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Recent content by Hileg

  1. Hileg

    GFI Protection

    How is the setting established for a gfi on main switchgear. I know it cannot be over 1200 amps and 1 second. What criteria is used to determine the exact setting. Thanks
  2. Hileg

    Voltage levels for Commercial building

    I am having to change incandescent lamps out in our lobby about once week. I've considered replacing them with flourescent bulbs but don't want to remove my flags until I understand what is going on and why these bulbs are prematurly burning out.These are bulbs rated at 120 volts single phase...
  3. Hileg

    Dry Air

    Why is is on a phycrometric chart that the words "dry air" are used when the air could contain moisture or humidity? Does this mean that anything not at saturation is dry regardless of moisture content. Thanks
  4. Hileg

    400 CFM per Ton

    Thank you all, Hileg
  5. Hileg

    400 CFM per Ton

    Hvac68 is delta h enthalpy. Thank you, this really helps.
  6. Hileg

    400 CFM per Ton

    A rule of thumb in air conditioning work is that 400 cfm of air is equal to 1 ton. If 400 cfm of air and a delta T of 20 degrees is achieved, this is equal to only 400X20X1.08=8640 btu/h.. This is not 12000 btu's. What am I missing here besides a college education.
  7. Hileg

    Hi effieciency dx units

    Another question is do higher efficiency units have larger evaporators versus lower seer unit evaporators or is the larger eqiupmnet only at the condensor coil?
  8. Hileg

    Hi effieciency dx units

    Sterl, I think this is more along the lines of what I have heard about Hi effiency units. I don't quite understand everything your saying, but it sounds like the higher eff. units do more sensible heat removal versus latent. And this is why the t-stat must be lowered to compensate for the higher...
  9. Hileg

    Hi effieciency dx units

    Thank You
  10. Hileg

    Hi effieciency dx units

    Could someone please explain how a hi effieciency dx split system is designed? Does a 4 ton 10 seer remove the same amount of latent and sensible as a 4 ton 13 seer? Is the volume of air the same for both units (2000 cfm).If I am considering replaceing my 4 ton unit with a higher efficiency unit...
  11. Hileg

    O/A and Return Air Louvers/Dampers

    What is a good lubricant to use on dampers that need lubrication and how should it be applied? Thanks
  12. Hileg

    Cooling Tower Condensor Water Control

    Does anyone have a good way to control/stage 3-600 ton cooling towers? Should a control sequence be created using wet bulb to stage these 3 towers. The fans do have vfd's.Thanks
  13. Hileg

    Chiller Tube Sheet Corrosion

    Does anyone know why chiller copper tubes are able to be pressed into steel tube sheets. Doesn't this create electrolisys? I know plumbers and hvac mechanics are taught to always use a dielectric fitting type connection whenever this combination is formed. Why do chillers not have to conform to...
  14. Hileg

    Smal Household Water Pessure Tank with Pump

    Does anyone know where I can find some information for design considerations for a small water pressure tank system for a small home. Thanks
  15. Hileg

    Heat load of a Computer Room

    Thank You for your help
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