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  1. #1
    Join Date
    Dec 2010
    Location
    Woodbridge Twp, NJ
    Posts
    1,307

    Trying to find a permanent solution..

    I have this rooftop that is vibrating so bad, it's causing the fan blade of an adjacent condenser to come into contact with something and shatter. Ive put rubber feet under the unit to try to isolate the unit but it keeps happening. Any thoughts?
    Every customer you take for granted today will be someone else's tomorrow.

  2. #2
    Join Date
    Dec 2010
    Location
    Woodbridge Twp, NJ
    Posts
    1,307
    Every customer you take for granted today will be someone else's tomorrow.

  3. #3
    Join Date
    Feb 2008
    Location
    California
    Posts
    2,064
    The compressor in the unit causing the vibrations might be FUBAR.

    Even though it's making set point, the compressor could still have a busted connecting rod causing the excessive vibrations.

    Seen it before on Racks with excessive vibration busting discharge lines.

  4. #4
    Join Date
    Dec 2010
    Location
    Woodbridge Twp, NJ
    Posts
    1,307
    It's a Trane rooftop A/C and the main vibration is from the blower and condenser fan motors. It vibrates like craxy when the fan is just on and when the cooling kicks in, it's nuts.

    I'm quoting the guy out a new rooftop unit so hopefully that will help.
    Every customer you take for granted today will be someone else's tomorrow.

  5. #5
    Join Date
    Oct 2011
    Location
    Chicagoland Area
    Posts
    4,510
    Is it feasable to just relocate the condensing unit another 10ft from the Trane? Should take less than a day to extend the lineset and electric.
    I'm suprised the evap coil utubes on the a/c hasn't started to leak. That was common in those units
    Officially, Down for the count

    YOU HAVE TO GET OFF YOUR ASS TO GET ON YOUR FEET

    I know enough to know, I don't know enough
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  6. #6
    Join Date
    Dec 2010
    Location
    Woodbridge Twp, NJ
    Posts
    1,307
    Not really. It's a small fast food joint and 10' it will be off the roof.

    Give it time, they'll probably leak too.
    Every customer you take for granted today will be someone else's tomorrow.

  7. #7
    Join Date
    Oct 2011
    Location
    Hull
    Posts
    53
    It vibrate without the compressor running? Maybe a unbalence fan blade or a bearing?

  8. #8
    Join Date
    Oct 2009
    Location
    Raleigh, NC
    Posts
    790
    The vibrations are not normal. You need to find out what is causing the vibrations and fix it. Attempts to dampen the vibrations will most likely be unsuccessful, especially in the long run.

  9. #9
    Join Date
    Apr 2012
    Location
    Jackson, MS
    Posts
    31
    If most of it is from the blower then u could just replace the blower motor and wheel if its belt driven then replace the bearings

  10. #10
    Join Date
    Dec 2010
    Location
    Woodbridge Twp, NJ
    Posts
    1,307
    I never said i didnt know the cause of the vibration. It's the blower wheel and the condenser fan motors. Ive already talked to the owner a month ago and he's not interested in putting good money in a bad unit. My question is does anybody have any ideas about keeping th vibration down (if not from the RTU, then something else) and have this thing stop shattering blades.
    Every customer you take for granted today will be someone else's tomorrow.

  11. #11
    Join Date
    Mar 2004
    Location
    SE Michigan
    Posts
    17,833
    Perhaps mounting (better) rubber isolation bushings/grommets to where the condenser fan brackets attach and blower motor bracket. Maybe remove the blower housing and lay down some foam tape...double it up even, then fasten down the housing.

    Might just be a bandaid though.
    "Politicians are the lowest form of life on Earth. Liberal Democrats are the lowest form of politician"

    - General George S. Patton

  12. #12
    Join Date
    Feb 2010
    Location
    NE Alabama
    Posts
    301
    Tell him you have already performed your quota of miracles for the month and if he wants this unit to work he's gonna haqve to cough up some actual money.

  13. #13
    Join Date
    Apr 2012
    Location
    Jackson, MS
    Posts
    31
    It sounds like he's already putting good money in a bad unit replace the motors and blower wheel I'm not to big on rigging junk it sounds like he's happy in his poopy diapers

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