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  1. Thread: Direct fired

    by drrtu
    Replies
    7
    Views
    789

    I would use, Z83.4 - CO less than 5.0 ppm, NO2...

    I would use, Z83.4 - CO less than 5.0 ppm, NO2 less than 0.5 ppm, and CO2 less than 4,000 ppm & Z83.18 - CO less than 25 ppm, NO2 less than 3 ppm, and CO2 less than 5,000 ppm based upon review of...
  2. Thread: Direct fired

    by drrtu
    Replies
    7
    Views
    789

    The limits will depend on the application. Try...

    The limits will depend on the application. Try http://www.absolutaire.com/eng_resources.vml they have a few docs publiished.
  3. Thread: Direct fired

    by drrtu
    Replies
    7
    Views
    789

    The major ones are: ANSI Standard Z83.4,...

    The major ones are:
    ANSI Standard Z83.4, Non-Recirculating Direct Gas-Fired Industrial Air Heaters. ANSI Standard Z83.4 is the primary equipment standard for 100-percent outside-air direct gas-fired...
  4. Replies
    8
    Views
    1,252

    If the system is VAV not VVT, then your box...

    If the system is VAV not VVT, then your box selection should be correct. Most designers look at a velocity to the terminal at 1500 to 1800fpm. I would say the box /inlet size is correct for the flow....
  5. Replies
    8
    Views
    1,437

    Rapid and Weather-Rite are the same company with...

    Rapid and Weather-Rite are the same company with similar products. Both were acquired by Roberts-Gordon. Look at the Rapid 2000 vs. Weather-Rite XT.
  6. Automotive antifreeze products typically contain...

    Automotive antifreeze products typically contain silicate-based corrosion inhibitors. These fluid & inhibitors have been designed protect aluminum. In a boiler /chiller systems, flow tends to be less...
  7. Replies
    8
    Views
    1,437

    Most of my work is D/B and I like to use...

    Most of my work is D/B and I like to use Engineered Air. The products are an excellent value and the product line is very wide. I have applied both 80/20 units and indirect fired air rotation....
  8. Thread: Helium?

    by drrtu
    Replies
    9
    Views
    888

    Helium is an excellent leak detection means. It...

    Helium is an excellent leak detection means. It will not react with the materials we normally see based upon normal HVAC operating pressures and temperatures. The cost of the testing equipment is the...
  9. Replies
    17
    Views
    2,440

    Why do you want to run the economizer on space...

    Why do you want to run the economizer on space pressure? It sounds like you are trying to fix a poor design by cutting off economizer operation. Depending on the size of the RTU, an accessory power...
  10. Stratification is your friend not your enemy in...

    Stratification is your friend not your enemy in UFAD you need a high RAT. In my current UFAD, I designed two evaporated cooled VAV rooftops at 220 tons each (53 F LAT) that feed 16 12,000 cfm air...
  11. Carnak, I agree with the numbers you have...

    Carnak, I agree with the numbers you have presented on ongthiamguan's design. I would push for a non-bypass design (low LAT). I prefer a VAV system connected to air columns to do the mixing for the...
  12. Yes I did sir. I am starting the commissioning of...

    Yes I did sir. I am starting the commissioning of my 120,000 sq/ft under floor system this month.
  13. Start working with the floor designer very early...

    Start working with the floor designer very early in this project. I have never seen a raised stadium floor design. I would be concerned about elevation changes and the effect of the lower mixing zone...
  14. Replies
    25
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    3,494

    I agree with others, side wall venting is allowed...

    I agree with others, side wall venting is allowed in when working to Cook County. Please tell us the page / paragraph that you are quoting. Did you have an inspector that was enforcing his own...
  15. Replies
    15
    Views
    2,264

    I have a complete unit that I took out of sevice...

    I have a complete unit that I took out of sevice 5 years ago that you can have at cheap price Model # BU067A-ASM Serial # 358896-001 460v 3 phase. Outdoor Unit = Model # CSF083LZ Serial # 98070604...
  16. Thread: Sub-meter

    by drrtu
    Replies
    14
    Views
    1,306

    Opcarriage, send me an email (address in public...

    Opcarriage, send me an email (address in public profile) to discuss local installatations.
    Steve
  17. Replies
    12
    Views
    757

    Hire a consulting engineer to develop a complete...

    Hire a consulting engineer to develop a complete permitable plan. This way you control the work scope and pricing. The engineer will specify the tonnage. A good consultant will give you ball park...
  18. Replies
    4
    Views
    527

    Check with the AHJ re: which local code /...

    Check with the AHJ re: which local code / standard the municipality works to. Outside Chicago we have a lot still working to 2001. I just turned in a permit and the village had us working to IMC...
  19. Replies
    20
    Views
    1,670

    Is each twin being controlled via each microTech...

    Is each twin being controlled via each microTech without an automation system? Just to make sure, are the wait and step times the same between the hunting and non-hunting return fans? Is the return...
  20. Replies
    27
    Views
    1,955

    Bby From your last post, it sound like a...

    Bby
    From your last post, it sound like a simplity setting not the ems.
  21. Replies
    27
    Views
    1,955

    The service company should send a tech with a...

    The service company should send a tech with a pocket pc or a pc with the simplicity software. All new York RTUs have the simplicity board. The blinking light is the simplicity board status. The...
  22. Replies
    13
    Views
    800

    Flyrfan I have seen numerous failures of light...

    Flyrfan
    I have seen numerous failures of light commercial systems that would log oil due to hot gas at the ACCU. The systems were not set up correctly or they tried to HG a large % of capacity. I at...
  23. Replies
    13
    Views
    800

    I agree, add a Rawal at the accu and only use TXV...

    I agree, add a Rawal at the accu and only use TXV at the coil. Talk to Richard Rawal his dad came up with the device. HGBP will cook the pump. If you want HGBP route it to the distributor to false...
  24. Replies
    15
    Views
    1,030

    Nailor make a wide range of OR grilles....

    Nailor make a wide range of OR grilles. http://www.nailor.com/onlinecatalogs/HospitalCleanRoom/HCRDCAT.pdf
  25. Replies
    13
    Views
    800

    I did a linear optical scale manufacture...

    I did a linear optical scale manufacture calibration room and they were also very cheap. The room was 20x30 all interior walls in a conditioned warehouse. Internal loads inside the space did not...
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