Results 1 to 12 of 12
  1. #1
    Join Date
    Jun 2009
    Location
    greece
    Posts
    11
    Rep Power
    0

    coldroom too much ice on evaporator



    hi everyone!r404 coldroom has ice build up every 10 days.during winter it was working fine and now there is a big problem.working temperature of coldroom is between 0-2 celsius.thans in advance!



  2. #2
    Join Date
    Apr 2009
    Location
    israel
    Age
    50
    Posts
    778
    Rep Power
    18

    Wink Re: coldroom too much ice on evaporator

    Quote Originally Posted by stathis View Post
    hi everyone!r404 coldroom has ice build up every 10 days.during winter it was working fine and now there is a big problem.working temperature of coldroom is between 0-2 celsius.thans in advance!
    Hi :
    1. u probably dont have a DEFROST SEQUENCE u should add one.(compressor standby)
    2. are your pressures okay??
    3. is your txv set ok?
    4. do u have head pressure control?
    5. does compressor cycle off when door is open?
    6. if this is the first year u have a problem ,and u charged the unit durring the winter,u might be low on refregerant.
    7. good luck
    THE DEFINITION OF A SMART PERSON IS ONE WHOM LEARNS FROM HIS MISTAKES!!!

  3. #3
    Join Date
    Jun 2009
    Location
    greece
    Posts
    11
    Rep Power
    0

    Re: coldroom too much ice on evaporator

    dear friend yes its the first year the system works it has defrost system with heaters and it works everu 8 hours for 10 minutes.working presure for r404? i think i need charging but the sight glass fills completely when its working...thanks in advance!

  4. #4
    Join Date
    Apr 2009
    Location
    israel
    Age
    50
    Posts
    778
    Rep Power
    18

    Re: coldroom too much ice on evaporator

    Quote Originally Posted by stathis View Post
    dear friend yes its the first year the system works it has defrost system with heaters and it works everu 8 hours for 10 minutes.working presure for r404? i think i need charging but the sight glass fills completely when its working...thanks in advance!
    Hi
    yes by giving us the working pressure corilated with the room temp at that moment ,u could determin if you are working correctly ,and i think u should check your txv setting.
    good luck
    THE DEFINITION OF A SMART PERSON IS ONE WHOM LEARNS FROM HIS MISTAKES!!!

  5. #5
    Join Date
    Dec 2008
    Location
    Portugal
    Age
    48
    Posts
    1,044
    Rep Power
    19

    Re: coldroom too much ice on evaporator

    Quote Originally Posted by stathis View Post
    hi everyone!r404 coldroom has ice build up every 10 days.during winter it was working fine and now there is a big problem.working temperature of coldroom is between 0-2 celsius.thans in advance!
    Check the evaporating temperature. Does the defrost is completed? Does the doors remain very time long open? Does the infiltration air is exterior from the exterior of the building? In the summer there is more water vapour content on the air (higher absolut humidity). Maybe you need an air curtain or something like that.

    Regards
    To make progress is never good enough, I want to do better and better and better

  6. #6
    Join Date
    Apr 2010
    Location
    oxfordshire
    Age
    39
    Posts
    15
    Rep Power
    0

    Re: coldroom too much ice on evaporator

    I agree with Sandro, humidity is going to be much lower in the winter.
    Obviously check for any air gaps on doors, etc..
    Also, i've always been told to have 4 defrosts a day, every 6 hours.

  7. #7
    Join Date
    Dec 2009
    Location
    dublin
    Posts
    14
    Rep Power
    0

    Re: coldroom too much ice on evaporator

    hey.did u check the door seals are not cracked,the right size for the door,does the door shut ok

  8. #8
    Join Date
    Nov 2009
    Location
    Minsk, Belarus
    Age
    39
    Posts
    171
    Rep Power
    15

    Re: coldroom too much ice on evaporator

    In addition check fin spacing of evaporator may be small distance beetwin fins.

    Also, i've always been told to have 4 defrosts a day, every 6 hours.
    Or increase defrosting time...
    In some places will have to think ...

  9. #9
    Join Date
    May 2010
    Location
    Dallas
    Age
    39
    Posts
    41
    Rep Power
    0

    Re: coldroom too much ice on evaporator

    I am a facilities manager for OSI Restaurants and most our refrigeration operates off of R-404. I had a walk in freezer do the same thing. Make sure the condensor fans on the roof are operating correctly

  10. #10
    Join Date
    May 2010
    Location
    Dallas
    Age
    39
    Posts
    41
    Rep Power
    0

    Re: coldroom too much ice on evaporator

    sorry misread your thread. Thought you were having ice build up on the evaporator. But ya sounds like an insulating problem to me

  11. #11
    Join Date
    Dec 2008
    Location
    Portugal
    Age
    48
    Posts
    1,044
    Rep Power
    19

    Re: coldroom too much ice on evaporator

    Quote Originally Posted by samisonfire View Post
    I agree with Sandro, humidity is going to be much lower in the winter.
    Obviously check for any air gaps on doors, etc..
    Also, i've always been told to have 4 defrosts a day, every 6 hours.
    Stathis,
    How much time do you have the defrost time for each cycle? Does the defrost is totally completed after the end of the evaporator?

    Also if you have the evaporators next to the acess door (mounted on that wall) that wouldn't help to prevent ice formation on the fin coils of the evaporator.
    To make progress is never good enough, I want to do better and better and better

  12. #12
    Join Date
    Mar 2010
    Location
    pakistan
    Posts
    45
    Rep Power
    0

    Re: coldroom too much ice on evaporator

    1) Shortage of refregerant
    2) Txv not adjusted
    3) Heater not working

Similar Threads

  1. Superheat and Subcooling
    By Chunk in forum Fundamentals
    Replies: 42
    Last Post: 15-01-2011, 02:24 AM
  2. How can I reduce evaporator pressure?
    By mansari in forum Fundamentals
    Replies: 29
    Last Post: 05-09-2009, 01:59 AM
  3. EVAPORATOR leaked
    By James priyono in forum Air Conditioning
    Replies: 4
    Last Post: 23-05-2009, 10:19 AM
  4. 0C Coldroom Evaporator operating at 20C
    By samiam in forum System Optimization
    Replies: 6
    Last Post: 29-09-2008, 11:24 PM
  5. What is the best location for a evaporator fan?
    By Jasno999 in forum Fundamentals
    Replies: 3
    Last Post: 21-02-2007, 01:34 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •