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  1. #14
    Join Date
    Sep 2007
    Location
    Hinesville,GA
    Posts
    44

    Question system design pressure

    OK, i have the blower data from the unit,but it is labeled as follows cooling only units nominal air flow- I/s=1,500 it is also saying that m3/s =1.5
    on heat pumps evaporator motor I/s=1,500 and Pa=79-255
    can anyone explain these specs how do i find my design pressure using this info oh yes these are Hitachi units
    I/s stands for ?
    Pa stands for?
    m3/s stands for?

  2. #15
    Join Date
    Dec 2007
    Location
    oregon
    Posts
    885
    have your supplier e-mail you the cut sheet for your units. Can you post them for us?
    Genius = The guy who can do anything...except make a living!

  3. #16
    Join Date
    Sep 2007
    Location
    Hinesville,GA
    Posts
    44

    system design pressure specs

    here you go, sir.

  4. #17
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,308
    Metric.
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    How many times must one fix something before it is fixed?

  5. #18
    Join Date
    Apr 2007
    Location
    Dallas TX
    Posts
    192
    m3/s -- cubic meters per second
    Pa -- Pascals (pressure) there are 249.1 Pa per inch of water (a.k.a water column, writen as wc")
    I/s ?? is that 'l' lower case "L"? (Liter) per second

    my math is very rusty ... ?
    Pa 79-255 = 0.32-1.02 wc"
    1.5 m3/s = 20505 cfm or 2050.5 (5 ton) ?

  6. #19
    Join Date
    Sep 2007
    Location
    Hinesville,GA
    Posts
    44

    system design pressure

    Quote Originally Posted by airprep View Post
    OK, i have the blower data from the unit,but it is labeled as follows cooling only units nominal air flow- I/s=1,500 it is also saying that m3/s =1.5
    on heat pumps evaporator motor I/s=1,500 and Pa=79-255
    can anyone explain these specs how do i find my design pressure using this info oh yes these are Hitachi units
    I/s stands for ?
    Pa stands for?
    m3/s stands for?
    what are the proper equations for turning them form metric to american standard, if you do not mind.

  7. #20
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,308
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    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  8. #21
    Join Date
    Dec 2007
    Posts
    89
    u need 2 instruments to measure air pressure and the velocity, a water manometer for presure and a velometer for velocity inside the ducts.

  9. #22
    Join Date
    Apr 2007
    Location
    Dallas TX
    Posts
    192
    I have a new bookmark! thanks beenthere.

  10. #23
    Join Date
    Sep 2007
    Location
    Hinesville,GA
    Posts
    44

    system design pressure

    Digital dutch helped out now i just have to find the toal pressure drops for all of the diffusers coil and filter and then i can find my design pressure, right?

  11. #24
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,308
    The prussure drop of the longest run supply and return. Coil, and filter.
    Then you'll have your ASP(available static pressure), and can size your duct drom there.
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