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  1. #1

    Air handler sizing question

    We are in the process of having a new system installed. Tonight I went up to check out what they had done and had a question: I was told by one person who came to give us a quote that we had to get a new air handler because the old one would not match the new condenser. I was told that he knew they would not match because I had a 17.5" cabinet (he called it a B cabinet) and I needed a C cabinet. We went with a different guy (who also said we needed a new air handler) - but as I look tonight, I notice that the new air handler is still a 17.5". Does this mean that the new system does not match? Through research I have been able to figure out that it is a 3.5 ton (which matches the outside unit being installed)...but does the cabinet size need to match like the other guy said? How can I determine if the air handler and condenser match? The new unit models are as follows:
    Bryant Air Handler - CNPHP4221AT
    Bryant condenser - 310AAV042090
    THANKS for any pointers - I have learned so much through this, but have so much more to go

  2. #2
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,273
    http://www.ahridirectory.org/ahridir...ultSearch.aspx

    Request the AHRI number

    and/or
    Use the link
    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

  3. #3
    Thank you for the link! Will be doing some more research.

  4. #4
    Join Date
    Aug 2010
    Location
    Denver, PA
    Posts
    32
    Are they replacing your outdoor unit also?

  5. #5
    yes - with a Bryant also (Model #13ana042-c). I know that I read they needed to all match - just am still trying to figure out how to know if these do in fact all match (other than just taking the word of the sales guy). Thanks for any advice - I am still trying to find the AHRI # as previously suggested.

  6. #6
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,273
    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

  7. #7
    Join Date
    Nov 2003
    Location
    Skiatook, OK
    Posts
    322
    The A-B-C cabinet are different sizes to fit the duct work the coils in side are rated for tonnage the smaller the cabinet the taller the coils are to match the rating( heat transfer
    area will be the same on all the sizes to match the tonnage) you would match the cabinet to the closet/plenum- wouldn't use a C cabinet (21") on a 17 1/2" plenum would
    you?
    Don't annoy the combat veteran!!!!
    All gave some - Some gave ALL

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