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  1. #1
    I'm hoping someone can help with a decision my tech and I are trying to make...for a 5-ton American Standard split system, what is the smallest diameter copper tubing that would be acceptable for the low pressure side fo the lineset? 1" or 7/8"? The distance between the evap coil and the condenser is approx 30 feet.

  2. #2
    Join Date
    Feb 2004
    Location
    atlanta
    Posts
    120
    7/8 will be ok but 1 1/8 is preferred.

  3. #3
    Join Date
    Jul 2003
    Location
    ALABAMA
    Posts
    230
    I agree 1 1/8. But 7/8 should work for 30 feet.

  4. #4
    Join Date
    Oct 2004
    Posts
    3,400
    If this is new construction, or accessable for changeout, then use the larger tube.

    The 7/8 will work, but I'm pretty sure there must be a good reason for the larger size being recommended by the manufacturer.

    Noise?
    Efficiency?

    Sale on 1 7/8" service valves?(I doubt it.)

  5. #5
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    Check the mfrs data,their may be a small capacity loss as well.

  6. #6
    Join Date
    Jun 2005
    Posts
    64
    make sure to use a longthrow copper 90's where needed. i use longthrows on anything bigger than 5/8

  7. #7
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,074
    It may require the 1 1/8" to get its seer rating.
    Read the install manual and use what it recommends.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

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