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  1. #14
    Join Date
    Mar 2013
    Posts
    10
    Both indoor and outdoor units are definitely 3 ton units, I checked them myself. The HVAC company changed the indoor unit from medium to high fan speed because one side of the house was cold. Maybe I should turn it back down to medium and play with the dampers instead.

  2. #15
    Join Date
    Aug 2007
    Location
    Northern VA 38 degrees N by 76 degrees W
    Posts
    5,060
    Quote Originally Posted by motoguy128 View Post
    Dpes seem too far off to me. But I could have missed something. I'm not sure what city to use, but Richmond for example is 18F winter, 92 F summer. The whole state only ranges from 10F-25F(along coast) and 90-93F.
    He is in Winchester and winter ODAT is 10 and summer is 90 with 38 grains at 50%

  3. #16
    Join Date
    Jul 2006
    Posts
    1,091
    My version of Wright J has two choices...
    Winchester Man J/N summer 90db/74wb winter 10
    or
    Winchester Rgnl ASHRAE 2009 summer 93db/74wb winter 18

    HVAC-Calc uses 90/10

  4. #17
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,287
    Was the Manual J used in permitting?

    Was the Manual J presented as part of the contract?
    If yes, put in the right equipment.

    If no, put in the right equipment.
    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities

  5. #18
    Join Date
    Jan 2009
    Location
    Keokuk, IA
    Posts
    5,520
    Quote Originally Posted by rickboggs View Post
    My version of Wright J has two choices...
    Winchester Man J/N summer 90db/74wb winter 10
    or
    Winchester Rgnl ASHRAE 2009 summer 93db/74wb winter 18

    HVAC-Calc uses 90/10
    I'd use the lower number. Airports tend to be out in the open and at a higher elevation. Unless you on a top of the hill and exposed to the sun, you'll be cooler most of the time.

    I'm for example up on a bluff at a higher elevation that other parts of hte town. On a cool calm winter day, it can be 3-5F cooler at my work which is along the river 150' in elevation lower.

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