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APPENDIX A
AIR CONDITIONER AND HEAT PUMP
—
WITH R- - 410A
QUICK REFERENCE
GUIDE
S 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 R-410A.
S R-410A refrigerant cylinders are rose colored.
S Recovery cylinder service pressure rating must be 400
psig, DOT 4BA400 or DOT BW400.
S R-410A 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 R-410A, 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.
44
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.
S A 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 R-410A 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 R-410A into the atmosphere.
S Do not use capillary tube coils.
S Observe all warnings, cautions, and bold text.
S All R- - 410A heat pumps must have indoor TXV.
S Do not leave R-410A suction line driers in place for
more than 72 hours.
Specifications are subject to change without notice.
506 01 2303 01
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