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  1. looks like cheap junk to me. i do hope you never...

    looks like cheap junk to me. i do hope you never want to provide hot air through this thing.
    there are proper ways selecting a commercial diffuser for the application.
    try a company like Titus,...
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    while it is true that all dampers will have a...

    while it is true that all dampers will have a resonance frequency, the reputable vav manufacturers test their units and design the dampers to have a frequency outside of the normal operating range....
  3. Thread: Vulcan VAV Boxes

    by nik99
    Replies
    3
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    531

    it has been many years since i have seen one of...

    it has been many years since i have seen one of these. post a couple pictures to jog my memory and i can probably help you with your problems.
    what controls are on them?
  4. Thread: Pneumatics

    by nik99
    Replies
    12
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    894

    as prevously stated there are lots of variables...

    as prevously stated there are lots of variables and different systems.
    however 3-8 psi is very very common. 3 or lower being being full open, 8 or higher being full closed.
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    the unit comes with a door interlocking...

    the unit comes with a door interlocking disconnect on the enclosure. why would you not just run direclty from the breaker to that switch?
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    New York is home of Carrier, can't fight VVT...

    New York is home of Carrier, can't fight VVT there, politics, jobs etc...
    Carrier doesn't build a fan box.
    I would also use hot water instead of electric as their electricity is expensive and they...
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    When you use this type of controller,...

    When you use this type of controller, direct/reverse acting and normally open/closed have no relationship to each other.
    you can have any combination of the above.
    it is not like just using an...
  8. Thread: Titus Box

    by nik99
    Replies
    2
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    513

    http://www.titus-hvac.com/ecatalog/getfile2.aspx?f...

    http://www.titus-hvac.com/ecatalog/getfile2.aspx?fileid=5781

    they don't post the charts themselves (call Titus for copies) but you can calculate the values using the K factors on this sheet.
  9. Thread: VAV

    by nik99
    Replies
    10
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    1,029

    A vav manufacturers catalog is probably the...

    A vav manufacturers catalog is probably the easiest place to start.

    http://www.nailor.com/onlinecatalogs/CAT-06/CAT1START.pdf
  10. a vav box air volume has nothing to do with...

    a vav box air volume has nothing to do with smoke.

    the noise from the box selections will drive everyone out of the building anyway.
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    answer above gives you a very high torque...

    answer above gives you a very high torque actuator for a typical damper.

    the real answer depends on the type of damper used and the manufacturer.
    very low leakage dampers are tightly fitted and...
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    that is a very low torque for a damper that size....

    that is a very low torque for a damper that size.
    if the damper twists slightly as the metal contracts in the cold the torque will increase dramatically, could be dirty bearings, moisture buildup in...
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    913

    RH is no good unless we tie to a specific...

    RH is no good unless we tie to a specific temperature.
    Where did you get dew point info?
  14. Replies
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    913

    i tried this, they either can not or will not...

    i tried this, they either can not or will not give me an answer.
  15. Replies
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    3,888

    USP 797, United States Pharmacopia is the...

    USP 797, United States Pharmacopia is the relevent standard for pharmacy areas in the US. Also check the ashrae/aia sources above.
    For bio-safety labs there are specific requirements that I think...
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    913

    Pharmacy Humidity Childrens Hospital

    I am working on project for a childrens hospital new pharmacy area.
    Basically the question that has arose is "what should be the humidity level in this room".
    This is not as straightforward as it...
  17. Replies
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    3,888

    Latest standard for HVAC design is ASHRAE...

    Latest standard for HVAC design is ASHRAE Standard 170-2008
    Ventilation of Health Care Facilities
    You should also review the relevent handbook chapters.

    There is also the American Institute of...
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    678

    With regards to airflow, laminar means...

    With regards to airflow, laminar means non-aspirating or non-mixing. A laminar flow diffuser will create basically a column of air below it that does not mix appreciably with room air. Thats why they...
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    1,987

    For the Nailor damper (or Ruskin) to meet the UL...

    For the Nailor damper (or Ruskin) to meet the UL requirements the factory sleeve must be there, and have the coating intact.
    You cannot mess around with that and meet their factory UL compliance,...
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    1,647

    rip it out quick and put in fibreglass.

    rip it out quick and put in fibreglass.
  21. Replies
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    491

    mechanical drawings are widthxheight...

    mechanical drawings are widthxheight
    architectural drawings are heightxwidth

    i have no idea why?
  22. Thread: Electric Heaters

    by nik99
    Replies
    6
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    621

    maxster Great you tube link, never seen that...

    maxster
    Great you tube link, never seen that before.
  23. Replies
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    2,815

    most of the bushings used on dampers are called...

    most of the bushings used on dampers are called self lubricating, meaning that they are usually oil impregnated bronze, or a type of plastic.
    Now before everyone here ridicules the...
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    this is the best source of info. lots of good...

    this is the best source of info. lots of good stuff but long and tedious reading.

    http://www.cdc.gov/ncidod/dhqp/gl_isolation.html

    in practice maintaining the pressure difference is very...
  25. Replies
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    1,883

    both the II and IIA are made by krueter and are...

    both the II and IIA are made by krueter and are essentially identical inside.
    if you grab a recently failed one and take it apart (note you will never get it back together) inside you will see a...
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    the assembly is the constant volume regulator. it...

    the assembly is the constant volume regulator. it uses "calibrated springs" to regulate the constant volume at different pressures. different springs (colors) and an adjustment screw give so called...
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    7,080

    when faced with existing buensod units you...

    when faced with existing buensod units you basically have 3 choices
    1. run away fast, hopefully another contractor will lose his shirt trying to source and fix this junk.
    2. rip them out and...
  28. Thread: KMC or Alerton

    by nik99
    Replies
    7
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    1,403

    KMC has had some internal problems in the last...

    KMC has had some internal problems in the last few years. They have now more or less restructured into a controls comany instead of a component manufacturer.
    This resulted in alot of new people...
  29. Replies
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    23,410

    According to Honeywell they need to be cycled at...

    According to Honeywell they need to be cycled at least once a year. The old base mount ones from Barber Colman and honeywell were every three months.
    The new rules for hospitals call for cycling...
  30. Replies
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    1,075

    Various control panels and test switches are...

    Various control panels and test switches are available as options on the dampers. They should be specified more but rarely are.
  31. Replies
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    1,336

    Be very careful with reflectix stuff. May...

    Be very careful with reflectix stuff.
    May violate the fire code as an internal lining.
  32. Thread: What's a CV box?

    by nik99
    Replies
    5
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    7,037

    it is a VAV box with max and min set the same....

    it is a VAV box with max and min set the same.
    The important part is that it has a flow sensor to maintain a "pressure independent" constant volume. Otherwise its a balancing damper.
  33. Thread: K-factor

    by nik99
    Replies
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    7,907

    According to ASHRAE standard 130 what you are...

    According to ASHRAE standard 130 what you are calling K is actually F.

    Probably the reason for some of the confusion out there...

    amplification factor (F-Factor): ratio of sensor output to true...
  34. Replies
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    13,163

    Sounds like some of the coils are not energized...

    Sounds like some of the coils are not energized and others are picking up the slack in adjacent zones.
    Check the PE switches and calibration of those switches, also the coil relays themselves.
    The...
  35. Replies
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    13,163

    The pnuematic controls on the Reddi boxes are...

    The pnuematic controls on the Reddi boxes are likely made by KMC.
    They are very reliable, inexpensive and easy to use.
    They really should be recalibrated every 5 years for best results.
    Common...
  36. Thread: Hysteresis

    by nik99
    Replies
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    2,876

    whec720 Great link, very very usefull, thanks.

    whec720
    Great link, very very usefull, thanks.
  37. Replies
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    I suggest you put a magnehelic on the sensor and...

    I suggest you put a magnehelic on the sensor and confirm it is within range.
  38. Replies
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    1,694

    i was unfamiliar with the manufacturer you...

    i was unfamiliar with the manufacturer you listed, so i looked it up....
  39. Replies
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    2,308

    perhaps i should clarify slightly old systems...

    perhaps i should clarify slightly
    old systems will be grandfathered in as per usual, i think.
    many states, cities, GSA builings etc... will and are mandating LEED performance criteria, various...
  40. Replies
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    2,308

    most of these systems will be code violations in...

    most of these systems will be code violations in 5 years.
    welcome to the world green buildings.
    the costs and maitenance will be huge.
    bright futures await, i hope.
  41. Replies
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    2,308

    Simultaneous heating and cooling violates ASHRAE...

    Simultaneous heating and cooling violates ASHRAE 90.1.
    Not the most energy efficient concept for the new batch of green buildings.
    But it works real well and makes allot of sense in a building like...
  42. Replies
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    2,717

    Trion was just purchased by Tomkins group see...

    Trion was just purchased by Tomkins group
    see link below

    http://www.tomkins.co.uk/tomk/media/releases/2008/2008-06-20/2008-06-20.pdf?version=1
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    Where does it say that???

    Where does it say that???
  44. Replies
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    811

    I hate rules of thumb, especially in critical...

    I hate rules of thumb, especially in critical environments. They are stupid and should never be used. People can die. It is not someone just complaining that its hot or cold. Learn your business or...
  45. Replies
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    2,663

    Thanks for the help johnjohn. I appreciate an...

    Thanks for the help johnjohn.
    I appreciate an inteligent response.
    What I am actually try to do, is to fool my home alarm into thinking the phone is still hooked up, but not allow it to dial out....
  46. Replies
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    2,663

    Phone Line Color Codes

    On a standard residential 4 pin phone line. What exactly are the colors and corresponding uses and/or voltages of the wires that we should see.
  47. Replies
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    868

    Certain types of granite do release radon....

    Certain types of granite do release radon.
    Scared yet? You shouldn't be.
    Radon and anything that is radioactive (which is just about everything) harms you as the dose accumulates over time.
    It...
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    5,004

    i heard the same thing. good riddance to them.

    i heard the same thing.
    good riddance to them.
  49. Thread: Diffusers

    by nik99
    Replies
    8
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    844

    When the vav opens up??? How much air, does this...

    When the vav opens up???
    How much air, does this mean?
    Is this morning warmup or something.
    What do you have on site now.
    I strongly doubt that it is diffuser issue.
  50. Replies
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    2,247

    ASC (air system components) is the manufacturing...

    ASC (air system components) is the manufacturing subsidury of Tomkins.
    Titus, Krueger and Tutle and Bailey are just brand names.
    They are all made in the same plant, different sticker of course....
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