[RFI] Comments on RFI from Ductless Air Conditioning Units?

[Jim Brown]

On 5/13/2013 7:16 AM, Steve wrote:
> It seems a stretch to me that typical HVAC company would even know 
> what radio frequency interference is, much less know how to deal with 
> it or offer written performance guarantees about it.

That's probably true, but the manufacturers of the equipment should know 
about it, and their products should be free of RFI. Sometimes accessory 
filters are required to do that, and wiring methods can be important. 
When we insist that the HVAC contractor (or other vendor of equipment) 
provide an RFI-free product, we alert that contractor that RFI can be an 
issue, and a good contractor will ask his supplier the right questions. 
If accessory filters are needed, or if specific wiring techniques are 
required, he can build those things into his price for the work.

In most fields of work, there are good guys who try to do things right 
and are willing to learn new stuff, and there are those who don't. When 
we raise our concerns in advance, we weed out the losers and identify 
the winners.

73, Jim K9YC