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  1. #1
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    Jan 2011
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    tt, west indies
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    Cvhve oil log ref??"??

    Opened up system to change oil and clean inside oil drum after oil analysis (found dirt),replaced rear bearings , cuz of hi brg temp, started system purged , added some refrigerant(123) got system down to 50degf but it refuses to go lower .
    Customer said they were losing oil before and added abt 27 gallons of oil because the oil level kept droping which was probably due to ejectors, so here r the temps n approaches.lwt51
    Retchw-59
    Ent con-94degf
    Levcon-104
    Evap-18hg
    Con press-14psi
    Condensin temp 116
    Condensin temp in 107

  2. #2
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    Mixing oil and fire with a big spoon.
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    Quote Originally Posted by mr hottstepper View Post
    ...Customer said they were losing oil before and added abt 27 gallons of oil ...
    and the machine runs at all? get a chair, you are going to be there awhile. you will need to remove the refrigerant, distill, repair the oil eductors, evacuate and recharge with distilled refrigerant. good luck.
    "If you pull one more stunt like you just pulled with Tommy, you won't have to get on a plane because I will personally kick your ass from here to Korea!" - Best of the Best

  3. #3
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    Quote Originally Posted by jayguy View Post
    and the machine runs at all? get a chair, you are going to be there awhile. you will need to remove the refrigerant, distill, repair the oil eductors, evacuate and recharge with distilled refrigerant. good luck.
    Was kinda hoping I didn't hav to bring out the drier cores, taut It could hav been something else

  4. #4
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    Quote Originally Posted by jayguy View Post
    and the machine runs at all? get a chair, you are going to be there awhile. you will need to remove the refrigerant, distill, repair the oil eductors, evacuate and recharge with distilled refrigerant. good luck.
    Machine is running quiet no surging , jus temps are holding @ 50 , 100% loaded

  5. #5
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    Quote Originally Posted by mr hottstepper View Post
    Machine is running quiet no surging , jus temps are holding @ 50 , 100% loaded
    you may also be low on charge...if anyone pulls the charge and weighs it, 27 gallons of oil will weigh about 222# and takes up the same volume as 325# of R123 at 90F or 341# at 40F...so distillation is more critical than most people think.
    "If you pull one more stunt like you just pulled with Tommy, you won't have to get on a plane because I will personally kick your ass from here to Korea!" - Best of the Best

  6. #6
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    Quote Originally Posted by jayguy View Post
    you may also be low on charge...if anyone pulls the charge and weighs it, 27 gallons of oil will weigh about 222# and takes up the same volume as 325# of R123 at 90F or 341# at 40F...so distillation is more critical than most people think.
    So still either way I'd still hav to pull the charge ,but if it was low on charge and vanes fully open it should have surged ,and condensing press n saturation temp would have been lower? So I think I'm right back to where I feared. To go I can't afford to shut that machine down this building takes abt 5 days to recover

  7. #7
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    Quote Originally Posted by mr hottstepper View Post
    ...but if it was low on charge and vanes fully open it should have surged ,and condensing press n saturation temp would have been lower?...
    not necessarily. oil inhibits heat transfer which helps keep your condensing temperature and pressure high. i have yet to see a properly running machine with the vanes at 100% and fully loaded...it is possible i suppose, but i would be very suspect if the vanes needed to be that far open at full load.
    "If you pull one more stunt like you just pulled with Tommy, you won't have to get on a plane because I will personally kick your ass from here to Korea!" - Best of the Best

  8. #8
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    Aug 2009
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    Prattville, Alabama
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    I know you're worried about getting chill water temps into the 40's, but don't let that cause you to ignore everthing else. The 2 most obvious problems you appear to have are oil saturated refrigerant and high entering condenser water temps. If you must keep chiller on line, deltap10's advice is good. However it is slow. But at least you can maintain 51 degrees that way. You should quickly work to resolve the problem with the high entering condenser water temperature. That will give immediate results and improvement. That is, assuming you can quickly lower that temp to 85 F or less. Also, the condenser pressure is high for the saturated condensing temperature. Verify proper purge operation. There may be air in the chiller.

  9. #9
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    There is so much oil, it probably has some oil floating on top (as Healy Nut said) of the refrigerant/oil mixture in the evaporator. The refrigerant is saturated to the point that it will not "absorb" any more. Conditions won't improve until the "excess" oil floating on top is removed (actually, absorbed into the refrigerant) and then further oil that is removed will decrease the amount of oil that is dissolved in the refrigerant. That oil floating on top can lower the evaporator pressure further. The layer of oil is a restriction.
    Last edited by Nuclrchiller; 07-30-2012 at 06:17 PM. Reason: clarified "refrigerant/oil mixture in the evaporator"

  10. #10
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    Quote Originally Posted by Nuclrchiller View Post
    There is so much oil, it probably has some oil floating on top (as Healy Nut said) of the refrigerant/oil mixture in the evaporator. The refrigerant is saturated to the point that it will not "absorb" any more. Conditions won't improve until the "excess" oil floating on top is removed (actually, absorbed into the refrigerant) and then further oil that is removed will decrease the amount of oil that is dissolved in the refrigerant. That oil floating on top can lower the evaporator pressure further. The layer of oil is a restriction.
    Well I will be removing more oil later tonight that shoud be the last of it

  11. #11
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    It is also likely that once you remove all the oil, the machine will be short of refrigerant. That was my experience years ago when I removed over 15 gallons of oil from a machine that had the eductor pickup pipe in the wrong place.

    I brought the condition of the charge up to the guy I was assuming the account from. I told him all the refrigerant I had seen looked as clear as water, not like dirty root beer.

    After I took the account over my investigation found that all kinds of oil had been added to the chiller, but none had ever been taken out. When all was said and done I think the chiller was 300# short of R-11.

  12. #12
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    Removed the oil, also found a leak on oil sump gasket , repaird and purged system is working properly now

  13. #13
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    Aug 2009
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    Prattville, Alabama
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    Thanks for the update.

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