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  1. gregha04756

    hvac control diagrams how to make it?

    simsd, Good points. Good Luck, Greg Hansen
  2. gregha04756

    hvac control diagrams how to make it?

    Just to expand a bit on the previous posts: AI = Analog Input = Physical property or quantity that does not have a discrete value or state, e.g temperature and pressure. Devices such as thermistor temperature sensors and duct static pressure sensors are connected to analog inputs. Typically one...
  3. gregha04756

    Baeboard heating - VAV cooling

    atlas06, Yes, makes sense to me. Good Luck, Greg Hansen
  4. gregha04756

    Baeboard heating - VAV cooling

    Hi remp, The typical heating sequence I have seen, which is essentially what you stated, is: 1. Position damper for minimum airflow 2. Switch on peripheral heat (baseboard) 3. If space temperature isn't satisfied by peripheral heat only, open reheat valve (modulate it if it's a proportional...
  5. gregha04756

    pnuematic thermostat calibration?????

    Assuming the pneumatic device can be replaced with electronics, how should the electronic one be calibrated? This is not a facetious question, I work with digital thermostats, specifically BACNet compatible ones used in DDC. I "calibrate" the 'stat with a digital thermometer (which itself has to...
  6. gregha04756

    Definition of "fast paced" with respect to organization size

    "Fast paced" is a euphemism for "Out of control". Good Luck, Greg Hansen
  7. gregha04756

    Audio File Question

    Hi m777182, I'm afraid, unfortunately, I don't have much insight to share that would point you in the right direction. My main thought was that I might be able to decode some blinding fast Eddie Van Halen solo or such, based on the idea that the loudest instrument masks the others and would...
  8. gregha04756

    Audio File Question

    Hi Mike, Thanks for the reply post, and your interest. Besides enjoying(?) the challenge of Windows programming, I am an amateur musician. I also have an interest in digital signal processing. Combining these interests (programming, music and DSP) has led me to try to develop an application...
  9. gregha04756

    Audio File Question

    Hi Mike, I have been dabbling at writing some programs to analyze WAV files too, so it's gratifying to see a post from someone with the same interest. Here is a quote from a site I used as a reference: The site URL is http://ccrma.stanford.edu/CCRMA/Courses/422/projects/WaveFormat/ So it...
  10. gregha04756

    literature for introduction to C programming

    "The C Programming Language" ISBN 0131103628 by Brian Kernighan and Dennis Ritchie is excellent. Good Luck, Greg Hansen
  11. gregha04756

    CONDENSATION PROBLEMS

    The absence of a dedicated combustion air inlet may be a code violation. With respect to the condensation problem, a heat-recovery ventilation unit such as a VenMar should do the trick. I had a ventilation unit in my house, they do an excellent job controlling humidity and making the living...
  12. gregha04756

    RPG

    Do you want to learn RPG III or RPG IV? Bob Cozzi has a website: http://www.rpgiv.com devoted to RPG IV developers. He also has several books on RPG IV programming. I don't know too much about RPG III, however. There's a ton of websites devoted to RPG, Google "RPG IV programming" and you'll...
  13. gregha04756

    Lifting Pumps

    Is the height restriction because the well depth is greater than the building ceiling height, and pipe connected to the pump exceeds that? How about lift, cut (or disconnect) free end of pipe, lift, cut pipe, and so on... Post someone to watch that the top end of the pipe does not contact...
  14. gregha04756

    Reheat control valve on supply vs. return

    I think the valve is on the outlet side because the water is cooler, and less stressful to the valve components. Good Luck, Greg Hansen
  15. gregha04756

    Software to Program With Graphics

    Another suggestion: Although I have not personally done any programming with Microsoft Visio, I have seen a fairly hefty commercial HMI (Human-Machine Infterface) program built with it. It's very easy to create graphical "shapes", or objects, that can be manipulated programmatically. There is a...
  16. gregha04756

    air to air exchanger application

    Consider contacting one of the several manufacturers of heat recovery ventilation units, such as Nu-Air, Venmar, Lifebreath. Maybe one of them has encountered an application like this. Good Luck, Greg Hansen
  17. gregha04756

    Working in Canada

    Hi redgdon, The Canadian Council of Professional Engineers (CCPE) website should be a good source of information for you. There is a section for immigration and assessment, and links to each of the provincial and territorial association websites. In New Brunswick, where I reside now, the PPE...
  18. gregha04756

    DataExchange in MFC

    Hi danielp0, Do you have a copy of the book by Jeff Prosise, "Programming Windows with MFC"? It is one reference you might want to consult. You could probably figure out what you need to do with the information in this book. Here is a suggestion. In the child dialog class, do you have a handler...
  19. gregha04756

    Pressure Reducing Valve in pump suction line

    Hi KRB, Let me preface my comments by saying I am new on this forum, and haven't done much mechanical engineering for a while. However, with that disclaimer, here are a couple observations for what they're worth. If you put a PRV on the pump suction, and the header pressure drops to the point...
  20. gregha04756

    Schematic Dwgs

    Ugly's Electrical References (ISBN 0962322970) is a handy little concise reference book on electrical topics. Good luck. Expactation is the mother of disappointment.

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