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Thread: Copper Size

  1. #1
    Join Date
    Mar 2006
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    Florida
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    Cool

    I'm about to replace my old 2ton with a heat pump system, like a bryant 698bnx,however my copper size is 1/4 and 5/8.
    will my existing copper be compatible with the new system or will it be undersized? if undersized what % degradation to the SEER rating will be applied?
    thanks,Bill

  2. #2
    Join Date
    Jun 2004
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    459

    size?????/

    Not able to tell you what size you need, for 2 reasons: 1)would be in violation of site rules, 2)I'm not there for the install. However, can tell you this, what you now have is a hack install.

    Your installing contractor will (or should) size you correctly.

  3. #3
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    Not necessarly a hack job. Some older Rheem units used that size lines .

  4. #4
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    Mar 2006
    Location
    Florida
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    Cooper size

    Looking at cost and ease of copper replacement.Trying to do some discission making based on % degradation vs additional cost and running a chase down the side of the old house(don't like the esthetics of the chase).Believe the unit I referenced is 3/8 and 5/8 copper.
    Everything in life is a trade off and I'm looking at my options.
    Thanks,Bill

  5. #5
    Join Date
    Jul 2002
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    Zelienople, Pa
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    Not just a loss of efficiency and capacity, but a loss of warranty after you start losing compressors due to the wrong lineset size.
    Do it correct from the beginning and have ease of mind...

  6. #6
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    For sure it should be replaced. DO NOT use the old line set.

  7. #7
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    Jan 2006
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    186
    Good choice for going with a het pump!!!

  8. #8
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    Near Atlanta, GA.
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    Rheem/Ruud of years past did indeed use 1/4" liquid line even on some larger units. I never liked it myself.

    Change the line set.
    1-it's the wrong size
    2-why put a nice new system on old dirty copper. Penny wise-pound foolish. If you go with an R-410 system the oil in the old lines will be incompatable with the new system anyway.

  9. #9
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    Feb 2004
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    Central Kansas
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    The 698 series is R-410a and it is quite a gamble to reuse an old lineset without being able to properly flush out any residual oils or other contaminates. A little thing similar to parrafin could develop when the different oils mix. This could lead to blockages- you don't want your new system constipated, right? This is not a cheap, low end unit you're planning to use so don't cut important corners. And, I would say the lineset is incorrectly sized for a 698 or any current Bryant of that tonnage. We will all know more when more of the new model lineups start to appear.
    Don't confuse me with facts, my mind is already made up.

  10. #10
    Join Date
    Jun 2003
    Location
    Florida
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    Definitely recommend new copper,properly sized,that way you have a new system. Do you have any downspouts/gutters on the house?You can also run the lineset in a gutter chase the same color as the house near a corner, should look fine.
    If everything was always done "by the book"....the book would never change.

  11. #11
    Join Date
    Mar 2006
    Location
    Tampa,FL.
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    107
    Originally posted by home owner-70
    I'm about to replace my old 2ton with a heat pump system, like a bryant 698bnx,however my copper size is 1/4 and 5/8.
    will my existing copper be compatible with the new system or will it be undersized? if undersized what % degradation to the SEER rating will be applied?
    thanks,Bill
    Your liquid is the most important line 1/4 is kind of small could cost you a compressor!

  12. #12
    Join Date
    Jun 2003
    Location
    Florida
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    Originally posted by tony82164
    Originally posted by home owner-70
    I'm about to replace my old 2ton with a heat pump system, like a bryant 698bnx,however my copper size is 1/4 and 5/8.
    will my existing copper be compatible with the new system or will it be undersized? if undersized what % degradation to the SEER rating will be applied?
    thanks,Bill
    Your liquid is the most important line 1/4 is kind of small could cost you a compressor!
    I believe you mean the suction line.....
    If everything was always done "by the book"....the book would never change.

  13. #13
    Join Date
    Mar 2005
    Location
    Houston, Texas
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    11,874
    Thinking back, I can remember the old Fedders had 5/8 & 1/4 " lines . Seems like they ran a 300-350 head pressure when it was running correctly.

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