Scroll compressors
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  1. #1
    Join Date
    Nov 2007
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    Rio Rancho, NM
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    Scroll compressors

    In another thread I mentioned that only one contractor had actually taken measurements and inspected insulation etc, then used software to size a replacement system for my house. 4 or 5 others based their proposals on the size of the existing furnace or the size of the house as I remembered it. (Of course, realtors measure the outside of the house, and it was like 1850 sq ft when I bought it, but with 1 foot thick walls the inside is only 1511 sq ft).

    Anyway, the guy who did the measurement and prescribed a considerably smaller furnace and AC than the others is a Carrier dealer. In this case, the AC has a reciprocating compressor instead of a Scroll. Should I care about that? From what I read, scrolls are much more reliable.

  2. #2
    Join Date
    May 2000
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    Indianapolis, IN, USA
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    I don't think Carrier uses recips in anything these days.

  3. #3
    Join Date
    May 2007
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    DC Metro Area (MD)
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    3,367
    Perhaps you were quoted the Infinity 17 (24ANA7), which uses a two-stage reciprocating compressor.

  4. #4
    Join Date
    May 2004
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    1,462
    Quote Originally Posted by BaldLoonie View Post
    I don't think Carrier uses recips in anything these days.
    The only recip Carrier uses is in one of the Infinity two stage units, a Bristol TS which has been very reliable.
    If all else fails....Try reading the directions!

    Tell it like it is and let the chips fall where they may.

    Any views or opinions stated here are strictly my own.


  5. #5
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    Nov 2007
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    Rio Rancho, NM
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    The quoted condenser was indeed the 24ANA736A003, hence not a scroll.

    What about the statement that "a scroll wears in, a reciprocating unit wears out"?

  6. #6
    Join Date
    Mar 2005
    Location
    burlington county n.j.
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    Quote Originally Posted by cokoliso View Post

    What about the statement that "a scroll wears in, a reciprocating unit wears out"?

    was told that same exact phrase at a training class years ago, have not seen anything to prove it wrong........

  7. #7
    Join Date
    Apr 2007
    Location
    Derwood, Md
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    142
    Quote Originally Posted by cokoliso View Post
    The quoted condenser was indeed the 24ANA736A003, hence not a scroll.

    What about the statement that "a scroll wears in, a reciprocating unit wears out"?
    I have the equivalent Bryant model and I am happy with. It does has better split between High/Low compared to the equivalent scroll.
    I went through the same analysis and did a lot of reading. Here is an interesting paper from Bristol:

    http://www.bristolcompressors.com/in...te%20Paper.pdf

  8. #8
    Join Date
    Mar 2006
    Location
    Delaware
    Posts
    448
    A surprising number of high end units still run piston compressors. Mostly the Bristol TS, and I think Trane runs a pair of piston compressors in the XL19i, but I am not all that sure about that one.

    In theory, scrolls are more forgiving of mistakes, like liquid slugging, dirt, etc., but those are gross installation errors anyway, and even a scroll may not survive forever in these cases.

    Quote Originally Posted by cokoliso View Post
    In another thread I mentioned that only one contractor had actually taken measurements and inspected insulation etc, then used software to size a replacement system for my house. 4 or 5 others based their proposals on the size of the existing furnace or the size of the house as I remembered it. (Of course, realtors measure the outside of the house, and it was like 1850 sq ft when I bought it, but with 1 foot thick walls the inside is only 1511 sq ft).

    Anyway, the guy who did the measurement and prescribed a considerably smaller furnace and AC than the others is a Carrier dealer. In this case, the AC has a reciprocating compressor instead of a Scroll. Should I care about that? From what I read, scrolls are much more reliable.

  9. #9
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    33,833
    Oh yea, forgot about that sucker. Personally I like the idea of the 50/50 staging of that one vs the scroll which in net effect is more like 80/20.

    Where's dash? He'll tell you that's a good choice

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