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Thread: R-410-A

  1. #1

    Hmm

    I've been in TX[rio grande valley] most of time there r-22 is still very commonly used in most new installs,im in MICH now what should the "normal operateing p.s.i' be on r-410-a s central a/c system be,for low and high side's,175low,375high?????

  2. #2
    Join Date
    Apr 2003
    Location
    Iowa
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    763
    what temp outside are ya dealing with?
    where did ya get these pressures? out of your head or off a unit?

    [Edited by airconman on 01-31-2005 at 10:47 AM]

  3. #3

    r-410-a

    say an outdoor are temp of 90deg F

  4. #4

    r-410-a

    say an outdoor are temp of 90deg F,just got temp off the top of my head

  5. #5
    Join Date
    Apr 2003
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    Iowa
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    ok low side sounds a little high and the high is a little low...

  6. #6
    Join Date
    Sep 2004
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    3,157
    willie my boy.
    is this the first time using r-410-a? you know you have to consider the altitude difference between Mich and texas.

    You did say mich like in Michigan right? because it mite be a few more days untill you get 90 degrees in michigan, now Mexico could be 90 degrees but their at a lower altitude than texas.

    BTW you are going to hurt yourself and anyone that is near by if you continue with this installation, so this time you may want to think about finding someone with a 410a cert before you blow that unit and anything that is attached to it - up

  7. #7

    Hmm but what are the correct psi

    whta should the correct psi be for r-410-a with a ambient temp of 90 deg,i do know r-410-a is very,very absobent of moistuir,so i think nitrogen after a coil removel and a doubel evac,should keep the system moistuer free[new dreier's of course,high & low]what should the working psi be for a 90 deg day be

  8. #8
    Join Date
    Apr 2004
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    7,680
    The saturation temperatures are the same as R-22. Convert the pressures from a PT chart.
    You cant troublshoot or evaluate any system by pressures alone.

  9. #9
    Join Date
    Oct 2004
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    3,400
    Originally posted by ct2
    willie my boy.
    is this the first time using r-410-a? you know you have to consider the altitude difference between Mich and texas.

    You did say mich like in Michigan right? because it mite be a few more days untill you get 90 degrees in michigan, now Mexico could be 90 degrees but their at a lower altitude than texas.

    BTW you are going to hurt yourself and anyone that is near by if you continue with this installation, so this time you may want to think about finding someone with a 410a cert before you blow that unit and anything that is attached to it - up
    Did you mean latitude instead of altitude?

    Altitude is how far from the surface of the earth toward space. Detroit is 581 feet above sea level. The Rio Grande valley is at least sea level, with some parts above 5000 ft.

    LATITUDE is how far north/south.

  10. #10

    Red face bwal2

    i couldnt have said it better my self bwal2,i realy think some guy's look realy bad when they try to make them self's look real smart[duh]

  11. #11
    Join Date
    Oct 2004
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    3,400

    Re: bwal2

    Originally posted by williesanchez69
    i couldnt have said it better my self bwal2,i realy think some guy's look realy bad when they try to make them self's look real smart[duh]
    Let's not beat him up too badly.
    He's at least willing to take a stab at it.

    You really do need to take a strong look at temperatures, instead of pressures.
    Pressures are chosen strictly based on the need for a certain temperature.
    Whatever that temperature is for r-22 will be the same for 410a, 134a, 404a, 717, and r-whatever comes along that hasn't been thought of yet.

    You DO know why a particular pair of numbers is acceptable for r-22, don't you?

    Look into getting 410a certified by the manufacturer of the equipment you service.
    If you are not a servicing dealer, or work for one, try the ESCO version.
    It beats the heck out of nothing.
    It won't hurt, and it is not expensive.

    Using 410a requires nothing more than good basic refrigeration skills, that you should already be practicing.

    Don't be afraid to learn.
    Smart pays more.



    [Edited by bwal2 on 02-02-2005 at 12:37 PM]

  12. #12
    Join Date
    Dec 2004
    Posts
    201
    superheat or subcooling, what do you mean "what should the pressure be when its 90 out". What are your temps and humidity levels in the house? Altitude, Latitude, what the heck does that matter?

  13. #13
    Join Date
    Jun 2003
    Location
    GA
    Posts
    395

    Hmm ??

    Why does anybody reference pressure for any refrigerant, ever?

    It's the saturation temps that are relevant to heat exchange and refrigerant condition...super-heat, sub-cooling, ATD (a.k.a. split)! I have never thought in terms of pressure unless computing absolute compression ratio.

    I guess that's just what happens when you learn how it works before you start playing with gauges.

    md

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