Grand Aire WCH54 Series, Installation Instructions Manual, Page: 17 / 17

INSTALLATION INSTRUCTIONS R − 410A Split System Heat Pump
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Specifications subject to change without notice.
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.
Copyright 2013 International Comfort Products
Lewisburg, TN 37091 USA