Topband: Furnace RFI

[Artek Manuals]

Mark, Bill et all
If you Google "Furnace Fan RFI" you will find a host of information on 
how to cure rfi from variable speed AC ( & HEATING) blower fans. Turns 
out that the fans in fact meet the FCC specs but at the level we operate 
at they can wipe out the 500hz segments every 18-25khz. The 
manufacturer  of the fans which are used by 75% of Central A/C guys 
actually has a RFI kit that can be purchased and installed ONLY BY A 
LICENSED A/C Contractor. If it were me I would dicker with whoever you 
buy your unit from that it must have this fan RFI kit installed in 
advance or they don't get the business. The details are in several of 
the google articles.


Dave
NR1DX

On 10/3/2019 6:46 PM, Bill Stewart wrote:
> Mark, we have a York gas pack (a/c and propane heat)(abt 4 yrs old).
> When in the a/c mode and the outside exhaust fan comes on, I hear a spurious signal
> every 25kc or so from lf thru six meters. There may be a way to fix it...
> some kind of filtering maybe, but I don't want to mess with it. GL on
> finding something quiet....73 de Bill K4JYS
> PS...one helpful thing is to keep the t-stat up high so it won't run as much.
> Saves on the electric bill too.....hi.
>
> ----- Original Message -----
> From: "lmlangenfeld" <lmlangenfeld at tds.net>
> To: "topband" <topband at contesting.com>
> Sent: Thursday, October 3, 2019 5:22:31 PM
> Subject: Topband: Furnace RFI
>
> We are in the market for a new high-efficiency furnace, and I note that many (if not most) of the current models use variable-speed DC blower motors.  I am concerned about the potential for RFI from the speed controllers, and wonder if any list members have any recommendations or recent experience (good or bad) with such units.Tnx es 73,Mark -- WA9ETWSent from my U.S. Cellular® Smartphone
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-- 
Dave
Manuals at ArtekManuals.com
www.ArtekManuals.com


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