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Thread: noisey scroll

  1. #1
    Join Date
    Apr 2011
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    Scotland
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    noisey scroll

    I have just fitted a new maneurop danfoss scroll compressor running R22 which is very noisey, new contactor and over load, and I am now charging in the recovered R22 however on staring up its very noisey even when taking gas discharge is hot and suction side is coming back cold ok the comp top is very hot too hot to touch, lowside will pull right down but high side hovers around 100 psi could I have a partial restriction both valves at mid seat during charge process any ideas guys
    Pict

  2. #2
    Join Date
    Jan 2009
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    Not in Iran
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    992
    need pressures, hi and low, superheat and subcool as well as inside and outside temp, also what is temp split?
    as for the top of the scroll compressor, the top is and asts as a dome, it will be hot,
    no signature blast'em man blast'em
    !!!KILL THE TERRORIST!!!

  3. #3
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    Apr 2011
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    Scotland
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    Hi and thanks HS is 100psi LS is 5 psi SH is 15C, no idea what the SC is as the AHU is 2 storeys up and I was working single handed today and did not feel to happy about leaving it running when it's making such a racket in case the damn thing squeels to a halt, like I said I do not have all the Gas back in because of the noise, and the term temprature split I don't understand sorry and all I can give you is the outside temp @8c inside temp will be 20 c give or take a few Degs c
    Pict
    Last edited by the pict; 04-03-2011 at 08:48 AM. Reason: more info

  4. #4
    Join Date
    Nov 2006
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    Southeastern Pa
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    16,995
    Let us know what you find when you go back.

    What was the failure of the first compressor? Did you do an acid test? Clean the expansion device? Replace the LL dryer?

    You are doing the right thing by trying to find what killed the first compressor.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

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  5. #5
    Join Date
    Apr 2011
    Location
    Scotland
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    Cheers guys the first comp I think judging by the top which was burnt black ran a bearing I was going to cut the top off but it was collected as scrap before I got a chance, the LS valve stuffing gland had also pissed all the oil out but there as 35 kilo of gas recovered so I am puzzled why did'nt it lose the gas ? any way, New Comp, New contactor, new filter drier, triple vac with OFN each time and left with a holding charge of OFN @200 psi for 48 Hours CC heater was never connected! is now at works OK I did an acid and contaminant on the gas and on the oil check it came out clear, one other thing the twin condenser frames were absolutly choked I had to get the local drain guy in to lance the coils I know all this sounds like a complete lack of maintenance and I agree the guy they usually get for all the frigde stuff just did'nt want to know so it has never been looked at in the last 12 years I welcome any input
    Pict

  6. #6
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    Feb 2011
    Location
    Baltimore Md.
    Posts
    13

    noisy compressor

    Did you change phase rotation?

  7. #7
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    Apr 2011
    Location
    Scotland
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    Ice Pro Yes PR was checked and confirmed it was something that occured to me that it can be something that changes down the line it might well be OK at the point of in take but gets crossed before it goes to the compressor terminals I have checked it all the way down but I never checked the actuall terminals at the comp, should I ?, I have always thought it's not recommended any thoughts
    Pict

  8. #8
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    Dec 2010
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    change the phase rotation.

  9. #9
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    Sep 2009
    Location
    Boyertown, Pa
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    50
    I'm not sure how much of the refrigerant charge that you got in to it, but having 5 psi suction is not good with scroll compressors. The minumum for operating is 15 psi or else the scrolls will self destruct with not enough refrigerant being compressed between the scroll plates. If you are still charging, maybe pump the refrigerant in with your recovery machine until you get most of the charge in and then restart the compressor.

  10. #10
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    Sep 2009
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    Boyertown, Pa
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    Also, don't change the phase rotation as suggested. You have 100 psi discharge and 5 psi suction so that means it is pumping. By reversing rotation, you would have similar pressures and noise.

  11. #11
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    TMS134 is correct. It appears your rotation is fine, based on those pressures.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

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  12. #12
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    Apr 2011
    Location
    Scotland
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    Thanks again guys the main puzzle for me is before I started it today the pressures had equalized at around 100psi both gauges, however as I ran it and the pressure began to rise on the HS and drop on the low side it did not seem to take any more gas and the noise was much the same throughout, but when I stopped it, and as I believed began to shut the HS service valve I heard a rush of gas through the HS line and the LS gauge dropped dramatically to almost a partial vac, so is it possibble that this service valve operates in opposite IE anti clock to close seems odd to me, mind you its not a rotolok on the comp case it's in-line after the tandem condensers meet into a single line, could I have got this backwards should it have been mid seat as the LS rotolok I believed this was a simple shut off isolating valve again your thoughts will be welcome
    Pict

  13. #13
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    Nov 2006
    Location
    Southeastern Pa
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    16,995
    I'd say you certainly need to feel comfortable with the valve operation. So, confirm that.
    From what you have said, you may have a restriction. What type of expansion device is in use?
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

    AOP Forum Rules:







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