Mitsubishi Electric Corporation

Nobuhiro Wada

Yuji Motomura

Naofumi Takenaka

Kimitaka Kadowaki

Takuya Ito

Yasushi Okoshi

An air-conditioning apparatus includes a refrigerant circuit including a compressor, a heat-source-side heat exchanger, an expansion device, a load-side heat exchanger, and a shut-off valve connected in sequence by pipes to allow refrigerant to flow therethrough; a heat-source-side air-sending device configured to send air to the heat-source-side heat exchanger; a leakage detecting unit configured to detect refrigerant leakage; and a controller configured to perform cooling operation. The controller is configured to, if the leakage detecting unit detects refrigerant leakage during cooling operation, close the shut-off valve after lowering an operation frequency of the compressor and increasing a rotation speed of the heat-source-side air-sending device.

Air-conditioning apparatus

An air-conditioning system comprising: a heat source side unit; a use side unit; a relay unit; a refrigerant circuit; a water circuit; a controller configured to operate in a trial operation mode, and configured to operate in a normal operation mode; a first setting unit; a second setting unit; and a third setting unit, wherein the controller is configured to invalidate an error that occurs in the water circuit when the trial operation mode is set, a target for the trial operation in the trial operation mode is set to the refrigerant circuit, and invalidation of an error is set to be active, and invalidate an error that occurs in the refrigerant circuit when the trial operation mode is set, a target for the trial operation in the trial operation mode is set to the water circuit, and invalidation of an error is set to be active.

Air-conditioning system

A relay includes a first relay unit and a second relay unit provided between an outdoor unit and an indoor unit to allow refrigerant to circulate between the first relay unit and the outdoor unit and between the second relay unit and the outdoor unit, and a heat medium circuit connecting the first relay unit and the second relay unit to the indoor unit to allow a heat medium to circulate through the heat medium circuit. The second relay unit is installed above or on a top of the first relay unit.

Growing community of inventors

Tokyo, Japan

Nobuhiro Wada