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  1. #1
    Join Date
    Mar 2010
    Posts
    19

    charging calculation formula

    what is the charging calculation formula used when 25 feet pre-charged line set R-22 is extended to 50 feet ?

    how much more refrigerant needed to the additional 25 feet line set without refrigerant in it ?

  2. #2
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,426
    What type of metering device?

    What are the indoor conditions, outdoor conditions?

    Type of refrigerant doesn't matter.

  3. #3
    Join Date
    Dec 2002
    Location
    Arizona
    Posts
    4,341
    Quote Originally Posted by jpsmith1cm View Post
    What type of metering device?

    What are the indoor conditions, outdoor conditions?

    Type of refrigerant doesn't matter.
    Not to mention what is the line set size!
    Make your expertise uniquely valuable.

    Make your influence uniquely far-reaching.

  4. #4
    Join Date
    Mar 2006
    Location
    Denver/Boulder
    Posts
    2,215
    Sorry, panaboro.

    No DIY help to non pro members.

    Read site rules and apply for pro status if you qualify.
    What lies behind us and what lies before us are small matters compared to what lies within us.


    Two pressures, four temperatures = SUCCESS!


    Boulder Heating Contractor


    For Consumers:

    For HVACR Professionals:


  5. #5
    Join Date
    Mar 2010
    Posts
    19
    Quote Originally Posted by panaboro View Post
    what is the charging calculation formula used when 25 feet pre-charged line set R-22 is extended to 50 feet ?

    how much more refrigerant needed to the additional 25 feet line set without refrigerant in it ?
    3/8 liquid and 7/8 suction with TXV. there is no mention indoor/outdoor condition. but i guest will be standard design temperature 95*outdoor and 75* indoor 50% RH


    I had a test question a month ago that i can't find the answer in my book.


    thanks

  6. #6
    Join Date
    Mar 2010
    Posts
    19
    I want to find the answer for a test question i had a months ago.
    i can do subcooling or superheat but its a test.
    thanks

  7. #7
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,426
    I'm sorry, I misread the question.

    This is actually a queston regarding the volume added to the lineset and the density of the refrigerant.

    The BEST way to correctly charge a unit is to use superheat or subcooling depending on the metering device.

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