R22 has been the dominant refrigerant in residential
and commercial air conditioning and some very
large centrifugal chillers for air conditioning and
industrial process cooling. It has also been used in
refrigeration since the phase-out of CFCs, both as a
pure refrigerant and in blends. R22 is subject to
reduced production and restriction in new
equipment since 2010, and production ends in 2020.
The use of R22 is allowed until the R22 supply has
been depleted.
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