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  1. #66
    Join Date
    Apr 2008
    Location
    Princeton, NJ
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    581
    Quote Originally Posted by beenthere View Post
    What is the static in the plenum above the coil.
    I beleive it was 0.55.
    It will be comfirmed in about 2 hours when I meet the duct tech.
    Key1

  2. #67
    Join Date
    Apr 2008
    Location
    Princeton, NJ
    Posts
    581
    Quote Originally Posted by beenthere View Post
    The trunks static is best checked with all of its dampers open. To know how well it is carring the air. A full load test.
    ....Also With all dampers open everywhere the TESP was 0.92

    Key1

  3. #68
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,913
    With all dampers open, you will probably see a drop in your duct pressure from one end to the next. And between your plenum and duct.
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  4. #69
    Join Date
    Jun 2005
    Location
    SW Wisconsin
    Posts
    4,975
    Quote Originally Posted by key1cc View Post
    ....Also With all dampers open everywhere the TESP was 0.92
    Key1
    That's a high 0.37" drop through the E-Coil, check to see what that specific wet &/or dry E-Coil drop is suppose to be. It may be lint clogged, if so, clean the blower wheel blades too. - udarrell

  5. #70
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,913
    If its lint clogged in 4 weeks, fix the dryer vent line.
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  6. #71
    Join Date
    Apr 2008
    Location
    Princeton, NJ
    Posts
    581
    The new HVAC tech came today and he seemed to be very knowledgeble. Maybe it was one of you pro's from this site that got tired of this long post and decided to come and solve the problem yourself. Beenthere?

    Anyway he spent 1.5 hours going over my system (he indicated he had never met a customer that was as knowlegable in this area as I am. I told him I learned at the University of "HVAC-Talk.com" .

    He pointed out additional errors from my install beyond those I have already posted on this site. For one, they did not bother to put a trap in and he reccomended something called an EZ-trap.

    He also had issues with my ADP coil and told me I can expect leaks in a year or two with the high pressure 410a but it is still better than the trane coil...and Trane knows and he expects an improved version within the year.....but that's another story.

    To the issue at hand. He said my issues are rather easy since they can all be addressed in the unfinished basement.

    Basically I have two supply trunks delivering air (the 3rd is closed off as I have no intention of directily heating/cooling the garage area). Of the two, one is 8x9 rectangular and has five seperate round 5" runs that lead to 5 differrent locations throughout the house. The 2nd is 12x9 rectangular and has 11 seperate 5" round runs that lead to 11 different locations through out the house.

    He said the 8x9 trunk is capable of moving 450 CFM but the 5" runs are only capable of moving 50 CFM each. Since I have 5 runs on that line it means only 250 CFM capacity is being utilized even though the trunk can move 450. He said the 5 inchers can easily be replaced with six inchers because they all connect to 6 inch oval duct right before leaving the basement area. (he said 6" oval ducts can handle the flow of up to 8" round pipe).

    He said with 6" runs replacing the 5" runs, each one can move 75CFM so now 375 CFM can move through that trunk instead of 250 CFM.

    Same story for the other trunk except I am already at CFM capacity. He said the 12x9 trunk can move 550 CFM and my 11 seperate 5 inch runs already total to 550 so increasings those runs to 6 inches provides no beneifit.

    I beleive this is where Beentheres helper duct comes in and saves the day.
    Since it can be attached to the plenum and pull another additional X CFMs to add to the 550 CFMs in trunk 2

    The tech beleives if I have these changes made it should significantly reduce my static pressure.

    Does all of this make sense??

    Key1

  7. #72
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,913
    Is he going to increase those 11 runs to 6" and run the helper.
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  8. #73
    Join Date
    Apr 2008
    Location
    Princeton, NJ
    Posts
    581
    Quote Originally Posted by beenthere View Post
    Is he going to increase those 11 runs to 6" and run the helper.
    So it was you!!

    He is if I accept his quote....which I likely will....If what he said makes sense. I value 2nd opinions expecially from this site.

    Key1

  9. #74
    Join Date
    Jul 2006
    Location
    Southern Ca, Elkton Md
    Posts
    7,570
    Damn Been, you've been working over time on this one!
    "Correct Installation is the Key"

    .1 has killed more HX then Rush Limbaugh

    What is your TESP?

  10. #75
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    67,913
    If all the ovals are 6", then yes, run 6" round to them.
    Dampers in them of course.
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  11. #76
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    67,913
    Quote Originally Posted by weber View Post
    Damn Been, you've been working over time on this one!
    I'll be working up the invoice for it Thursday.
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    How many times must one fix something before it is fixed?

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