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  1. #1
    Join Date
    Aug 2010
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    What determines the static pressure?

    or standing/still state/equalized refrigerant loop pressure of a stopped system.

    If the entire system is at uniform temperature, it will be whatever the unit is at, so if you leave a window A/C in your trunk and its at 120F, the entire hermetic system will pressurize to 264 psi or so for HCFC-22

    In the case of a split system where the condensing unit's sun baked to 120F and evaporator coil is at 90F, what can I expect the static pressure to be?

    Lowest temperature point, highest point, or something in between?

    For a package RTU in Phoenix, AZ on a 105F baked in the sun, is it unreasonable to assume it will reach 135F? (vapor pressure of R-22 is 315 psi).

    This means you can leak test any component using nitrogen at whatever R-22 vapor pressure system is expected to see under normal design parameters, no? So for a RTU package, even if you don't know the maximum permissible pressure, its ok to pressurize the system to at least 315 psi, no?

  2. #2
    Join Date
    Mar 2007
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    State of Confusion
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    1,210
    Is this a drunken post? lol

  3. #3
    Join Date
    Oct 2003
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    Washington
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    Let me answer your question:


    http://www.youtube.com/watch?v=35Lt4bIXyrY

  4. #4
    Join Date
    Jul 2010
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    25
    I wonder if the OP is the same guy that owns this pickup.
    http://hvac-talk.com/vbb/showthread.php?t=609492

  5. #5
    Join Date
    Apr 2007
    Location
    Saint Augustine, Florida, United States
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    1,155
    Measure the pressure when the system isn't running.....? Just kidding...here you go: http://www.youtube.com/watch?v=YkCXg...x=0&playnext=1

  6. #6
    Join Date
    May 2010
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    Talking

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  7. #7
    Join Date
    Sep 2007
    Location
    Newark, Ohio
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    112
    Quote Originally Posted by ICanHas View Post
    If the entire system is at uniform temperature, it will be whatever the unit is at, so if you leave a window A/C in your trunk and its at 120F, it's around 264 psi for HCFC-22


    In the case of a split system where the condensing unit's sun baked to 120F and evaporator coil is at 90F, what can I expect the static pressure to be?

    Lowest temperature point, highest point, or something in between?
    If your trying to determine the type of refrigerant in the system (or air in system) what is wrong with that question? I would like the answer also.
    He is referring to the static pressure of the refrigerant not the static pressure of the air.

  8. #8
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    68,125
    I thought it was a good question.

    The static pressure will be at or close to your outdoor temp(accuracy of gauges?). Since there will still be some liquid refrigerant in the condenser.
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  9. #9
    Join Date
    Nov 2006
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    Southeastern Pa
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    18,593
    Wouldn't that be standing pressure?
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  10. #10
    Join Date
    Jan 2009
    Location
    Indiana
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    3,228
    never thought of hooking up my manometer

  11. #11
    Join Date
    Aug 2010
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    2,839
    Quote Originally Posted by timebuilder View Post
    Wouldn't that be standing pressure?
    Oops... I may have missed a word, but when was talking about R-22 and pressure in psi instead of air in inches water, I'm sure you gys figured out what I meant.

  12. #12
    Join Date
    Jul 2010
    Location
    middle tn
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    21
    i agree with been. but what are you trying to determine with that measurement?

  13. #13
    Join Date
    Apr 2007
    Location
    Saint Augustine, Florida, United States
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    Ima smartazz

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