[RFI] RFI and furnaces

[k2dp at charter.net]

Mel,

This is great information. As the amateur community, we need to gather more 
data like this for a variety of household appliances, such as TV's, the new 
fancy clothes washers and dryers, HVAC equipment, etc.

Thank you for pulling this information together.

73,
Dave Propper, K2DP- St. Louis
Assistant Director, ARRL Midwest Division
----- Original Message ----- 
From: "Mel Crichton" <kj9c at iquest.net>
To: <RFI at contesting.com>
Sent: Saturday, November 13, 2010 9:35 AM
Subject: [RFI] RFI and furnaces


> Here's a summary of responses to my query on RFI from high-efficiency gas 
> furnaces, many of which use electronic control modules and variable speed 
> (sometimes DC) motors. I chose a Carrier Infinity, 95% efficient unit with 
> variable combustion blower controls, and so far have heard nothing from 
> it, even on 160 meters.
>
> Clean: Carrier Infinity (2 examples),  Lennox G51MP gas furnace/AC, Amana, 
> Rheem (RFI for a few seconds only when the burner fires off), Burnham, 
> Climate-Master Tranquility 20 ground loop heat pump.
>
> RFI-prone - Lennox G71MMP, Trane XR15, Trane (no model mentioned, 
> manufacturer's fix helped a little)
>
> One guy traced his RFI to the new solid state thermostat that came with 
> the hi-efficiency furnace. I can't speak to that, as I kept my old 
> programmable thermostat.
>
> As stated in so many posts on this reflector, your results may differ - 
> case in point, the clean Lennox vs a similar Lennox with problems. Also, 
> some high-efficiency units mentioned may have been 90% or so, and may not 
> have the fancy speed and burner controls.
>
> Suggest using a portable AM radio at an existing installation, if at all 
> possible. And of course, try to get something in writing from the 
> installer, although appliances are not covered under the RFI standards 
> (such as the plethora of "dirty" plasma TVs)
>
> Thanks to all who replied. I chose Carrier because it's made locally (in 
> Indy), but so is Bryant (a Carrier subsidiary, probably the same RFI 
> performance).
>
> Mel KJ9C
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