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Type: Posts; User: Rubicon

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  1. Replies
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    I agree... In this particular case I'm almost...

    I agree... In this particular case I'm almost sure it's the duct design but that's another story. I was just concerned that he dismissed flowing N2 so easily as a contributor.
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    Flowing N2 during brazing not important?

    I have a Lennox 13ACD with a Copeland Scroll in it that died at the 4 year mark and Lennox is being good about replacing the unit under warranty. The problem is this is not an isolated case, I've...
  3. best way to manage static pressure on a 3 zone system?

    I'm looking at a design for a 3 story home with a zoned system and was curious to know opinions from the pros on the best way to manage the static pressure at the handler when only one of the three...
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    Excellent idea... I'll do that. I didn't think...

    Excellent idea... I'll do that.

    I didn't think my post count was up to the task yet. I've been lurking for some time, I just don't post much.
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    No supply air sensor...even though they installed...

    No supply air sensor...even though they installed a motorized damper.

    What would be the average length for a bypass circuit. I've got the duct diameter sizing guidelines from Jackson Systems but...
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    Barometric Bypass questions...

    I'm working on a 2 story zoned system and the customer was complaining about the heat not being equal in the two zones. (upstairs/downstairs) Eventually the heat quit all together. The tech was...
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    FAU, coil, and plenum are supported by blocks...

    FAU, coil, and plenum are supported by blocks resting in the condensate pan. Some of the contractors just use galvanized gutter flipped over for the supports. These are all horizontal in the attic...
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    ...and how many rolls of mesh tape would be...

    ...and how many rolls of mesh tape would be sufficient to go with that :D
  9. Replies
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    I know all about this... my own personal trip...

    I know all about this... my own personal trip to the local Med 7 is a testament to this fact. :D
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    In addition to the NAIMA guide I referenced...

    In addition to the NAIMA guide I referenced earlier there are many other companies that specify fasteners ranging from staples to screws for duct board fabrication. As an example the Johns Manville...
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    All of the HVAC contractors I work with out here...

    All of the HVAC contractors I work with out here in CA install radial systems using duct board plenums and flex duct. most of them just size the plenum to the cabinet, (nowhere near the tolerances...
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    attaching plenum to coil, who uses fasteners?

    I'm just curious to know what the "official" word is on using mechanical fasteners to attach the plenum to the coil casing. I'm seeing a few installs where the techs are just using a foil mastic and...
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    ... not even close. They violated just about...

    ... not even close. They violated just about every guideline from the ADC and SMACNA regarding the install of flex ducts. I know this will end up being the bulk of the friction loss in the system,...
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    Tees, Wyes, or DB's?

    I'm working with a radial system that is 100% flex, I'm curious to know which connection will provide the best flow downstream from the plenum.

    Wyes
    Tees
    Distribution Boxes


    I've heard...
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