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Type: Posts; User: xrqp

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  1. Replies
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    ckartson, thanks for your input. At first I...

    ckartson, thanks for your input. At first I thought I could change the valve to the right size, but maybe I cannot as described below. The problem I am describing below makes your idea very...
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    I did not mention it, but I agree - we need, and...

    I did not mention it, but I agree - we need, and we have, a separate high limit safety. The proposed dewpoint sensor in the supply duct would be in addition to the high limit. (About one in five of...
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    Thanks Cagey57 and meplumber. Yes the control...

    Thanks Cagey57 and meplumber. Yes the control valves were oversized. They were 4.8Cv. One of our rooms only need a .63 Cv and we just installed a .73Cv on that room and it has helped.
    It is most...
  4. Sticky: I also am ME from UCSB. Except I am a grey beard...

    I also am ME from UCSB. Except I am a grey beard - graduated 1974. Did solar hot water design build contracting and sales for 10 years, sold commercial HVAC equipment for 4 years, then designed...
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    In california, for computer rooms, economizers...

    In california, for computer rooms, economizers with 100% OA capability have become popular.
    Does yours have economizer function?
    Is the economizer integrated type?
    If not, does it reduce the air...
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    Maybe you have phase imbalance on your source 480...

    Maybe you have phase imbalance on your source 480 volt 3 phase. Does one leg of 277v goes to one fan, and a different leg sends 277 to the other fan. Check the voltage on each.
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    I agree with enb54. I am skeptical. Does it...

    I agree with enb54. I am skeptical.

    Does it use fine filtration, like high MERV or HEPA?
    Does it use carbon or a similar adsorption material?
    Does it use electrostatic particlulate...
  8. Thread: Studio duct work

    by xrqp
    Replies
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    1,034

    I agree with the suggestions from flange, dlove,...

    I agree with the suggestions from flange, dlove, and jimj .

    Don't forget to also consider the noise from fans and compressors. Large systems use different design approach than a small system. ...
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    low ambient option

    check with Trane to see if they have a "low ambient option" you can retrofit. They stop the condenser fans.

    Elsewhere on this site a person named "Lambo" wrote:
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    1,687

    Why would it by 5%? Seems high to me, but I do...

    Why would it by 5%? Seems high to me, but I do not know the situation. Is there something in there besides switch gear?
  11. Replies
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    I thought the rule was you had to be a Pro to...

    I thought the rule was you had to be a Pro to reply, but not to start a thread asking for help.
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    Be more concerned about if they help you to learn...

    Be more concerned about if they help you to learn more on the job (knowledge) and teach you how to get er done (performance). Then you become more valuable regardless of the pay at the moment. ...
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    1,687

    I think that calculator link is for enclosures...

    I think that calculator link is for enclosures with no natural convection (no vent openings anywhere). JAYats, what kind of enclosure is it? vented or not?
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    humidity control for hospital surgery room

    Our criteria is minimum 30% RH and max 60% RH. We let the doctor change the room temperature any where from 65F to 78F (which I think makes it trickier).

    Air changes per hour is pretty high -...
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    Does the cabinet sujpplier say anything on this?...

    Does the cabinet sujpplier say anything on this?
    When they say "External ambient temp max of 125 deg F.. internal ambient temp max of 95 deg F." I would think that means that it will stay under 95F...
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    I think you may have a plenum fan with air foil...

    I think you may have a plenum fan with air foil or backward inclined wheel. If so, then hvac69 may be right - it may be running backwards.
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    test

    test
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    I have MicroFlo II manual. I need Microzone II manual

    I have MicroFlo II programmer's manual. I need Microzone II programmer's manual. Maybe someone could trade with me, or just provide the one I need?

    We are having trouble with controlling the...
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