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  1. #1
    Join Date
    Dec 2009
    Location
    Bristol NH
    Posts
    229

    half a frozen coil

    I have a 12.5 ton carrier roof top and the lower half of (circuit 1 ) of the evaporator freezes up. Poor temp drop good airflow pressure seem ok 8deg superheat on a low load. Plugged orifice?

  2. #2
    Join Date
    Dec 2005
    Posts
    1,918
    Quote Originally Posted by boilerman856 View Post
    I have a 12.5 ton carrier roof top and the lower half of (circuit 1 ) of the evaporator freezes up. Poor temp drop good airflow pressure seem ok 8deg superheat on a low load. Plugged orifice?
    It needs a technician. No DYI

    Good luck

  3. #3
    Join Date
    Dec 2002
    Location
    SouthEast NC ICW & Piedmont Foothills
    Posts
    7,635
    and the rest of the story is?



    give us something to work with
    It`s better to be silent and thought the fool; than speak and remove all doubt.

  4. #4
    Join Date
    Jan 2010
    Posts
    6,291
    Quote Originally Posted by boilerman856 View Post
    I have a 12.5 ton carrier roof top and the lower half of (circuit 1 ) of the evaporator freezes up. Poor temp drop good airflow pressure seem ok 8deg superheat on a low load. Plugged orifice?
    boilerman856 looks like you have been a member for some time. Are you in the trade ?

  5. #5
    Join Date
    Dec 2009
    Location
    Bristol NH
    Posts
    229
    I am home now so by memory; 67f outdoor ambient, 34%rh, 77f eat cant remember wet bulb. 10 temp split. 150psi high side, 50psi suction.
    And it is only half of one circuit, stage 1.

  6. #6
    Join Date
    Dec 2009
    Location
    Bristol NH
    Posts
    229
    VTP99, yes i am in the trade but new to forums. Also I have very little experince with large commercial units like this.

  7. #7
    Join Date
    Jan 2010
    Posts
    6,291
    Quote Originally Posted by boilerman856 View Post
    VTP99, yes i am in the trade but new to forums. Also I have very little experince with large commercial units like this.
    You should apply for pro. In the pro forums you will get all the help you need. Is the head pressure the same on both circuits ? Sorry i can not help you more because of the site rules.

  8. #8
    Join Date
    Dec 2009
    Location
    Bristol NH
    Posts
    229
    Yes the pressure in both circuits/stages is very close. I dropped the charge and wieghed in virgin 22. This unit is fairly old and looks like everyone has had a turn. How do I apply for pro? what is the difference?

  9. #9
    Join Date
    Jan 2010
    Posts
    6,291
    Get your post count to 15 and then apply. Trust me once your in you will come here all the time for good info.

  10. #10
    Join Date
    Dec 2009
    Location
    Bristol NH
    Posts
    229
    Thats what I thought about forums, but so far not much luck

  11. #11
    Join Date
    Dec 2002
    Location
    SouthEast NC ICW & Piedmont Foothills
    Posts
    7,635
    might want to take a peek at the drier
    It`s better to be silent and thought the fool; than speak and remove all doubt.

  12. #12
    Join Date
    Dec 2009
    Location
    Bristol NH
    Posts
    229
    Looks like the compressor and drier was replaced two years ago(aprox). should have swapped it when I recharged it, just ran out of time and thought I could get away with it...

  13. #13
    Join Date
    Jan 2010
    Posts
    6,291
    Quote Originally Posted by boilerman856 View Post
    Thats what I thought about forums, but so far not much luck
    There are forums that you can't see as a regular member. Keep posting and apply asap.

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