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  1. #1
    Join Date
    Jul 2011
    Posts
    71

    Evolution AC Airflow Setting

    Howdy guys-
    I have an Evolution furnace (355CAV 80K BTU) with Evolution control. My AC unit is just a single stage 3-ton (non-Evolution) Bryant 116B.

    I have 4 settings on the stat for airflow control during AC operation:

    Comfort (default): This one appears to run the furnace fan at a lower speed for a while before kicking it up a notch. I assume it is to help dehumidify a little more?
    Efficiency 325: I assume this means 325CFM/ton (975CFM)
    Efficiency 350: I assume this means 350CFM/ton (1050CFM)
    Maximum: 400CFM per ton (based on the manual)

    Just curious why there are two Efficiency settings and what are the pros/cons of each? Any thoughts?

  2. #2
    Join Date
    Apr 2008
    Location
    Alberta Canada
    Posts
    2,246
    the lowest setting is for dehumidification, it basically overcools, where as 400 cfms will get air there quickly but leave some more humdity in air. Some people like strong fan, some people like to have more control over humidity
    I pick lower humidity
    Do it right the first time.

  3. #3
    Join Date
    Jul 2011
    Posts
    71
    Thanks for your feedback.

    Would the 350CFM/ton setting be more efficient at cooling that the 325CFM/ton setting for my 3ton unit (assuming the difference in humidity is negligible)?

  4. #4
    Join Date
    Jul 2011
    Posts
    71
    FWIW:

    Air Handler: Bryant CAC/BDP CNPVP3617ACA
    Outside Unit: Bryant 116BNA036000

    Thanks!

    Clocker

  5. #5
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    6,643
    What is your indoor %RH and where do live?
    Regards TB
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
    Use +Merv 10 air filter. -Don't forget the "Golden Rule"

  6. #6
    Join Date
    Jul 2011
    Posts
    71
    Quote Originally Posted by teddy bear View Post
    What is your indoor %RH and where do live?
    Regards TB
    ~43%

    SE Michigan

    Thanks!

  7. #7
    Join Date
    Jul 2002
    Location
    37760
    Posts
    420
    The way I compare it from UTC's product data @ TVA specs;

    1350 cfm = 25.72btu sensible @3.04kw 25.72/3.04=8.460
    1200 cfm = 24.22btu @2.98kw 24.22/2.98=8.127
    1050 cfm = 22.63btu @2.92kw 22.63/2.92=7.75

    looks to me like more sensible btu bang for buck at higher airflow.
    [They do not provide test data @ 325 per ton.]

    Please correct me if I'm wrong.

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