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Old 04-30-2012, 11:08 AM   #1
CitadelBlue
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Default I'm Dorothy in Kansas and the Twister is here

Well NOT really but.............................

My daughter has a 5 room plus 2 bathroom townhome on a slab. The heater /AC unit is in the attic and the air supply vents are in the ceiling. There are also 2 return vents in the ceiling - one at the top of the stairs and one at the bottom of the stairs around the corner. When the blower is on I feel like the twister in the Wizard of Oz is just outside the door. Its noisy and its alot of air moving about. We have dimmer control lights, 3 speed ceiling fans and I have a 'variable speed' blower in my home - but you need to be an electronics engineer (or the HVAC guy that has been schooled on the system) to adjust it ......
http://www.gwac.com/variable-speed-blower-motor

So my question is ... is there some kind of speed control that I can wire directly to the blower power wires to 'turn it down a notch" that doesn't require me to donate a kidney or an arm and a leg or replace the motor? Something like this would be great (but I know that this is for a smaller application):

http://www.amazon.com/Electronics-Va.../dp/B000F9B712
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Last edited by CitadelBlue; 04-30-2012 at 01:45 PM.
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Old 04-30-2012, 02:09 PM   #2
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Default Re: I'm Dorothy in Kansas and the Twister is here

Condo, own or rent?
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Old 04-30-2012, 04:46 PM   #3
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Default Re: I'm Dorothy in Kansas and the Twister is here

Townhouse ...own
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Old 04-30-2012, 07:26 PM   #4
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Default Re: I'm Dorothy in Kansas and the Twister is here

See if there are multiple speed taps on the motor.

Are the filters missing on the return vents?

Reducing blower speeds may reduce airflow and cause the AC coil to freeze up.

Find the nameplate on the unit and Google for an installation manual.
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Old 05-01-2012, 01:28 PM   #5
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Default Re: I'm Dorothy in Kansas and the Twister is here

Can you find out what kind of motor it is? Induction, capacitor start, capacitor start-capicator run, or what? I suspect your option will be a (new) multi-speed motor, which I'm sure Grainger (or another supply house) would have.
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Old 05-01-2012, 01:42 PM   #6
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Default Re: I'm Dorothy in Kansas and the Twister is here

you could freeze up your coil if you lower the fan speed...

Your coil is designed to have so many cfm's of air accross it, and if you lower the speed you will affect the air flow.
It would act like a real dirty filter.
I'm not saying it "will happen" it's just an fyi to as what I have always heard.. I don't do a/c for a living, but I know coils will freeze with little airflow.
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Old 05-01-2012, 03:34 PM   #7
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Default Re: I'm Dorothy in Kansas and the Twister is here

I'm afraid to say that there's not a lot of inexpensive things you can do to quiet those systems down. You could have a professional air balancer come in to assess the situation. He could offer several options to your daughter. Sometimes, the best thing to do is to increase the size of the trunk duct as well as the branch ducts, which will increase the VOLUME of air, and decrease the VELOCITY of the air going thru the duct, thereby reducing the noise.

Just a thought......
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