Carrier 38AU appendix Appendix a, Appendix B, Wiring Diagram List

38AU

APPENDIX A

Air Conditioner & Heat Pump with PURON→

—Quick Reference Guide

S 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→.

S Puron→ refrigerant cylinders are rose colored.

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

S 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.

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

S Use hoses with 700 psig service pressure rating.

S Leak detectors should be designed to detect HFC refrigerant.

S Puron→, as with other HFCs, is only compatible with POE oils.

S Vacuum pumps will not remove moisture from oil.

S Use only factory specified liquid-line filter driers with rated working pressures greater than 600 psig.

S Do not install a suction-line filter drier in liquid-line.

S POE oils absorb moisture rapidly. Do not expose oil to atmosphere.

S POE oils may cause damage to certain plastics and roofing materials.

S Wrap all filter driers and service valves with wet cloth when brazing.

SA factory approved, liquid-line filter drier is required on every unit.

S Do not use an R-22 TXV.

S If indoor unit is equipped with a TXV, it must be changed to a Puron→ TXV.

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

S When system must be opened for service, recover refrigerant, break vacuum with dry nitrogen before opening system.

S Always replace filter drier after opening system for service.

S Do not vent Puron→ into the atmosphere. S Do not use capillary tube coils.

S Observe all warnings, cautions, and bold text. S All Puron→ heat pumps must have indoor TXV.

S Do not leave Puron→ suction line driers in place for more than 72 hours.

APPENDIX B

Wiring Diagram List

Unit	Electrical Characteristics	Diagram Number
38AUD*16	208/230-3-60	38AU500540
	460-3-60	38AU500541
	575-3-60	38AU500542
38AUD*25	208/230-3-60	38AU500565
	460-3-60	38AU500566
	575-3-60	38AU500567
38AUZ*16	208/230-3-60	38AU500537
	460-3-60	38AU500538
	575-3-60	38AU500539
38AUZ*25	208/230-3-60	38AU500568
	460-3-60	38AU500569
	575-3-60	38AU500570

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