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  1. Thanks guys, I have a few things to try. My ahu's...

    Thanks guys, I have a few things to try. My ahu's are probably over 150' away.
  2. That would require, at times, for the slave...

    That would require, at times, for the slave machine to use the lead machines control power. That is unacceptable. The control powe cannot be shared under any circumstances, I need to maintain the...
  3. Need 2 AHU's to share a pressure transducer

    I have two large air handlers that share a common duct system. Supply Fan vfd's maintain a static pressure in the supply duct. Each machine has its own separate pressure transducer. Because it is...
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    I see why I'm a little confused. You are stating...

    I see why I'm a little confused. You are stating data from the horizontal supply chart. This is a vertical discharge instalation
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    .93" with filters .98" without.

    .93" with filters .98" without.
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    Here are the fan performance notes. Sorry about...

    Here are the fan performance notes.
    Sorry about the lack of spaces, don't know why it pasted like that.
    General fan performance notes:
    1.Interpolation is permissible. Do not extrapolate....
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    I did not, 2.35 hp for this three phase motor.

    I did not, 2.35 hp for this three phase motor.
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    Well, considering the lip around the return box...

    Well, considering the lip around the return box bottom on the RTU is .5", a small decrease in return static to say .35", would preventing water from scaling the lup into my return.

    The chart I...
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    Could a vortex be sustained through an evaporator...

    Could a vortex be sustained through an evaporator coil? Seems impossible.
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    Are you saying a vortex would increase my sp?...

    Are you saying a vortex would increase my sp? Awesome.
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    According to install manual, the maximum return...

    According to install manual, the maximum return static "shall not exceed" .35" , I'm at .6". Due to configuration the return drop cannot be increased, beam and roof truss in the way. Anyone ever put...
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    Medium static option.

    Medium static option.
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    I don't see where you extrapolated that data. Is...

    I don't see where you extrapolated that data. Is it off the performance chart I gave you?
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    Amp draw of 2.2. Which is 1.35 hp I believe. So...

    Amp draw of 2.2. Which is 1.35 hp I believe. So 1270 x 1.35 hp is 1714.5? 342 cfm?
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    Still not real clear on what maximum external...

    Still not real clear on what maximum external static pressure is. For this unit it says that MESP is 1". However, the fan performance chart that I posted for this exact unit indicates the ability to...
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    http://i849.photobucket.com/albums/ab53/loats/Mobi...

    http://i849.photobucket.com/albums/ab53/loats/Mobile%20Uploads/20140917_102510_zps353fd540.jpg...
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    Did i do this right? ...

    Did i do this right?

    http://i849.photobucket.com/albums/ab53/loats/Mobile%20Uploads/20140917_102510_zps353fd540.jpg

    ...
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    Here are my goals for today. Determine CFM...

    Here are my goals for today.

    Determine CFM using tesp and fan data.
    Determine if rpm is constant in regard to changing static pressure.
    Measure static pressure through duct and determine where...
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    My total difference is 1"

    My total difference is 1"
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    Carrier M# 48TCEA06A2A6A0A0A0 The filter rack...

    Carrier
    M# 48TCEA06A2A6A0A0A0

    The filter rack is on coil.
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    I'm trying to determine if I actually have a...

    I'm trying to determine if I actually have a restriction issue via inadequate ductwork or if esp is within range and I just need to do a better job of sealing the economizer package and other voids.
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    There is no fire damper. I have a total esp of...

    There is no fire damper. I have a total esp of just over 1", that seems high but according to the Max esp the unit should still deliver the appropriate cfm. That doesn't solve the issue of sucking...
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    Maybe I'm interpreting the chart incorrectly. I...

    Maybe I'm interpreting the chart incorrectly. I am actually going to pick up a photo tachometer. I am really curious to see the practial application of this fan curve.

    Another question. Maximum...
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    Then why does the fan data for that specific unit...

    Then why does the fan data for that specific unit give me different cfm values at certain static pressure at different rpm values? According to the data, if the static pressure changes so does the...
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    When I compare the esp to similar systems in the...

    When I compare the esp to similar systems in the same space I find this unit almost triple that of the others. I have a problem that is causing the unit to draw in rainwater. I believe if the return...
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