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R-410A QUICK REFERENCE GUIDE
• R-410A refrigerant operates at 50% - 70% higher pressures than R-22. Be sure that servicing equipment and
replacement components are designed to operate with R-410A.
• R-410A refrigerant cylinders are rose colored.
• Recovery cylinder service pressure rating must be 400 psig, DOT 4BA400 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 750 psig high-side and 200 psig low-side with 520 psig low-side retard.
° Use hoses with 750 psig service pressure rating.
° Leak detectors should be designed to detect HFC refrigerant.
° R-410A, as with other HFC refrigerants, is only compatible with POE oils.
° Vacuum pumps will not remove moisture from oil.
° 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.
° POE oils absorb moisture rapidly. Do not expose oil to atmosphere.
° POE oils may cause damage to certain plastics and roofing materials.
° Wrap all filter-driers and service valves with wet cloth when brazing.
° A liquid line filter-drier is required on every unit.
° Do not use with 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 system to atmosphere while it is under a vacuum.
° When system must be opened for service, break vacuum with dry nitrogen and replace all filter-driers.
° Do not vent R-410A into the atmosphere.
° Do not use capillary tube indoor coils.
° Observe all WARNINGS, CAUTIONS, NOTES, and bold text.
421 01 5103 02 Specificationssubjectto change without notice. 15
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