INSTALLATION INSTRUCTIONS
R−410A, Two−Stage Split System Air Conditioner
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R−410A QUICK REFERENCE GUIDE
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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.
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R−410A refrigerant cylinders are rose colored.
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Recovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT BW400.
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R−410A systems should be charged with liquid refrigerant. Use a commercial type metering device in the
manifold hose.
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Manifold sets should be 750 psig high−side and 200 psig low−side with 520 psig low−side retard.
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Use hoses with 750 psig service pressure rating.
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Leak detectors should be designed to detect HFC refrigerant.
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R−410A, as with other HFC refrigerants, is only compatible with POE oils.
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Vacuum pumps will not remove moisture from oil.
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Do not use liquid line filter−driers with rated working pressures less than 600 psig.
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Do not install a suction line filter−drier in liquid line.
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POE oils absorb moisture rapidly. Do not expose oil to atmosphere.
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POE oils may cause damage to certain plastics and roofing materials.
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Wrap all filter−driers and service valves with wet cloth when brazing.
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A liquid line filter−drier is required on every unit.
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Do not use with an R−22 TXV.
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If indoor unit is equipped with an R−22 TXV, it must be changed to an R−410A TXV.
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Never open system to atmosphere while it is under a vacuum.
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When system must be opened for service, break vacuum with dry nitrogen and replace all filter−driers.
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Do not vent R−410A into the atmosphere.
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Do not use capillary tube indoor coils.
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Observe all WARNINGS, CAUTIONS, NOTES, and bold text.
International Comfort Products, LLC
Lewisburg, TN 37091 USA
