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  1. #1
    Join Date
    Oct 2002
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    Lexington, NC
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    5,193

    06D oil question

    I have a liebert unit with 2 O6D compressors. Both units are charged to manu specs, and use the same condensor and evap coil. On the top compressor, when I look in the oil glass, I see the oil being kind of sprayed on the glass. When I look at the bottom compressor glass, I don't see the oil being splattered on the window. What I do see is some small bubbles swirling in the oil, and eventually the oil foams on top.

    Both of these compressors are original, and manued on the same day according to the stickers. I am just curious why there is a difference in how the oil appears in the window. thanks
    The main thing is to keep the main thing the main thing!

    If "the grass is greener on the other side", it likely has been fertilized with Bull$hit!

  2. #2
    Join Date
    Mar 2010
    Location
    Morgan Hill Ca.
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    1,228
    Quote Originally Posted by nchvac View Post
    I have a liebert unit with 2 O6D compressors. Both units are charged to manu specs, and use the same condensor and evap coil. On the top compressor, when I look in the oil glass, I see the oil being kind of sprayed on the glass. When I look at the bottom compressor glass, I don't see the oil being splattered on the window. What I do see is some small bubbles swirling in the oil, and eventually the oil foams on top.

    Both of these compressors are original, and manued on the same day according to the stickers. I am just curious why there is a difference in how the oil appears in the window. thanks

    It is called oil windage, the turbulence from the crankshaft are whipping the oil around and causing the disturbance.

    Superheat, compressor bearing and ring condition and oil level all have an effect on how much the oil gets disturbed...

    The proper oil level is 1/3 up the glass from the bottom to no more than half the glass...Higher levels can really get whipped, lower levels causes the oil to run hotter and somewhat "spray" around inside the crankcase...

    Extremely low superheat will cause a bizarre foaming of the oil too, it will also make the level look too high.

    GT
    If a day goes by and you have learned nothing, I hope you got a lot of sleep.

  3. #3
    Join Date
    Jun 2008
    Posts
    73
    not that 3/8 is incorrect but

    The oil level for 06CC size 16 to 37 Cfm compressors and all 06D compressors should be at 1/4 to 3/4 of the sight glass. The oil level for 06CC size 50 to 99 Cfm compressors and all 06E compressors should be at 1/8 to 3/8 of the sight glass.

  4. #4
    Join Date
    Dec 2006
    Location
    Middle Tennessee
    Posts
    11,347

    *

    the evap coil and condeser coils has seperate feeds for each circuit/stage

    when everything is operating properly, the levels should be at 3/8 sight glass as stated

    did the system have refigerant leaks



    .

  5. #5
    Join Date
    Oct 2002
    Location
    Lexington, NC
    Posts
    5,193
    The system did have a leak last year. I am thinking real quick off the top of my head and I can't remember for sure which circuit it was, but the leak was on the condensor in one of the U bends.
    I have toped off both circuits before to manu's specs.
    The main thing is to keep the main thing the main thing!

    If "the grass is greener on the other side", it likely has been fertilized with Bull$hit!

  6. #6
    Join Date
    Apr 2006
    Location
    mechanical room
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    1,309
    too much oil in the sump can cause foaming, due to the crankshaft hitting it

  7. #7
    Join Date
    Dec 2006
    Location
    Middle Tennessee
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    *

    Quote Originally Posted by coolerinfrederick View Post
    too much oil in the sump can cause foaming, due to the crankshaft hitting it
    slugging liquid also causes a foamy sight glass


    but it is important to never bring oil level past a half sight glass especially on Carrier semi's



    .

  8. #8
    Join Date
    Jun 2008
    Posts
    73
    "slugging liquid also causes a foamy sight glass"

    really? I thought it causes broken reeds, rods etc. Your getting slugging, washout, and floodback all mixed up.

    "but it is important to never bring oil level past a half sight glass especially on Carrier semi's"

    first off it's a Carlyle not a Carrier. 2nd, as I've already stated it's 3/8 for a O6E. 3/4 for a O6D.

    Check your superheat. That is refrigerant boiling out of the oil. You may have some minor floodback

    Not that it matters, but I'd be curious to see what happens to the splashing if the rotation of the compressor was reversed.

    edit: actually The bubbling compressor probably wasn't running as long, probably just some off-cycle migration. Wouldn't hurt to check your crank case heater and any pump down, pump out, etc. Is the condenser above the compressor?
    Last edited by rick james; 05-11-2010 at 10:46 PM.

  9. #9
    Join Date
    Feb 2005
    Location
    In a van by the river
    Posts
    621
    chapelle: "I'm Rick James b'tch!" lol
    ## + years in the field never made you a know-it-all This industry is far more diverse than you are

  10. #10
    Join Date
    Mar 2010
    Location
    Morgan Hill Ca.
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    1,228
    Quote Originally Posted by rick james View Post
    "slugging liquid also causes a foamy sight glass"

    really? I thought it causes broken reeds, rods etc. Your getting slugging, washout, and floodback all mixed up.

    "but it is important to never bring oil level past a half sight glass especially on Carrier semi's"

    first off it's a Carlyle not a Carrier. 2nd, as I've already stated it's 3/8 for a O6E. 3/4 for a O6D.

    Check your superheat. That is refrigerant boiling out of the oil. You may have some minor floodback

    Not that it matters, but I'd be curious to see what happens to the splashing if the rotation of the compressor was reversed.

    edit: actually The bubbling compressor probably wasn't running as long, probably just some off-cycle migration. Wouldn't hurt to check your crank case heater and any pump down, pump out, etc. Is the condenser above the compressor?

    I thought I was harsh...


    #1 on the list today, you are 100% wrong on the 3/4 sight glass deal...The reason for the lower oil level for the E series compressors was a design flaw, they had an issue with carry over and the change was made...

    While the maximum oil level on an O6d is 3/4 of a glass, that is with the compressor off, not while running...while running, 1/2 glass tops....

    The proper oil level for an O6D in an air conditioning application is 1/3 to 1/2 glass......


    As for the comment of the bubbling of the oil, you left out "if the sight glass is full of bubbles", a little bubbling is considered "normal" a long as the oil is not sloshing....

    Lastly, who do you think makes the Carlyle compressors? Carrier and Carlyle are like Lincoln and Ford......


    GT
    Last edited by GT Jets; 05-12-2010 at 12:32 AM. Reason: edited reason for change
    If a day goes by and you have learned nothing, I hope you got a lot of sleep.

  11. #11
    Join Date
    Jun 2008
    Posts
    73
    [QUOTE=GT Jets;6652352]#1 on the list today, you are 100% wrong on the 3/4 sight glass deal...The reason for the lower oil level for the E series compressors was a design flaw, they had an issue with carry over and the change was made...

    While the maximum oil level on an O6d is 3/4 of a glass, that is with the compressor off, not while running...while running, 1/2 glass tops....

    The proper oil level for an O6D in an air conditioning application is 1/3 to 1/2 glass......


    page 12 (book, page 14 adobe)
    http://www.carlylecompressor.com/Fil...ver_LOWRES.pdf

    Have a great night


    The whole bottom half of the page has a big picture for you to look at and in big writing says "operating levels".

    so if your running a E at 1/2 your to high, and if your running a D at 3/4 you don't need to install a angle valve and drain. Theres more on the top of page 13. The first time I made this claim I wasn't making it, it was cut and pasted from the manufacturers lit. If you want to argue with them knock yourself out, let me know when you change their minds
    Last edited by rick james; 05-12-2010 at 01:04 AM.

  12. #12
    Join Date
    Jun 2005
    Location
    Portland Oregon
    Posts
    87
    NCHVAC I work on a lot of Lieberts in Oregon, and from the factory the 06D's come over charged with oil. The guys are correct about 1/4 to 3/4, any higher than 1/2 sightglass the oil will get in to the crank spining around and cause it to foam. The easiest way to check for this is ON START of the compressor watch the oil level it WILL pump out and come back as it comes back just keep watching it as it gets over 1/2 sightglass it will start foaming. Now you said that on the top compressor it is spraying oil on the glass and the bottom is not. This could be (if the oil levels are about the same) the top compressor crank is rotating toward the oil sightglass and the bottom is spining away from the glass. This is an easy fix just change the phasing of the top compressor. Hope this helps.
    do things right the first time is cheaper.

  13. #13
    Join Date
    Oct 2002
    Location
    Lexington, NC
    Posts
    5,193
    The oil level is about half. It makes good sense what you are saying about the rotation of the compressors. It looks like they would have phased them the same at the factory.
    The main thing is to keep the main thing the main thing!

    If "the grass is greener on the other side", it likely has been fertilized with Bull$hit!

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