Results 1 to 8 of 8
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15-09-2009, 09:16 PM #1
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)
MoisesLast edited by Acrisoft; 15-09-2009 at 09:18 PM.
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15-09-2009, 09:21 PM #2
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.......
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15-09-2009, 09:24 PM #3
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Re: A/C Pressure problem - Low side too high
Rise your engine RPM and then measure pressures!
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15-09-2009, 09:36 PM #4
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.
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15-09-2009, 10:01 PM #5
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.
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15-09-2009, 11:37 PM #6
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
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16-09-2009, 09:53 AM #7
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Re: A/C Pressure problem - Low side too high
[That is normal and it tell us that ambient temperature is 40°C (105°F) if you telling us absolute pressure or 44°C (112°F) 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)?
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17-09-2009, 12:14 PM #8
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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