[RFI] Single stage HVAC with ECM

[John Pelham]

In 2012 I had a Trane heat pump system with an ECM in the air handler installed. It was quite noisy on HF. I was able to reduce the noise to negligible levels with #31 ferrites on the motor and thermostat wires.

73, John W1JA

-----Original Message-----
From: RFI [mailto:rfi-bounces+john=radiophile.com at contesting.com] On Behalf Of Wes Stewart via RFI
Sent: Friday, January 8, 2021 12:03 AM
To: rfi at contesting.com; Steve Dyer
Subject: Re: [RFI] Single stage HVAC with ECM

 They are also more expensive and unreliable than PSC motors and probably will never pay for themselves in energy savings.  But they are designed to federal energy standards where cost to the consumer is of no consequence.
I recently had one fail in my heat pump.  After some heroic troubleshooting (if I do say so myself) I found a shorted winding in the motor and was able to pry the windings apart, clean off the carbon track and dab on some insulation.  I figured I saved $1K on a new motor and at least $1K in service charges.
Naturally, I used my $2K savings to purchase a $3K radio, a TS-890S.
Wes  N7WS

    On Thursday, January 7, 2021, 5:03:12 PM MST, Steve Dyer via RFI <rfi at contesting.com> wrote:  
 
 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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