Refrigerant Pressure Temperature Chart Pdf. This is a 20+ psig difference and you will easily tell if you have an r290 or r22 freon. That’s only a 2.6°f difference).

That’s only a 2.6°f difference). At 100°f, however, the pressure of r22 is 195.9 psig and the pressure of r290 has a pressure of 174.3 psig (check the r290 pt chart below). This is a 20+ psig difference and you will easily tell if you have an r290 or r22 freon.