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An R22 coil will work properly with R410A only ifseveral conditions are met.

First, the manufacturer of the coil must specify that it will work with both refrigerants. R410A systems operate at about 40 to 70 % higher pressure than R22 systems.

Second, the new coil must be equipped with an inlet control (either a thermal expansion valve or orifice) that is intended for R410A. The new coil may not use a capillary tube metering system to control refrigerant flow into the evaporator coils.

Third, the tonnage, or Btu capacity, of the coil and control device, and the EER/SEER of the coil must match those same ratings for the condensing unit.

Fourth, if the new coil has been used in an R22 system, it must be thoroughly flushed clean of oil, and must be refitted with the proper control valving for R410A.

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