Mitsubishi Electric Corporation

Takeshi Kuramochi

Kazunori Korenaga

Shinichi Wakamoto

Fumitake Unezaki

Hitoshi Iijima

Hirofumi Horiuchi

Yoshio Yajima

In an air-conditioning apparatus equipped with an outdoor unit having outdoor devices including a compressor that compresses a refrigerant, a flow switching valve that switches the flowing direction of the refrigerant, an outdoor heat exchanger that exchanges heat between the refrigerant and outdoor air, a first expansion valve that reduces the pressure of the refrigerant, an excess-refrigerant container that retains an excess refrigerant of the refrigerant, and a second expansion valve that reduces the pressure of the refrigerant; and an indoor unit having an indoor heat exchanger that exchanges heat between the refrigerant and indoor air, the air-conditioning apparatus includes an outdoor-heat-exchanger refrigerant injection port provided in a refrigerant pipe that is directly connected to the outdoor heat exchanger, and an excess-refrigerant-container refrigerant injection port provided in a refrigerant pipe that is directly connected to the excess-refrigerant container.

Air-conditioning apparatus

A refrigeration cycle devicewhere a combustible refrigerant circulates includes a bypass pipethat is connected so that part of the refrigerant that flows through a circulation pipe extending from a condenserto a flow control valvebypasses the flow control valveand an evaporator; a bypass flow control valvethat controls the amount of the refrigerant flowing through the bypass pipe; a heat exchangerthat allows heat exchange between the refrigerant that flows through the bypass pipeafter flowing out of the bypass flow control valveand the refrigerant that flows through the circulation pipe after flowing out of the condenser; and a subcooling degree sensor Tthat detects the subcooling degree of the refrigerant at the inlet of the flow control valve. At least either the flow control valveor the bypass flow control valveis controlled so that the subcooling degree of the refrigerant at the inlet of the flow control valveis equal to or greater than or a predetermined value.

Refrigeration cycle device and method of controlling the same

This invention relates to a multi-room air conditioning system with a plurality of indoor expansion valves. A method for sequencing the initialization of each indoor expansion valve upon system startup is disclosed. The method includes the following steps:

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Tokyo, Japan

Takeshi Kuramochi