Core (Universal)第 9 / 240 题
As of January 1, 2020, what happened to R-22 (HCFC-22) in the United States?
a.It was required in all new residential air conditioners
b.It was reclassified as a natural refrigerant
c.It became legal to vent it freely to the atmosphere
d.Its production and import were banned, so only recovered, recycled, or reclaimed supplies remain
解析
Beginning January 1, 2020, it became illegal to produce or import R-22 in the United States, so servicing older R-22 equipment now depends on recovered, recycled, or reclaimed supplies. Venting R-22 remains illegal, it was never a natural refrigerant, and new systems use non-ozone-depleting refrigerants. The phaseout follows the Montreal Protocol schedule for HCFCs.
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