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  1. #1
    Join Date
    Apr 2003
    Location
    Northern Virginia, Fairfax County
    Posts
    641
    My son is getting ready to replace a system in his townhouse.

    The Copeland Scroll UltraTech features two stage operation where the first stage works at 67% of full load. About a month ago, someone here said that some scroll compressors have the first stage working at about 80% of full load. True?

    What HVAC brands use the Copeland at 67% and what brands run at other specified loads? And if there are 80% models, what are the good reasons for that split? The 67% seems to make more sense to me.

    Thanks,
    Al

  2. #2
    Join Date
    Nov 2000
    Location
    Eastern PA
    Posts
    68,865
    Don't know of an 80% model. Maybe the poster was mistaken.
    Government is a disease...
    ...masquerading as its own cure…
    Ecclesiastes 10:2 NIV


  3. #3
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    All of the Copeland 2 stage scroll compressors operate at 67% capacity in 1st stage.

    Trane and some other manufacturers operate the fan at 80% in first stage in thier 2 stage scroll systems. Some manufacturers match the airflow more closely to the 1st stage compressor capacity.
    If more government is the answer, then it's a really stupid question.

  4. #4
    Join Date
    Apr 2003
    Location
    Northern Virginia, Fairfax County
    Posts
    641
    Thanks for the clarifying replies.

    Are there any scroll OEMs other than Copeland for residential HVAC?
    AL

  5. #5
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    33,427
    Scrolls are made by all the comp makers. Don't know of anyone using Tecumseh scrolls in residential but certainly Bristol/Benchmark/Scroll Tech and Alliance (A-S/Trane/Heatcraft/Copeland). Alliance makes an unloading scroll like the Copeland. I don't think Scroll Tech which is a joint venture between Bristol & Carrier/Carlyle does yet.


  6. #6
    Join Date
    Apr 2004
    Posts
    7,680
    Dont confuse the compressor capacity with the system capacity. The copeland two stage is an unloading compressor and drops the capacity of the compresor to 67%. The system as a whole may be closer to 70 ot 75%. Its not linear.

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