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  1. Oh Shit it bit me! Moderators forgive me, please...

    Oh Shit it bit me! Moderators forgive me, please as it's not my fault.

    I always liked D's back in the day Dan, didn't have a problem finding them when granted consent...they were humongous. On the...
  2. Thanks Dan! OMG...The carefully fabricated...

    Thanks Dan!

    OMG...The carefully fabricated Snark Containment Box DW gifted me at our 1971 wedding as Engineers' wives do, and which we've carefully maintained for decades since, and hoped to...
  3. Good to be concerned, as we all are: With all due...

    Good to be concerned, as we all are: With all due respect, please think about whether it's best to conserve energy by proper design/installation, OR TO WASTE ENERGY EFFICIENTLY per the guys from the...
  4. I work with a couple of local builders, and one...

    I work with a couple of local builders, and one called me a few years ago. It was time for him to replace equipment and upgrade his ducts, he'd received bids from two HVAC contractors who do his work...
  5. RM: Truth be told you need one of the other...

    RM: Truth be told you need one of the other people to handle this, as you've identified an area in which I truly don't know everything.
  6. Love it! You're deciding whether you need 550...

    Love it!

    You're deciding whether you need 550 SF/Ton or 367, as compared to new homes at 1,000 to 1,350+. Do request both Manual J calculations, post them and we'll all have some fun. Offer to pay...
  7. The IOM chart on page 23 looks like your choices...

    The IOM chart on page 23 looks like your choices on the "21" are 2-1/2 and 3 tons, settings 3 & 5 respectfully. Someone else will have to comment on what 1, 2 & 4 do, if anything. I didn't save the...
  8. You are so like me: Beating a Dead Horse Until...

    You are so like me: Beating a Dead Horse Until It's mush; my daughter talks about chalk and blackboards.

    Forget about two stage, you don't need it. If you absolutely must have it, buy two two's...
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    Thanks HM, I'll do it.

    Thanks HM, I'll do it.
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    NCI TAB/Duct Analysis Training

    Has anyone taken their 2 or 3 day courses? I need some CEU's to extend my license through June 2022.

    Thanks!
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    Lifetime Job Security with Great Income

    Ferd's Formula:
    1. Start with several years' hands on service and repair to gain an understanding of the opportunity the guys from the Apha Hotel are creating and learn about servicing the high tech...
  12. CD: You have the potential for a great income and...

    CD: You have the potential for a great income and lifetime job security and the Industry needs Good People who care!

    Check threads on TAB, etc.
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    CAUTION: Do not shoot that thing at fibrous glass...

    CAUTION: Do not shoot that thing at fibrous glass ductwork, the EPA will be all over you.

    There's gotta be someone in a US office somewhere who can hook you with another country's government who...
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    Thanks for helping CC! ...

    Thanks for helping CC!
    ...
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    MG: The Industry is experiencing an exponential...

    MG: The Industry is experiencing an exponential increase in service and repair business created by the high tech stuff installed by guys from the Alpha Hotel, but most contractors (sorry, people)...
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    SP Measurement

    I bought the analog Alnor 6000 kit in 83, had a lot of confidence in their "Suction Cup" attachment.

    When I left the instrument on a job a few years ago and it disappeared, I bought the digital...
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    The 10 CFM rooms are water closets in large...

    The 10 CFM rooms are water closets in large bathrooms (a room housing the WC, not the fixture inself) large walkin closets, mud rooms, powder rooms, pantries, etc. all with a little exposure to...
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    This is getting scary, W: I'll be 77 in June! ...

    This is getting scary, W: I'll be 77 in June!

    I love attics and crawl spaces, but I don't get around much anymore. I'm thinking the 4 stone I've added since 83 might be part of the reason.
  19. Rule of Thumb: "NEVER GO BIGGER".

    Rule of Thumb: "NEVER GO BIGGER".
  20. Like I said, need to do other stuff today, I'm...

    Like I said, need to do other stuff today, I'm rushing! Your existing number is 419 SF/Ton and the people at the Alpha Hotel are trying to up you to 341. You only need about half the existing...
  21. No one is permitted to select equipment based on...

    No one is permitted to select equipment based on SF/Ton, but it's a great BS meter when you do the math: 3,800 SF/7 Tons = 543 SF/Ton.

    Today's range is 1,000 to 1,350+. Yes I know your home was...
  22. RM: Top of 23 tells the installer 360 to 450...

    RM:

    Top of 23 tells the installer 360 to 450 CFM/Ton, 720 to 900 CFM.

    Code Violations: System doesn't meet Manufacturer's Installation Instructions (2015 IMC 304.1) and doesn't deliver required...
  23. Joey's right: Your contractor has provided an air...

    Joey's right: Your contractor has provided an air handler good for 2-1/2 and 3 tons. It's delivering 1,000 CFM give or take with Setting 3, 5 gets you 1,250 CFM or so; see page 23. Also of interest...
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    Lot of construction workers are paid piecemeal,...

    Lot of construction workers are paid piecemeal, not hourly. Using the HVAC outlets as urinals is a lot quicker than walking to the porta-potty. And I've found a "D Box" that was used as a toilet...
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    Have you checked for construction debris in the...

    Have you checked for construction debris in the ducts? Hire a pro to remove a floor diffuser and check the metal "Boot" fitting, he'll be able to do that without cutting himself on protruding screws....
  26. Another thing: If your gas and water meters are...

    Another thing: If your gas and water meters are accessible, check them yourself; why wait a month?
  27. Lowering boiler temperature reduces energy...

    Lowering boiler temperature reduces energy consumption, so that's not it.

    When you said "leak", I was thinking "water leak" (boiler water going to "Mother Nature"), a very real possibility. You...
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    With today's homes running as much as 1,350+...

    With today's homes running as much as 1,350+ SF/Ton, a lot of sizing issues have arisen: Manufacturers just don't make small enough stuff.

    I wrestled with how to deliver only 12 CFM to an outlet...
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    LOL! That's my last resort when all else fails:...

    LOL! That's my last resort when all else fails: The additional 0.03" can make a big difference.
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    Thank you 3298! Alpha = A and Hotel = H in...

    Thank you 3298! Alpha = A and Hotel = H in military speak, so we're of a mind there. I'll have been in the Construction Industry for 61 years as of June 12, and can relate: I've been (insert a word...
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    I have a friend who inserts round ceiling...

    I have a friend who inserts round ceiling diffuser dampers in floor diffuser boots where there're no (accessible) branch dampers, says they work fine. I believe that complies with the SMACNA...
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    I'm thinking Wayne sleeps well at night. You...

    I'm thinking Wayne sleeps well at night.

    You think the TAB/ Consulting Engineer relationship is tough, try depending on a bunch of slow-paying Architects who "Live in the Alpha Hotel" for your...
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    One of my Mentors was an Engineer for a big sheet...

    One of my Mentors was an Engineer for a big sheet metal contractor in Philadelphia. I'd spec'd a school balancing job back before I had a clue and questioned some of the reported results. He reviewed...
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    And it's a field where you have job security...

    And it's a field where you have job security forever: Your workload increases every hour of every day because of people who are undertrained and/or lazy and/or larcenous and/or living better through...
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    I'd be quite surprised if the fibrous plenum...

    I'd be quite surprised if the fibrous plenum isn't prohibited by Code, Manufacturer's instructions and/or codes referenced therein: It is "combustible" by definition.
  36. Supply at the coil is often lower than the outlet...

    Supply at the coil is often lower than the outlet - business opportunity there (insulation). Same is true on the return (insulation and tape/mastic). Grewat troubleshooting technique. Bring drywall...
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    Love it! Wayne: Buying and using hood,...

    Love it!

    Wayne: Buying and using hood, velometer and manometer is how I started in 1983 and you are right on!
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    When a system is designed there's typically an...

    When a system is designed there's typically an ACCA, SMACNA and/or Code requirement for branch dampers. Balancing at the outlet is usually prohibited because of the noise issues and the fact that...
  39. I have one, school's out. SDMN5 for SP should...

    I have one, school's out.

    SDMN5 for SP should be in everyone's tool bag/box. Love it!
  40. The coil PD is way low for 100 MBH - I'm guessing...

    The coil PD is way low for 100 MBH - I'm guessing you have 4 or 5 tons in Louisiana - a home there can't require that much heat. Wet coil should be 4 to 6 times that. Your external to the furnace PD...
  41. Thread: Energy costs

    by ferd1942
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    Her heating is as good as it gets: Heat at the...

    Her heating is as good as it gets: Heat at the perimeter and no moving air and no drafts once she closes windows and doors. Cooling only in the attic works and doesn't freeze.

    As stated, the new...
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    $100/hour in NYC - would he be able to afford a...

    $100/hour in NYC - would he be able to afford a coffee there?
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    Airflow, airflow, airflow!!!

    Airflow, airflow, airflow!!!
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    The Code-required ventilation is (2015 IMC Table...

    The Code-required ventilation is (2015 IMC Table 403.3.1.1) 0.06 CFM/SF, and you should compare with 4 to 6 ACH and use the larger. If there are toxic substances the requirement will be considerably...
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    Crawl spaces must be sealed and dehumidified to...

    Crawl spaces must be sealed and dehumidified to control ambient T/H. Homes must be reasonably well airsealed (a Blower Door Test will ID openings you can't see). System airflow must be within...
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    Sadly, there's a huge need for qualified people...

    Sadly, there's a huge need for qualified people to analyze and fix improper HVAC installations.

    Bypass the college degree, and improve on your "Hands On" background instead. Take any ACCA course...
  47. Does a pheasant strained through the grille and...

    Does a pheasant strained through the grille and radiator of a new 66 Corvette at 100 MPH count?
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    As a "Professional Test Taker" I can say there's...

    As a "Professional Test Taker" I can say there's much good advice here: Prepare, rest up, read the whole test, etc. I'd add do some mild exercise (I quick walk about a quarter mile - don't take the...
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    "Over-sized return air is a myth": Agreed MG! ...

    "Over-sized return air is a myth": Agreed MG!

    When we added cooling coils to the 0.10" FRICTION design in the 50's and 60's there began what I call a "War" between us (as I was then) contractors...
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    You might also check the manufacturer's...

    You might also check the manufacturer's performance charts for how much dehumidification occurs at 500+ CFM/ton on that system, if it is 4 tons.

    And do check Appendix 3 for the EL's ("Equivalent...
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