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  1. #1
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    Lineset Calculation Help

    I've got an 150ft lineset, and I'm needing to know how to calculate how many ounces of r-22 are in a 3/4" and 7/8" copper line per foot so I can calculate approximate refrigerant needed.

  2. #2
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    Your instillation instructions should have it in there along with the proper line size. 150ft with the sizes you stated seems a little small for the suction line to me or is this the liquid line?

  3. #3
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    Apr 2001
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    The rating plate charge of a given outdoor unit is for a standard
    application of 15 ft of tubing.

    Add 0.6 oz of Refrigerant 22 per ft of 3/8-in. liquid line over 15
    ft. to the data plate's rating charge

    Hence,
    150 feet minus 15 feet = 135 feet
    135 feet X 0.6 oz = 81 ounces
    Therefore, 81 ounces is added to the data plate's rating charge.

    Hey, I can't help it if you didn't charge enough!
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  4. #4
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    Quote Originally Posted by BigJon3475 View Post
    Your instillation instructions should have it in there along with the proper line size. 150ft with the sizes you stated seems a little small for the suction line to me or is this the liquid line?

    this isn't an installation boss. If I had installation instructions, that had that information in it I wouldn't be on here......nevermind , I'll find out.


    *It's a Liebert unit with a remote condensor the lineset is the discharge and liquid line, I know the application, just wanted to know the volume.

  5. #5
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    Quote Originally Posted by ididntdoit View Post
    this isn't an installation boss. If I had installation instructions, that had that information in it I wouldn't be on here......nevermind , I'll find out.


    *It's a Liebert unit with a remote condensor the lineset is the discharge and liquid line, I know the application, just wanted to know the volume.
    Relax. The above post is correct for your liquid line but the discharge and the liquid line are one in the same although I have .58 oz's per foot instead of .6. The suction line per foot in oz's even though it's minimal.

    1 3/8" .22
    1 1/8" .15
    7/8" .08
    3/4" .06
    5/8" .04

  6. #6
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    Quote Originally Posted by Jabarco View Post
    The rating plate charge of a given outdoor unit is for a standard
    application of 15 ft of tubing.

    Add 0.6 oz of Refrigerant 22 per ft of 3/8-in. liquid line over 15
    ft. to the data plate's rating charge

    Hence,
    150 feet minus 15 feet = 135 feet
    135 feet X 0.6 oz = 81 ounces
    Therefore, 81 ounces is added to the data plate's rating charge.

    Hey, I can't help it if you didn't charge enough!
    OK, WAYYY off course people. I said 3/4" and 7/8". This is not a new install, this unit leaked its entire charge. This is commercial guys, not pre-charged systems. But like I said Nevermind

  7. #7
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    Quote Originally Posted by BigJon3475 View Post
    Relax. The above post is correct for your liquid line but the discharge and the liquid line are one in the same although I have .58 oz's per foot instead of .6. The suction line per foot in oz's even though it's minimal.

    1 3/8" .22
    1 1/8" .15
    7/8" .08
    3/4" .06
    5/8" .04

    Thank you very much....BUT, my discharge and liquid are not the same..discharge is gas, liquid is liquid.

  8. #8
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    Quote Originally Posted by BigJon3475 View Post
    Relax. The above post is correct for your liquid line but the discharge and the liquid line are one in the same although I have .58 oz's per foot instead of .6. The suction line per foot in oz's even though it's minimal.

    1 3/8" .22
    1 1/8" .15
    7/8" .08
    3/4" .06
    5/8" .04
    Ok, these aren't right.

  9. #9
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    Quote Originally Posted by ididntdoit View Post
    Ok, these aren't right.
    They are for suction line and R-22 in vapor.

  10. #10
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    Apr 2007
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    Quote Originally Posted by ididntdoit View Post
    Thank you very much....BUT, my discharge and liquid are not the same..discharge is gas, liquid is liquid.
    You need to know how much refrigerant is in the hot gas line before it goes through the condenser?

  11. #11
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    Quote Originally Posted by BigJon3475 View Post
    They are for suction line and R-22 in vapor.
    ok well then my 3/4"liquid isnt right then.

  12. #12
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    Apr 2001
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    669
    Attachment 2378
    Quote Originally Posted by ididntdoit View Post
    OK, WAYYY off course people. I said 3/4" and 7/8". This is not a new install, this unit leaked its entire charge. This is commercial guys, not pre-charged systems. But like I said Nevermind
    Oh, it's commercial? Then why didn't you say? I have that formula too but like you said; I'll nevermind.

    Jabs

    Hey, I can't help it if you......
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  13. #13
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    Apr 2007
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    Rossland, B.C.
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    Does the unit have a site glass? If not add one then charge it while running . Then mark what the charge is for the next time

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