Service Manual

SERVICE AND MAINTENANCE FAN COILS

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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.

 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

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