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  1. Replies
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    According to the formula, the equipment looses...

    According to the formula, the equipment looses 835 Btuh, per degree below 80, per 1000 CFM. But it tells me nothing about what it does to the total Btuh capacity. Moreover, when you look at the...
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    @IcanHas, What do you mean by go with ACCA...

    @IcanHas, What do you mean by go with ACCA values from the table? Do you mean TVA values as 75 degrees at 50% RH?

    My post is a round about way to find out what the capacity of a unit will be...
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    766

    So is it proprieatry just to those manufacturers...

    So is it proprieatry just to those manufacturers who post it in their product data? OR is it a universal formula that works with all conventional dx equipment?
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    Magic Formula

    Does anyone recognize this formula ?

    531461
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    Eight Tons???? It must be a HUGE house or not as...

    Eight Tons???? It must be a HUGE house or not as well insulated as you think.
  6. Replies
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    2,303

    Chilled water

    Did you use a reversible W to W unit and chilled water for cooling?
  7. Replies
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    14,442

    How about Design

    I thought design came before installation. The process should be (1) professional design (2) proper installation (3) performance verification.
    I dont see any one step being more or less important...
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    Inverter compresser

    S.T. Ranger, Inverter compressors are simply variable speed-capacity. Both York and Trane made them in the past but stopped production. The idea is to match the load by varying capacity similar to...
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    1,274

    Freezing attic

    Platchford. I agree with you. I have never seen a condensate line freeze in our attics. I have seen them freeze if the termination is exposed outside. There are some contractors who just wont install...
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    Cutting a hole

    I didn't communicate the hole idea clearly. The gas furnace has a door that covers the burners, inducer fan, gas valve etc. The door has louvers for combustion air. My idea was to cut a collar in the...
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    Mini Splits

    Churches are tough because of the disparity in people and time of use. I have always wondered if inverter mini-split heat pumps wouldn't be ideal of that application. No Carrier has their Inverter...
  12. Replies
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    genduct's got his thinkin' right

    Genduct - I like your thinking. Assume we did a blower door test. How would that information help in the decision about combustion air. If the house was super airtight, what is the remedy? If the...
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    Getting your ducts in a row

    Lurch12
    I applaud your eagerness to improve your skills. First of all, I suggest you become profficient in room by room load calculations. The industry standard is ACCA Manual J. Buy the book and...
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    2x6 walls with 1 inch XPS, 2 inches of closed...

    2x6 walls with 1 inch XPS, 2 inches of closed cell foam and 3.5 inches of cellulose, Low E windows and R50 over head.
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    Great Discussion

    Great comments,
    I was just wondering this: if we did not have codes, inspectors and licensing regulators to "protect the public" are they by and large so incompetent they could not learn to protect...
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    Hornet's Nest

    I know this will be a controversial topic. But I am curious what the consensus of subscribers is. Here goes-

    As professionals, are you convinced licensing requirements and building (mechanical...
  17. Replies
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    NC requires a room by room load on new homes and...

    NC requires a room by room load on new homes and a block or whole house load on change outs. they even specify MJ 8th edition. Of course our climate is a bit different with humidity being a bigger...
  18. Replies
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    Great Suggestions

    Thanks guys for your great suggestions
    Ira you are correct in your assumption that the cubic ft requirement is based on normal infiltration. There is even a calculation in the Carrier instructions...
  19. Replies
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    Combustion Air

    Greetings,
    I was called out today by a homeowner who wants to encapsulate his attic with foam insulation on the roof deck and gables. The problem is, there is a new Carrier gas furnace model 58PHA90...
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    Manual D is based on assumptions. If your design...

    Manual D is based on assumptions. If your design does not follow those assumptions, you must apply correction factors found in the duct tables. Elite Manual D Duct sizer calculates the corrected...
  21. i would add to RandomNick's comments - J8 AE is...

    i would add to RandomNick's comments - J8 AE is so limited in scope, it's of very little value.
  22. Replies
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    I know JimJ. Both Wrightsoft and Elite insist...

    I know JimJ. Both Wrightsoft and Elite insist their stuff can do it. I was a beta tester (unknonwingly) for wrightsoft and I guess I am just not smart enough. Of course Hank Rutkowski agrees with me....
  23. MJ8 cannot be done by hand. Save yourself some...

    MJ8 cannot be done by hand. Save yourself some grief and go for Elite RHVAC. I started years ago with pencil, J-1 worksheets and very expensive calculator. Computers changed the process and I own and...
  24. Replies
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    I own and have used both Elite and Wrightsoft for...

    I own and have used both Elite and Wrightsoft for years. Hands down Elite has the edge. They pulled ahead when MJ-8 was introduced. You only have to deal with one room at a time. Intuitive, easier to...
  25. Replies
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    Hands down - Elite RHVAC has a resident plugin...

    Hands down - Elite RHVAC has a resident plugin called Manual D Ductsizer. It's a brillant add on based on "real" pressure drops. If you try it, you will quickly find out that the longest critical...
  26. Replies
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    Condensation on windows

    Have you check the glass to see if (1) it is in fact low E (2) the coating is on the right side?
  27. Machese You are trying to solve two disctinct...

    Machese
    You are trying to solve two disctinct problems here with one cure. First of all the air noise is just a duct design problem. I have installed several Arzel's. They worked great. But they are...
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    binford The average family of 4 can generate...

    binford
    The average family of 4 can generate 16-24 lbs of water per day by their activities. Do you not mop floors, wash and dry clothes, cook, bathe, wash dishes and breathe. Then there is building...
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    P student Remember law 1. One cfm in equals 1...

    P student
    Remember law 1. One cfm in equals 1 cfm out. When ventilation air eclipses ach natural, the ventilation rate dominates the moisture load. They are not cumlative.
  30. Replies
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    Teddybear is right on. Humidity is the key. Not...

    Teddybear is right on. Humidity is the key. Not only does it provide the ideal climate for microbial growth, it also increases the offgassing of VOC's. Some estimates I have read say for every 10%...
  31. Replies
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    dash Contare'. Some species of mold product...

    dash
    Contare'. Some species of mold product VOC's.
  32. Replies
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    RG Might I suggest a different vein to your...

    RG
    Might I suggest a different vein to your mission. It would seem to me you would need a definitive measure of particulates in the air as opposed to a subjective feeling. I have been playing with...
  33. You asked: "Are the EWC autoflo humidifiers worth...

    You asked: "Are the EWC autoflo humidifiers worth the cost?"

    I thought you might percieve the answer as yes from within the statement that tearing out an Aprilaire and eating the cost because it...
  34. First of all how do you know you need a...

    First of all how do you know you need a humdifier? Have you tracked the humidity level in your home? If a reasonably sized home has a low humidity problem in the winter, it is prime facie evidence of...
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