ICE THERMAL STORAGE TYPE AIR CONDITIONER

摘要

PROBLEM TO BE SOLVED: To provide an ice thermal storage type air conditioner and a method for operating it in which cooling and heating operation can be efficiently carried out in an indoor unit upon peak cut. SOLUTION: The ice thermal storage type air conditioner comprises an outdoor unit 10, the indoor unit 20 and a thermal storage unit 30. The thermal storage unit 30 includes a thermal storage tank 31, an expansion valve 37, a water heat exchanger 42, an accumulator 54 and a heat exchanger 32 for the thermal storage unit for performing a heat exchange between water and a refrigerant in the thermal storage tank 31. Before the start of the peak cut that the operation of the outdoor unit 10 is stopped, a refrigerant circuit in front of the inlet of the expansion valve 37 of the heat exchanger 32 of the thermal storage unit is interrupted to perform a pump-down control for discharging the refrigerant in the heat exchanger 32 for the thermal storage unit.