Refrigerant R410a Deskripsi Refrigerant R410a R-410A is currently the leading non-ozone depleting replacement for HCFC-22 in unitized air conditioning systems for residential and light commercial units. These units are refrigerant-in-tube design, meaning these units contain no vessels such as liquid receivers, condenser barrels or chiller barrels. These components typically have test pressure ratings of 350 to 400 PSI. R-410A has a significantly higher vapor pressure than R-22. The condensing pressure of R-410A at standard conditions is 336 PSI. This is slightly higher than our current high-pressure safety shut-off setting. An equivalent high pressure cut off for R-410A would be 553 PSI. This pressure far exceeds the pressure ratings of the components previously referenced. Contractors and technicians need to know that R-410A can only be used in equipment designed for R-410A. It cannot be used to retrofit existing R-22 equipment due to significantly high operating pressures. Furthermore, special service equipment is required, such as a high pressure manifold gauge set, a high-pressure recovery unit, and high pressure recovery tanks .