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Thread: McQuay AGS 250

  1. #1
    Join Date
    Jan 2008
    Location
    pennsylvania
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    120

    McQuay AGS 250

    Model # AGS250B27-ER10
    On start up circuit 2 runs about 40 seconds and alarms on low oil level. oil level in bottom glass of separator is full and at bottom of top glass during short run time. oil return solenoid is energized(120). EXV readings are good.
    I'm thinking the problem may be the level sensor in the separator but don't know how to prove it. This is a new account with no service lits or IOMs. Any help would be appreciated.

    Thanks

  2. #2
    Join Date
    Jun 2012
    Location
    West Virginia
    Posts
    22
    I have a ags300b27-er10 that I am cutting my teeth on right now so I can't tell you a whole lot about it. try to look up the om agsbb4 and imm ags-1 manuals. I just looked in my operation manual om agsb4 and found that the default low oil level delay is 120 sec. I wonder if the delay is from call for start up. anyways what kind of sensor is on the oil level?..

  3. #3
    Join Date
    Jan 2008
    Location
    pennsylvania
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    the sensor is a Henry. I am assuming it is a level sensor.

  4. #4
    Join Date
    Dec 2011
    Posts
    107
    could be oil filter?

  5. #5
    Join Date
    Feb 2003
    Location
    Wichita Ks
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    1,402
    oil filter will be oil differential, the oil level is a optical sensor on the bottom side of oil separator. also make sure the oil heater is working.

  6. #6
    Join Date
    Jun 2012
    Location
    West Virginia
    Posts
    22
    Steveoo I think you ment to post in this thread friendYes there is a oil dp.check oil return line,strainer pressure drop .Some time if discharge s/h is to low it will cause foaming in oil and optic sensor will see low oil .adjust ball valve in front of oil return valve to keep dis s/h up and out of low dis s/h

  7. #7
    Join Date
    Jan 2008
    Location
    pennsylvania
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    oil heater is ok. I have some other things that need quoted for this job and wont get back till the approval. I will update then.

  8. #8
    Join Date
    Jan 2008
    Location
    pennsylvania
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    Update-was able to return-started pulling charge with the intent to change oil sensor-found circuit 270# low on charge. pressureized and found leak at suction coupling coming off evap. This is a victaulic coupling-ordered and changed gasket-515 on sealing surface and dry on clamp side. Still dont know why the lw oil level alarm showed first.

  9. #9
    Join Date
    Dec 2011
    Posts
    107
    it was 270 pound's low?That's a flooded evap,at 100% refrigerant should be visable in sight glass on evap.what is total charge 350-400?

  10. #10
    Join Date
    Mar 2009
    Location
    Mid-Mo
    Posts
    3,421
    Quote Originally Posted by subcoolguy View Post
    Steveoo I think you ment to post in this thread friendYes there is a oil dp.check oil return line,strainer pressure drop .Some time if discharge s/h is to low it will cause foaming in oil and optic sensor will see low oil .adjust ball valve in front of oil return valve to keep dis s/h up and out of low dis s/h
    That's what I was thinking too about foaming and the oil sensor reacting to that. The older ALS chillers we have are known to do that (I think it's the same sensor, just a lot better setup on the ags).

  11. #11
    Join Date
    Feb 2003
    Location
    Wichita Ks
    Posts
    1,402
    make sure you check the oil return solenoid valve, I have found most leaks at that valve.

  12. #12
    Join Date
    Jan 2008
    Location
    pennsylvania
    Posts
    120
    steveoo, total charge is 321#. leaks repaired, evacuated and charged, running good now.

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