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  1. #1
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    A/C Pressure problem - Low side too high


    Hi

    The a/c system was evacuated and added R134

    Low pressure side 70PSI ( too high) and high pressure side 140PSI (too low)

    Can it be excessive refrigerant load ?

    Compressor is running all time (non-stop)



    Moises
    Last edited by Acrisoft; 15-09-2009 at 09:18 PM.



  2. #2
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    Re: A/C Pressure problem - Low side too high

    I assume your talking about car A/C and it sounds very much like your compressor is not pumping.......

  3. #3
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    Re: A/C Pressure problem - Low side too high

    Rise your engine RPM and then measure pressures!
    Now, when I am officialy citizen off EU, I am looking for decent job! For any job offer please check my profile!

  4. #4
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    Re: A/C Pressure problem - Low side too high

    You have to take into consideration that he is in Brazil which is about 30C ambient, and with a suction pressure of 70 PSI I would expect a discharge pressure well in excess of 140 PSI.

  5. #5
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    Re: A/C Pressure problem - Low side too high

    If you are talking about car ac system i would say that if everything is normal the suction pressure should not exceed 35 psi in the start up and will get lower when the temp. Is getting down or the the speed of the compressor is getting high. The said pressure means that the compressor is not pumping.

  6. #6
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    Re: A/C Pressure problem - Low side too high

    Yes, it`s aumotive system
    I contacted him now and he said when he turns the compressor off, the low side goes to
    about 150PSI and also high side 150PSI

    Sorry for inaccurate information, and thanks in advance for efforts. I am not specialist, just a mechatronics teacher trying to assist my student which is far away from me




  7. #7
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    Re: A/C Pressure problem - Low side too high

    [
    Quote Originally Posted by Acrisoft View Post
    Yes, it`s aumotive system
    I contacted him now and he said when he turns the compressor off, the low side goes to
    about 150PSI and also high side 150PSI
    That is normal and it tell us that ambient temperature is 40C (105F) if you telling us absolute pressure or 44C (112F) if you giving us relative pressure.
    What pressure you are giving to us, relative (gauge with -15,4psig at low end) or absolute (gauge with 0 psia at low end)?
    Now, when I am officialy citizen off EU, I am looking for decent job! For any job offer please check my profile!

  8. #8
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    Re: A/C Pressure problem - Low side too high

    Thanks

    Problem was really the compressor

    Temperature is 25C to 27C and pressure gaugue not sure. Maybe more common type

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