Electronically Commutated Motor. And no, they aren't by design noisy.
Poorly implemented ones can be though!
I have several in my HVAC and they are quiet. The air handler blower
motor and condenser cooling fan are often ECM in modern systems like
what K2KW is looking at.
73,
Steve
W1SRD
On 1/7/2021 15:56, Jim Brown wrote:
On 1/7/2021 1:24 PM, Kenny Silverman wrote:
If the units are single stage, is there less concern about RFI?
If there is a variable-speed-contolled motor, there will be noise. I
don't know what ECM is the acronym for. :)
73, Jim K9YC
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