ICP EDM Series - Page 9

START-UP PROCEDURE
Refer to outdoor unit Installation Instructions for
refrigeration system start-up instructions and refrigerant
charging method details.
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 coils absorb moisture rapidly. Do not expose oil to atmosphere.
* POE coils 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 with an R-22 TXV.
¢ [f indoor unit is equipped with an R-22 TXV, it must be changed to an R-410A TXV.
¢« 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.
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