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  1. #1
    Join Date
    Dec 2004
    Posts
    54
    I have an American Standard variable speed gas furnace, with a variable speed draft inducer. (AUY060, also the same as a TUY060). Whenever the inducer is running, there is a lot of radio interference generated. The interference exists before the blower fan turns on and stops immediately at the end of the cycle before the blower fan turns off. When the draft inducer fan speed increases, the interference pitch increases too.

    Someone told me that this is a known problem for Trane/American Standard. Last year, my professional HVAC company obtained a new main board from the distributor and replaced it under warranty. However the noise is unchanged and can even be heard on a radio outside of the house.

    Has anyone heard of this problem or know if it is really fixable? The manufacturer won't say anything and directs all calls to the regional distributor, who is the one who said to replace the main board.

    Thanks!


  2. #2
    Join Date
    Sep 2001
    Location
    Vancouver Canada
    Posts
    996
    Get them to replace the inducer and see if it clears up. That seems to be what is causing it.
    "Go big or Go Home"

  3. #3
    Join Date
    Jun 2000
    Location
    WYO
    Posts
    2,019
    Try grounding the motor itself to a water pipe,or other known ground.If that doesnt clear it up the faults in the motor,( loose internal connections,pitted commutator,worn brushes.
    never say never

  4. #4
    Join Date
    Mar 2004
    Location
    Illinois
    Posts
    6,959
    Call the installing company. There is a shielded cable kit available for the inducer. Changing parts other than this...is a waste of time.

  5. #5
    Join Date
    Dec 2002
    Location
    Rochester, MN
    Posts
    5,304
    AM or FM station on the Radio? I don't hear it on mine.

  6. #6
    Join Date
    Apr 2004
    Location
    Bartlett, IL
    Posts
    6,619
    It's either Aliens or you need to call a psychiatrist....


    This gotta be the craziest question I have ever heard of....

  7. #7
    Join Date
    Dec 2004
    Posts
    54

    Post

    Senior Tech, Thanks for the heads up regarding the shielded cable kit. The HVAC company will be coming out soon to do the annual cleaning and hopefully they can clear up the interference once and for all at that time.

    Do you know of any part numbers or part names that they can get from the distributor before they come out? So far they've found nothing. The furnace is covered under the factory extended warranty so perhaps that will help.

    mayguy- It is mostly on AM and a little on broadcast TV as well. It is very noticeable just driving by outside when the furnace (well the inducer fan) is running.

    Thanks!

  8. #8

    Talking

    Sparking, which generates random radio frequency waves, at brushes of a commutator motor is not so rare. You don't need a psychiatrist and it's not aliens.
    Clean commutator and make sure brushes don't stick in their holders.
    If the above does not solve problem install bypass capacitors (ceramic disk)as shown in the following diagram. Note that capacitors must be rated for continuous service at line voltage (UL approved) or must be rated at 1.4kv dc.


    Hope the above helps.

    P.S. Commercial A.C. line filters are also available.

  9. #9
    Join Date
    May 2004
    Location
    Rapid City, SD
    Posts
    7,403
    Originally posted by deme
    Sparking, which generates random radio frequency waves, at brushes of a commutator motor is not so rare.
    Not 100% sure, but I'm betting the variable speed motor (inducer) doesn't have brushes. Not sure exactly what it's called, but things are flipped around from a standard motor.

    P.S. I still think it's aliens too
    "If you call that hard work, a koala’s life would look heroic."

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