R-410A Quick Reference Guide R-410A refrigerant operates at 50-70 percent higher pressures than R-22. Ensure that the servicing equipment and replacement components used are designed to operate with R-410A R-410A refrigerant cylinders are rose colored R-410A refrigerant cylinders have a dip tube which allows liquid to flow out of the clinder in upright position. Note: Recovery cylinder service pressure rating must be 400PSIG, DOT RBA400 or DOT BW400 R-410A systems should be charged with liquid refrigerant. Use a commercial type metering device in the manifold hose Manifold sets should be 800 PSIG high side and 250 PSIG low side with 550 PSIH low side retard Use hoses with 800 PSIG service pressure rating R-410A requires a different set of gauges than those used for R-22 R-410A requires matched indoor/outdoor systems Leak detectors should be designed to detect HFC refrigerant R-410A as well as other HFC’s, is only compatible with POE oils POE absorbs moisture rapidly. Do not expose oil to atmosphere Vacuum pumps will not remove moisture from oil An R-410A listed liquid line filter drier is required on every unit Do not use liquid line filter driers with rated working pressures less than 600 PSIG Do not install a suction line filter drier in liquid line Wrap all filter driers and service valves in a wet cloth before brazing Do not use an R-22 TXV If indoor unit is equipped with an R-22 TXV, it must be changed to an R-410A TXV Never open a system to atmosphere while it is under vacuum Do not use capillary tube coils Brought to you by: HVACFun.com