Checking charge on a Fujitsu mini split,ac charging ductless
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  1. #1
    Join Date
    May 2011
    Posts
    27

    Checking charge on a Fujitsu mini split,ac charging ductless

    I hardly come across mini splits. Been doing this for 15 years. Wondering how to check the charge it is a 410A system with 3 circuits. There are 2 larger schrader valves on each circuit. I assume one is the high and low side. Do I have to turn them all down and check each circuit or just one. Any ideas or a link on what to do would be great! It is a 12RLS model specifically a AOU12RLS.

  2. #2
    Join Date
    Mar 2011
    Location
    Galveston Texas
    Posts
    530
    the only way to positively be sure of the charge on a residential mini-split is by weight.

  3. #3
    Join Date
    May 2011
    Location
    Southern Indiana
    Posts
    97
    cuchulain is correct. I just clean em and check air temps.

  4. #4
    Join Date
    Jan 2009
    Location
    Fairfield county Connecticuit
    Posts
    778

  5. #5
    Join Date
    Jul 2004
    Location
    Massachusetts
    Posts
    6,829


    X-2

  6. #6
    Join Date
    May 2007
    Location
    Dry as a bone Tucson
    Posts
    4,170
    Some Talk, Some Do
    "keeping condensing pressures low and evaporator pressures high"
    Comfort is my goal
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  7. #7
    Join Date
    Aug 2012
    Location
    ga.
    Posts
    9

    mini split charging procedures

    does any one know a common delta T? I am seeing about 25-30 across indoor coil. Or does any one know commom running characteristics when in "Test Mode" forced cooling. I have one I have been working on that went out on 'disharge temp sensor' recovered charge and weighed back in proper amount after trying to play around with the charge. Now im seeing that is runs under 95 psi, to 85 psi when its running at full capacity and its 74 inside. Just seems abnormal to me, but I am letting it 'do its thing.' hopefully no more problems will arise. Found that it had 7 oz. Extra r-410a in the system, are that THAT critical??

  8. #8
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    If it is a variable capacity unit, hopefully it has a test or check operation mode that will kick back an error code if it is not happy with the amount of refrigerant it has.
    Otherwise there isn't really a way to tell if it is correctly charged.
    If more government is the answer, then it's a really stupid question.

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