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Specifications are subject to change without notice.
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.
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.
