Abstract: An air-conditioning apparatus performs air conditioning by causing heat exchange between refrigerant cycling through a refrigerant circuit and indoor and outdoor air. The air-conditioning apparatus includes a sensor and a control determination device. The sensor measures concentration of any of the refrigerant leaked into the air. The control determination unit determines leakage of the refrigerant in a case when the concentration of any refrigerant leaked into the air is greater than a first threshold. The control determination device further determines an abnormality in the sensor in any one of a case where a cumulative time period of determined leakages is greater than a predetermined time period, a case where a cumulative number of times of determined leakages is greater than a predetermined number, and a case where the value indicating the concentration of any refrigerant leaked into the air is greater than a higher second threshold.

Abstract: An air-conditioning apparatus includes an indoor unit and an outdoor unit connected to each other via a refrigerant pipe through which refrigerant flows. The air-conditioning apparatus includes a refrigerant sensor that detects leakage of the refrigerant in the indoor unit, a notification unit that provides a notification of occurrence of leakage of the refrigerant, a transmitter that communicates with an external terminal via a network, and a controller that controls the notification unit and the transmitter. The notification unit includes a display and a speaker disposed on a surface of a casing of the indoor unit, and the external terminal. When leakage of the refrigerant is detected by the refrigerant sensor, the controller controls the notification unit and the transmitter to provide a notification of occurrence of leakage of the refrigerant.

Abstract: An air-conditioning apparatus includes: a centrifugal air-sending device including a fan and a scroll casing having a tongue portion and a discharge portion, and a housing having a housing suction port and a discharge portion. A trailing edge of a blade located closest to a wall portion of the housing is a first trailing edge portion, and a leading edge of a blade located closest to the tongue portion is a first leading edge portion. In a first region, a boundary portion located closest to the tongue portion is located between first and second straight lines. The first straight line passes through a rotation axis of the fan and the first trailing edge portion, the second straight line is parallel to the first straight line and passes through the first leading edge portion, and the first region forms part of the housing suction port close to the tongue portion.

Abstract: An indoor heat exchanger includes: a plurality of heat transfer tubes including respective flow passages therein through which water flows as a heat medium; and a header that distributes water that flows into the header from an inflow tube connected to a heat source side to the plurality of heat transfer tubes. The header includes: a first plate-like member including a plurality of start-portion openings that communicate with respective start portions of the plurality of heat transfer tubes; and a second plate-like member joined to the first plate-like member, and including an inlet port through which water flows from the inflow tube into the second plate-like member, and a distribution recess formed opposite to the plurality of start-portion openings and communicating with the inlet port.

Abstract: A centrifugal air-sending device has blades that each have a vane length in a first region that is greater than a vane length in a second region, and are each formed such that a proportion for which a turbo vane portion accounts is higher in a radial direction than a proportion for which a sirocco vane portion accounts in the first region and the second region. The blades that are located closer to an outer circumference than is a blade inner diameter of inner circumferential ends of the blades at end portions of the blades that are close to a side plate in an axial direction are defined as a blade outer circumferential portion that is formed such that a vane thickness of each of the blades in decreased in the radial direction from an inner circumference toward the outer circumference.

Abstract: An air-conditioning apparatus having a refrigerant circuit, in which a compressor, an outdoor heat exchanger, an expansion device, and an indoor heat exchanger are connected by a pipe and refrigerant circulates in the pipe, includes an indoor fan configured to supply an indoor air to the indoor heat exchanger, and a controller configured to control the compressor and the indoor fan. The controller is configured to run the compressor at a start of a cooling operation, start running the indoor fan at less than a set minimum wind velocity after a first set time has elapsed since the compressor started operating, run the indoor fan at the set minimum wind velocity after a second set time has elapsed since the indoor fan started operating at less than the set minimum wind velocity, and run the indoor fan at a set wind velocity after a third set time has elapsed since the indoor fan started operating at the set minimum wind velocity.

Abstract: In an air-conditioning apparatus, an indoor unit and an outdoor unit are connected to each other by a refrigerant pipe through which refrigerant flows. The air-conditioning apparatus includes: a refrigerant detection unit that detects a leak of the refrigerant in the indoor unit; a notification unit that makes a notification indicating occurrence of the leak of the refrigerant; a controller that controls at least the notification unit; and a remote control unit configured to operate the indoor unit. When the refrigerant detection unit detects the leak of the refrigerant, the controller controls the notification unit to make in a first mode the notification indicating the occurrence of the leak of the refrigerant, and make the notification in a second mode different from the first mode after a predetermined time period elapses from time at which the notification in the first mode is made.

Abstract: The refrigerant leakage determination device includes a refrigerant detection sensor that detects presence of gas and transmits a concentration of the gas as a sensor output, an alarm device that issues an alarm about leakage of refrigerant, and a controller configured to control the alarm device based on the sensor output from the refrigerant detection sensor. The controller includes a storage device that stores two thresholds for the sensor output and two set times each having a length set for each threshold, and a processing device that, when the sensor output exceeds one or both of the two thresholds and a length of a time period during which the sensor output exceeds the one or both of the two thresholds is longer than either one of the two set times associated with the two thresholds, determines leakage of refrigerant and actuates the alarm device.

Abstract: An air-conditioning apparatus that uses refrigerant having a higher density than that of air, and includes a housing, an air inlet provided in a front surface of the housing to allow air in a room to flow into the housing, a heat exchanger that transfers heat between the refrigerant and the air that flows into the housing through the air inlet, an air outlet that allows the air subjected to heat exchange at the heat exchanger to be blown from the housing, a fan provided in an air passage extending from the air inlet to the air outlet, and a sensor that detects leakage of the refrigerant. The heat exchanger is provided above the fan, and the sensor is provided below the fan.

Abstract: An air-conditioning apparatus has an airflow direction deflector having a shaft located in a second airflow passage extending from a heat exchanger to an air outlet of an outer panel, the shaft being connected to a vane and an airflow speed reducer provided between the heat exchanger and the shaft in the second airflow passage. The airflow speed reducer is spaced apart from a first airflow passage wall located between a first airflow passage extending from an air inlet of the outer panel to the heat exchanger and the second airflow passage. The airflow moves between the airflow speed reducer and the shaft at an airflow speed slower than the airflow speed thereof between the heat exchanger and the airflow speed reducer.

Abstract: In an air-conditioning apparatus, an indoor unit and an outdoor unit are connected to each other by a refrigerant pipe through which refrigerant flows. The air-conditioning apparatus includes: a refrigerant detection unit that detects a leak of the refrigerant in the indoor unit; a notification unit that makes a notification indicating occurrence of the leak of the refrigerant; a controller that controls at least the notification unit; and a remote control unit configured to operate the indoor unit. When the refrigerant detection unit detects the leak of the refrigerant, the controller controls the notification unit to make in a first mode the notification indicating the occurrence of the leak of the refrigerant, and make the notification in a second mode different from the first mode after a predetermined time period elapses from time at which the notification in the first mode is made.

Abstract: An air-conditioning apparatus performs an air conditioning action by causing heat exchange to be performed between refrigerant cycling through a refrigerant circuit and indoor and outdoor air, the air-conditioning apparatus including: a measuring unit configured to measure a concentration of the refrigerant leaked into air; a control determination unit configured to determine leakage of the refrigerant in a case where a value indicating the concentration is equal to or more than a first threshold; and a storage unit configured to cumulate and store at least one of a time period elapsed during a determination of the leakage of the refrigerant and a number of times of the determination of the leakage of the refrigerant, wherein the control determination unit prohibits the air conditioning action in at least one case out of a case where the time period cumulated is equal to or more than a predetermined time period, a case where the number of times cumulated is equal to or more than a predetermined number, and a

Abstract: A fan according to the invention is a fan including a motor, a rotating shaft for transmitting rotation of the motor, and a boss part through which the rotating shaft is inserted at a rotation center. A distal end portion of the rotating shaft protrudes from the boss part, the distal end portion is inserted through a center hole of a washer, and is screwed with a fastening part, and the washer includes a washer bearing surface portion that is fastened by being sandwiched between the fastening part and an end surface of the boss part, and a washer outer peripheral portion surrounding an outer periphery of the washer bearing surface portion. The washer bearing surface portion and the washer outer peripheral portion are integrated with each other.

Abstract: An air-conditioning apparatus includes a refrigerant circuit in which refrigerant is circulated, and an indoor unit configured to accommodate a load-side heat exchanger of the refrigerant circuit. The indoor unit includes an air outlet provided in the housing, an air inlet provided in the housing below the air outlet, an air passage that extends between the air inlet and the air outlet via the load-side heat exchanger, a refrigerant detection unit disposed below the air inlet, and a first partition plate configured to separate the air passage from a space in which the refrigerant detection unit is installed.

Abstract: An air-conditioning apparatus is provided with an indoor unit and an outdoor unit connected to each other via a refrigerant pipe through which refrigerant flows. The air-conditioning apparatus includes a refrigerant detection unit configured to detect leakage of the refrigerant in the indoor unit, a notification unit configured to provide a notification of occurrence of leakage of the refrigerant, a communication unit capable of communicating with an external terminal device via a network, and a controller configured to control at least the notification unit and the communication unit. The notification unit includes at least one of a display unit and a speaker disposed on a surface of a casing of the indoor unit, and the external terminal device, in addition to a display unit disposed on a remote controller for operating the indoor unit.

Abstract: An air conditioner has a casing and a wind direction changing device. The casing has an air inlet, an air outlet, an outer air path wall, and an inner air path wall. The wind direction changing device has an up-down rotation shaft and a deflector. The deflector extends from the up-down rotation shaft toward the outer air path wall. The deflector has an outer air path wall-side end which faces the outer air path wall and has a first arc shape.

Abstract: An air-conditioning apparatus includes a housing having an air inlet and an air outlet, a fan disposed in the housing, and a bell mouth through which a fluid flowing from the air inlet to the air outlet passes in association with rotation of the fan. The bell mouth includes curved part having a curved sectional shape in a fluid flow direction and a vibration-damping element disposed on at least one of a front surface and a rear surface of the curved part. The vibration-damping element is disposed at a position corresponding to a node of vibration of the bell mouth.

Abstract: An indoor unit of an air-conditioning apparatus includes a suction grille having an air inlet through which air flows in, a decorative panel to which the suction grille is mounted and having an air outlet through which the air flows out, a casing to which the decorative panel is mounted and defining an air passage between the air inlet and the air outlet, a fan located to face the suction grille in the casing and configured to cause the air to flow in through the air inlet and flow out through the air outlet, a heat exchanger located in the air passage between the fan and the air outlet in the casing and configured to exchange heat between refrigerant flowing in the heat exchanger and the air, and a refrigerant detection sensor configured to detect leakage of the refrigerant.

Abstract: The refrigerant leakage determination device includes a refrigerant detection sensor that detects presence of gas and transmits a concentration of the gas as a sensor output, an alarm device that issues an alarm about leakage of refrigerant, and a controller configured to control the alarm device based on the sensor output from the refrigerant detection sensor. The controller includes a storage device that stores two thresholds for the sensor output and two set times each having a length set for each threshold, and a processing device that, when the sensor output exceeds one or both of the two thresholds and a length of a time period during which the sensor output exceeds the one or both of the two thresholds is longer than either one of the two set times associated with the two thresholds, determines leakage of refrigerant and actuates the alarm device.

Abstract: An air-conditioning apparatus includes a refrigerant circuit, an indoor fan, a temperature sensor provided in an area adjacent to a seam in a refrigerant pipe of the refrigerant circuit, and a controller configured to determine the presence of refrigerant leakage on the basis of a decrease in the temperature measured by the temperature sensor. The controller is configured to determine the presence of refrigerant leakage while the indoor fan is stopped, and stop the determination of the presence of refrigerant leakage while a defrosting operation is performed.