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Thread: the Low is Hi

  1. #1
    Join Date
    Oct 2004
    Posts
    15

    Hi everyone,

    need some help,split system 2.5 ton the condensing unit
    is clean so is the evap coil and the indoor blower.
    The outside temp is 93F,suply air 67F return
    air 80F hi side psi 220 lo side psi 90 psi,

    Where would be the problem since the low side
    is at 90psi?

    thanks for any help.

  2. #2
    Join Date
    Mar 2005
    Location
    Suppy NC
    Posts
    4,510
    may not be a problem
    heavy load and the suction presure may drop to normal as the inside load drops

  3. #3
    Join Date
    Nov 2000
    Location
    Eastern PA
    Posts
    68,864
    Sounds like an oversized metering issue. At those load conditions the head is also low. What are the condensing unit and indoor coil models?
    Government is a disease...
    ...masquerading as its own cure…
    Ecclesiastes 10:2 NIV


  4. #4
    Join Date
    Dec 2003
    Location
    Location!, Location!
    Posts
    929
    R-22?

    93°F and 220 psi? kinda low
    67°F and 90 psi?


    low charge and vapor at the restrictor or wrong size restrictor?

    ΔT = 13°

  5. #5
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    What are the superheat and subcooling

    We ALWAYS need the superheat and subcooling. Without them, we can't even make an informed guess about what the problem is...

    Knowing what type of metering device the indoor coil has is handy info too.
    If more government is the answer, then it's a really stupid question.

  6. #6
    Join Date
    Jun 2003
    Location
    Florida
    Posts
    9,548
    Once you get that superheat and subcool measurements,you have to check that airflow.....13 degree delta t is way low.Busted ductwork,wrong fan speed,etc.
    If everything was always done "by the book"....the book would never change.

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