Abstract: A refrigeration apparatus includes a refrigerant circuit including a utilization unit. The utilization unit includes: a heat exchanger; first and second refrigerant pipes connected to the heat exchanger; and first and second shutoff valves each of whose opening degrees are adjustable and which are respectively provided at the first refrigerant pipe and the second refrigerant pipe. The refrigeration apparatus includes: a refrigerant leakage detector; a refrigerant pressure acquiring part; and a controller configured to adjust the opening degrees of the first shutoff valve and the second shutoff valve. In an alert state where the first shutoff valve and the second shutoff valve are both closed and the refrigerant leakage detector detects the leakage, the controller adjusts the opening degree of at least one of the first and second shutoff valves to open when the pressure of the refrigerant is greater than a predetermined threshold value.

Abstract: An air-conditioning light-emitting system includes: air conditioners; light emitters; a first communication means that connects the air conditioners and that causes the air conditioners to communicate with each other; a plurality of second communication means that each connects one of the air conditioners to one of the light emitters and that causes the one of the air conditioners to communicate with the one of the light emitters; and a controller that controls the light emitters by using the first communication means and the second communication means.

Abstract: An air-conditioning device includes: a suction air temperature sensor provided in an indoor unit; a wireless temperature sensor unit separate from the indoor unit; an abnormal condition determining section determining whether or not the wireless temperature sensor unit is in an abnormal condition; an index setting section setting a temperature index value; and a controller controlling operation of the air-conditioning device based on the set temperature index value. While the abnormal condition determining section determines that the wireless temperature sensor unit is in the abnormal condition, the index setting section determines a measurement value of the suction air temperature sensor to be the temperature index value.

Abstract: An air-conditioning device includes: a suction air temperature sensor provided in an indoor unit; a wireless temperature sensor unit separate from the indoor unit; an abnormal condition determining section determining whether or not the wireless temperature sensor unit is in an abnormal condition; an index setting section setting a temperature index value; and a controller controlling operation of the air-conditioning device based on the set temperature index value. While the abnormal condition determining section determines that the wireless temperature sensor unit is in the abnormal condition, the index setting section determines a measurement value of the suction air temperature sensor to be the temperature index value.

Abstract: An air conditioner selection system according to the present invention is capable of efficiently selecting an air conditioner that satisfies a safety standard requirement in a case where a refrigerant leaks. An air conditioner selection system (100) is a system for selecting an air conditioner (50) including an indoor unit (52). The air conditioner selection system (100) is provided with a floor area acquisition section (12a), an allowable refrigerant amount acquisition section (12b), and an air conditioner selection section (12c). The floor area acquisition section (12a) acquires a floor area of a room (3) where the indoor unit (52) is to be installed. The allowable refrigerant amount acquisition section (12b) acquires an allowable refrigerant amount of a refrigerant allowed to remain in the room (3) at least based on the floor area acquired by the floor area acquisition section (12a).

Abstract: An indoor unit, being configured to constitute a refrigeration apparatus including a refrigerant circuit, includes: a heat exchanger; and a plurality of refrigerant pipes. R32 refrigerant is enclosed in the refrigerant circuit. At least one of the plurality of refrigerant pipes that circulates the R32 refrigerant has an outer diameter of (Do-1)/8 inches while another of the plurality of refrigerant pipes that circulates R410A refrigerant has an outer diameter of Do/8.

Abstract: A refrigeration apparatus includes a refrigerant circuit including a utilization unit. The utilization unit includes: a heat exchanger; a first refrigerant pipe and a second refrigerant pipe connected to the heat exchanger; and a first shutoff valve and a second shutoff valve whose opening degrees are adjustable and which are respectively provided at the first refrigerant pipe and the second refrigerant pipe. The refrigeration apparatus includes: a refrigerant leakage detector; a refrigerant pressure acquiring part; and a controller configured to adjust the opening degrees of the first shutoff valve and the second shutoff valve. In an alert state where the first shutoff valve and the second shutoff valve are both closed and the refrigerant leakage detector detects the leakage, the controller adjusts the opening degree of at least one of the first shutoff valve and the second shutoff valve to open when the pressure of the refrigerant is greater than a predetermined threshold value.

Abstract: A receiver unit includes: a receiving section receiving a signal of a measurement value (Tm2) transmitted from a wireless temperature sensor unit; an input connector connected to a sensor signal line, the sensor signal line being configured to transfer a signal of a measurement value (Tm1) of the suction air temperature sensor; a signal generator generating a signal serving as an index of indoor temperature, based on the measurement values (Tm1, Tm2) of the wireless temperature sensor unit and the suction air temperature sensor; and a signal output section outputting the signal generated by the signal generator to a controller of an air-conditioning device.

Abstract: A receiver unit includes: a receiving section receiving a signal of a measurement value (Tm2) transmitted from a wireless temperature sensor unit; an input connector connected to a sensor signal line, the sensor signal line being configured to transfer a signal of a measurement value (Tm1) of the suction air temperature sensor; a signal generator generating a signal serving as an index of indoor temperature, based on the measurement values (Tm1, Tm2) of the wireless temperature sensor unit and the suction air temperature sensor; and a signal output section outputting the signal generated by the signal generator to a controller of an air-conditioning device.

Abstract: An air-conditioning device includes: a suction air temperature sensor provided in an indoor unit; a wireless temperature sensor unit separate from the indoor unit; an abnormal condition determining section determining whether or not the wireless temperature sensor unit is in an abnormal condition; an index setting section setting a temperature index value; and a controller controlling operation of the air-conditioning device based on the set temperature index value. While the abnormal condition determining section determines that the wireless temperature sensor unit is in the abnormal condition, the index setting section determines a measurement value of the suction air temperature sensor to be the temperature index value.