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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.