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  1. Replies
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    Picture this. If you took a plastic bag,say a...

    Picture this. If you took a plastic bag,say a kitchen trash bag. If you put it in a 12 inch round duct and then fill the bag with just enough air that the bag fills the duct. Now push the bag through...
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    Best prices to start and a discount. Thanks!!

    Best prices to start and a discount. Thanks!!
  3. Replies
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    Wow. you need to start learning your trade. ...

    Wow. you need to start learning your trade.

    you could start here

    https://www.youtube.com/watch?v=ybwiG-OcKoQ#t=16
  4. Replies
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    What was your measured air flow?

    What was your measured air flow?
  5. As per kdean1. Did he measure air flow? No...

    As per kdean1.
    Did he measure air flow? No reason to add refrigerant if he didnt measure air flow
  6. what is it? 3000 CFM of combustion air,1400 degree stack temp

    What is it ?

    3000 CFM of combustion air
    1400 degree stack temp
    44 Amp igniter
    stoichio metric 1.7:1 air/fuel mixture


    I thought this was fascinating.
  7. Thread: Geothermal

    by tlj000
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    327

    Your question is extremley vague. To size a...

    Your question is extremley vague. To size a system correctly someone would need location, orientation, construction details, glazing details among other things.
    Although some people in my area say ...
  8. Replies
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    1,246

    Ask for a copy of the load calcs and compare the...

    Ask for a copy of the load calcs and compare the entries. All of the house details you stated should match
  9. Replies
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    954

    35 feet of 4 inch flex duct installed by an...

    35 feet of 4 inch flex duct installed by an electrician. I suspect a fan that makes noise but doesn't move air
  10. Replies
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    2,301

    Take a look at the attached bid comparison sheet

    Take a look at the attached bid comparison sheet
  11. Replies
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    2,301

    Keep in mind duct work and the amout of air...

    Keep in mind duct work and the amout of air flowing through it plays a large roll in capacity. Just because the name plate on your current system says its 3 ton, doesn't mean its delivering 3 tons....
  12. That makes alot of sense. Is there any...

    That makes alot of sense. Is there any documentation that you know of on this. I know a guy who likes to use shared returns, it just doesn't seem right to me. He argues that it fine.
  13. Replies
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    3,137

    He is a real believer in "Sometimes you have to...

    He is a real believer in "Sometimes you have to make do with what you have"
  14. Replies
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    3,995

    The space between the bottom of the AH and the...

    The space between the bottom of the AH and the return is used for noise control and humidification
  15. Replies
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    As others have said, forget about any equipment...

    As others have said, forget about any equipment changes or upgades until you have your building enclosure and duct work in order.
    Don't let geothermal even cross you mind again. At this point that...
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    263

    Yea the Chinese manufacturers had a huge number...

    Yea the Chinese manufacturers had a huge number of booths.
    Who knew there were 25 - 30 different brands of ductless splits. (At least brand names, who knows who makes them)
  17. Replies
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    1,690

    Jack Rise does a better job explaining than I...

    Jack Rise does a better job explaining than I can. Read this from an earlier post.

    http://acinewyork.org/sites/default/files/session/82728/ny12hvac2risejack.pdf
  18. Replies
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    1,690

    When you calculate your friction rate and the...

    When you calculate your friction rate and the result is something other than .1. You will need those other numbers.
  19. Replies
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    1,690

    [/COLOR] No your not using the ductulator...

    [/COLOR]

    No your not using the ductulator right. You can't pick a random friction rate. you need to calculate it based on the total equivalent length of your run.
    The duculator does not know if...
  20. Replies
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    1,690

    Download this pdf file ...

    Download this pdf file

    http://acinewyork.org/sites/default/files/session/82728/ny12hvac2risejack.pdf
  21. Replies
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    1,690

    I don't believe you will find an option for .10...

    I don't believe you will find an option for .10 static pressure on your ductulator. what your likely looking at is friction rate.
    Friction rate is calculated not picked, based on the total...
  22. Replies
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    1,263

    Agreed. Forget about how to heat and cool. Until...

    Agreed. Forget about how to heat and cool. Until you know how much you need to heat and cool.
  23. "air conditioning isn't necessary" If you don't...

    "air conditioning isn't necessary"
    If you don't need AC why go with forced hot air, are the electric rates in your area really cheap?

    I'd go for a Hydronic system and lots of insulation.
  24. Example of why its not a good idea. A piece of...

    Example of why its not a good idea.
    A piece of copper pipe at room temp.
    I cleaned the top part of the pipe and left the bottom as I found it.

    Which temperature would you pick?

    398831
    398821
  25. Thread: Hvac buddy

    by tlj000
    Replies
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    1,029

    I can tell you for sure there is not an entry...

    I can tell you for sure there is not an entry labeled "beer can cold" or air flow measurement based how they feel to the hand.

    So that might throw some people off. :grin2:
  26. Replies
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    4,626

    ACCA is trying to establish a Quality assurance...

    ACCA is trying to establish a Quality assurance program. As it looks there aren't to many contractors that feel the customers are willing to pay for quality assurance. The majority of customers look...
  27. Thread: Inspection???

    by tlj000
    Replies
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    2,816

    It's clean and shiny

    It's clean and shiny
  28. Thread: Microfarads

    by tlj000
    Replies
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    1,095

    http://www.packardonline.com/cap_training/player.h...

    http://www.packardonline.com/cap_training/player.html

    This is a good video on caps
  29. Replies
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    Is your home part of a large development built by...

    Is your home part of a large development built by a large scale production builder?
    It's sad but some builders go with the low bid contractors and when nobody inspects the work and holds them...
  30. Replies
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    Today may be a reasonable day in North East in PA...

    Today may be a reasonable day in North East in PA (high 80s low 90s) to evaluate how well your current system is working.

    Is every room comfortable,
    is the temperature even though out the house....
  31. Replies
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    Depending on the permit date of your home it...

    Depending on the permit date of your home it would have been built to the 2007 or 2010 Florida energy conservation code

    Chapter 4 section 403.5 states the code requirement for ventilation.
    ...
  32. Replies
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    drt125 would you mind contacting me. I have an...

    drt125

    would you mind contacting me. I have an opinion that I prefer not to voice on the open forum.
    My email is in my profile.

    Thanks
  33. Replies
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    3210 CFM50 means almost nothing without first...

    3210 CFM50 means almost nothing without first knowing the size of the house.

    Example- if you live in a 1200 sqft ranch with 8 foot ceilings. 3210 CFM50 would indicate that the air in your home...
  34. Thread: Leak detectors.

    by tlj000
    Replies
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    3,079

    From what I understand some of the less expensive...

    From what I understand some of the less expensive or older units. Have sensors that degrade over time and have to be replaced. If you use it on a regular basis and replace the sensor at set intervals...
  35. Replies
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    EnergyStar Homes are suppose to have mechanical...

    EnergyStar Homes are suppose to have mechanical ventilation based on ASHRAE 62.2. Your home should have approximately 70 CFM of outside air delivered 24 hours a day.

    The type, size and quantity...
  36. Replies
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    Iím missing something here. Let just say the...

    Iím missing something here.

    Let just say the burner is 100% efficient.
    If the load requires 1gph running 24 hrs. that would be 3,336,000BTU/24hrs
    Your examples of nozzle and run times and...
  37. Replies
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    Nice work. But I must say I hate to see all that...

    Nice work.
    But I must say I hate to see all that exposed copper mounted on un insulated masonry. (unless its insulated on the outside)

    95% system mounted on a giant heatsink = ?%.
  38. Replies
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    Care to expand on this? If you have proper...

    Care to expand on this?
    If you have proper combustion and less heat going up the chimney how could you use more oil.
  39. Manual J design temp for central VA. should be...

    Manual J design temp for central VA. should be 17-19 for heating and 90 for cooling.
    You can tell on the manual J report that the design temps were changed by the fact that the font is in bold type....
  40. Replies
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    7,111

    Maybe he should take up video editing. That phone...

    Maybe he should take up video editing. That phone call was fascinating.
  41. Freon and Leaded Gasoline, Same guy. And why Unions have their place.

    This excerpt comes from an interesting book entitled The Poisonerís Handbook by Deborah Blum. It is basically a real-life series of detective stories centering round the first forensic unit in New...
  42. Replies
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    Also remember. Depending on you sensible heat...

    Also remember. Depending on you sensible heat ratio

    According to ACCA manual S. Excess latent capacity can be used towards sensible load.
  43. Replies
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    1,549

    some manufacturer spec sheets will give you cfm...

    some manufacturer spec sheets will give you cfm values based on static pressue
  44. Replies
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    1,914

    on the bottom, what is that 1/2 inch copper pipe...

    on the bottom, what is that 1/2 inch copper pipe with the globe valve going to?
  45. Rheem ROCB-072-M Documentation ? Oil two-stage burner with a 50 percent turndown

    Just read about this at ACHR News

    "Rheem recently launched its
    ROCB line of oil furnaces, which
    features a two-stage burner with a 50
    percent turndown ratio,"

    Anybody have any...
  46. Replies
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    1,003

    I'm just saying be careful with making changes or...

    I'm just saying be careful with making changes or custom values unless your sure it does not affect the manual J standards
  47. Replies
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    1,003

    Just R values and building infiltration in...

    Just R values and building infiltration in Wrightsoft. There are options for foam board and continuous insulation.
    If needed to, you can make any custom value you want. But if you want to claim you...
  48. Replies
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    I would say yes its stable

    I would say yes its stable
  49. Replies
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    View Post

  50. Replies
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    Happy with mine. works well with a pitot tube for...

    Happy with mine. works well with a pitot tube for traversing ducts.
    It will save up to 99 samples and then average them for you.
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