Carrier PERFORMANCE 50VT-A Installation Instructions Manual page 29

PURONR (R- -410A) QUICK REFERENCE GUIDE
Puron refrigerant operates at 50- -70 percent higher pressures than R- -22. Be sure that servicing equipment and replacement
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components are designed to operate with Puron
Puron refrigerant cylinders are rose colored.
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Recovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT BW400.
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Puron systems should be charged with liquid refrigerant. Use a commercial type metering device in the manifold hose when
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charging into suction line with compressor operating
Manifold sets should be minimum 700 psig high side and 180 psig low side with 550 psig low- -side retard.
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Use hoses with minimum 700 psig service pressure rating.
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Leak detectors should be designed to detect HFC refrigerant.
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Puron, 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 leave Puron suction line filter driers in line longer than 72 hours.
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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 factory approved liquid- -line filter drier is required on every unit.
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Do NOT use an R- -22 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, recover refrigerant, evacuate then break vacuum with dry nitrogen and replace filter
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driers. Evacuate to 500 microns prior to recharging.
Do not vent Puron into the atmosphere.
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Observe all warnings, cautions, and bold text.
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All indoor coils must be installed with a hard shutoff Puron TXV metering device.
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