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[RFI] Trane furnace RFI solution

To: rfi@contesting.com
Subject: [RFI] Trane furnace RFI solution
From: "j. viele" <w8jv@yahoo.com>
Date: Sat, 7 Mar 2009 19:29:13 -0800 (PST)
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
I recently traced RFI that was constant and band wide, expecially on the lower 
bands, to my newly installed Trane XV95 furnace.  The S-9 interference appeared 
to be present whenever the "inducer" variable speed DC motor was running.  I 
was instructed by the furnace installer to allow motors to run continuously to 
improve air circulation since an electrtonic air filter option was also 
installed.  The RFI was so severe that I was forced to turn off the furnace 
whenever I wanted to chase DX on 160 or 80 meters.  I contacted Trane customer 
service via e-mail and was informed the next day they provided a kit described 
as KIT14688 that could be installed by a furnace tech from the dealer who did 
the initial installation.  I contacted the dealer, in my case Clayton Heating 
in Youngstown, Ohio, and within a week they called saying the kit was in hand 
and they made an appointment for a tech to install it.  The installation took 
less two hours and was covered by
 the warranty since this was a new furnace.  The unit appeared to be a filter 
in a metal enclosure and several shielded cables.  The tech said this was their 
third installation.  I am pleased to report that the RFI on all bands has been 
cut to nearly zero.  There are, mysteriously, a few frequencies on 17 meters 
where th RFI still is evident but nowhere else.  Since I spend most of my 
operating time on 160 and 80 CW this has not been a problem.  I do have some 
snap-on ferrites that I may install on the motor leads and will let you know if 
it helps keep down the slight RFI on 17 meters.  W8JV
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