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See Chinese contents: GB 21454-2021 GB 21454-2021: Minimum allowable values of the energy efficiency and energy efficiency grades for multi-connected air-condition (heat pump) units
This document specifies the energy efficiency grades, minimum allowable values of energy efficiency and test methods for multi-connected air-condition (heat pump) units and low ambient temperature air source multi-connected heat pump (air conditioning) units, as well as requirements for the implementation of the Standard.
