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  1. Replies
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    The engineer of record has the responsibility of...

    The engineer of record has the responsibility of getting to the bottom of disputes like you have experienced. If you can't get resolution any other way file a complaint with the state board of...
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    I am doing TAB on this building and need to slow...

    I am doing TAB on this building and need to slow down the supply fan some and speed up the exhaust fan to make the locker room negative. Right now I am waiting on the installing contractor to fix...
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    You got that right BBeerme!!

    You got that right BBeerme!!
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    There is no soft copy. The book is big, hard copy...

    There is no soft copy. The book is big, hard copy only and very good. NEBB headquartered in Arizona will sell you a copy. David Bevirt was with NEBB for years.
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    You've been a big help and many thanks. The...

    You've been a big help and many thanks. The Daikin service guy showed me the exhaust fan speed set point and the maximum allowed speed but didn't show me how to get to it. He gave me the access code....
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    The present set up is for the exhaust fan to run...

    The present set up is for the exhaust fan to run full speed anytime it runs. The supply fan modulates between 60% and 100% of the maximum fan speed entered into the program. I need to increase the...
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    Plus or minus 5% to start with is BULL CRAP. Did...

    Plus or minus 5% to start with is BULL CRAP. Did the commissioning agent provide proof that his equipment was calibrated? How do you know that he actually used the calibration print out for his flow...
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    The Daikin control capabilities are about the...

    The Daikin control capabilities are about the same on all the units including the RTU'S. Basically you pick what you want.
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    Need Help With Daikin Controls

    I need to change the motor (fan) speed on some Daikin make up air units. I thought the fan speed would be under commissioning but couldn't find it there. These are direct drive fans.
    Please tell me...
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    Friends On This Site

    In the past I have not always been successfully added friends. I value the friends I have here and will NEVER intentionally reject a request. If that has happened to anyone it was not intentional.
  11. Nahas there is no hostility whatsoever in my...

    Nahas there is no hostility whatsoever in my reply. I spent 25 years designing these systems and another 20 years balancing them. I understand what you are trying to do but we can't help you a lot...
  12. Hire a balance contractor that knows what they...

    Hire a balance contractor that knows what they are doing. Ask several design engineers who is the best and don't argue price. He should be able to tell you anything you need to know and make it work...
  13. Your best bet is to have CO2 control that...

    Your best bet is to have CO2 control that provides outside air any time the CO2 rises above where you set it. The stale air should be exiting the house through the heat wheel but it sounds like fresh...
  14. The term static pressure in a dynamic system in...

    The term static pressure in a dynamic system in my opinion is a contradiction in terms. I have always taken static pressures at the equipment because it is required but I don't have much trust in...
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    Hospital room pressures depend on how the room is...

    Hospital room pressures depend on how the room is used. In one case you are trying to prevent the patient from contacting a bug. In another case you are trying to prevent them from infecting others....
  16. A BSME is the best education you can get. No...

    A BSME is the best education you can get. No matter what direction you decide to take it will benefit you. In my opinion nothing is more boring than accounting.
    After you get your BSME you can get a...
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    Use the line at will bradlukeD. I think the...

    Use the line at will bradlukeD. I think the difference in the negative buildings we both have seen is location in the country. In Kansas we have some humid days but not like Florida. How often do you...
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    I trace pressure profiles with a cigarette...

    I trace pressure profiles with a cigarette lighter. The cheapest and most accurate tool for that purpose in the world. I have done it so much I can normally estimate the pressure pretty close.
    A...
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    The main thing wrong with the exhaust fan in the...

    The main thing wrong with the exhaust fan in the picture is the variable pitch sheave is adjusted wrong and the driven sheave is wore out.
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    numbawunfela :cheers:

    numbawunfela

    :cheers:
  21. Fortunately hot water heat is very forgiving. A...

    Fortunately hot water heat is very forgiving. A lot easier than chilled water.
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    You have a point valdelocc but I think it is...

    You have a point valdelocc but I think it is limited to sheaves with a minimum of 4 grooves because the grooves get smaller in height and the belts can jump. I'm sure you have seen angular alignment...
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    Had to mess with you guys a little. As previously...

    Had to mess with you guys a little. As previously stated here by n-e-w-Jerz angular alignment is not as critical as simply getting the sheaves straight across from each other. Not saying it shouldn't...
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    I have to admit I never tried self alignment on...

    I have to admit I never tried self alignment on sheaves that were perpendicular to each other.
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    You don't need a laser, string or anything else...

    You don't need a laser, string or anything else to get perfect sheave alignment. Leave the driven sheave set screw loose and start the motor. The belt tension will bring the sheave into alignment...
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    Use the belt that matches the sheave groove size....

    Use the belt that matches the sheave groove size. Any belt can be over tightened. There are belts that will last a long time in any size you want. They used to call them Green Belts but you tell an...
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    I have gone directly to the owner and found out...

    I have gone directly to the owner and found out the GC had been paid even though he swore he hadn't been. I got my money that day. A good friend of mine had been a GC and he shared their money...
  28. That method is for constant volume systems. I...

    That method is for constant volume systems. I always set the flow for 120% (if possible) prior to balancing. It takes some experience but after a while you get a good idea of where to set each...
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    The main problem I had with general contractors...

    The main problem I had with general contractors is they thought they were god on their projects. On schedules I told them I know how long it should take but how long it really takes depends on how...
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    I wish I could have seen you do that. Guys like...

    I wish I could have seen you do that. Guys like that don't make it and deserve what they get.

    An Architect called and wanted me to sub air balance on a building to him. For some reason I didn't...
  31. No matter which manufacturer you decide on make...

    No matter which manufacturer you decide on make sure the specification is clear how you want it to operate.
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    Yeah pay when paid has been litigated and the...

    Yeah pay when paid has been litigated and the court ruled pay when paid was a timing mechanism for when the contractor got paid not whether they got paid. There is a world of difference between that...
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    That's a good way to handle it but where I'm at...

    That's a good way to handle it but where I'm at it took 6 months to get paid and extras were next to impossible to get. I didn't sign Pay If Paid contracts until all my competitors did. It was either...
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    The problem with balance work is everyone knows...

    The problem with balance work is everyone knows how to do it even if they know nothing about it. There are hood holders and there are balancers. Sometimes you have to meet force with force. I had an...
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    As a balancer the only way to force others to do...

    As a balancer the only way to force others to do their job is to tell them balance can't be done until the install is complete in accordance with the specs. If the spec includes NEBB or any other...
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    Agree orion. Too bad you aren't here to look at...

    Agree orion. Too bad you aren't here to look at the controls. I'm going to work around the problem but it has cost me a lot of time.
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    This was overlooked and when I brought it to...

    This was overlooked and when I brought it to everyone's attention they thought I was wrong. It took a while to get their attention. This building is snake bit. It is thirty plus years old and has...
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    Good point orion. This problem dealt me fits...

    Good point orion. This problem dealt me fits until I finally figured out what was happening.
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    I put it in the occupied mode with the box that...

    I put it in the occupied mode with the box that gave me a choice of occupied, unoccupied or automatic. I don't know if that is considered an override.
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    Question Concerning Alterton Controls

    I am doing TAB on a school and the work has to be done after school hours. The Alerton controls have a glitch that I don't understand. In the normal scheduled mode the controls work as they should....
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    You were in the field in the 90's when DDC was...

    You were in the field in the 90's when DDC was still in it's infancy. DDC has changed some since then but mostly for the better. The main thing with the instruments is you learned how to use them.
  42. There have been two systems tested that I am...

    There have been two systems tested that I am aware of. Tidal turbines and Freon generators in the ocean. The Freon thing works similar to heat recovery generators that use differential temperature to...
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    I'm not much on computers either but liked Quick...

    I'm not much on computers either but liked Quick dos because it was easy to use.
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    Remember though Bill Gates bought Quick Dos for...

    Remember though Bill Gates bought Quick Dos for $50,000. That's what got him up and running.
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    One of the best things you can do starting now is...

    One of the best things you can do starting now is follow this site religiously. There is no limit to what you can learn here. Ask any question you want and someone or several someone's will have the...
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    The reason the MAU is designed for less airflow...

    The reason the MAU is designed for less airflow than the hood exhaust is to keep the kitchen negative. As VTP99 said the RTU's have to make up for the heat load but that extra will come from the...
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    I'm the same way BBeerme. When I was in design...

    I'm the same way BBeerme. When I was in design engineering they came to me and told me their plans for me. I was supervising 30 people but wasn't really a boss. Their plans included my becoming...
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    My dads favorite saying was "the man that knows...

    My dads favorite saying was "the man that knows how to fix things will always have a job. The man that knows why will always be his boss"
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    I would go to the trade schools every day and not...

    I would go to the trade schools every day and not take no for an answer. You should take a minors release with you and be nice but determined to get in. Tell them you are willing to do class work...
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    Something else amusing on this job. My brother...

    Something else amusing on this job. My brother and I went to start finishing the air balance this afternoon. On the way in the building I told him I had gone through all the paper work and we should...
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