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Thread: hissing sound

  1. #1
    Join Date
    Sep 2004
    Posts
    192
    What does a hissing sound indicate at the metering device of a residential air conditioning system?

  2. #2
    Join Date
    Feb 2005
    Location
    Alabama
    Posts
    534
    I could give you some ideas, but they would be wrong according to RoboTeq.
    "If you can't fix it, don't break it."

  3. #3
    Join Date
    Oct 2003
    Posts
    2,866
    freon passing thru the piston. The hissing may continue for a few seconds after the unit turns off while the pressures equilize.

  4. #4
    Join Date
    Jan 2006
    Location
    Dayton, Ohio [USA]
    Posts
    752
    Originally posted by appltech1
    freon passing thru the piston. The hissing may continue for a few seconds after the unit turns off while the pressures equilize.
    ditto, the sound could last for several minutes and is no reason to be alarmed

  5. #5
    Join Date
    Mar 2006
    Location
    canada
    Posts
    15
    means its working

  6. #6
    Join Date
    Jul 2001
    Posts
    3,112
    what if you aren't using freon? Would R-22 make a hissing sound? What about R410A. Is the hissing unique to freon?

  7. #7
    Join Date
    Jul 2005
    Location
    Orange County, NY
    Posts
    936
    Originally posted by troyorr
    what if you aren't using freon? Would R-22 make a hissing sound? What about R410A. Is the hissing unique to freon?
    No, the hissing sound is created by a drop in pressure. Same as if you where to kink a garden hose.

    Core

  8. #8
    Join Date
    Dec 2001
    Location
    Phoenix, Az
    Posts
    1,243
    No problem usually if you have a piston, but could be low charge in a TXV system.

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