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  1. #1

    Refrigerant Charge Calculation

    How is the amount of refrigerant determined for a system by design.

  2. #2
    Join Date
    May 2000
    Location
    Urbandale IA. USA
    Posts
    4,942
    For AC units, there is USUALY a line on the model plate that tells what the charge is for a 15ft line set.
    Some list LBs and OZs, others just list OZs.
    Older units probably won't list any charge.
    That is when you use superheat and subcooling.....
    Those who dance, appear insane to those who do not hear the music.
    Those who believe, appear ignorant to those who do not know God.

  3. #3
    Join Date
    Dec 2008
    Location
    Southeast MIssouri
    Posts
    64
    you add 3 oz per 5 ft. of 3/8 liquid line after first 15 ft. which equates to .6oz per ft.

  4. #4
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,375
    He may be asking how to determine charge on a build up system.

    Or DIY advise.

    Sorry, no DIY.

    Thread closed.
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