Nice thought, but I went a bit down that road--I'm fuzzy about the specific
details but for one reason or another the people that I spoke to didn't give
me anything positive. Something about the generation of RF interference not
applying to a product like a furnace. Since this has been a problem for so
long and Trane has not been mandated to fix it lends some weight to what I
was told. I did tell the Trane Rep that I was going to contact someone in
higher management (VP etc) and issue a complaint at that level----didn't
phase him. Then I put in my cable line and didn't follow up. For those of
you still aggravated by the RF noise why not try this route? I guess that
if you go the way of the Small Claims Court you probably have to sue the
installer as well as Trane and it would have to be for a complete
replacement (one without the problem)or a removal and money refunded.
MLD
"Smarty" wrote in message
...
Good point! There are FCC rules regarding interference / EMI and Trane may
have flagrantly ignored them. Maybe a threatening letter to the Customer
Service Department written with the help of those of us who are amateur
radio / electrical engineering types would force them to finally do the
right thing.


Smarty


"Mark" wrote in message
oups.com...
modelman wrote:
Several months ago I had a high efficiency Trane XV90 natural gas
furnace and heat pump installed. Since the weather has recently been
cold enough for the gas furnace to provide heat, I have been
experiencing severe radio interference. The interference wipes out AM
broadcast reception throughout my house. I also see snow on a TV
connected to an external antenna.

The radio noise occurs as soon as the draft inducer motor starts up;
the pitch of the interference is related to the motor speed. The draft
inducer motor is a dc motor driven by a PWM controller on the main
circuit board. It is well known that PWM systems generate strong
harmonics throughout the radio spectrum, resulting in radio
interference. However, properly designed PWM systems include filtering
and shielding to suppress the radio frequency currents from the wiring.

I contacted my installer, who is totally unfamiliar with the problem.
The electrician who was sent to my house to investigate the problem
also doesn't understand what's going on. I had to explain the
difference between an RF ground and dc or house ground to him.
Although everything appears to be well grounded from a dc perspective,
I suspect that portions of the system are radiating RF energy.

Several days ago I emailed Trane about the problem, but haven't
received any response.

Although there has been past discussion in this group about radio/TV
interference emanating from Trane high efficiency gas furnaces, I
haven't seen any definitive fix. Does anyone know if Trane has a fix
for this problem. Do they have a shielded cable and or rf filter kit
to suppress this noise? Since my system is under warranty, I won't
attempt any modiifcations to the system.

Has anyone experienced this problem?

Thanks.


Trane should be made to fix this and recall all the units that have
been installed. I can pick this interference up on a 2 meter receiver
in my car for blocks. The FCC should bust them if they don't fix it...

I cross posted this to some of the amateur radio groups.

Mark