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Thread: Frozen Unico

  1. #1
    Senior Tech Guest
    Okay all you experts...frozen unico air handler with amana condensor...

    Pressures
    200 High
    42 Low

    Static Pressure
    1.70" Supply
    .10" Return

    78* Return
    Damn Cold Supply

    85* Ambient

    This is a 2 ton system with 8 supplies and one return, has a txv (new) and clean filter and coil....getting more info via nextel...tech on site...back with more soon...had 0* subcool til he added freon...

    [Edited by senior tech on 06-04-2005 at 11:25 PM]

  2. #2
    Join Date
    Apr 2004
    Location
    Niantic, Illinois
    Posts
    545
    undercharged

  3. #3
    Join Date
    Apr 2004
    Location
    Niantic, Illinois
    Posts
    545
    depending on the linset length it should be at lest 10 degree subcooling on r-22

  4. #4
    Senior Tech Guest
    8* subcool now...still freezing...

  5. #5
    Join Date
    Apr 2004
    Location
    Niantic, Illinois
    Posts
    545
    by freezing do you mean the coil is frozen in sheets or frosting on the suction line?

  6. #6
    Join Date
    Apr 2004
    Location
    Niantic, Illinois
    Posts
    545
    just reread the original post, you know unico is supposed to have six to eight supplies per ton right?

  7. #7
    Join Date
    May 2004
    Posts
    315
    what size is your return? i hope it is at least 12"

  8. #8
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,704
    As berad said, it should be a min 6 full outlets per ton newer systems, and 5 on the older systems.

    Max supply sp is 1.5 iwc, and min is 1.1 iwc.

    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  9. #9
    Join Date
    Jan 2002
    Location
    Ft.Worth,Tx
    Posts
    4,584
    Check the slide adjustment at front of Unico for tonnage settings,and I agree min. 6 supply per ton. to find some area's to install some supply..Never going to work right until S.P. is down 1.1-1.3..

    1000 cfm is max. on Unico
    "Everyday above ground, is a good day".
    "But everyday that you have made a difference in someones life, may insure you stay above ground a little longer".<aircooled>

  10. #10
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,704
    Originally posted by aircooled53
    Check the slide adjustment at front of Unico for tonnage settings,and I agree min. 6 supply per ton. to find some area's to install some supply..Never going to work right until S.P. is down 1.1-1.3..

    1000 cfm is max. on Unico
    And thats a 5 ton unit.

    He's on a 2 ton.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  11. #11
    Join Date
    Oct 2004
    Location
    The "Burgh"
    Posts
    1,255
    Summarize,

    1 word.

    Airflow......

    Check your supply plenum adapter adjustment and add more outlets.

    What is your motor amperage ? It has alot to do with Unico System set-up

  12. #12
    Join Date
    Mar 2005
    Location
    Suppy NC
    Posts
    4,513
    not enough supplies
    5 outlets per ton as long as they are under 12 ft
    better to have 6 per ton and the restricter plate cant be ajusted to proper motor anps unless the supplys are correct
    40 cfms per supply
    these are unico requirements
    have the tech read the install book if it is still with the unit

  13. #13
    Join Date
    Apr 2004
    Location
    Niantic, Illinois
    Posts
    545
    Another episode of shameful unico treatment brought to you by the Service Experts. Senior's an ok guy, but there is only a handful of guys with braincells working with him these days.

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