R-410A Quick Reference Guide - International comfort products N4A3 Series Installation Instructions Manual

INSTALLATION INSTRUCTIONS

R-410A QUICK REFERENCE GUIDE

• R-410A refrigerant operates at 50% - 70% higher pressures than R-22. Be sure that servicing equipment and
replacement components are designed to operate with R-410A.
• R-410A refrigerant cylinders are rose colored.
• Recovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT BW400.
• R-410A systems should be charged with liquid refrigerant. Use a commercial type metering device in the
manifold hose.
• Manifold sets should be 750 psig high-side and 200 psig low-side with 520 psig low-side retard.
• Use hoses with 750 psig service pressure rating.
• Leak detectors should be designed to detect HFC refrigerant.
• R-410A, as with other HFC refrigerants, is only compatible with POE oils.
• Vacuum pumps will not remove moisture from oil.
• Do not use liquid line filter-driers with rated working pressures less 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 liquid line filter-drier is required on every unit.
• Do not use with an R-22 TXV.
• If indoor unit is equipped with an R-22 TXV, it must be changed to an R-410A TXV.
• Never open system to atmosphere while it is under a vacuum.
• When system must be opened for service, break vacuum with dry nitrogen and replace all filter-driers.
• Do not vent R-410A into the atmosphere.
• Do not use capillary tube indoor coils.
• Observe all WARNINGS, CAUTIONS, NOTES, and bold text.
14
International Comfort Products, LLC
Lewisburg, TN 37091
R-410A Split System Air Conditioner
421 01 5101 00