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Thread: rack flooding

  1. #1
    Join Date
    Apr 2003
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    New York
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    698

    rack flooding

    Hello everyone. Went on a call and found all compressors off on ofc and refrigerent mixed wiht oil in crankcase(saw it in site glass). so, I kileed power to all the compressors and toggle switchesand starting with compessor 5 front seat suction service valve and slowly open the valve once compressor was running .I did this to all the compressors along with heating up the bodywith a torch and then cutting on toggle switches slowly until rack was up and running,however did not get to find out what happento cause the floodback was rushed out to do another call.This is first time i come across this,if i could have stayed to complete the call how could this floodback have found ,what are some things i could look for. a by the way a paraelle rack system .

  2. #2
    Join Date
    Oct 2007
    Location
    The rainy state
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    172

    rack flooding

    well this is a call that will come back to you. there are multiple causes for flooding,are all the evap fans on all the equipment, was there a power failure before hand, does the cases and/or walk-ins have good air flow ie anything frozen up. Is the rack mid temp or low temp? some more info is needed on this

  3. #3
    Join Date
    Apr 2003
    Location
    New York
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    698
    Quote Originally Posted by chilly123 View Post
    well this is a call that will come back to you. there are multiple causes for flooding,are all the evap fans on all the equipment, was there a power failure before hand, does the cases and/or walk-ins have good air flow ie anything frozen up. Is the rack mid temp or low temp? some more info is needed on this
    meduim temp r-22 was called out didnot get to adress the issues of air flow ect. was called out on another call.wanted to know things to look for thank you for replying have some were to start now if i get the call again.

  4. #4
    Join Date
    Aug 2000
    Location
    USA
    Posts
    4,979
    Bad fans, frozen cases and TXV's flooding back.
    Quote Originally Posted by jaybee View Post
    meduim temp r-22 was called out didnot get to adress the issues of air flow ect. was called out on another call.wanted to know things to look for thank you for replying have some were to start now if i get the call again.
    Your poor planning does not constitute an emergency on my part!!!!

  5. #5
    Join Date
    Oct 2007
    Location
    The rainy state
    Posts
    172

    rack flooding

    Hopefully you can get back soon, the thing about rack systems is , they won't take hits of flooding like that for long. then it's multiple comp changes , which usually ends up happing on the weekend. best of luck

  6. #6
    Join Date
    Aug 2002
    Location
    Orange County CA
    Posts
    1,084
    If the rack has a controller see when the high suction started and you can maybe trace it back to a circuit maybe coming out of defrost.

    It's a start.

  7. #7
    Join Date
    Jun 2001
    Location
    Michigan
    Posts
    12,077
    you had a rack flooded out that bad, and someone rushed you out of there?

    That's pretty foolish.
    People who think they know everything are a great annoyance to those of us who do.

  8. #8
    Join Date
    Jan 2007
    Location
    maine
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    787
    Quote Originally Posted by Dowadudda View Post
    you had a rack flooded out that bad, and someone rushed you out of there?

    That's pretty foolish.
    Thats about what i was thinking.. Even after u got it up and going say u did have to leave you shouldn't be waiting for the call when it breaks again you should have been back there the next day..

  9. #9
    Join Date
    Feb 2003
    Posts
    1,166
    As previously noted, it is a serious condition that should not have been left. One possibility could be a stuck 3/8" check valve in 1 of the cases allowing liquid to bypass the txv full time, seen that a few times. If so you've likely been called back already??
    Watts New, Ohm My, I been Electrically Commutated. Are U2.

  10. #10
    Join Date
    Sep 2005
    Location
    florida
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    5,495
    I agree with all that was said.Also it's not hard to find the system that's
    floodeding back fire that rack up and watch the suction line's .Ive also have
    also seen it where someone will shut off the evap fan's when working the box.
    I love the smell of phosgene first thing in the morning:

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  11. #11
    Join Date
    Jul 2005
    Location
    FLORIDA
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    what type of controler - ECI was famous for getting stuck for a day or so till the rack was an ice ball and just a simple reset would get it flying again, not including putting all systems through a manual defrost and clearing all ice

    is this a single system set up or loop system and the type of controler would help out here and as ststed before i would make a point to let my supervisor know what i have found and return ASAP, it does'nt take to much for a flooded system to knock out a compressor or 2, then all hell will break loose on you butt for not bringing it to someone's attention with some real smarts and get on top of the situation and even if its you to go back and take your licks trying to figure it out.... these situations are the best teachers where your on your own, GET YOUR ASS BACK THERE SOME HOW AND LEARN
    once you think you've seen it all
    (THINK AGAIN)
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  12. #12
    Join Date
    Oct 2007
    Location
    Richmond, VA
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    ECI is famous for refer temp sensors failing. case controllers set up to maintain a specific temp difference from refer inlet to refer outlet. EEV's wide open and cases flooding. I've spent many days just going thru stores, changing sensors. I've seen compressor discharge lines frosting and heads iced up and compressors still running. Can't remember why we didn't trip oil safeties. AAH, Gotta love refrigeration!!!

    Bill

  13. #13
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    Sep 2005
    Location
    florida
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    5,495
    Quote Originally Posted by CommtechinVA View Post
    ECI is famous for refer temp sensors failing. case controllers set up to maintain a specific temp difference from refer inlet to refer outlet. EEV's wide open and cases flooding. I've spent many days just going thru stores, changing sensors. I've seen compressor discharge lines frosting and heads iced up and compressors still running. Can't remember why we didn't trip oil safeties. AAH, Gotta love refrigeration!!!

    Bill
    Amen to that
    I love the smell of phosgene first thing in the morning:

    To apply for professional membership click here


    Educational forums are open.

    If you would like to submit a link or an article or other related info to the EF. click here

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