The present invention is to provide a refrigeration cycle apparatus that has a low GWP of 750 or less and low flammability and that maintains performance and safety for an extended period of time. The refrigeration cycle apparatus includes a compressor (300) that compresses a refrigerant, a condenser that condenses the refrigerant compressed by the compressor (300), a pressure reducer that reduces a pressure of the refrigerant condensed by the condenser, and an evaporator that evaporates the refrigerant reduced in pressure by the pressure reducer. The refrigerant is a mixed refrigerant which contains difluoromethane, pentafluoroethane, and trifluoroiodomethane and which has a global warming potential of 750 or less and a vapor pressure at 25° C. of 1.1 MPa or more and 1.8 MPa or less. The compressor (300) is a sealed electric compressor in which a refrigerator oil to lubricate a sliding portion is charged. The refrigerator oil is polyol ester oil and has a water content of 300 ppm by weight or less.

The present invention is to provide a refrigeration cycle apparatus that has a low GWP of 750 or less and low flammability and that maintains performance and safety for an extended period of time. The refrigeration cycle apparatus includes a compressor (300) that compresses a refrigerant, a condenser that condenses the refrigerant compressed by the compressor (300), a pressure reducer that reduces a pressure of the refrigerant condensed by the condenser, and an evaporator that evaporates the refrigerant reduced in pressure by the pressure reducer. The refrigerant is a mixed refrigerant which contains difluoromethane, pentafluoroethane, and trifluoroiodomethane and which has a global warming potential of 750 or less and a vapor pressure at 25° C. of 1.1 MPa or more and 1.8 MPa or less. The compressor (300) is a sealed electric compressor in which a refrigerator oil to lubricate a sliding portion is charged. The refrigerator oil is polyol ester oil and has a water content of 300 ppm by weight or less.

An air conditioner, including an outdoor unit and a control system, an air outlet being provided at the top of a box body of the outdoor unit. The air conditioner further includes a snow hood in communication with the air outlet, a rotation driving device connected to the snow hood, and a wind direction detection device provided on the box body. The snow hood is rotatably provided on the top of the box body, and the rotation driving device and the wind direction detection device both communicate with the control system.

An air conditioner, including an outdoor unit and a control system, an air outlet being provided at the top of a box body of the outdoor unit. The air conditioner further includes a snow hood in communication with the air outlet, a rotation driving device connected to the snow hood, and a wind direction detection device provided on the box body. The snow hood is rotatably provided on the top of the box body, and the rotation driving device and the wind direction detection device both communicate with the control system.

An air-conditioning apparatus includes; an outdoor unit including a compressor that compresses and discharges refrigerant to a refrigerant circuit; an indoor unit including a load-side heat exchanger that causes heat exchange to be performed between air in an air-conditioned space and a heat medium subjected to heat exchange with the refrigerant; a flow rate detection unit that detects a flow rate of the heat medium; and an alarm unit provided in the indoor unit. The alarm unit includes a determination unit and an abnormality alarm unit. The determination unit determines whether an abnormality occurs in the indoor unit or not based on the flow rate detected by the flow rate detection unit. The abnormality alarm unit outputs an alarm when the determination unit determines that the abnormality occurs in the indoor unit.

The disclosure provides an air conditioner capable of smoothly performing communication between an outdoor unit and indoor units using piping communication, and a piping communication method thereof. When communicating between an outdoor unit and indoor units using piping communication, a communication mode is automatically changed to a differential mode and a single mode to set the most suitable communication method for field characteristics according to a communication state, so that communication between the outdoor unit and the indoor units can be performed smoothly. This enables smooth piping communication by increasing a communication success rate even if a physical short between refrigerant pipes occurs in a multi-system air conditioner that connects a plurality of indoor units to a single outdoor unit, or even if there are more branch pipes for branching the refrigerant pipe.

The disclosure provides an air conditioner capable of smoothly performing communication between an outdoor unit and indoor units using piping communication, and a piping communication method thereof. When communicating between an outdoor unit and indoor units using piping communication, a communication mode is automatically changed to a differential mode and a single mode to set the most suitable communication method for field characteristics according to a communication state, so that communication between the outdoor unit and the indoor units can be performed smoothly. This enables smooth piping communication by increasing a communication success rate even if a physical short between refrigerant pipes occurs in a multi-system air conditioner that connects a plurality of indoor units to a single outdoor unit, or even if there are more branch pipes for branching the refrigerant pipe.

The present disclosure includes techniques that enable a conditioned air system to automatically restore functionality and/or to operate at reduced functionality when a fault is detected, for example, to facilitate reducing likelihood that continuing operation with the fault present will decrease lifespan of the conditioned air system. To facilitate improving operation of the conditioned air system when a fault is present, the control system of the conditioned air system may utilize substitute sensor data and/or adjust its control algorithm. In this manner, the control system may facilitate improving operational reliability and/or availability of the conditioned air system, for example, by adaptively adjusting its operation to enable the conditioned air system to continue operating even when a fault is present, while reducing likelihood that the continued operation will reduce lifespan of the conditioned air system.

The present disclosure includes techniques that enable a conditioned air system to automatically restore functionality and/or to operate at reduced functionality when a fault is detected, for example, to facilitate reducing likelihood that continuing operation with the fault present will decrease lifespan of the conditioned air system. To facilitate improving operation of the conditioned air system when a fault is present, the control system of the conditioned air system may utilize substitute sensor data and/or adjust its control algorithm. In this manner, the control system may facilitate improving operational reliability and/or availability of the conditioned air system, for example, by adaptively adjusting its operation to enable the conditioned air system to continue operating even when a fault is present, while reducing likelihood that the continued operation will reduce lifespan of the conditioned air system.

An air conditioner is provided. The air conditioner includes a housing, a heat exchanger positioned inside the housing, a fan for blowing air into the heat exchanger such that heat in the blown air is exchanged with the heat exchanger, a duct including a first channel forming surface, and a second channel forming surface, a porous panel corresponding to the second channel forming surface, and including a plurality of pores, a blade for swiveling between an open position and a closed position, blocking the low wind-speed channel at the open position so that air passed through the basic channel can be discharged outside of the air conditioner, moving the air passed through the basic channel to the low wind-speed channel, and discharging the air to the outside via the pores at the closed position, a driver for driving the blade to swivel, and a processor configured to control the driver.