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Type: Posts; User: yankee fan

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  1. Replies
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    When dealing with unitary applications like homes...

    When dealing with unitary applications like homes & small offices, 325-400 cfms per ton is recommended. Applied applications like churches, hospitals & spinning rooms, with special make up air...
  2. typically, bedroom returns should be slightly...

    typically, bedroom returns should be slightly bigger or slightly smaller than the supply that feeds the room. I do not condider the bedroom a good choice for a high volume return. Pantries typically...
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    Supply air temp 41 degrees--can't be right....

    Supply air temp 41 degrees--can't be right. Durning operation check your . It will show you your coil/refrigerant temperature. At such a low temp your systems cop is down.
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    Daikin units would be my choice, But only if you...

    Daikin units would be my choice, But only if you insulate with closed cell spray foam--you get a true R value and air sealing. I would keep the net heating requirement as low as possible. Manual J is...
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    Looks like 1.5 tons. The 380N is probably a 38EN.

    Looks like 1.5 tons. The 380N is probably a 38EN.
  6. I use Nortec steam humidifiers. They are more...

    I use Nortec steam humidifiers. They are more expensive but require less maintenance. Unlike Aprilaire, they operate independent of the heating cycle which is very important. If you have hydronic...
  7. Not when you replace a furnace and expect to take...

    Not when you replace a furnace and expect to take advantage of the fed tax credit or have more than one zone.
  8. In N.J., air sealing the typical basement and...

    In N.J., air sealing the typical basement and attic of a 2000 sq ft home will cost between $2000. to $2400. dollars. Adding 6 inches of cellulose insulation in the attic will cost between $900 &...
  9. The Building Performance Institute has a great...

    The Building Performance Institute has a great program and is nationally recognized. If your state has a home performance program you will likely get subsidized training and tooling if you go through...
  10. Air sealing a home is a great option. I do a lot...

    Air sealing a home is a great option. I do a lot of home energy auditing/weatherizing and so far have encountered only 2 homes that required air exchangers after the air sealing was completed. It is...
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    Some of the best fly fishing is in salt water....

    Some of the best fly fishing is in salt water. From October thru December striped bass migrate down the New Jersey Coast (don't laugh) and the action can be incredible. I have seen a lot of guys...
  12. The International Mechanical Energy Code requires...

    The International Mechanical Energy Code requires duct systems to be sealed. I would get the installer back and have him seal all joints, not just the connections you mentioned. It's well worth the...
  13. [QUOTE=RoBoTeq;4428552] One of the biggest...

    One of the biggest causes of compressor failure is poor airflow. The industry has recognized for a long time that most duct systems are improperly designed and installed, and that vs motors can cover...
  14. [QUOTE=RoBoTeq;4427672]Then why do coils freeze...

    [QUOTE=RoBoTeq;4427672]Then why do coils freeze up on systems with no problems with the refrigeration circuit?

    Do you also believe that the only reason to sell a vs motor is to make more money? ...
  15. [QUOTE=RoBoTeq;4427172]What? Are you claiming...

    [QUOTE=RoBoTeq;4427172]What? Are you claiming that a vs motor does not continuously produce the amount of air that it is set for? Are you claiming that a vs motor changes its cfm rating depending on...
  16. Units like Carrier's two speed model with...

    Units like Carrier's two speed model with thermidistat are designed to dehumidify, however, they can, by design, overcool up to 3 degrees. The bigger point being, an air conditioner system is not a...
  17. In theory your correct. The vs motor will ramp up...

    In theory your correct. The vs motor will ramp up as the coil gets wet. However, when you design a system, the duct design and fan cfm are based on a wet coil, not a dry coil. Therefore, when running...
  18. In theory your correct. The vs motor will ramp up...

    In theory your correct. The vs motor will ramp up as the coil gets wet. However, when you design a system, the duct design and fan cfm are based on a wet coil, not a dry coil. Therefore, when running...
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    fixed orifice metering devices use the superheat...

    fixed orifice metering devices use the superheat method for charging. superheat varies with the outdoor temperature, therefore, the temperature controls the superheat not the fixed orifice. there are...
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    arzel dampers are an excellent choice. they do...

    arzel dampers are an excellent choice. they do cost more but not a whole lot more. have arzel recommend a qualified contractor in your area.

    regardless which zoning system you use, if your system...
  21. downsizing your equipment is probably good...

    downsizing your equipment is probably good advice. however, you need a properly designed and installed duct system to "match" your properly sized hvac equipment. without both, efficiency and comfort...
  22. downsizing your equipment is probably good...

    downsizing your equipment is probably good advice. however, you need a properly designed and installed duct system to "match" your properly sized hvac equipment. without both, efficiency and comfort...
  23. manual j calcs are required to determine each the...

    manual j calcs are required to determine each the rooms design cfms. transfer grills will work, however, hi/lo returns are a far better choice. but there's a rub. when you close the doors you create...
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    if the bubble wrap is "sealed" so that no air can...

    if the bubble wrap is "sealed" so that no air can get between the two layers of insulation your approach should be fine.
  25. Thread: HVAC Calc

    by yankee fan
    Replies
    4
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    418

    room by room calcs are always the best. it gives...

    room by room calcs are always the best. it gives yor the basis for future balancing. 2nd floor foyer areas should be served by a 2nd floor thermostats. 8th editon manual j calcs cover every type load...
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