R−410A Quick Reference Guide - International comfort products FEM4 Service And Maintenance Instructions

SERVICE AND MAINTENANCE
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.
 POE oils absorb moisture rapidly. Do not expose oil to atmosphere.
 POE oils may cause damage to certain plastics and roofing materials.
 Vacuum pumps will not remove moisture from oil.
 A liquid line filter−drier is required on every unit.
 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.
 Wrap all filter−driers and service valves with wet cloth when brazing.
 Do not use capillary tube indoor coils.
 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.
 Observe all warnings, cautions, notes and bold text.
 Do not use R−22 TXV
496 08 8001 00
Copyright 2014 International Comfort Products
Lewisburg, TN 37091 USA
Specifications subject to change without notice.
FAN COILS
27