Slightly high LP AC reading

Discussion in 'High Tech Retrofits' started by badazz81z28, May 1, 2019.

  1. badazz81z28

    badazz81z28 Veteran Member

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    Charged my VA system...did it by weight even though every other AC pro says to use pressure. Well my low pressure side reads about 25 psi..VA wants 6-18psi...high pressure is normal at ~150. It’s about 70 degrees in the shade. AC blows colds...what does the high LP reading indicate? Too much refrigerant? Too little?
     
  2. badazz81z28

    badazz81z28 Veteran Member

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    373BD0EC-A3EB-4464-A2B6-F7ABB3452E79.png
     
  3. 75Maro

    75Maro Veteran Member

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    High side pressure seems off also.
    Where are you located.
    General rule of thumb is HS should be ambient x2 plus 40-50.
     
  4. ULTM8Z

    ULTM8Z Veteran Member

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    High side is showing 275, not 150???
     
  5. 75Maro

    75Maro Veteran Member

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    I would evacuate the system
    Pull a vacuum for 20 minutes if you didn’t already do this then pull refrigerant in through low side (suction side) until the gauges read what you want.
     
  6. badazz81z28

    badazz81z28 Veteran Member

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    The gauges have inner dials depending on what you’re mesuring. I’ll take a better picture. The second inner dial in red is R134A #s.
     
  7. badazz81z28

    badazz81z28 Veteran Member

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    51A153FA-B96E-4225-828A-C36D900F1D09.jpeg ECF472A1-0362-43C4-A79D-7265159336E7.jpeg Here you go, so when you see 250 on the outer dial R134A is ~148

    The low pressure is closer. Outer dial says 25 it’s about 29 on the R134A. Low pressure seems a little high for VA, but normal for rule of thumb. In Vegas today it was about 75 deg, but I was in my garage where it was probably closer to 70deg or slightly less.
     
  8. badazz81z28

    badazz81z28 Veteran Member

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    Static pressures are about 90 on both gauges
     
  9. Mike-78 Z-28

    Mike-78 Z-28 Veteran Member

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    Weight is the only correct way, no manufacturer ever goes by pressure. Pressure can be all over the place with whatever the temp is. Suicide cans and top offs try to go by pressure because it's just a guess if they don't know how much is left in the system.
     
  10. Mike N

    Mike N Administrator Staff Member Lifetime Gold Member

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    Looks like it's overcharged to me.
     

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