Carrier Japan Corporation

Toshiba Carrier Corporation

Tetsuma Hamashima

Ken Miura

Masatsugu Yamamoto

Tomoki Shimizu

Katsuhiro Shimizu

An air conditioner includes an indoor unit, an outdoor unit, and a controller. The controller of an air conditioner switches between a first defrosting drive to defrost a first outdoor heat exchanger and a second outdoor heat exchanger at the same time, and a second defrosting drive to defrost the first outdoor heat exchanger after the start of defrosting of the second outdoor heat exchanger; estimates a refrigerant residue amount of the first outdoor heat exchanger and a refrigerant residue amount of the second outdoor heat exchanger; and adjusts an opening degree of the first expansion valve and an opening degree of the second expansion valve, based on the refrigerant residue amount of the first outdoor heat exchanger and the refrigerant residue amount of the second outdoor heat exchanger.

Air conditioner that defrosts outdoor heat exchanger based on refrigerant residue amount of outdoor heat exchanger

An air conditioner of an embodiment includes a plurality of outdoor units, one or more indoor units, and a control unit. The outdoor unit includes a compressor, a four-way valve, an outdoor heat exchanger, an outdoor expansion valve and an outdoor blower, and the outdoor units exchange heat between the outside air and a refrigerant. The indoor unit is an indoor unit connected to the plurality of outdoor units by a refrigerant pipe, includes an indoor heat exchanger, an indoor expansion valve, and an indoor blower, and exchanges heat between the indoor air and the refrigerant. The control unit controls the plurality of outdoor units and the one or more indoor units. The control unit controls the condensation pressure of the outdoor unit in a heating operation or the suction pressure of the outdoor unit in a defrosting operation to be equal to or smaller than an upper limit pressure, which is 1/1.5 times the rated maximum pressure during the heating operation when any of the outdoor units is in the defrosting operation.

Growing community of inventors

Fuji, Japan

Tetsuma Hamashima