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Old 12-11-2010, 10:22 AM   #1
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ECM blower motor whine


The blower motor on my new Trane XV95 gas furnace makes a discernible high pitched whining noise when it's getting up to speed or slowing down. It sounds like a jet plane engine winding up or shutting down only not as loud, of course. Is this typical for these ECM motors? Once up to speed the noise goes away. My installer seemed to think it was a normal sound. They checked the motor and its mounting and found nothing abnormal. I guess I can live with it but I don't like it.
Was wondering what others have experienced with these ECM motors. Appreciate any comments. Thanks.

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Old 12-11-2010, 10:32 AM   #2
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ECM blower motor whine


ECM motors are normally very quiet. Is the noise from the motor? Is it transmitting through an AM radio?

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Old 12-11-2010, 10:48 AM   #3
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ECM blower motor whine


As long as they did a temp rise test on BOTH stages and it is within specs it should be okay. Lots of them are running too fast or slow. Trane does not know what your ducts look like or their size so it should be properly setup in the home.
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Old 12-11-2010, 10:55 AM   #4
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ECM blower motor whine


The noise seems to be coming from the motor. Used AM radio at low end of the band and didn't hear anything related to the motor spinning. I'm familiar with that technique and tuned around to make sure. I'm just wondering if that is a characteristic of those type motors. Hoping some others can let me know if they hear anything.
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Old 12-11-2010, 11:00 AM   #5
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ECM blower motor whine


Have never heard one whine and we sold several thousand of them in Lennox units.
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Old 12-11-2010, 11:02 AM   #6
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ECM blower motor whine


They did check the temperature rise in both stages and it is within spec. They did run the blower with the door off to listen to the motor but the sound was the same. Not extremely loud, just a little annoying during ramp up and down.
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Old 12-11-2010, 11:05 AM   #7
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ECM blower motor whine


Sounds normal to me, they do have a sound when ramping and that is normal. They rock a bit on startup also and make some noise. Try run it continuos and see if you like that. LOTS of my customers love that. Usually only blows about 400 cfm on low and the motor has ball bearings and is designed for continuos use.

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