Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Freon Line

Kevin_12 Member Posts: 31
A good rule of thumb is use the size of line that the service valve has. fyi the term rule of thumb is derived from old days where men were allowed to beat their wife with a stick no bigger than their thumb.


  • DennisDe
    DennisDe Member Posts: 16
    Freon Line

    If I have a freon line "SL 5/8, LL 3/8" can I run a 2.5 ton 14 seer unit on this line approx. 50ft? Does the linset have to be changed to a "3/4, 3/8" or is there wiggle room
  • Earthfire
    Earthfire Member Posts: 543
    line set sizing

    The manufacturer has the required lineset sizing speced in the installattion instructions. Deviating from them will cause the unit to not operate at peak efficency and will make for an unhappy customer and void the factory warranty. Always follow the manufacturers installation instructions. The cost of a coil of copper tubing is cheap insurance. Another item to look out for is required clearances to the structure and overhangs. A lot of installs ignore these and have problems with hot weather operation.
  • freon lines

    Go with the 3/4 O.D. suction and 3/8 liquid. Smaller line set will cause pressure and oil return problems.
  • Paul Mitchell
    Paul Mitchell Member Posts: 266

    Check the manufacturer specs. But most up to 3 ton need 3/4 3/8. Also to get a true 14 seer you have to match the coil and condenser. If you leave an old coil then it isnt 14. Also verify duct size and returns etc. If these things are wrong then it wont really be 14 seer either.

    To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Contractor"
This discussion has been closed.