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  1. #1
    Join Date
    Sep 2005
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    florida
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    Hmm

    I had service call last night on a rack that was down.found all four compressor's off on oil sentronics.reset comp's checked everything out I could think of.oil sep float working plenty of oil in res oil pot's were 1\2full checked sentronic sensors they were cleen as were sump screen's.wat is going on hear? checked log's it happend one other time about 3 mon ago.this is a med temp r-22 no hot gas def all def on time.run by a rmcc any thoughts would be great. thanks cracker

  2. #2
    Join Date
    Aug 2002
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    intermittant electrical phase interuption??? for all of them to go down at once ... it would take something that affects all four of them simultaneously.

    I'm just brainstorming here ... never seen this myself.

  3. #3
    Join Date
    Dec 2002
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    Question Off on oil ???

    Is it possible ya may have had a phase to the building drop out for a moment???? I would also check for flood back.

  4. #4
    Join Date
    Nov 2003
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    Or more probable was each went off one at a time over a day or two. What kind of seperator and filtration is on it?

  5. #5
    Join Date
    Jun 2001
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    Michigan
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    This right here is a perfect example of why you need a rack computer running and monitoring every thing. It could help you. It might show they all went down at once, or what time, or if they shut down one by one and why. You could know what temps and pressure conditions at that time it went down.

    It such crap not every rack don't have a good computer on it.

  6. #6
    Join Date
    Jul 2001
    Location
    Gold Coast of Connecticut
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    I have seen alot of loop systems build up a slug of refrigerant, especially Hussman non-adjustable txv's with suction stops.
    Aire Serv of SW Connecticut- Gas heat, dual fuel and central a/c systems installed and serviced

  7. #7
    Join Date
    Dec 2004
    Location
    Sunny So Cal!
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    Is there Heat Recovery on the system- an air handler that is. Have seen pump out lines gradually take down racks- at least on older systems....just need a check valve to leak a bit........

  8. #8
    Join Date
    Sep 2001
    Location
    East Stroudsburg, PA
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    Originally posted by Freezeking2000
    I have seen alot of loop systems build up a slug of refrigerant, especially Hussman non-adjustable txv's with suction stops.
    I hates the BI's.

  9. #9
    Join Date
    Feb 2003
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    Originally posted by jerrycoolsaz
    Or more probable was each went off one at a time over a day or two. What kind of seperator and filtration is on it?
    Sounds like a likely scenario, maybe check the logs on suction pressure to find trend of suction pressure raising over past few days to prove this, too bad the RMCC is so limited in # of logs before overwrite though. If you have spare input points maybe add compressor proof auxilary's or wire in sentronic alarm contacts to a general alarm relay, so you will know when the first comp. shuts down.

    Watts New, Ohm My, I been Electrically Commutated. Are U2.

  10. #10
    Join Date
    Sep 2005
    Location
    florida
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    Thread Starter
    thanks everyone but I really havent had time to go into everything mentioned Im gettins ready for a hurricac in c fl rack is running fine so far. it didnt go down on phase fail. their are 2 other racks in motor room and they didnt fail?all power comes from same panel. yes its a loop system but no signs of flood back.also did i tell ya that its rmcc case control? just reaching for info.mabey I can think stright after the hurrican.wish me luck ot hear I come.

  11. #11
    Join Date
    Oct 2005
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    7
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    Oil failure

    Appears to be similiar to what I have encountered. Possible suction pressure increase causing decrease of net oil pressure.

    Found to be the case on Racks where capacity of compressor are crticial. One pump off on a safety can sometimes cause a snowball effect. Causing others to do the same due to the increase in suction pressure. Trick is finding what one problem is causing this.

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