dimmer switch for a motor. You need a motor rated switch, and it needs to be sized for the motor. There are numerous variable switches available to use on things like attic exhaust fans, etc. that will work and not fail quickly.
Fan switches (unlike dimmers) start on high, and then get slower as the switch progresses. The start on high is a big help in switch life, and motor life, and you'll need that feature. Here's a bunch on Amazon in both rotary, and slide styles.
http://www.amazon.com/s/?ie=UTF8&key...l_1b1kt0nxy2_p
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Old 11-11-2014, 03:07 PM
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Quote:
Originally Posted by 1971BB427 View Post
You can't use a dimmer switch for a motor. You need a motor rated switch, and it needs to be sized for the motor. There are numerous variable switches available to use on things like attic exhaust fans, etc. that will work and not fail quickly.
Fan switches (unlike dimmers) start on high, and then get slower as the switch progresses. The start on high is a big help in switch life, and motor life, and you'll need that feature. Here's a bunch on Amazon in both rotary, and slide styles.
Amazon.com: fan control switch: Tools & Home Improvement
Those will not work for a blower motor.
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Old 11-11-2014, 07:26 PM
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Quote:
Originally Posted by johnnyg View Post
Those will not work for a blower motor.
And might you tell me why they wont? I've only been a licensed electrician for 38 years, so I'm happy to learn from you.
As long as the switch is motor rated, for the correct voltage, phasing, and current draw, there shouldn't be an issue. A switch doesn't know what the motor is operating. His 1/20th HP motor should raw about 2.0 amps, which will come to 230 w. A motor rated speed control switch will need to accommodate a in rush current of about 3 times that amount, so if it's rated in watts, I'd go 600w., and if in amps, then large enough to handle the 2 a. load.

Last edited by 1971BB427; 11-11-2014 at 07:52 PM.
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Old 11-11-2014, 08:10 PM
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Thanks for all the help from everyone. The new motor should be here Monday, and I think I have found everything else locally to make it work out. Thanks again

Kelly
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