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  1. Replies
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    I played a joke at United Refer when I collected...

    I played a joke at United Refer when I collected all the stuff in the box I didn't use and said I was returning for credit.
    What!!! they asked.
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    The word "static" means still or not moving....

    The word "static" means still or not moving. There are two pressures in a duct with a fan running. Static pressure and velocity pressure. Static pressure pressurizes the duct and velocity pressure...
  3. Thread: Motor Amps

    by hvacker
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    I remember in school Ohms law was fun. Then we...

    I remember in school Ohms law was fun. Then we had to deal with AC. Whole other deal if actual numbers are needed.
    Kinda fun though. Henrys, reactance, impedance and all.
  4. Have any of the failures been on systems larger...

    Have any of the failures been on systems larger than 2 1/2 or 3 ton? The only service bulletins I could find have been on smaller coils.
    The reason I asked is a contractor I sometimes sub for in...
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    ?? What copper alloys have you been able to braze...

    ?? What copper alloys have you been able to braze w/o a flux?????? No, and I'll bet a shiny new dime your wrong. But understand what I said. Phosphorus adds an additive to the mix. It reacts with...
  6. Ya it ain't for everyone. I did it for years and...

    Ya it ain't for everyone. I did it for years and one day I quit and got employed with an Intel build up in my back yard, literary, I could see it from my back yard. Not everyone is cut out for...
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    Phos stands for phosphorous and is an oxygen...

    Phos stands for phosphorous and is an oxygen reactant creating copper phosphorus. Not a true flux as it won't help you with anything except copper to copper.
    I've known guys that use flux coated...
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    Looks like a lubricant problem. The first threads...

    Looks like a lubricant problem. The first threads look ok but fail in the middle. Like said use only thread cutting oil generously. Adjust the die so a fitting can be screwed on the pipe three...
  9. A lot of Unions locals are new to the idea of...

    A lot of Unions locals are new to the idea of doing service. Often don't understand how to go about getting contractors interested and contractors often don't understand service either. Many locals...
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    I did the controls, if I remember about 40 units...

    I did the controls, if I remember about 40 units on a prison some years ago. They were huge and I could stand up inside the blower compartment. They were built like a tank and were very expensive....
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    Reminds me of American Pickers...

    Reminds me of American Pickers...
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    459

    For a certified T&B you need all kinds of stuff....

    For a certified T&B you need all kinds of stuff. Duct traverse, I use a inclined manometer. Never lies. Then a tach, amprobe to calculate brake hp. TESP measurments, a flow hood at most terminals and...
  13. Some years ago I replaced 48 Sauermann pumps with...

    Some years ago I replaced 48 Sauermann pumps with Aspen but not because they ware not pumping but because of the noise. They all were in a hotel and were waking guests.
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    I duplicated Manual N in a spread sheet. I hate...

    I duplicated Manual N in a spread sheet. I hate to look at my handwriting. The load prints on both sides of legal size papers.
  15. I've had good luck with Nutro. It's a tad pricy...

    I've had good luck with Nutro. It's a tad pricy but seems to be good. A store here gives a free bag when I've bought 12.
    The best thing to do is read the label. If the ingredient list "cellulose"...
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    Try the controls forum.

    Try the controls forum.
  17. Replies
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    Not sure I understand. Did you have two locked...

    Not sure I understand. Did you have two locked rotors on the same equipment.
    Locked rotor is usually a mechanical failure so why are you looking for flooding? When it manages to run is the...
  18. Replies
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    Maybe that cold air falls and warm air rises in a...

    Maybe that cold air falls and warm air rises in a space that doesn't mix. BB we know you don't work with T&B. But understand a lower speed is probably no benefit. Supplies, it's all about the mix. I...
  19. Replies
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    Go get a dog as a puppy and raise it as his own.

    Go get a dog as a puppy and raise it as his own.
  20. Replies
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    Ya, could be the result of posting while drinking.

    Ya, could be the result of posting while drinking.
  21. A good start would be to take classes in...

    A good start would be to take classes in electronics. Much of DDC systems will require a knowledge of this subject.
    With mechanical controls you can usually see them work but not so much with...
  22. Replies
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    I haven't worked resi in many years but when I...

    I haven't worked resi in many years but when I did I paid attention to body language to see how comfortable they were or not. For some, especially women can be cautious about having a strange man in...
  23. Replies
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    Different designs of supply grills/diffusers have...

    Different designs of supply grills/diffusers have different free areas (K factor) so yes the amount of delivered could change.

    Also the closer to the ceiling a supply is the less mixing will...
  24. Replies
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    This is fun. It's like doing a T&B w/o...

    This is fun. It's like doing a T&B w/o instruments. Why don't we do this and that and see what happens.
    I can guess. BB put in a return. the system worked better. WHY? Well maybe his system was...
  25. Replies
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    I'm not so sure. This is no time to quit. What...

    I'm not so sure. This is no time to quit. What needs to be done here is actual measurements. I have solved problems with both supplies and returns. The solutions were in measurements to determine the...
  26. Replies
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    Original OP ? Shouldn't this question be asked...

    Original OP ? Shouldn't this question be asked before you buy.
  27. Replies
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    1,925

    I like OEM mostly so I don't have to re-pipe. EZ...

    I like OEM mostly so I don't have to re-pipe. EZ in EZ out.

    Good story PHM Many owners loose sleep about hiring new techs and turning over hard earned customers to them.
    In this incarnation I...
  28. Replies
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    What I remember from past applications is when...

    What I remember from past applications is when used on a sleeve bearing motor the bearings would fail. My understanding was the sleeve bearing requires heat to cause the oil to lube the bearing by...
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    How many of the places you shop feed you? I'd...

    How many of the places you shop feed you?
    I'd rather have lower prices.
  30. Thread: Mannual N vs J

    by hvacker
    Replies
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    Rules of thumb are most useful to let you know...

    Rules of thumb are most useful to let you know you might have missed something but I wouldn't bet a job on them. Especially commercial where things are missed routinely.
  31. Replies
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    You might want to contact York tech support for...

    You might want to contact York tech support for procedures. It's hard to say from here what I or someone else might do.
    Sounds like Ouch!
  32. Replies
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    If the OP is talking about the indoor uni, 150...

    If the OP is talking about the indoor uni, 150 cfm would be an ice maker. Anyone for Jack on the rocks?
  33. Replies
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    There is a possible BB might have improved supply...

    There is a possible BB might have improved supply performance. That's if his system was short or return. Then by adding the one he could have increased his overall supply cfm.

    On the other issue...
  34. Thread: Huge annoyance

    by hvacker
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    All my career I wished I'd learned how to pick...

    All my career I wished I'd learned how to pick locks. Too many times waiting for someone to show with a key.
    I finally did get information on how to pick simple tumbler locks and it looks...
  35. Replies
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    Check out the performance of transfer grills...

    Check out the performance of transfer grills here.

    http://www.ba-pirc.org/casestud/return_air/index.htm
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    I might take a back door first and find out from...

    I might take a back door first and find out from maintenance if the system is glycol protected. Personally I wouldn't want most any system not protected because excrement occurs, but if it is your...
  37. Replies
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    Your trying to fix a poor design with a return....

    Your trying to fix a poor design with a return. Velocity is king. A space is warm then blast it with cold air. The supply grills are designed to entrain the warmer air and mix it. If the design is a...
  38. Replies
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    I worked the Chicago for many years. Most homes...

    I worked the Chicago for many years. Most homes have basements that makes running returns a lot easier. A problem was many homes duct work were sized for heating as AC was in the future. The smaller...
  39. Replies
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    BB a return is nothing but a pressure relief...

    BB a return is nothing but a pressure relief device. It doesn't suck a thing out of a space. I know this might be counterintuitave but this is what modern instruments have shown us.
    I wish I had...
  40. Replies
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    What goes in must come out. Simple ok. On the...

    What goes in must come out. Simple ok. On the other hand there is a necessity to consider the supply grill, Any visit to the manufactures and their designs will conclude this. Forget about houses for...
  41. Replies
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    One considerations in a T&B report was the need...

    One considerations in a T&B report was the need to include that the data might not be repeatable in the field due to various things that change like temperature and humidity but mostly when filters...
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    Varistor. Suppresses transients. ...

    Varistor. Suppresses transients.

    https://en.wikipedia.org/wiki/Varistor
  43. Replies
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    You might have better luck re-posting in the...

    You might have better luck re-posting in the Controls forum.
  44. Thread: Mannual N vs J

    by hvacker
    Replies
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    378

    Motors in the air stream, coffee makers, printers.

    Motors in the air stream, coffee makers, printers.
  45. Replies
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    The quantity does in fact stay proportional if...

    The quantity does in fact stay proportional if the CFM changes.
    A quote from The TAB balancing text book:

    "The basic principle of proportional balancing is that, once set, the quantity of...
  46. Replies
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    Sure when the system is visible. In an existing...

    Sure when the system is visible. In an existing structure, especially in houses, knowing what's behind the walls is not always possible. You might not know the longest run or much else. Then the SWAG...
  47. Thread: Mannual N vs J

    by hvacker
    Replies
    10
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    378

    :gah:Manual N takes a lot longer. Probably all...

    :gah:Manual N takes a lot longer. Probably all day long.
  48. Replies
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    Maybe. I don't know what kind of motor they use....

    Maybe. I don't know what kind of motor they use.
    At Bonneville I saw a land speed contender built by an Ohio university that used oxygen and hydrogen to somehow power a rectifier to power 4 motors...
  49. Replies
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    For your reading pleasure I found this. It's a...

    For your reading pleasure I found this. It's a tad lengthy but if you scroll down to the blue and grey they show the different methods of returning air and their effectiveness.
    ...
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    :grin2:

    :grin2:
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