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Thread: Return Air

  1. #1
    Join Date
    May 2008
    Posts
    14

    Return Air

    I have a three ton upstairs unit and a 4 ton downstairs unit. I peeked in the attic today to take a look at the ductwork and noticed the installer had connected the return ducts for both upstairs and downstairs. I just wanted to double check that this is ok... The return for upstairs and downstairs do not need to be separated right?

    Thanks.

  2. #2
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,123
    They should be seperate to protect the blower motors.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  3. #3
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    The static pressure of each,will vary along with the delivered air,when both systems run ,versus one with a stanard motor.With variable speed motor,they willkeep adjusting,to deliver the correct cfms,as one chngesthe other will ,and on and on.


    If one filter gets very clogged,the others fan can rotate backwards,and then start backwards.


    Have it changed.

  4. #4
    Join Date
    Jul 2000
    Location
    Northern Wisconsin
    Posts
    2,013
    I suppose hoping that the installer installed backdraft dampers in each unit would be asking to much.
    Use the biggest hammer you like, pounding a square peg into a round hole does not equal a proper fit.

  5. #5
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    Quote Originally Posted by firecontrol View Post
    I suppose hoping that the installer installed backdraft dampers in each unit would be asking to much.
    Yah think!!!!lol

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