Carrier 38AUZ User Manual download pdf (Page 25)

APPENDIX

AIR CONDITIONER AND HEAT PUMP WITH

PURON

— QUICK REFERENCE GUIDE

•Puron

(R-410A) refrigerant operates at 50 percent to

70 percent higher pressures than R-22. Be sure that

servicing equipment and replacement components are

designed to operate with Puron

•Puron

refrigerant cylinders are rose colored.

• Recovery cylinder service pressure rating must be 400

psig, DOT 4BA400 or DOT BW400.

•Puron

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

refirgerant.

•Puron

, as with other HFCs, is only compatible with

POE oils.

• Vacuum pumps will not remove moisture from oil.

• Use only factory specified liquid-line filter driers with

rated working pressures greater 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 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 TXV, it must be

changed to a Puron

TXV.

• Never open system to atmosphere while it is under a

vacuum.

• When system must be opened for service, recover

refrigerant, break vacuum with dry nitrogen before

opening system.

• Always replace filter drier after opening system for

service.

• Do not vent Puron

into the atmosphere.

• Do not use capillary tube coils.

• Observe all warnings, cautions, and bold text.

•All Puron

heat pumps must have indoor TXV.

• Do not leave Puron

suction line driers in place for

more than 72 hours.

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Carrier 38AUZ User Manual Page 25

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