Greg,
I should have read your post before submitting my reply to Bob.
The inducer motor is an issue for many people. I found the link (below)
applicable. The photographs show the same Trane furnace (XV90) that I have and
I think I'll try tossing some split beads on the wires. The furnace itself is
way out of warranty so I'll try the home-fixit first.
Last year I would just turn the furnace off with the service switch. Sometimes
I'd forget to turn it back on and wonder why my house was so cool at 5am. Hi!
Neill
> From: gwfields@comcast.net
> To: k0rc@citlink.net; mwa@w0aa.org; cq-contest@contesting.com
> Date: Thu, 10 Dec 2009 16:12:56 -0600
> Subject: Re: [MWA] New furnace... off topic, but related to contesting
>
> Bob,
>
> I put in a new Trane furnace last year that caused S7 noise. First I had
> help from Ron N0AT finding my noisy power pole then I had an S7 noise that
> kept coming and going before I figured out I had another noise problem. Here
> is what I posted to the MWA last March.
>
> It took me two months to figure out what the intermittent noise source was.
> It finally dawned on me one day when I had the radio on as I worked on some
> paper work. Sure enough, the noise came on but, I realized it coincided with
> my new furnace going into it's heat cycle. I then waited until the next
> heating cycle of the furnace to start and sure enough, the noise started
> again. I quickly threw the power switch on the side of the furnace and guess
> what? The noise went out instantly!
>
> A quick search of the Internet for my new Trane XV95 furnace picked up posts
> on eham documenting the same problem. Apparently the inducer motor, which is
> used to vent gases, is the culprit. I found a very good write up on it by
> N9SZ at:
>
> http://homepages.udayton.edu/~zabarnic/RFI.html
>
> I emailed my sales rep from Total Comfort who got the fix from Trane, which
> is a filter of some kind, a new wire for the inductor motor, and two split
> beads. The fix and installation was provided under warranty so it didn't
> cost me a thing, which made me very happy. However, after the fix was
> installed last Tuesday I noticed no difference. I took the next step and
> ordered type 43 split beads from Surplus Sales of Nebraska as N9SZ had. Like
> N9SZ I took 14 split beads this morning and put them all over the wires in
> the furnace.
>
> I am happy to report the noise is gone now. I don't know if just the split
> beads would have fixed it or if I needed the Trane fix and the split beads.
> The bottom line is my noise is gone and I am hoping next Fall's contests can
> be heard in the clear without straining to hear through some sort of noise
> again. If you get a new high efficiency furnace from Trane make sure you
> insist they put in the RFI fix when it is installed.
>
> 73,
>
> Greg K0OB
> ----- Original Message -----
> From: "Robert Chudek - K0RC" <k0rc@citlink.net>
> To: "Minnesota Wireless Association" <mwa@w0aa.org>;
> <cq-contest@contesting.com>
> Sent: Thursday, December 10, 2009 3:18 PM
> Subject: [MWA] New furnace... off topic, but related to contesting
>
>
> The serviceman just left after installing a new furnace controller. I am
> considering replacing the P.O.S. furnace that has kept the repair department
> in an unforecasted revenue stream the last 5 years.
>
> There has been advancements in technology in the past 17 years. This
> includes a variable speed DC blower motor upgrade from a multi-speed AC
> motor. Does anyone have any experience in the newer technologies in regard
> to my HF gear? Specifically, a variable speed DC motor sounds like it might
> be an RFI generator.
>
> 73 de Bob - KØRC in MN
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>
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