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PURON® (R-410A) QUICK REFERENCE GUIDE

• Puron 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 refrigerant.

• Puron refrigerant cylinders are rose colored.

• Recovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT BW400.

• Puron refrigerant systems should be charged with liquid refrigerant. Use a commercial type metering device in the manifold hose

when charging into suction line with compressor operating

• Manifold sets should be 700 psig high side and 180 psig low side with 550 psig low-side retard.

• Use hoses with 700 psig service pressure rating.

• Leak detectors should be designed to detect HFC refrigerant.

• Puron refrigerant, as with other HFCs, 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 leave Puron refrigerant suction line filter driers in line longer than 72 hours.

• Do not install asuction-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 factory approved liquid-line filter drier is required on every unit.

• Do NOT use an R-22 TXV.

• If indoor unit is equipped with a R-22 TXV or piston metering device, it must be changed to a hard-shutoff Puron refrigerant

TXV.

• Never open system to atmosphere while it is under a vacuum.

• When system must be opened for service, recover refrigerant, evacuate then break vacuum with dry nitrogen and replace filter

driers. Evacuate to 500 microns prior to recharging.

• Do not vent Puron refrigerant into the atmosphere.

• Do not use capillary tube coils.

• Observe all warnings, cautions, and bold text.

• All indoor coils must be installed with a hard-shutoff Puron refrigerant TXV metering device.

Carrier FY5B User Manual

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