R-410A—QUICK REFERENCE GUIDE
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R-410A refrigerant operates at 50-70 percent higher pressures than R-22. Be sure that servicing equipment and replacement
components are designed to operate with R-410A.
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R-410A refrigerant cylinders are rose colored.
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R-410A refrigerant cylinders have a dip tube which allows liquid to flow out of cylinder in upright position.
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Recovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT BW400.
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R-410A systems should be charged with liquid refrigerant. Use a commercial type metering device in the manifold hose.
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Manifold sets should be 800 psig high side and 250 psig low side with 550 psig low-side retard.
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Use hoses with 800 psig service pressure rating.
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Leak detectors should be designed to detect HFC refrigerant.
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R-410A, as with other HFCs, is only compatible with POE oils.
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Vacuum pumps will not remove moisture from oil.
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Do not use liquid-line filter driers with rated working pressures less than 600 psig.
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Do not install a suction-line filter drier in liquid line.
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POE oils absorb moisture rapidly. Do not expose oil to atmosphere.
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POE oils may cause damage to certain plastics and roofing materials.
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Wrap all filter driers and service valves with wet cloth when brazing.
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A liquid-line filter drier is required on every unit.
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Do not use an R-22 TXV.
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If indoor unit is equipped with an R-22 TXV, it must be changed to an R-410A TXV.
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Never open system to atmosphere while it is under a vacuum.
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When system must be opened for service, break vacuum with dry nitrogen prior to opening to atmosphere.
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Always replace filter drier after opening system for service.
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Do not vent R-410A into the atmosphere.
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Do not use capillary tube coils.
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Observe all warnings, cautions, and bold text.
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