Many air conditioning systems incorporate an HFC refrigerant as the standard. It is extremely importantfor the HVAC technician to understand the propertiesof these refrigerants. If proper service practices arenot followed severe system damage will result.The Air Conditioning market is converting to the new,environmentally friendly refrigerant, R-410A, with thephase-out of R-22 in 2010. R-410A will represent onethird of the market in 2006, in conjunction with thenew higher efficiency regulation of 13 SEER. Since R-410A is classified as an HFC, the only recom-mended oil is polyol ester (POE) oil. POE oil is extremely hygroscopic and will absorb moisture at a rapid rate. Testing has shown that POE oil can bemoisture saturated in less then 15 minutes if exposedto a 90% relative humidity environment.R410A = R125 + R32 Boiling Point = -51. 6Standing pressure = 250psiSuction Pressure = 110psiDischarge Pressure = 500psi*All of above pressures are changes with atmosphere temperature