Sorry or the top post:
In response to your comments-The furnace is a gas fired XV90 with a variable
speed blower. The noise/interference problem begins as soon as the inducer
motor starts to rotate, well before the furnace fires and before the main
blower starts. The noise remains until the inducer motor shuts down even
though the main blower is still running. I ran the blower only (set the
system on Auto) with nothing else operating (no call for heat) and there was
no interference problem. This is the second XV90 furnace, the first one was
replaced after being in service for about a year, per Trane, when it
developed an internal condensate water leak problem due to poor welding. No
noise/interference with that furnace and interestingly enough, the first
thing noticed when the current one was being installed was the fact that the
inducer motors, old vs new, were completely different looking configurations
with respect to one another.
Yes I have cable and haven't tried experimenting with the TV location as it
is academic--The interference is still there and now I can use it as a good
indicator with respect to the success of any proposed fix
Most electronic equipment must meet specific FCC requirements with respect
RF generated noise. Does anyone know if something like this falls under the
same guidelines?
MLD

"Bob Pietrangelo" wrote in message
...
It depends on the model of the equipment XV90 has a variable speed
inducer,
XL80,XV80,XL90 all have 2 stage inducers. We need more info. Don't thye
have cable or dish in your neighborhood. What happens if you move the TV,
shouldn't be hard with no cable. Does it do it the entire time the
equipment is running or for a shorter period of time. If it is a 2 stage
system does it hapen on low and high fire.

--
Bob Pietrangelo


www.comfort-solution.biz
On Time or Your Service Call is FREE
Preventive Maintenance Specialist




"Brian O" wrote in message
...

"MLD" wrote in message
news:vU3Yd.65224$W16.61022@trndny07...
Have a new High Efficiency Trane Gas Furnace. Every time it fires up
the
picture on a TV set (rabbit ears antenna) on the floor right above it
goes
haywire. The picture becomes almost unwatchable because of all the
noise
streaks and snow in it. The source of the problem is the Vent Blower
(Inducer motor)--the electrical noise is only present when it runs.
So far, following Trane's service Tech instructions, the HVAC Co techs
have
done the following:
1. Checked to make sure that there is a good ground between the
furnace
and
the earth ground.
2. Replace the wiring harness to the vent blower with a shielded
harness--Trane may call it a shielded harness but the shielding ends
about
6
inches from the motor. So there is 6 inches of unshielded wiring which
to
me
is like not having any shielding at all.
3. Replaced the control board.
Why they haven't suggested replacing the Vent Blower is a mystery to
me.
However, while there has been quite a bit of improvement the TV noise
problem still exists. Now waiting on the results of a discussion
between
HVAC Co.and Trane.
I've been told that I'm not the only one that has experienced this
problem.
Has anyone else seen something like this?
MLD

Isn't there some sort of capacitor (condenser) associated with these
motors?
Being an electronic technician, that would immediately draw my
suspicions.
B