→ PURON® (R-410A) QUICK REFERENCE GUIDE
FOR INSTALLERS AND TECHNICIANS
• Puron (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 Puron
(R-410A).
• Puron (R-410A) refrigerant cylinders are rose colored.
• Recovery cylinder service pressure rating must be 400 psig,
DOT 4BA400 or DOT BW400.
• Puron (R-410A) systems should be charged with liquid refrig-
erant.
• Use a commercial type metering device in the manifold hose.
• Manifold sets should be at least 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.
• Puron (R-410A), as other HFC’s, 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.
• Wrap all filter driers and service valves with wet cloth when
brazing.
• A liquid-line filter drier is required on every unit.
• Indoor unit is equipped with a TXV. Replacement TXV must
be designed for Puron (R-410A).
• Do not use an R-22 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 filter driers.
• Do not vent Puron (R-410A) into the atmosphere.
• Do not use capillary tube indoor coils.
• Observe all warnings, cautions and bold text.
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