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  1. Replies
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    How things change. I once read the account of the...

    How things change. I once read the account of the first virus "The Worm" in the 80's. For awhile viruses entered through the Boot. Simple. Then through attachments. Actually better. I'm referring to...
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    Whatever is causing the burners not to draft. You...

    Whatever is causing the burners not to draft. You said you cleaned the HX so that should be ok. A buildup inside the HX piping can prevent draft by not transferring the heat to the water. In extreme...
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    You mentioned a burnt wire. I have found that...

    You mentioned a burnt wire. I have found that these units with ignition problems need yearly cleaning of the exchanger. I would remove the top and use a spray hose to wash out the debris.
    I...
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    there are no "knowns." There are things we know...

    there are no "knowns." There are things we know that we know. There are known unknowns. That is to say there are things that we now know we don't know. But there are also unknown unknowns. There are...
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    I'm still puzzled over the 3.2B ROI. Especially...

    I'm still puzzled over the 3.2B ROI. Especially when others are in various stages of development.

    Good link. Wonder sometimes is who really wants this developed. Sometimes the futuristic writers...
  6. Yup. Down stream.

    Yup. Down stream.
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    I knew a controls guy that had a Barber Coleman...

    I knew a controls guy that had a Barber Coleman 8000 network he wired into his house. Why? Because he could I guess. He sold the house and I hope he removed the network before the new owners moved...
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    We (hopefully) all know what your stating. I'm...

    We (hopefully) all know what your stating. I'm sure most have learned the basics of fire. Actually a fire will go out if deprived of fuel, heat. or an oxidizer.
    My issue was about your statement...
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    Any mix of gasses will produce more pressure when...

    Any mix of gasses will produce more pressure when heated than a single gas. Pressure also depends on the type of gasses. Some will produce a larger change temperature for a given amount of heat....
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    My training stated that both heat and oxygen were...

    My training stated that both heat and oxygen were deprived with CO2. It was a time ago so maybe they changed their minds.
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    Every time I tried, I couldn't make air burn....

    Every time I tried, I couldn't make air burn. Tried and tried..... Just how do you think they operate their pneumatic tools...Or haven't you seen them in any tire change out????? Or on damage...
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    Google bought Nest for some 2 Billion or...

    Google bought Nest for some 2 Billion or something like that. Now tell me...How long is the ROI selling t'stats on a 2Bil investment??. That, by the way, competes with a whole bunch of other t'stat...
  13. Let's all book a flight to Oregon. Then we mud...

    Let's all book a flight to Oregon. Then we mud wrestle to see who gets first dibs.
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    You're kidding, Right??

    You're kidding, Right??
  15. There are a lot of things we don't know about the...

    There are a lot of things we don't know about the system.
    What I'm wondering is what you've called the silvery thing. Seems if it's an air vent a vacuum might occur when the steam valve closed and...
  16. Don't forget to look downhill. If the trap can't...

    Don't forget to look downhill. If the trap can't flow the coil won't heat. Any reverse pitch or sagging pipe can create these problems.
  17. I think the points made is there is NO GOOD...

    I think the points made is there is NO GOOD REASON to wear jewelry on the job.

    I used to wear a Hopi ring when one day a glob of silver solder dropped on it and I thought it went nuclear. Very bad...
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    I doubt NASCAR was worried about leaking are...

    I doubt NASCAR was worried about leaking are through permeation. I am more likely to think they were more interested in pressures. Anyway I really think for us normal people, it's a gimmick.
  19. You might have a TXV that's hunting causing...

    You might have a TXV that's hunting causing fluctuation in amp draw,
    If your wanting to predict failure keep records over time of megaohm readings. Keep in mind a megger won't predict wear,...
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    Ya, design data is approximate and like has been...

    Ya, design data is approximate and like has been said wind, snow cover, radiant gain are not always predictable.
    In the spirit of experimentation I might plug a couple of burners, if the furnace...
  21. The coil is vented. See picture page one.

    The coil is vented. See picture page one.
  22. Replies
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    Hvac techs know that the pressure of gasses in a...

    Hvac techs know that the pressure of gasses in a closed container are the sum of all the individual gasses and are proportional to temperature.
    NASCAR chooses to use nitro because they can predict...
  23. Seems like a lot of techs before you have done a...

    Seems like a lot of techs before you have done a lot that hasn't worked. Maybe look beyond the coil, strainer, and trap. We know the return piping needs to be pitched toward the return main. Checking...
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    Yes, like i mentioned in a post earlier vena...

    Yes, like i mentioned in a post earlier vena contracta will draw in air. They use that to an advantage in diffuser design.
    I'd be more apt to believe it might happen with a specific venturi design...
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    Of course. That's why we can have static only or...

    Of course. That's why we can have static only or velocity only exist in a pipe, duct, any enclosed space where fluids flow.. And of course the mix of the two.
    But the venturi gives us the mix. It...
  26. Not just DIYers. The Air Force showed a picture...

    Not just DIYers. The Air Force showed a picture of a guy that fell off a wing but caught his ring finger on a control surface. He left his ring and finger on the wing.

    I saw an electrician with a...
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    I'm sure some have looked for an equation to...

    I'm sure some have looked for an equation to calculate suction at a venturi and what conditions are needed for that suction at the venturi to fall below atmospheric given the pressures involved.
    I...
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    There is a very good reason to know why a cap has...

    There is a very good reason to know why a cap has polarity markings. In an ac circuit caps pass current. In a dc circuit they block current. That's why in an ac circuit they will work both ways.
    So...
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    Venturi draws is other fluids in the direction of...

    Venturi draws is other fluids in the direction of mass flow. Que'No?!
    So many theories here deal with pressurized fluids exiting a leak. A venturi uses divergent/convergent shapes to create a...
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    A good old spreadsheet.

    A good old spreadsheet.
  31. Replies
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    It seems in the examples given like a paint...

    It seems in the examples given like a paint sprayer or a venturi in a carburetor the induced fluid was joined with the other in the direction of flow. If liquid or gas they are both fluid.
    With a...
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    BBeerMe, What's a fitter doing building a ducted...

    BBeerMe, What's a fitter doing building a ducted house? Hiring tinners? Is that allowed?
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    Agree. The best way for most two stories is...

    Agree. The best way for most two stories is separate systems. I really don't like forced air heating. It's noisy and blows stuff around. If you have pets and a central air filter the ducts will grow...
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    Early on the supplies were in the interior and...

    Early on the supplies were in the interior and returns were below windows. My first house was built in 1918 and originally had a gravity furnace with this ducting. I think the thought was cold air...
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    Not all agreements pay "on call" wages. One union...

    Not all agreements pay "on call" wages. One union shop gave a $50 gift certificate.
    Do I understand the agreement of 8 hours pay is over and above pay that might be earned if called out on a job?...
  36. Thread: how is it?

    by hvacker
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    I did the controls in a woman's prison that was...

    I did the controls in a woman's prison that was being built here some years ago. It was occupied before I finished and the guard was taking me to the area to do the work. The girls started whistling...
  37. There is also another work around that can make...

    There is also another work around that can make employment happen. That's having a contractor hire you and then join the Union. If a contractor wants you the Union will allow in as they probably...
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    The dying of an Empire. Too bad it happened so...

    The dying of an Empire. Too bad it happened so fast.
    Maybe it was the vote. Maybe it was our beginnings in slavery. Maybe it was our constitution was all about white people. maybe we were spring...
  39. I was first hired at a Union shop as a tech but...

    I was first hired at a Union shop as a tech but non-union as the local union (sheet metal workers) couldn't provide techs as at the time (1970) their job was to train sheet metal. After a couple...
  40. I think there's a lot of reasons to care about...

    I think there's a lot of reasons to care about what your called.
    I was talking to an Hvac manager who was getting cards made for his guys. They said "Serviceman" I asked why "Serviceman"? Some...
  41. Most people can't spell HVAC anyway.

    Most people can't spell HVAC anyway.
  42. My understanding is that a household refrigerator...

    My understanding is that a household refrigerator is designed to run 90% of the time. If other info is out there please chime in as I'm not a refer tech.
    I do know that a commercial TXV system...
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    Thanks BBeerme for your insight. I live on a...

    Thanks BBeerme for your insight. I live on a private dirt road with 10 other homes and we get washed out often during monsoon storms. Everyone wants to blame responsibility for repair on whoever is...
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    What worries me way more than the noise is you...

    What worries me way more than the noise is you saying the boiler was "making a ton of vibration and noise" Boilers aren't supposed to do that. Boilers, even very large ones don't do that. They are...
  45. Is that age 71 or 1971. With all the...No wait...

    Is that age 71 or 1971. With all the...No wait those numbers could be in alignment. Both experience and age.
    My question is irreverent. I'm a tad old myself.
  46. It's because the general public can't spell HVAC....

    It's because the general public can't spell HVAC. or even interpret what it could possibly mean.
    I once told a group when asked that for the most part I imported pharmaceuticals. What followed was...
  47. EZ BBeerme, you know I'm lactose intolerant and...

    EZ BBeerme, you know I'm lactose intolerant and have abandonment issues. As a tin knocker it's rude for you to add to that load I need to Carry.
    Ohhhhh Why can't we all just get along???????????????
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    Usually a traverse is made in the supply duct to...

    Usually a traverse is made in the supply duct to measure cfm then the grills are read. The difference is the system effect or loss. Another is to use a special blower with different orifices but the...
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    How about a picture Space Racer. One novel...

    How about a picture Space Racer.


    One novel idea I remember was at the 2nd shop I worked at. The owner had bid a job where needed a large electric pipe bender He bought the bender, completed the...
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    The only lift that was profitable to outright own...

    The only lift that was profitable to outright own was a Gennie lift that was hand operated and was skinny enough to fit through a ceiling panel. It was fairly cheap $500 used from the rental company...
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