Mitsubishi Electric Corporation

Katsuya Takeuchi

Hirokuni Shiba

An air-conditioning system includes an air-conditioning apparatus that includes a refrigerant circuit in which an indoor unit and an outdoor unit are connected to each other by a refrigerant pipe and inflammable refrigerant flows in the refrigerant pipe, and is configured to supply conditioned air to a plurality of areas corresponding to air-conditioned spaces, an air-conditioning duct that connects the indoor unit to the plurality of respective areas, a plurality of dampers that are arranged in the air-conditioning duct and openable and closable to interrupt or pass the conditioned air supplied to the plurality of respective areas, and a controller configured to control the dampers, in which the controller controls the dampers such that a total floor area of the areas to which the conditioned air is supplied is set as an area equal to or larger than a minimum floor area corresponding to a floor area with which an inflammable region is not formed even when the inflammable refrigerant is leaked.

Air-conditioning system

An air-conditioning apparatus includes an outdoor air temperature sensor detecting an outdoor temperature; a compressor temperature sensor detecting a temperature of an outer wall of a compressor; a liquid-level and concentration detection sensor detecting a liquid surface level in the compressor and a concentration of a lubricant oil in a liquid in the compressor; an electric heater heating the compressor; and a controller that carries out preheating to the compressor by driving the electric heater when a detection value of the outdoor air temperature sensor is higher than or equal to a detection value of the compressor temperature sensor and, further, when the liquid surface level detected by the liquid-level and concentration detection sensor is higher than or equal to a predetermined level and the concentration of the lubricant oil in the liquid is lower than a preset minimum required concentration.

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Tokyo, Japan

Katsuya Takeuchi