Results 1 to 12 of 12
  1. #1
    Join Date
    Jul 2007
    Posts
    11

    Sentronic oil pressure cut out

    Any of you fellow techs have a lot of experience with Complands
    Sentronic oil pressure control,i had to push reset button on this
    control 5 times before it would reset,unit ran normal,my dad said
    this control has a high failure rate, is this true?all input greatly
    appreciated.

  2. #2
    Join Date
    Dec 2004
    Posts
    509
    No its not true. The sentronic is a safety device indicating there is a problem in your system. If however you keep pushing that reset button without fixing the problem your compressor will have a high failure rate.

  3. #3
    Join Date
    Feb 2004
    Location
    Medford Oregon
    Posts
    807
    gas & go is 145% correct. it's kind like when an overload trips. the inexperienced guy changes or trouble shoots the overload. if an overload trips it usually means it's good, it did it's job.

    the sentronics only has a high failure rate to those who can't find the cause of the trip. they do, however, change a lot of compressors.

    here's one little hint:
    if you trip on oil failure check 3 pressures
    1. suction pressure
    2. crankcase pressure
    3. output of oil pump pressure

    if you post these pressures along with high and low side pressures, many can help you find the problem of why trips occuring.

    if you get an opportunity, attend Copeland's 3 day COSS seminar

  4. #4
    Join Date
    Apr 2001
    Posts
    669
    Quote Originally Posted by truck View Post
    Any of you fellow techs have a lot of experience with Complands
    Sentronic oil pressure control,i had to push reset button on this
    control 5 times before it would reset,unit ran normal,my dad said
    this control has a high failure rate, is this true?all input greatly
    appreciated.
    "Repeated trips of the oil pressure safety control are a clear indication that something in the system requires immediate remedial action. On a well designed system there should be no trips of the oil pressure safety control, and repeated trips should never be accepted as a normal part of the system operation."
    -Application Engineering Bulletin AE-1275-R8



    Now go tell your daddy to go to:
    https://opi.emersonclimate.com/CPID/...AEB/ae1275.pdf
    and read up.........especially if he's going to be working around Copeland compressors 5 horsepower and bigger.

    Jabs

  5. #5
    Join Date
    Feb 2004
    Location
    Medford Oregon
    Posts
    807
    also get the newer Sentrocins bulletin
    https://opi.emersonclimate.com/CPID/...AEB/ae1314.pdf

  6. #6
    Join Date
    Aug 2005
    Location
    Rutland,Vermont
    Posts
    30
    Another thing to look for on frequent oil trips is a bad contactor and loose electrical connections. If the compressor goes off on overload the oil safety will time out and trip, just something else to look for.

  7. #7
    Join Date
    Apr 2001
    Posts
    669
    Quote Originally Posted by simbamolly View Post
    Another thing to look for on frequent oil trips is a bad contactor and loose electrical connections. If the compressor goes off on overload the oil safety will time out and trip, just something else to look for.

    Oh yeah! That's right.
    After reading your reply listed above, I now realize that I'm going to have to keep a close eye on your future post and replies.



    Jabs

  8. #8
    Join Date
    Jul 2005
    Location
    FLORIDA
    Posts
    1,163
    i think he pushed it five times to reset for one loss if i'm reading him right
    there is a maginet that resets the control and sometimes does not make the reset, just a thought and if is a repeat loss then as guys here have said then get your shovel out and start digging and i knew somebody needed an oil bath this week look like your it......... i dont think they have a hi failures


    1 is there oil in crack case/ sight glass
    2 sump screen in compressor is clean
    3 sensor screen is clean and o-ring is nice and pretty not flat letting presure by and there is probably no service port on the crank case so just do pump pressure minus suction...... as you are green so just start small and then we will hammer you with all the absolute proper procedures to get down and dirty.........
    once you think you've seen it all
    (THINK AGAIN)
    I would rather work for free than be look upon as a thief!!!!!

  9. #9
    Join Date
    Nov 2005
    Posts
    579
    I too have never had one fail

    Had one play games with me until I found it was an ambient temp problem with a head master and a fan cycling switch on the same circuit on a remote rack system for a freezer, also a little low on refrigerant. oil was migrating out of the crankcase.

    Point is there is a problem and it has to be corrected. each time you reset the compressor it has been running low on oil for 120 seconds I think?

  10. #10
    Join Date
    Jul 2007
    Posts
    11
    Well unit with sentonic oil cut out still running normal,
    there was plenty of lighting at the time of trip, wonder
    if high current surge had something to do with it?

  11. #11
    Join Date
    Jul 2005
    Location
    FLORIDA
    Posts
    1,163
    well on the first trip i would cover the basic's and keep and eye on it
    cause there could be something brewing and if it don't happen again for a year then your guess is as good as any shiet like this happens all the time
    once you think you've seen it all
    (THINK AGAIN)
    I would rather work for free than be look upon as a thief!!!!!

  12. #12
    Join Date
    Jan 2006
    Location
    DFW Metroplex
    Posts
    4,910
    I've changed two failed Sentronics over the years - Must make me a bad technician I guess...............

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