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Posted by BT on November 11, 2006, 11:48 pm
modelman wrote:
> Got a call from a Trane rep who contacted my local distributor and
> scheduled to install a shielded cable harness between the PWM control
> board and the motor. The work is scheduled for Tuesday. The Trane rep
> claims that they are aware of the problem and that the shielded cable
> eliminates the noise. Figure I'll give it a shot and take it from
> there.
>
> By the way, MLD reported earlier that he had that done with limited
> success. Hope they have improved the fix.
Modelman,
I have an American Standard two stage variable speed furnace and have the
exact same problem. American Standard owns Trane and furnaces by either brand
name are exactly the same, with the exception of the first letter of the model
number and the label on the door. In other words, the Trane XV is the same as
the American Standard Comfort-R.
I'm guessing that your furnace model number begins with TUY.
I tried to have the dealer resolve the problem without success. I had
consulted with the regional distributor who claimed that there was a main
board replacement fix. The dealer replaced the board under warranty. There
was no change. For other reasons, the furnace was replaced. The new furnace,
built a year later, has the exact same problem.
My noise sounds the same as you, starts when the inducer motor starts (before
the blower fan comes on) and shuts off when the inducer fan shuts off (as soon
as the thermostat stops calling for heat.) When the inducer fan increases in
speed, the interference changes in pitch and may get louder.
The interference is enough that I can pick it up outside the house while
listening to a strong nearby Class A radio station.
I recently saw a post on www.hvac-talk.com that mentioned that Trane/American
Standard now has a fix that involves shielding the inducer fan wiring. This
may be the same thing that MLD reported and you mention above. Please report
back what you experience, I plan to call for service too very soon, while I'm
still under warranty.
While American Standard brand and Trane brand are the same, they have
different wholesale distributor networks, so if one fails to help, perhaps
asking the American Standard distributor for your region could at least have a
clue, not sure. One thing that I am sure about is that calling the
manufacturer is frustrating. At best, you just get redirected to call your
local distributor. When I was having problems with my dealer, the
manufacturer rep admitted that anyone who is locally licensed can be an
American Standard HVAC dealer, they really don't care. I believe they might
more tightly control the Trane brand dealers, but who knows.
You can try calling the manufacturer anyway at 888-556-0125. I would do this
just to register your radio interference issue, in addition to complaining to
FCC. Hopefully if enough of us do this, the problem will someday be resolved.
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