American Standard indoor coil problem ? - Page 5
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  1. #53
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    Ductolators show the cfms at a given FR (friction rate),not static.

    You can't guess what the FR is,and determine the cfms.

    If the returns are ducted and flex is used with tri-boxes,the Fr could be as low as .04 Fr,or less so the cfms could easily be half when compared to .1 FR on the ductolator.

  2. #54
    Join Date
    Dec 2007
    Location
    Houston, TX
    Posts
    29

    Here are the CFM readings

    Installer was out this afternoon and changed the TXV. Today was not as hot as it's been, so I couldn't tell if it helped any (I don't think it did) I had him take CFM readings before he adjusted a few of the dampners. He is going to talk to his boss about re-doing the flex to the triangle box and come back to do more balancing as it was getting late and he still had 2 calls to make.

    36' of 12" OD ! hardpipe serving 1 register to kitchen 12' x 11' *210cfm*

    36' of 16" OD ! hardpipe serving 2 registers to den 18' x 18' *195cfm* & *180cfm* and 1 register to dining room 11'x10' *100cfm*

    25' of 12" OD ! hardpipe serving 1 resister to bedroom 16' x 13' *250CFM* & 1 register to bath 10' x 10' *115CFM*

    12' of 12" OD ! hardpipe serving 1 register to bedroom 10' x 14' *175CFM* with Y of 7' of 8" OD ! hardpipe to bath (forgot to get this one)

    45' of 5" flex serving 1 register to washroom (vent above refrig-couldn't get hood to ceiling)

    6' of 7" flex serving 1 register to bedroom 12' x 12' *110CFM*

    20' of 9" flex with the triangle box then 5' of 7" to bedroom 10' x 10' *150CFM* & 25' of 7" to office 14'x11' *120CFM*

    1 20 x 30 hall return *950CFM*
    1 14 x 25 ceiling return *500CFM*

  3. #55
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    Those triangle boxes should be illegal. Depending on the air velocity through them, it is like having an extra 50-75 feet of duct on the run.
    If more government is the answer, then it's a really stupid question.

  4. #56
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,631
    Totaling the CFMs you posted for the supplies, it comes out to 1605 CFM. You don't have CFMs for 2 supplies. And it still comes out to more then what he measured at the return.

    1605 CFM measured supplies, and 1450 measured return.

    Either you got a big return air leak, or he blotched his readings.
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  5. #57
    Join Date
    Jun 2001
    Location
    Louisville, KY
    Posts
    12,119
    Might be some return duct leakage.

    However, there's is most likely supply boot induction. When the boots aren't sealed to the floor or ceiling, supply air rushing through the boot causes a low pressure area. Air is sucked into the boot.

    It causes your supply readings to be high.

    It's also a big cause for inadequate cooling with a ceiling supply system.
    Perhaps you should have read the instructions before calling.

  6. #58
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,631
    True.

    But either way. Its a problem that needs addressed.
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  7. #59
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,631
    True.

    But either way. Its a problem that needs addressed.
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  8. #60
    Join Date
    Dec 2007
    Location
    Houston, TX
    Posts
    29
    All the supply registers (except 2 that are too difficult to get to in the attic) are pookied in the attic and caulked from inside at the ceiling. The main wall return is totally caulked insine and the metal transition to heater is pookied at all seams .The 2nd ceiling return is totally caulked inside and pookied in the attic.

    The cfm readings are an average as the meter on the hood did fluctuate (is this normal or poor equipment) I did question the difference between supply & return CFM. He said his hood was smaller than the 20 x 30 return and he had to block the top 6 or so inches at the grille, and that when he checked a return the hood causes a slight restriction and causes the other return to pull more.

    He did adjust some dampners and I noticed last night that a couple of registers have a choppy air flow sound and they used to be smooth & quiet,

  9. #61
    Join Date
    Jun 2001
    Location
    Louisville, KY
    Posts
    12,119
    Your home is one of the few to be sealed in that manner.
    Perhaps you should have read the instructions before calling.

  10. #62
    Join Date
    Dec 2007
    Location
    Houston, TX
    Posts
    29
    Quote Originally Posted by jrbenny View Post
    Your home is one of the few to be sealed in that manner.
    Thats

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