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Thread: What is this???

  1. #1
    Join Date
    Oct 2009
    Location
    Mukwonago, WI
    Posts
    235

    What is this???

    Plan called for economizer mixing boxes to be installed on the bottom of the furnace, with the return air coming out the side, and the OA coming out the back. This is what we got.

    • 5 ton systems, not sure what kind of mixing boxes these are, but they aren't right. oa choked down to 6/24 and return air choked to 8/24.
    • On two of the units, the mixing box is install on the OA duct, left side of furnace, the return is ducted into the right side of the furnace.
    • Why bother to glue the vent piping???
    • The OA intakes are supposed to be 16/20 with 1/2" mesh on the inlet, we get resi style inlet hoods. yup, that will work.



    The condensers arn't even wired (low voltage) and this contractor called the job done. There is also a 10 item punch list from the engineer. I found 8 more things he missed.
    How do these guys live with themselves
    Attached Images Attached Images      

  2. #2
    Join Date
    Dec 2010
    Location
    The Quad-Cities area (midwest).
    Posts
    2,702
    With 5 ton systems the return needs to go into both sides, bottom or bottom/side combination. I did a bottom/side installation for my 3 ton system. It's just me!

  3. #3
    Join Date
    Oct 2009
    Location
    Mukwonago, WI
    Posts
    235
    yea, but there isn't return air ducted into both sides.

  4. #4
    Join Date
    Dec 2010
    Location
    The Quad-Cities area (midwest).
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    2,702
    Quote Originally Posted by Miller257 View Post
    yea, but there isn't return air ducted into both sides.
    It's hard to tell from the pictures. One furnace (on the right) for sure is incorrect. The other picture (of the other furnace) looks like there is a return "drop" on both sides.............but it's not clear.

  5. #5
    Join Date
    Oct 2005
    Location
    Indiana
    Posts
    22
    Also looks like the flue terminations are not factory approved.

  6. #6
    Join Date
    Jan 2013
    Location
    Champaign Illinois
    Posts
    97
    Looks like 10 lbs of s@&$ in a 5 lbs bag. I would have put furnaces on pedestal boxes to get side and bottom air flow. Guess you get what u pay for. Cheepest bid doesn't equal best work.

  7. #7
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    4,052
    i dont believe there is any furnace (trane, carrier, lennox, rheem...) that you can get 2000cfm out of the side.

    it either needs to be both sides cut into, a side and a bottom or just the bottom

  8. #8
    Join Date
    Oct 2009
    Location
    Mukwonago, WI
    Posts
    235
    Quote Originally Posted by Jkb79 View Post
    Looks like 10 lbs of s@&$ in a 5 lbs bag. I would have put furnaces on pedestal boxes to get side and bottom air flow. Guess you get what u pay for. Cheepest bid doesn't equal best work.
    They were supposed to be mounted on a mixing box with return out of the side and OA out of the back, guess he can't read plans either.

  9. #9
    Join Date
    Jan 2013
    Location
    Henry county,ky
    Posts
    82
    Residential hacks I swear. If you'll cant do any type of commercial, stay off the porch. Well, wait, never mind. Find a new career
    " dirty filter??!!! Buts its only 2 years old" You never learn everything you need to know is this industry

  10. #10
    Join Date
    Jun 2002
    Location
    south jersey
    Posts
    1,104
    Is this a strtup you were doing for the company you work for? Install guys work with your company?
    You need to put the phone down and get back to work!

  11. #11
    Join Date
    Feb 2006
    Location
    Float'N Vally, MS
    Posts
    1,836
    Quote Originally Posted by Miller257 View Post
    • 5 ton systems, not sure what kind of mixing boxes these are, but they aren't right. oa choked down to 6/24 and return air choked to 8/24.
    • On two of the units, the mixing box is install on the OA duct, left side of furnace, the return is ducted into the right side of the furnace.

    • The OA intakes are supposed to be 16/20 with 1/2" mesh on the inlet, we get resi style inlet hoods. yup, that will work.


    There is also a 10 item punch list from the engineer.
    So this job was "designed" by the in jun ear?
    He sized the ductwork?
    Life is too short, Behappy!
    TFMM

  12. #12
    Join Date
    Oct 2009
    Location
    Mukwonago, WI
    Posts
    235
    haha it was a bid spec job, that the installing contractor decided to re-engineer.

  13. #13
    Join Date
    Feb 2006
    Location
    Float'N Vally, MS
    Posts
    1,836
    Quote Originally Posted by Miller257 View Post
    haha it was a bid spec job, that the installing contractor decided to re-engineer.
    He would be in deep do do here.
    Life is too short, Behappy!
    TFMM

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