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Low side pressure readings showing low pressure can mask blockages in the system and allow overfilling of the r134a resulting in very high ... For a general reference, you can check out this chart of R-134a system pressures. If you find you've got a low pressure on the low side of your system, then ... Your high side is variable depending on outside temperature, but it should be around 150ish psi, low side should be around 30 psi. Best way to ... I would suggest finding an R134a Refrigerant Pressure Temperature Calculator on line and figuring out the proper PSI rating for your application ... Low side pressure should sit right at 30psi at all times the compressor is on, within a couple psi is OK. High side pressure will change ... Â At least twenty-five PSI of static pressure is required, or the cycle switch may disable the compressor. What is normal automotive air conditioner pressure? It seems that for the outside temperatures in the middle east, pressure gauge reading should go to 50-55. He topped it up till 35 and said it shouldn't be ... So if I'm reading the manual correctly, the correct procedure to measure refrigerant pressure is to set AC to max cold, recirc, max fan ... The AC Pressure Chart for R134a is a useful guide. It gives you typical pressure values for both the high and low sides at different temperatures. Cooling Pressure (PSI). @ Service Port. (Tolerance +/- 5). Outdoor Temp (°F). Refrigerant Pressure vs. Temperature Charts for Pioneer Split Systems (R410a). 75.