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  1. #1
    Join Date
    Jan 2011
    Posts
    6

    Question Air-cooled chiller PM

    I am experienced in property management, but not a chiller experts. I recently took over a site with a 16 y.o. 205 ton McQuay air-cooled chiller. I asked a reputable service vendor for a proposal to do tear-down and eddy current testing. My previous experience being w/ water-centrifugal chillers, i thought this was a good idea not knowing chiller history.

    The vendor replied that neither tear-downs or EC's are done on air-cooled chillers. I know the condenser isn't shell/tube, but isn't there value to EC an air exchange? Shouldn't the evaporator still be EC'? And finally, tearing down these outside units isn't done?

    Am i wrong or is my service vendor?

    I welcome comments/feedback. thanks

  2. #2
    Join Date
    Oct 2005
    Location
    Las Vegas
    Posts
    45
    If this is a screw machine, tear-downs are not performed. I've never heard of a screw being EC'd either.

  3. #3
    Join Date
    Dec 2010
    Location
    Central US
    Posts
    415
    Your service contractor is correct. You can EC the evap barrel if there is a suspect rupture or if suspect lack of chemical treatment. Typically on smaller barrels after you have determined tube rupture you plug it, then budget to replace barrel or chiller. It is a good idea to inspect tubes after 5 years of operation for sludge, and tube cleaning if necessary. Other wise it would just be a typical PM on chiller. Mechanical & electrical. Condenser cleaning super critical, Im not talking a 1 hour hose job either, more like an all day water and chemical cleaning or steam clean.

  4. #4
    Join Date
    Mar 2010
    Location
    Va.
    Posts
    180
    All McQuay air cooled chillers I've worked on are direct expansion evaporators (the refrigerant is in the tubes not water). You can't EC a direct expansion evaporator. I copied a page from a McQuay IOM listing the maintenance schedule. You need to listen to your vendor on this one.
    Attached Files Attached Files

  5. #5
    Join Date
    Dec 2005
    Location
    Rockhill South Carolina
    Posts
    370
    There are flooded evap air cooled units AGS and Pathfinder.Your biggest battle is going to be keeping condenser fan motors in it,and compressors I assume this is a recip.

  6. #6
    Join Date
    Sep 2004
    Location
    Kansas City, Kansas, United States
    Posts
    13,832
    you can not eddy current test a dx chiller!

    205 ton air cooled dx chiller?
    does it have a few recips on it?

    what kind and how many compressors does it have?????????

  7. #7
    Join Date
    Dec 2010
    Location
    Central US
    Posts
    415
    Quote Originally Posted by supertek65 View Post
    you can not eddy current test a dx chiller!

    205 ton air cooled dx chiller?
    does it have a few recips on it?

    what kind and how many compressors does it have?????????
    You can't EC the refrigerant tubes after removing the end plate of the evap barrel??????

  8. #8
    Join Date
    Mar 2010
    Location
    Va.
    Posts
    180
    Quote Originally Posted by captinsano View Post
    There are flooded evap air cooled units AGS and Pathfinder.Your biggest battle is going to be keeping condenser fan motors in it,and compressors I assume this is a recip.
    The AGS comes with a DX evap. standard and a flooded evap as a option.

  9. #9
    Join Date
    Dec 2005
    Location
    Rockhill South Carolina
    Posts
    370
    What do i have to go through all the vintages?

  10. #10
    Join Date
    Jan 2011
    Posts
    6
    Appreciate replies. It is a packaged unit that provides CHW to 3 AHU's. I don't have nameplate data in hand, but attached photo. Based on feedback, sounds like a good PM is best choice.


  11. #11
    Join Date
    Jan 2011
    Posts
    6

  12. #12
    Join Date
    Jan 2009
    Location
    Not in Iran
    Posts
    1,091
    ags is screw machine i think..
    no signature blast'em man blast'em
    !!!KILL THE TERRORIST!!!

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