Variable refrigerant flow system

Variable refrigerant flow (VRF) system means a multi-split system with at least three compressor capacity stages, distributing refrigerant through a piping network to multiple indoor blower coil units each capable of individual zone temperature control, through proprietary zone temperature control devices and a common communications network. Note: Single-phase VRF systems less than 65,000 Btu/h are central air conditioners and central air conditioning heat pumps.

Source

10 CFR § M_to_subpart_B_of_part_430

Scoping language

Prior to January 1, 2023, if using the appendix M test procedure for representations, including compliance certifications, with respect to the energy use, power, or efficiency of central air conditioners and central air conditioning heat pumps, any such representations must be based on the results of testing pursuant to either this appendix or the procedures in appendix M as it appeared at 10 CFR part 430, subpart B, in the 10 CFR parts 200 to 499 edition revised as of January 1, 2022. Any representations made with respect to the energy use or efficiency of such central air conditioners and central air conditioning heat pumps must be in accordance with whichever version is selected. Any representations, including compliance certifications, made with respect to the energy use, power, or efficiency of central air conditioners and central air conditioning heat pumps made on or after January 1, 2023, must be based on the results of testing pursuant the procedures in appendix M1 to this subpart.