I am a HAM for half a century. My furnace has ECM blower motor(a DC
motor) I took care of RFI concern my self with a kit. Brand of the unit
is Carrier. Motor itself seldom fails, the control module does. I have
10 yr. P&L coverage but I can fix the module most likely if it fails.
Another DC motor is not VS but it has speed taps like older PSC motors.
It's my understanding that the manufacturers often have an
interference-suppression kit that they will send free of charge, but the
consumer will still have to pay somebody to install that kit if s/he is
not willing or able to do it him/herself.
On Sat, 22 Jun 2013 18:38:11 -0700 (PDT), email@example.com
The only thing I've ever heard anyone needing an HVAC license for is
buying freon. I've never had problems in the past buying parts for
DIY repairs on AC systems. I don't plan on doing anything
particularly "heavy duty" in the way of repairs.
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