Topband: Furnace RFI

[MrToby]

The ARRL has a 2017 presentation on their website titled "Resolving Furnace
and A/C RFI Problems"

On Fri, Oct 4, 2019, 7:26 AM <daraymond at iowatelecom.net> wrote:

> Hello Rob. . .I discussed this very topic with my furnace guy yesterday
> doing annual service on my furnace.  The furnace AC blower motors are
> going
> the way of the abacus.  He said it won't be long before all furnace blower
> motors will be DC.
>
> 73. . .Dave, W0FLS
>
> -----Original Message-----
> From: Rob Atkinson
> Sent: Friday, October 04, 2019 5:43 AM
> To: topband at contesting.com
> Subject: Re: Topband: Furnace RFI
>
> Went through this about 2 years ago.  Firstly, define "efficient."  If
> you mean over 90%, as in one of those two stage furnaces with PVC
> handling moisture then you are consigned to having to use a variable
> speed DC motor (there are no variable speed AC motors, only speed
> settings you set manually at installation) that will cause RFI because
> it is run on variable duration square wave DC.  You will have to have
> the HVAC contractor install a manufacturer supplied hush kit, or do it
> yourself.  The hush kits are over priced and many contractors are
> unfamiliar with them and RFI.
>
> Or, you can do what I did and get a single stage 80% efficient furnace
> that runs on an AC blower and accept 10% less efficiency and get on
> with life.   Mine is around 80K BTU, not extremely big.   There are
> larger ones, or were.  I went with American Standard, an Ingersol Rand
> brand name.   There are around three companies that make all the
> furnaces; IR is one of them.  I've heard the AC blower furnaces are
> going to be history in a few years after which they'll all be high
> eff. DC because gov't is obsessed with this, but that's another topic.
>
> 73
> Rob
> K5UJ
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