Radio Shack sells Feriite-magnetic chokes, for maybe 3$. They are the
round things you often see on your computer cables and power supplies.
They absorb stray RF. They just snap together around a wire. Get a few
and try it, its cheap and worth a try.
Sheilding can be tried but I believe need to be grounded somehow.
I dought a fix may be complete, for this issue file in small claims
now, it will be cooling season before you are heard. Filing will wake
everyone up to give it effort this month.
I'm pleased to report that installation of the shielded cable between
the draft inducer motor and the control board reduced the radio
interference to an acceptable level. Measurements indicate that the
amplitude of the noise is reduced by approximately 20dB. The noise can
now only be heard when my walkman is within 2 feet of the furnace.
Interference on 14MHz is reduced below my ambient noise level from
For all interested, the "shielded cable kit" is part number KIT09682.
It is specifically designed for the following furnace models: UY-W4,
DY-W4, UX-R-W3, and DX-R-W3. Note that the shielded cable has a ground
lead on each end. For effective noise suppression it is essential that
each ground lead be connected to the points specified by the
Excellent----It appears that Trane improved on the shielded cable design--at
least, from your description, it certainly is different than what they gave
me. No ground leads and the shielded part of the cable was free floating,
that is, connected to nothing with about 6 in. of unshielded wiring between
the end of the shield and the connector. Thanks for the feedback, I'm sure
that it will be of help to others.
Thanks so much for following up. I am curious about the furnace models you
wrote above because they only have 4-5 characters. My furnace model number
is AUY060R9V3W5 and other AUY/TUY model numbers are similar. Does the W4 in
UY-W4 refer to the last two characters of the model number? I believe the
last digit is a revision number but am not sure. I have the same exact
symptoms so I am curious if that kit would also apply to me. I've queried
the factory, but no response thus far.
I just had this shielded cable kit installed on my Trane XV90.
Unfortunately, it did not improve the RF interference problem and
actually might have made it worse. On 14 MHz my S-meter jumps from 0-1
to S9 when the inducer blower turns on.
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