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  1. #1
    Join Date
    Jul 2005
    Posts
    15
    I am installing a 25 ton condenser , it already has a freon charge but for only 15 feet of lines.I am running 30 feet of lines, what method should I use to calculate the additional freon need (aside from Super heat/Supper cool method.


  2. #2
    Join Date
    Jul 2005
    Posts
    15
    Correction that's 2.5 tons

  3. #3
    Join Date
    Apr 2004
    Posts
    7,680
    What size liquid line? Add .6 oz per foot for 3/8. Of course you read that in the instructions.

  4. #4
    Join Date
    Feb 2004
    Posts
    2,597
    i always end up with "supper cool" when i work late.

  5. #5
    Join Date
    Jul 2002
    Location
    Zelienople, Pa
    Posts
    2,965
    This is the only method...
    How tall are you Private???!!!!

  6. #6
    Join Date
    Nov 2000
    Location
    Eastern PA
    Posts
    68,964
    Unless you have exact capacity data on the indoor coil and the lineset "AND" the outdoor unit has a precise charge in it "AND" there are no variables such as filter/driers added to the system, you are best to adjust the refrigerant to proper superheat or subcool depending on the systems metering.

    Even if you are perfect on the weigh in charge, the air flow of the indoor and outdoor units must both be exactly as specified for the system to be operating at it's optimum.
    Government is a disease...
    ...masquerading as its own cure…
    Ecclesiastes 10:2 NIV


  7. #7
    Take your sub cool reading on 22 take 68 to 70 reading on low side of gage

  8. #8
    igwt777 is offline Professional Member - T&B bad email address
    Join Date
    Jul 2005
    Posts
    172
    Originally posted by dancsurf
    I am installing a 25 ton condenser , it already has a freon charge but for only 15 feet of lines.I am running 30 feet of lines, what method should I use to calculate the additional freon need (aside from Super heat/Supper cool method.

    First Step is to know the exact ammount of refrigerant you have on that system and add refrigerant by the manufacturers instructions table (to compensate for the extra lineset). If you don't have that info 100% correct, the only way to charge it properly is by using SH (fixed metering) / SC (TXV metering) method.

    Hope this help.




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