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  1. Replies
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    Unfortunately if you can't measure the shut off...

    Unfortunately if you can't measure the shut off head you can't determine what size impeller that is in it without tearing it down. In your case I would make certain there is no electrical problem and...
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    Good luck crazy. I'm really looking forward to a...

    Good luck crazy. I'm really looking forward to a lot of stories. It should be interesting.
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    Have you tested (measured) the dead head pressure?

    Have you tested (measured) the dead head pressure?
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    If you want to know what is going on with a pump...

    If you want to know what is going on with a pump you need to test it against the pump curve. As previously mentioned a pump will draw more current moving water than developing head. You need to test...
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    Post the pump curve if you have it. When you...

    Post the pump curve if you have it. When you tested the shut-off head did it match the pump curve?
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    Let's Share Some Stories

    All of us have some interesting stories that only those in our line of work care to hear. I'll start it off but want to hear yours.
    A lady in a facility I recently balanced had always been cold and...
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    The system won't be stable Poodle but it will...

    The system won't be stable Poodle but it will heat the building flawlessly. That's why this is difficult to explain. Moet engineers don't really understand what they have designed on water systems...
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    If you are asking me pecmsg I don't know. It...

    If you are asking me pecmsg I don't know. It wasn't part of the HVAC system so not part of my work. I only know they could make ice anytime and melt it anytime.
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    What has made it difficult BBeerme is the system...

    What has made it difficult BBeerme is the system heats really good and that has everyone convinced everything is OK. I basically have to accurately predict the future in regards to how the valves...
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    I met the owner on the job today to make sure the...

    I met the owner on the job today to make sure the dampers were fixed. He was pissed at his guys and told me he doesn't like having the problem either. They have taken actions that have helped but...
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    That's what I was trying to say Brad but couldn't...

    That's what I was trying to say Brad but couldn't come up with the words.
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    I did TAB on a hockey arena. All I know about the...

    I did TAB on a hockey arena. All I know about the chiller is they could produce ice anytime they wanted. This was an indoor pro arena.
  13. If I understand what you are trying to achieve...

    If I understand what you are trying to achieve listen to the control guy. The idea of controlling space static pressure by reading airflows and doing a calculation from that data NEVER WORKS. If...
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    True brad we could discuss it to death if nothing...

    True brad we could discuss it to death if nothing else. To do what you said about return temperature it would require balance of the individual circuit setters. There are so many miss-sized I don't...
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    LOL :angel::gah: :cheers:

    LOL

    :angel::gah:

    :cheers:
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    Coins For Corny'S Collar

    Corny's hate posts lately have me wondering if we should be concerned about his mental status. If a storm comes along and takes down some power lines he might get out of the yard and pee on a live...
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    Good point pecmsg.

    Good point pecmsg.
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    Agree pecmsg it is understandable for the...

    Agree pecmsg it is understandable for the installer to miss a damper occasionally. In that case I have cut the insulation off and got the screws out myself. A lot of times a hole drilled by the blade...
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    The cavitation I'm concerned that might happen is...

    The cavitation I'm concerned that might happen is at the outlet of the control valve. The valves that are controlling almost closed will have a lot higher velocity at the outlet than normal. The...
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    Flanges would solve all your problems if you can...

    Flanges would solve all your problems if you can use them.
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    You hit on how I would prefer to handle this when...

    You hit on how I would prefer to handle this when you suggested setting the total flow to each floor. If I had the branch circuit setters I would set each floor to 2/3 design and have the outside...
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    I can't proportion the water to each floor...

    I can't proportion the water to each floor because there are only circuit setters at each coil and none for the loop. As oversized as some of the control valves are slowing the loop speed will not...
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    It is a two story building with 22 FPB'S. I have...

    It is a two story building with 22 FPB'S. I have advised them that since the control valves are two-way equal percentage that balancing the water is not only a waste of time but the system will work...
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    The boxes are parallel. The leaving air...

    The boxes are parallel. The leaving air temperature is good. The control valves were originally sized by Cv. The control valves are two-way equal percentage.
    The coil sizes were changed but...
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    One of the problems is there is a 1" valve that...

    One of the problems is there is a 1" valve that has a design water flow of 0.6 GPM. Another one is a 3/4" valve with 0.6 GPM design.
  26. Thanks for all the input. I have just re-read all...

    Thanks for all the input. I have just re-read all the posts and all you guys made my day. I've said it before but it's worth saying again "THIS SITE IS GREAT".
    I started a post on water where I have...
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    Yeah 129 inches of water. That isn't the drop...

    Yeah 129 inches of water. That isn't the drop across the valve but the drop through the circuit setter orifice.
    Control valves are normally one pipe size smaller than the line size but in this case...
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    Water Balance Fun

    I'm doing TAB on a job that has been interesting from start to finish. I thought you guys might like to hear about some of the fun.
    The building has a history of not heating or cooling properly. For...
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    Another problem solved on HVAC Talk.

    Another problem solved on HVAC Talk.
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    I wasn't taking a poke at you pmoo. There is...

    I wasn't taking a poke at you pmoo. There is always someone that has an experience you don't no matter how extensive your experience is. I'm one of the oldest on here and it happens to me constantly.
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    Sounds like now you need temperature averaging...

    Sounds like now you need temperature averaging with the results sent to the AHU. There are control guys here that will fix you up when they see this post. That's not my specialty.
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    You are welcome Tremblay. It's great you have the...

    You are welcome Tremblay. It's great you have the AMCA publication because system effect comes in many ways and can kill the system performance. Air rotation verses duct elbow direction especially at...
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    The difference is the turbulence of the air. I...

    The difference is the turbulence of the air. I know that doesn't tell you much but if you look up "System Effect" in the AMCA manual you will better understand. They have some examples of different...
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    Please understand we don't know the extent of...

    Please understand we don't know the extent of your knowledge. Not knowing your qualifications my advice was simply make sure you know what you are doing. We don't know the extent of what you are...
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    Agree with CHOPS. Set the speed you want on the...

    Agree with CHOPS. Set the speed you want on the VFD and forget about.
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    If you are charging flooded lead acid batteries...

    If you are charging flooded lead acid batteries you need to do a lot more than monitor one fan. Start with the authority that has jurisdiction which should be the fire marshal and proceed from there....
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    The object appears to be maintaining the room...

    The object appears to be maintaining the room differential pressure. If so do it like the hospital isolation rooms do it. The only reason you are concerned about the fan is the result of it's...
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    I think he has a closed valve brad. Unlike...

    I think he has a closed valve brad. Unlike chilled water it doesn't take a lot of hot water to heat.
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    Hillary and Obama don't live there.

    Hillary and Obama don't live there.
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    TAB is enjoyable. I will email you the...

    TAB is enjoyable. I will email you the calculations I started with. That will give you something to analyze. Part of the problem on this job is I have way too much fan for heating. That is difficult...
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    I dumped the last two I found in their laps. This...

    I dumped the last two I found in their laps. This is a tough job that has a history of comfort problems to the point most people working there are convinced it can't be fixed. Almost all the FBB'S...
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    No problem Cajun. The screws were put in during...

    No problem Cajun. The screws were put in during the damper installation. Sheet metal guys know they are supposed to leave all balance dampers wide open. The ones that are closed almost always have...
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    Balance Dampers Locked With Screws

    I am balancing a building equipped with FPB'S. I have gone to 5 FPB'S and found 4 balance dampers that had screws holding them in place. This eats a balancers time in a hurry.
    What is so difficult...
  44. Thread: Why Trump?

    by WAYNE3298
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    The Obama wave was equivalent to throwing a...

    The Obama wave was equivalent to throwing a pebble in the ocean. There is no hope for anyone that can't see the difference in Trump's economy and Obama's.
    Every month under Obama the job numbers...
  45. Thread: Why Trump?

    by WAYNE3298
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    Yeah corn Obama did a great job. He understood...

    Yeah corn Obama did a great job. He understood there was a new normal meaning we were never going to thrive again and expect 15 to 20 million Americans living in poverty. Trump hasn't got that yet so...
  46. Thread: Why Trump?

    by WAYNE3298
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    I love Trump because he is crude (just like me),...

    I love Trump because he is crude (just like me), I love Trump because he defends himself no matter what. I love Trump because he gets things done no matter who doesn't like it.
    I love Trump for...
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    I think the valves are DN20 (3/4") not PN20. I...

    I think the valves are DN20 (3/4") not PN20. I have been told 2 or 3 things about the plug but didn't know what to believe. I'll be watching brad to see what you find out. The most logical thing I...
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    His description fits single duct boxes with...

    His description fits single duct boxes with hydronic heat. The coil can be on the box inlet or outlet or duct mounted but on VAV'S they are almost always on the box outlet.. He said the pipe is cold...
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    You are not getting hot water flow. Check for...

    You are not getting hot water flow. Check for plugged strainers and nonfunctional valves or closed isolation valves.
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    Adam Schiff College Class Ranking

    Does anyone know where Schiff placed in his college class. Must not have been too good because I can't find it.
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