Air conditioner and control method

Abstract

This air conditioner is provided with an outdoor unit, an indoor unit, and refrigerant piping in which a refrigerant is circulated between the outdoor unit and the indoor unit. The air conditioner comprises: a refrigerant leakage detection sensor that detects leakage of the refrigerant; and a control unit that notifies that the refrigerant leakage detection sensor is close to the end of the service life thereof a predetermined period of time before the energization time of the refrigerant leakage detection sensor reaches a prescribed time, and that, if the energization time of the refrigerant leakage detection sensor reaches the prescribed time, notifies that the refrigerant leakage detection sensor has reached the end of the service life thereof, and causes an indoor unit fan included in the indoor unit to rotate regardless of the operation state.

Description

Air conditioner and control method

[0001] The present disclosure relates to an air conditioner and a control method.

[0002] For example, Patent Document 1 discloses a technology in which, when it is determined that the need for replacement of a refrigerant leak detection sensor in an air conditioner has been detected, replacement time notification information instructing notification of the need for replacement of the refrigerant leak detection sensor is sent to a remote controller, and the notification is displayed on the display unit of the remote controller.

[0003] International Publication No. 2017 / 199373

[0004] However, the technology disclosed in Patent Document 1 notifies the user of the need to replace the refrigerant leak detection sensor when it is determined that the refrigerant leak detection sensor needs to be replaced, but does not notify the user that the refrigerant leak detection sensor has reached the end of its life.As a result, if the user is unable to replace the refrigerant leak detection sensor despite receiving a notification, the refrigerant leak detection sensor may reach the end of its life, but there is no way to know that it has reached the end of its life.

[0005] If the need for replacement of the refrigerant leak detection sensor were to be detected when the refrigerant leak detection sensor reached the end of its life, it would be possible to notify the user that the refrigerant leak detection sensor had reached the end of its life, but the refrigerant leak may not be accurately detected at that point because the sensor has already reached the end of its life. Thus, there is a concern that the life of the refrigerant leak detection sensor may not be dealt with appropriately.

[0006] The present disclosure has been made in consideration of the above-mentioned circumstances, and one of its objects is to provide an air conditioner and a control method that enable appropriate measures to be taken regarding the lifespan of a refrigerant leak detection sensor.

[0007] The air conditioner according to the present disclosure is an air conditioner comprising an outdoor unit, an indoor unit, and refrigerant piping through which refrigerant circulates between the outdoor unit and the indoor unit, and further comprising a refrigerant leak detection sensor that detects leakage of the refrigerant, and a control unit that notifies the user that the refrigerant leak detection sensor is nearing the end of its life a predetermined time before the power-on time of the refrigerant leak detection sensor reaches a specified time, and that notifies the user that the refrigerant leak detection sensor has reached the specified time when the power-on time of the refrigerant leak detection sensor reaches the specified time, and also rotates an indoor unit fan provided in the indoor unit regardless of the operating state.

[0008] Furthermore, the present disclosure provides a control method for an air conditioner that includes an outdoor unit, an indoor unit, and refrigerant piping through which refrigerant circulates between the outdoor unit and the indoor unit, the control unit notifying that the refrigerant leakage detection sensor that detects leakage of the refrigerant is nearing the end of its life a predetermined time before the power-on time of the refrigerant leakage detection sensor reaches a specified time, and, when the power-on time of the refrigerant leakage detection sensor reaches the specified time, notifying that the refrigerant leakage detection sensor has reached the end of its life and rotating an indoor unit fan provided in the indoor unit regardless of the operating state.

[0009] According to the present disclosure, it is possible to appropriately deal with the lifespan of a refrigerant leak detection sensor.

[0010] FIG. 1 is an explanatory diagram illustrating an overview of an air conditioner according to a first embodiment. FIG. 2 is a diagram illustrating an overview of a refrigerant circuit of an air conditioner according to the first embodiment. A perspective view showing an indoor unit according to the first embodiment. A cross-sectional view showing an indoor unit according to the first embodiment. A schematic block diagram illustrating an example configuration of an air conditioner according to the first embodiment. A flowchart illustrating an example of lifespan notification processing according to the first embodiment. A schematic block diagram illustrating an example configuration of an air conditioner according to a second embodiment. A flowchart illustrating an example of lifespan advance notification timing change processing according to the second embodiment. A schematic block diagram illustrating an example configuration of an air conditioner according to a third embodiment. A flowchart illustrating an example of lifespan notification processing according to the third embodiment. A schematic block diagram illustrating an example configuration of an air conditioner according to a fourth embodiment.

[0011] Hereinafter, embodiments will be described with reference to the drawings. First Embodiment First, the first embodiment will be described. [Overview of Air Conditioner] In air conditioners that use a specific refrigerant, standards require a system configuration that can detect refrigerant. Therefore, a refrigerant leak detection sensor is provided to detect refrigerant leaks. Refrigerant leak detection sensors have a limited lifespan, and when the sensor reaches the end of its lifespan, its detection performance deteriorates, and it may become impossible to accurately detect refrigerant leaks.

[0012] Therefore, the air conditioner according to this embodiment detects the life of the refrigerant leak detection sensor and notifies the user to prevent a decline in refrigerant leak detection performance due to the refrigerant leak detection sensor reaching the end of its life. Here, the life of the refrigerant leak detection sensor is specified, for example, as the amount of time (cumulative time) that the refrigerant leak detection sensor is energized from the time it is energized until a decline in detection performance occurs. This energization time (specified time) specified as the life is preset as part of the specifications of the refrigerant leak detection sensor.

[0013] 1 is an explanatory diagram illustrating an overview of an air conditioner according to this embodiment. In this diagram, the process related to the life of a refrigerant leakage detection sensor is shown in chronological order as (A), (B), and (C).

[0014] (A) When the main power supply (original power supply) is turned on and the air conditioner starts to use, it starts measuring the power-on time of the refrigerant leak detection sensor. Then, based on the power-on time of the refrigerant leak detection sensor, the air conditioner notifies the user in two stages: (B) when the refrigerant leak detection sensor is nearing the end of its life, and (C) when it has reached the end of its life.

[0015] (B) The air conditioner notifies the user that the refrigerant leak detection sensor is nearing the end of its life (hereinafter referred to as "advance life notification") when a predetermined time has elapsed since the refrigerant leak detection sensor was first energized and before the specified time has elapsed (when the sensor is nearing the end of its life). For example, when issuing an advance life notification, the air conditioner blinks an LED (Light Emission Diode) on the indoor unit only when the device is turned on or off. The air conditioner may also output a buzzer sound in response to the blinking of the LED.

[0016] (C) When the refrigerant leak detection sensor has been energized for a further period of time and has reached a specified time (when it has reached its end of life), the air conditioner notifies the user that the refrigerant leak detection sensor has reached the end of its life (hereinafter referred to as "end of life notification"). For example, when notifying the user of the end of its life, the air conditioner causes the indoor unit's LED to flash except when the main power supply (original power source) is off. The air conditioner may also output a buzzer sound in response to the LED flashing.

[0017] Furthermore, when the air conditioner issues a lifespan notification, it rotates the indoor unit fan to perform agitation operation. This agitation operation is performed to agitate the air in the room when a refrigerant leak occurs. When the refrigerant leak detection sensor reaches the end of its lifespan, the air conditioner performs agitation operation because there is a possibility that a refrigerant leak will not be detected even if it is present.

[0018] The air conditioner may swing a flap (airflow direction adjustment plate) when performing agitation operation. When notifying the end of life of the air conditioner, the indoor unit sends an error code to notify the outdoor unit of an error. Upon receiving this error code, the outdoor unit stops the compressor.

[0019] In this way, the air conditioner according to this embodiment issues a first-stage notification in advance of the end of life a predetermined time before the refrigerant leak detection sensor's power-on time reaches the specified time (when the sensor is approaching the end of its life), and issues a second-stage notification at the end of its life when the refrigerant leak detection sensor's power-on time reaches the specified time (when the sensor has reached the end of its life). Hereinafter, the predetermined time before the specified time is referred to as "power-on time 1," and the specified time is referred to as "power-on time 2."

[0020] 2 is a diagram showing an outline of the refrigerant circuit of the air conditioner according to this embodiment. The illustrated air conditioner 100 includes an outdoor unit 10 installed outdoors and an indoor unit 20 installed indoors. The outdoor unit 10 and the indoor unit 20 are connected by refrigerant pipes 51 and 52. The outdoor unit 10 is provided with a four-way valve 15, which switches the refrigerant circulation direction to switch between heating and cooling operation.

[0021] In heating operation, the gaseous refrigerant compressed by the compressor 13 flows through the four-way valve 15 and refrigerant pipe 51 to the indoor unit heat exchanger 25. The refrigerant in the indoor unit heat exchanger 25 exchanges heat with the surrounding air to warm it. The refrigerant that has become liquid through the heat exchange passes through the refrigerant pipe 52 and the expansion valve 16 and flows into the outdoor unit heat exchanger 14. The refrigerant in the outdoor unit heat exchanger 14 exchanges heat with the surrounding air. The refrigerant that has become gaseous through the heat exchange passes through the four-way valve 15 and returns to the compressor 13.

[0022] During cooling operation, the gaseous refrigerant compressed by the compressor 13 flows through the four-way valve 15 into the outdoor heat exchanger 14. The refrigerant in the outdoor heat exchanger 14 exchanges heat with the surrounding air. The refrigerant that has become liquid through heat exchange passes through the expansion valve 16 and refrigerant piping 52 and flows into the indoor heat exchanger 25. The refrigerant in the indoor heat exchanger 25 exchanges heat with the surrounding air, cooling it. The refrigerant that has become gaseous through heat exchange returns to the compressor 13 through the four-way valve 15 via refrigerant piping 51.

[0023] Next, the configuration of the indoor unit 20 that detects refrigerant leakage in the air conditioner 100 will be described with reference to Figures 3 and 4. Figure 3 is a perspective view of the indoor unit 20. Figure 4 is a cross-sectional view of the indoor unit 20. In Figures 3 and 4, components corresponding to those shown in Figure 2 are assigned the same reference numerals.

[0024] The indoor unit 20 is a wall-mounted indoor unit that is fixed to a wall surface inside a room. The indoor unit 20 has a housing 21 that is a substantially rectangular parallelepiped that is long in the left-right direction. An intake port 21a is formed on the top surface of the housing 21. An exhaust port 21b is formed on the bottom side of the front surface of the housing 21 (the surface opposite the wall when fixed to the wall).

[0025] An indoor unit fan 22 and an indoor unit heat exchanger 25 are provided inside the housing 21 of the indoor unit 20. When the indoor unit fan 22 rotates, air drawn in through the air inlet 21a passes through the indoor unit heat exchanger 25, exchanges heat with the refrigerant in the indoor unit heat exchanger 25, and is blown out from the air outlet 21b.

[0026] The air outlet 21b is provided with a flap 23. The flap 23 is an airflow direction adjusting plate that can adjust the direction of air blown out from the air outlet 21b. For example, the air outlet 21b is provided with two types of flaps 23: an up-down flap 23a and a left-right flap 23b. The up-down flap 23a can change the direction of air blown out from the air outlet 21b in the up-down direction. The left-right flap 23b can change the direction of air blown out from the air outlet 21b in the left-right direction.

[0027] A refrigerant leakage detection sensor 26 is provided inside the housing 21 of the indoor unit 20. The refrigerant leakage detection sensor 26 detects refrigerant leakage in the indoor unit 20. The refrigerant leakage detection sensor 26 may be provided as part of the indoor unit 20, or may be separately attachable to the indoor unit 20.

[0028] Furthermore, an LED 27 is provided on the underside of the housing 21 of the indoor unit 20, except for the air outlet 21b. The LED 27 is a lighting unit that lights up depending on the state of the indoor unit 20. For example, the LED 27 lights up when the indoor unit 20 is operating and turns off when the operation stops. Furthermore, as described above, the LED 27 flashes to notify the user of the end of life in advance and at the end of life depending on the power-on time of the refrigerant leak detection sensor 26.

[0029] Next, the configuration of the air conditioner 100 will be described in detail with reference to Fig. 5. Fig. 5 is a schematic block diagram showing an example of the configuration of the air conditioner 100 according to this embodiment. Note that in Fig. 5, components corresponding to those shown in Figs. 2, 3, and 4 are assigned the same reference numerals.

[0030] The outdoor unit 10 includes an outdoor unit fan 12, a compressor 13, an outdoor unit heat exchanger 14, a four-way valve 15, an expansion valve 16, a temperature sensor 17, an outdoor unit communication unit 101, and an outdoor unit control unit 110. The outdoor unit control unit 110 controls each part of the outdoor unit 10. The temperature sensor 17 outputs a signal corresponding to the temperature of the outdoor unit heat exchanger 14 or the outside air temperature. The outdoor unit control unit 110 acquires the output of the temperature sensor 17 and detects the refrigerant temperature of the outdoor unit heat exchanger 14, the outside air temperature, etc.

[0031] For example, the outdoor unit control unit 110 controls the frequency of the compressor 13, the direction of refrigerant flow in the four-way valve 15, the opening of the expansion valve 16, etc. based on the operation mode, the state of the refrigerant, the outside air temperature, etc. In addition, the outdoor unit control unit 110 communicates various types of information with the indoor unit 20 via the outdoor unit communication unit 101.

[0032] The indoor unit 20 includes an indoor unit fan 22, a flap 23, a temperature and humidity sensor 24, an indoor unit heat exchanger 25, a refrigerant leak detection sensor 26, an LED 27 (lighting unit), a buzzer 28 (sound output unit), an indoor unit communication unit 201, and an indoor unit control unit 210. The indoor unit control unit 210 controls each part of the indoor unit 20. The temperature and humidity sensor 24 outputs a signal according to the temperature and humidity of the room in which the indoor unit 20 is installed. The indoor unit control unit 210 acquires the output of the temperature and humidity sensor 24 and detects the temperature, humidity, etc. of the room.

[0033] The refrigerant leak detection sensor 26 detects a refrigerant leak in the indoor unit 20 and outputs the detection result to the indoor unit control unit 210. The refrigerant leak detection sensor 26 also measures the power-on time for which it is energized. The refrigerant leak detection sensor 26 then determines whether the measured power-on time has reached power-on time 1, and if it determines that power-on time 1 has been reached, outputs information indicating that the power-on time of the refrigerant leak detection sensor 26 has exceeded power-on time 1 (hereinafter referred to as "power-on time 1 elapsed information") to the indoor unit control unit 210. The refrigerant leak detection sensor 26 also determines whether the measured power-on time has reached power-on time 2, and if it determines that power-on time 2 has been reached, outputs information indicating that the power-on time of the refrigerant leak detection sensor 26 has exceeded power-on time 2 (hereinafter referred to as "power-on time 2 elapsed information") to the indoor unit control unit 210.

[0034] The indoor unit control unit 210 performs cooling or heating operation based on the indoor temperature and humidity, the operation mode set by the user, the set temperature and wind direction, etc., and controls each part such as the indoor unit fan 22, the flap 23, the indoor unit heat exchanger 25, and the LED 27. The indoor unit control unit 210 also communicates various types of information with the outdoor unit 10 via the indoor unit communication unit 201.

[0035] Furthermore, the indoor unit control unit 210 determines whether or not there is a refrigerant leak based on the detection result output from the refrigerant leak detection sensor 26. For example, if the indoor unit control unit 210 determines that a refrigerant leak has occurred, it rotates the indoor unit fan 22 to perform stirring operation.

[0036] The indoor unit control unit 210 also acquires the determination result of the power-on time from the refrigerant leak detection sensor 26. For example, when the indoor unit control unit 210 acquires information that one power-on time has elapsed from the refrigerant leak detection sensor 26, it issues a life advance notification to notify that the refrigerant leak detection sensor 26 is nearing the end of its life (see FIG. 1B). That is, the indoor unit control unit 210 issues a life advance notification a predetermined time before the power-on time of the refrigerant leak detection sensor 26 reaches a specified time. For example, when issuing a life advance notification, the indoor unit control unit 210 causes the LED 27 to flash only when operation is on or off. Note that the indoor unit control unit 210 may output a buzzer sound from the buzzer 28 instead of or in addition to the flashing of the LED 27.

[0037] Furthermore, when the indoor unit control unit 210 acquires information indicating that the refrigerant leak detection sensor 26 has reached the end of its life, it issues a life end notification to notify the user that the refrigerant leak detection sensor 26 has reached the end of its life (see FIG. 1C). That is, the indoor unit control unit 210 issues a life end notification when the refrigerant leak detection sensor 26 has been powered for a specified time. For example, when issuing a life end notification, the indoor unit control unit 210 causes the LED 27 to flash except when the main power supply (original power source) is off. Note that the indoor unit control unit 210 may output a buzzer sound from the buzzer 28 instead of or in addition to the flashing of the LED 27.

[0038] Furthermore, when issuing the end-of-life notification, the indoor unit control unit 210 performs agitation operation by rotating the indoor unit fan 22. Note that the indoor unit control unit 210 may swing the flap 23 when performing agitation operation to change the direction of air blown out from the air outlet 21 b by the rotation of the indoor unit fan 22.

[0039] Furthermore, when notifying the end of life, the indoor unit control unit 210 transmits an abnormality code to notify the outdoor unit 10 of the abnormality via the indoor unit communication unit 201. Then, when the outdoor unit control unit 110 of the outdoor unit 10 receives this abnormality code via the outdoor unit communication unit 101, it stops the compressor 13.

[0040] [Operation of lifespan notification process of refrigerant leak detection sensor] Next, with reference to Fig. 6, the operation of the lifespan notification process for notifying the lifespan of the refrigerant leak detection sensor 26 in two stages, advance lifespan notification and end-of-life notification, in the air conditioner 100 will be described. Fig. 6 is a flowchart showing an example of the lifespan notification process of the refrigerant leak detection sensor 26 according to this embodiment.

[0041] (Step S101) The refrigerant leakage detection sensor 26 measures the power-on time of the refrigerant leakage detection sensor 26. Then, the process proceeds to step S103.

[0042] (Step S103) The refrigerant leak detection sensor 26 determines whether the power-on time of the refrigerant leak detection sensor 26 has reached power-on time 1. If the refrigerant leak detection sensor 26 determines that power-on time 1 has been reached (YES), it outputs power-on time 1 elapsed information to the indoor unit control unit 210 and proceeds to step S105. On the other hand, if the refrigerant leak detection sensor 26 determines that power-on time 1 has not been reached (NO), it returns to step S101.

[0043] (Step S105) If the refrigerant leakage detection sensor 26 outputs the power supply time 1 elapsed information in step S103, the indoor unit control unit 210 acquires the power supply time 1 elapsed information that has been output. Then, the process proceeds to step S107.

[0044] (Step S107) The indoor unit control unit 210 issues a life advance notification to notify that the refrigerant leakage detection sensor 26 is nearing the end of its life. For example, when issuing a life advance notification, the indoor unit control unit 210 causes the LED 27 to flash only when operation is on or off. Note that the indoor unit control unit 210 may output a buzzer sound from the buzzer 28 instead of or in addition to the flashing operation of the LED 27. Then, the process proceeds to step S109.

[0045] (Step S109) The refrigerant leak detection sensor 26 determines whether the power-on time of the refrigerant leak detection sensor 26 has reached power-on time 2. If the refrigerant leak detection sensor 26 determines that power-on time 2 has been reached (YES), it outputs power-on time 2 elapsed information to the indoor unit control unit 210 and proceeds to step S111. On the other hand, if the refrigerant leak detection sensor 26 determines that power-on time 2 has not been reached (NO), it returns to step S101.

[0046] (Step S111) If the refrigerant leakage detection sensor 26 outputs the second power supply time elapsed information in step S109, the indoor unit control unit 210 acquires the second power supply time elapsed information. Then, the process proceeds to step S113.

[0047] (Step S113) The indoor unit control section 210 performs the stirring operation by rotating the indoor unit fan 22. Then, the process proceeds to step S115.

[0048] (Step S115) The indoor unit control unit 210 issues a life end notification to notify the user that the refrigerant leak detection sensor 26 has reached the end of its life. For example, when issuing the life end notification, the indoor unit control unit 210 causes the LED 27 to flash except when the main power supply (original power supply) is off. Note that the indoor unit control unit 210 may output a buzzer sound from the buzzer 28 instead of or in addition to the flashing of the LED 27. The indoor unit control unit 210 also swings the flap 23 when performing the stirring operation. When issuing the life end notification, the indoor unit control unit 210 also transmits an abnormality code to the outdoor unit 10 via the indoor unit communication unit 201 to notify the outdoor unit 10 of an abnormality. When the outdoor unit control unit 110 of the outdoor unit 10 receives this abnormality code via the outdoor unit communication unit 101, it stops the compressor 13.

[0049] The order of the processes in steps S113 and S115 may be reversed.

[0050] As described above, the air conditioner 100 according to this embodiment includes an outdoor unit 10, an indoor unit 20, and refrigerant piping through which a refrigerant circulates between the outdoor unit 10 and the indoor unit 20. The air conditioner 100 also includes a refrigerant leak detection sensor 26 that detects refrigerant leaks, and an indoor unit control unit 210 (an example of a control unit). The indoor unit control unit 210 issues a notification (e.g., a life advance notification) that the refrigerant leak detection sensor 26 is nearing the end of its life a predetermined time before the refrigerant leak detection sensor 26 has been energized for a specified time (e.g., when energization time 1 has been reached). Furthermore, when the refrigerant leak detection sensor 26 has been energized for a specified time (e.g., when energization time 2 has been reached), the indoor unit control unit 210 issues a notification (e.g., a life end notification) that the refrigerant leak detection sensor 26 has reached the end of its life, and rotates the indoor unit fan 22 included in the indoor unit 20 regardless of the operating state.

[0051] As a result, the air conditioner 100 not only notifies when the refrigerant leak detection sensor 26 is nearing the end of its life, but also notifies when the refrigerant leak detection sensor 26 has reached the end of its life, thereby enabling appropriate measures to be taken in response to the life of the refrigerant leak detection sensor 26.

[0052] For example, the air conditioner 100 notifies the user that the refrigerant leak detection sensor 26 is nearing the end of its life through the first-stage advance life notification, and can urge the user who receives the notification to replace the refrigerant leak detection sensor 26 before the refrigerant leak detection sensor 26 reaches its life and the air conditioner 100 becomes unable to operate normally. In this way, by setting a period for urging the user to replace the refrigerant leak detection sensor 26 before the refrigerant leak detection sensor 26 reaches its life, the air conditioner 100 can replace the refrigerant leak detection sensor 26 before the air conditioner 100 becomes unable to operate normally, thereby reducing the possibility of the air conditioner 100 becoming unusable. Furthermore, even if the refrigerant leak detection sensor 26 cannot be replaced in time before it reaches its life, the air conditioner 100 can make preparations for replacement by urging the user to replace the refrigerant leak detection sensor 26 in advance, thereby shortening the time until the air conditioner 100 becomes unusable.

[0053] Furthermore, the air conditioner 100 notifies the user that the refrigerant leak detection sensor 26 has reached the end of its life through the second stage end of life notification and operates the indoor unit fan 22 in agitation mode, thereby making the user who receives the notification aware that the air conditioner 100 can no longer be operated normally and urging them to replace the refrigerant leak detection sensor 26.

[0054] For example, the refrigerant leakage detection sensor 26 detects a refrigerant leak in the indoor unit 20. The indoor unit control unit 210 notifies that the refrigerant leakage detection sensor 26 is nearing the end of its life or that it has reached the end of its life by controlling an LED 27 (an example of a lighting unit) or a buzzer 28 (an example of a sound output unit) provided in the indoor unit 20.

[0055] This allows the air conditioner 100 to issue a notification urging the replacement of the refrigerant leak detection sensor 26 even if the air conditioner 100 is a model that does not have a display unit capable of displaying text on a remote controller or the like.

[0056] In addition, the indoor unit control unit 210 controls the LED 27 or the buzzer 28 when notifying that the refrigerant leakage detection sensor 26 is nearing the end of its life, and controls the LED 27 or the buzzer 28 when notifying that the refrigerant leakage detection sensor 26 has reached the end of its life, differently.

[0057] As a result, the air conditioner 100 can distinguish between when the refrigerant leak detection sensor 26 is nearing the end of its life and when it has reached the end of its life, even if it is simply notified by turning on the LED 27 or outputting a buzzer sound from the buzzer 28.

[0058] In addition, when the power supply time of the refrigerant leakage detection sensor 26 reaches a specified time (for example, when power supply time 2 is reached), the indoor unit control unit 210 rotates the indoor unit fan 22 and changes the wind direction of the air blown out from the air outlet 21b due to the rotation of the indoor unit fan 22.

[0059] This allows the air conditioner 100 to more efficiently stir the leaked refrigerant during the stirring operation that is performed when the refrigerant leakage detection sensor 26 reaches the end of its life.

[0060] The refrigerant leak detection sensor 26 also measures the power-on time for which the refrigerant leak detection sensor 26 is powered, determines whether the measured power-on time has reached a predetermined time before the specified time (for example, whether power-on time 1 has been reached) and whether the specified time has been reached (for example, whether power-on time 2 has been reached), and transmits the determination result to the indoor unit control unit 210. The indoor unit control unit 210 then acquires the determination result from the refrigerant leak detection sensor 26.

[0061] As a result, the air conditioner 100 can receive the judgment result regarding the lifespan from the refrigerant leak detection sensor 26 according to the power-on time of the refrigerant leak detection sensor 26, so there is no need for the indoor unit control unit 210 to measure the power-on time or judge the lifespan, making it easier to design.

[0062] The indoor unit control unit 210 may measure the power-on time during which the refrigerant leak detection sensor 26 is powered, and determine whether the measured power-on time has reached a predetermined time before the specified time (for example, whether power-on time 1 has been reached) and whether the specified time has been reached (for example, whether power-on time 2 has been reached).

[0063] As a result, the air conditioner 100 measures the power-on time and determines the lifespan on the indoor unit control unit 210 side, so the timing of notifying that the refrigerant leak detection sensor 26 is nearing the end of its life and the timing of notifying that the refrigerant leak detection sensor 26 has reached the end of its life can be adjusted depending on the specifications or use of the air conditioner 100.

[0064] For example, the refrigerant leak detection sensor 26 is provided in the indoor unit 20. This allows the air conditioner 100 to easily detect refrigerant leaks using the refrigerant leak detection sensor 26 built into the indoor unit 20.

[0065] The refrigerant leakage detection sensor 26 may be configured separately from the indoor unit 20 or may be attachable to the indoor unit 20.

[0066] As a result, even if the air conditioner 100 is a model that does not have a refrigerant leak detection sensor 26 installed, it will be able to detect refrigerant leaks by attaching a separate refrigerant leak detection sensor 26 .

[0067] The control method for the air conditioner 100, which is equipped with an outdoor unit 10, an indoor unit 20, and refrigerant piping through which refrigerant circulates between the outdoor unit 10 and the indoor unit 20, includes the steps of the indoor unit control unit 210 notifying that the refrigerant leak detection sensor 26, which detects refrigerant leakage, is nearing the end of its life (e.g., advance life notification) a predetermined time before the power-on time of the refrigerant leak detection sensor 26 reaches a specified time (e.g., when power-on time 1 is reached), and notifying that the refrigerant leak detection sensor 26 has reached the end of its life (e.g., end-of-life notification) when the power-on time of the refrigerant leak detection sensor 26 reaches the specified time (e.g., when power-on time 2 is reached), and rotating the indoor unit fan 22 equipped in the indoor unit 20 regardless of the operating state.

[0068] As a result, the control method in the air conditioner 100 not only notifies when the refrigerant leak detection sensor 26 is nearing the end of its life, but also notifies when the refrigerant leak detection sensor 26 has reached the end of its life, thereby enabling appropriate responses to be made in relation to the life of the refrigerant leak detection sensor 26.

[0069] For example, the control method in the air conditioner 100 notifies the user that the refrigerant leak detection sensor 26 is nearing the end of its life through a first-stage advance lifespan notification, and can prompt the user who receives the notification to replace the refrigerant leak detection sensor 26 before the refrigerant leak detection sensor 26 reaches the end of its lifespan and the air conditioner 100 becomes unable to operate normally.

[0070] Furthermore, the control method in the air conditioner 100 notifies the user that the refrigerant leak detection sensor 26 has reached the end of its life by issuing a second-stage end-of-life notification and operates the indoor unit fan 22 in agitation mode, thereby making the user who receives the notification aware that normal operation of the air conditioner 100 is no longer possible and encouraging them to replace the refrigerant leak detection sensor 26.

[0071] Second Embodiment Next, a second embodiment will be described. Fig. 7 is a schematic block diagram showing an example of the configuration of an air conditioner 100A according to this embodiment. The illustrated air conditioner 100A differs from the air conditioner 100 according to the first embodiment shown in Fig. 5 in that the timing of issuing a life advance notification is changed by detecting a human body in the room. Note that in Fig. 7, components corresponding to those shown in Fig. 5 are assigned the same reference numerals.

[0072] The air conditioner 100A includes an outdoor unit 10 and an indoor unit 20A. The indoor unit 20A differs from the indoor unit 20 shown in Fig. 5 in that it further includes a human presence sensor 29 and that the indoor unit control unit 210A further performs control using the human presence sensor 29.

[0073] The human presence sensor 29 detects human bodies in the indoor space in which the indoor unit 20A is installed, and outputs a signal according to the detection result (for example, the number of detected human bodies) to the indoor unit control unit 210A.

[0074] When the indoor unit control unit 210A acquires the output (detection result) from the human presence sensor 29, it changes the power supply time 1 based on the detection result of the human presence sensor 29. That is, when issuing a life advance notification a predetermined time before the power supply time of the refrigerant leakage detection sensor 26 reaches a specified time, the indoor unit control unit 210A changes this predetermined time based on the detection result of the human presence sensor 29.

[0075] For example, the indoor unit control unit 210A refers to the detection history of human bodies detected by the human presence sensor 29, and if there are many human body detections, it shortens the power-on time 1 (i.e., lengthens the above-mentioned predetermined time) and advances the timing of issuing the first stage of advance life notification based on the power-on time of the refrigerant leak detection sensor 26. This makes it possible to prompt the replacement of the refrigerant leak detection sensor 26 at an earlier stage.

[0076] Next, with reference to Fig. 8 , we will explain the operation of the life advance notification timing change process in which the indoor unit control unit 210A changes the life advance notification timing based on the detection result of the human presence sensor 29. Fig. 8 is a flowchart showing an example of the life advance notification timing change process according to this embodiment.

[0077] (Step S201) The indoor unit control section 210A acquires and records the detection result of the human presence sensor 29. Then, the process proceeds to step S203.

[0078] (Step S203) The indoor unit control unit 210A refers to the history of the detection results of the human presence sensor 29 recorded in step S201 and determines whether the detection frequency at which a human body has been detected is equal to or greater than a predetermined threshold. If the indoor unit control unit 210A determines that the detection frequency is less than the predetermined threshold (NO), the process returns to step S201. On the other hand, if the indoor unit control unit 210A determines that the detection frequency is equal to or greater than the predetermined threshold (YES), the process proceeds to step S205.

[0079] (Step S205) If it is determined in step S203 that the detection frequency is equal to or greater than the predetermined threshold, the indoor unit control unit 210A shortens the energization time 1 because the number of human bodies detected in the indoor space in which the indoor unit 20A is installed (i.e., the number of people using the room) is large. Then, the process returns to step S101.

[0080] It should be noted that, after shortening the power supply time 1, if the frequency of human body detection by the human presence sensor 29 falls below a predetermined threshold, the indoor unit control unit 210A may return the shortened power supply time 1 to its original length.

[0081] As described above, the air conditioner 100A according to this embodiment is equipped with a human presence sensor 29 that detects a human body in the indoor space in which the indoor unit 20A is installed. The indoor unit control unit 210A changes the power supply time 1 based on the detection result of the human presence sensor 29. That is, when issuing a life advance notification a predetermined time before the power supply time of the refrigerant leak detection sensor 26 reaches a specified time, the indoor unit control unit 210A changes this predetermined time based on the detection result of the human presence sensor 29.

[0082] As a result, the air conditioner 100A can notify the user that the refrigerant leak detection sensor 26 is nearing the end of its life and prompt the user to replace the refrigerant leak detection sensor 26 at an appropriate timing based on the frequency of use by people in the indoor space in which the indoor unit 20A is installed.

[0083] For example, if the frequency at which the human body is detected by the human sensor 29 is equal to or greater than a predetermined threshold, the indoor unit control unit 210A shortens the energization time 1 (i.e., lengthens the above-mentioned predetermined time).

[0084] As a result, in an indoor space where people use the air conditioner 100A frequently, the impact of the air conditioner 100A becoming unusable is significant, but by encouraging the replacement of the refrigerant leak detection sensor 26 at an earlier stage, the possibility of the air conditioner 100A becoming unusable can be reduced.

[0085] <Third embodiment> Next, a third embodiment will be described. Fig. 9 is a schematic block diagram showing an example of the configuration of an air conditioner 100B according to this embodiment. The illustrated air conditioner 100B differs from the air conditioner 100 according to the first embodiment shown in Fig. 5 in that it also transmits notifications related to the life of the refrigerant leak detection sensor 26 (e.g., advance life notification, end-of-life notification) to an external server 50 connected via the Internet. Note that in Fig. 9, components corresponding to those shown in Fig. 5 are denoted by the same reference numerals.

[0086] The air conditioner 100B includes an outdoor unit 10 and an indoor unit 20B. The indoor unit 20B differs from the indoor unit 20 shown in Fig. 5 in that an indoor unit control unit 210B communicates with an external server 50 via an indoor unit communication unit 201B.

[0087] The indoor unit communication unit 201B is communicatively connected by wire to the outdoor unit control unit 110 and the indoor unit control unit 210B as well as to the repeater 40. In addition to being communicatively connected by wire to the indoor unit communication unit 201B, the repeater 40 is communicatively connected by wireless to the router 45 and communicatively connected to a public line such as the Internet NW via the router 45. This allows the indoor unit communication unit 201B to communicate with an external server 50 communicatively connected to the Internet NW via the repeater 40, the router 45, and the Internet NW. The external server 50 may be, for example, a cloud server.

[0088] With the above configuration, the indoor unit control unit 210B communicates with an external server 50 via the Internet NW. For example, the indoor unit control unit 210B transmits information based on the power-on time of the refrigerant leakage detection sensor 26 to the external server 50.

[0089] For example, a predetermined time before the energization time of the refrigerant leak detection sensor 26 reaches a specified time (for example, when energization time 1 is reached), the indoor unit control unit 210B transmits notification information to the external server 50 notifying that the refrigerant leak detection sensor 26 is nearing the end of its life (for example, an advance end of life notification). Furthermore, when the energization time of the refrigerant leak detection sensor 26 reaches a specified time (for example, when energization time 2 is reached), the indoor unit control unit 210B transmits notification information to the external server 50 notifying that the refrigerant leak detection sensor 26 has reached the end of its life (for example, an end of life notification).

[0090] Next, with reference to Fig. 10 , the operation of the lifespan notification process in the air conditioner 100B, which notifies the external server 50 of the lifespan of the refrigerant leak detection sensor 26 in two stages, a lifespan advance notification and a lifespan end notification, will be described. Fig. 10 is a flowchart showing an example of the lifespan notification process for the refrigerant leak detection sensor 26 according to this embodiment.

[0091] Note that the processes of steps S301 to S315 shown in Fig. 10 correspond to the processes of steps S101 to S115 shown in Fig. 6, and are similar to the processes of steps S307 and S315 except that some of the processes are different from the processes of steps S107 and S115. Here, only the differences from the processes shown in Fig. 6 will be described, and a description of the similar processes will be omitted.

[0092] First, the processing of step S307 will be described. (Step S307) The indoor unit control unit 210B issues a life advance notification to notify that the refrigerant leak detection sensor 26 is nearing the end of its life. For example, when issuing a life advance notification, the indoor unit control unit 210B causes the LED 27 to flash only when operation is on or off. Note that the indoor unit control unit 210B may output a buzzer sound from the buzzer 28 instead of or in addition to the flashing of the LED 27. The indoor unit control unit 210B also notifies the external server 50 that the refrigerant leak detection sensor 26 is nearing the end of its life. Specifically, the indoor unit control unit 210B transmits notification information to the external server 50 notifying that the refrigerant leak detection sensor 26 is nearing the end of its life. Then, the process proceeds to step S309.

[0093] Next, the processing of step S315 will be described. (Step S315) The indoor unit control unit 210B issues a life end notification to notify that the refrigerant leak detection sensor 26 has reached the end of its life. For example, when issuing the life end notification, the indoor unit control unit 210B causes the LED 27 to flash except when the main power supply (original power supply) is off. Note that the indoor unit control unit 210B may output a buzzer sound from the buzzer 28 instead of or in addition to the flashing of the LED 27. The indoor unit control unit 210B also notifies the external server 50 that the refrigerant leak detection sensor 26 has reached the end of its life. Specifically, the indoor unit control unit 210B transmits notification information to the external server 50 notifying that the refrigerant leak detection sensor 26 has reached the end of its life. The indoor unit control unit 210B also swings the flap 23 when performing agitation operation. When issuing the life end notification, the indoor unit control unit 210B also transmits an abnormality code to the outdoor unit 10 via the indoor unit communication unit 201 to notify the outdoor unit 10 of an abnormality. When the outdoor unit control unit 110 of the outdoor unit 10 receives this abnormality code via the outdoor unit communication unit 101 , it stops the compressor 13 .

[0094] The order of steps S313 and S315 may be reversed.

[0095] As described above, the air conditioner 100B according to this embodiment includes an indoor unit communication unit 201B (an example of a communication unit) that communicates with an external server 50 (an example of an external server) via the Internet NW. The indoor unit control unit 210B transmits information based on the power-on time of the refrigerant leakage detection sensor 26 to the external server 50 via the indoor unit communication unit 201B.

[0096] As a result, the air conditioner 100B notifies an external server 50, such as a cloud server, of the need to replace the refrigerant leak detection sensor 26, so that not only the user of the air conditioner 100B but also service personnel and others can be made aware of the need to replace the refrigerant leak detection sensor 26, thereby improving serviceability.

[0097] For example, a predetermined time before the energization time of the refrigerant leak detection sensor 26 reaches a specified time (for example, when energization time 1 is reached), the indoor unit control unit 210B transmits notification information to the external server 50 notifying that the refrigerant leak detection sensor 26 is nearing the end of its life. Furthermore, when the energization time of the refrigerant leak detection sensor 26 reaches a specified time (for example, when energization time 2 is reached), the indoor unit control unit 210B transmits notification information to the external server 50 notifying that the refrigerant leak detection sensor 26 has reached the end of its life.

[0098] As a result, the air conditioner 100B notifies an external server 50, such as a cloud server, that the refrigerant leak detection sensor 26 is nearing the end of its life through a first-stage advance life notification, and notifies it that the refrigerant leak detection sensor 26 has reached the end of its life through a second-stage end-of-life notification, allowing a service technician or the like to understand the degree to which the refrigerant leak detection sensor 26 needs to be replaced and to make appropriate preparations for replacement.

[0099] The indoor unit control unit 210B does not have to send notification information notifying that the refrigerant leak detection sensor 26 is nearing the end of its life to the external server 50 a predetermined time before the power-on time of the refrigerant leak detection sensor 26 reaches a specified time (for example, when power-on time 1 is reached). On the other hand, the indoor unit control unit 210B sends notification information notifying that the refrigerant leak detection sensor 26 has reached the end of its life to the external server 50 when the power-on time of the refrigerant leak detection sensor 26 reaches a specified time (for example, when power-on time 2 is reached). In this way, the indoor unit control unit 210B may send notification information to the external server 50 in only one of the two stages of notification (for example, when the latter stage of the notification has reached the end of its life).

[0100] This allows the air conditioner 100B to reliably notify not only the user of the air conditioner 100B but also service personnel and others of the need to replace the refrigerant leak detection sensor 26 only when it becomes necessary to replace the refrigerant leak detection sensor 26.

[0101] <Fourth embodiment> Next, a fourth embodiment will be described. Fig. 11 is a schematic block diagram showing an example of the configuration of an air conditioner 100C according to this embodiment. In the illustrated air conditioner 100C, a plurality of indoor units 20 (20-1, 20-2, ... 20-N, where N is a positive integer) are connected to a single outdoor unit 10. Refrigerant is circulated between the single outdoor unit 10 and the plurality of indoor units 20 using refrigerant piping.

[0102] The indoor unit control unit 210 of each indoor unit 20 issues a notification that the refrigerant leak detection sensor 26 is nearing the end of its life (for example, an advance life notification) a predetermined time before the power-on time of the refrigerant leak detection sensor 26 in at least one of the indoor units 20 reaches a specified time (for example, when power-on time 1 is reached). Furthermore, the indoor unit control unit 210 of each indoor unit 20 issues a notification that the refrigerant leak detection sensor 26 has reached the end of its life (for example, an end-of-life notification) when the power-on time of the refrigerant leak detection sensor 26 in at least one of the indoor units 20 reaches a specified time (for example, when power-on time 2 is reached).

[0103] As a result, the air conditioner 100C notifies when the refrigerant leak detection sensor 26 of any one of the multiple indoor units 20 is approaching the end of its life or has reached the end of its life, making it possible to take appropriate measures in response to the life of the refrigerant leak detection sensor 26.

[0104] If the refrigerant leak detection sensor 26 in even one of the multiple indoor units 20 reaches the end of its life, all of the air conditioners 100C must be shut down from normal operation as a safety measure under the regulations. However, by providing a period of time to prompt replacement before even one refrigerant leak detection sensor 26 reaches the end of its life, the refrigerant leak detection sensor 26 can be replaced before all of the air conditioners 100C are shut down, reducing the possibility of the air conditioners 100C becoming unusable. Alternatively, even if the refrigerant leak detection sensor 26 cannot be replaced in time, the amount of time the air conditioners 100C become unusable can be shortened.

[0105] Furthermore, when the energization time of the refrigerant leakage detection sensor 26 in at least one of the plurality of indoor units 20 reaches a specified time (for example, when energization time 2 is reached), the indoor unit control unit 210 of each indoor unit 20 rotates the indoor unit fan 22 provided in each of the plurality of indoor units 20. Note that when performing this stirring operation, the indoor unit control unit 210 of each indoor unit 20 may swing the flap 23 to change the wind direction of the air blown out from the air outlet 21 b by the rotation of the indoor unit fan 22.

[0106] As a result, when the refrigerant leak detection sensor 26 of at least one indoor unit 20 reaches the end of its life, the air conditioner 100C can efficiently stir the leaked refrigerant by operating all indoor units 20 in stirring mode.

[0107] Each embodiment has been described above in detail with reference to the drawings, but the specific configuration is not limited to these embodiments, and it is possible to combine the embodiments, or to modify or omit the embodiments as appropriate.

[0108] For example, in the above embodiment, an example was described in which the LED 27 flashes only when the device is on or off during the first stage of life advance notification, and flashes when the main power supply (original power supply) is not off during the second stage of life end notification, but the notification method is not limited to this. For example, any notification method can be used, such as flashing the LED 27 during the first stage of life advance notification and lighting the LED 27 during the second stage of life end notification. Furthermore, when a buzzer sound is output from the buzzer 28 in response to the flashing or lighting of the LED 27, the type of buzzer sound can also be determined arbitrarily.

[0109] Furthermore, during the stirring operation described in the above embodiment, the air volume of the air blown out from the air outlet 21b may be changed by the rotation of the indoor unit fan 22. For example, to further enhance the stirring effect, the air volume may be changed at predetermined time intervals during the stirring operation.

[0110] Furthermore, the flashing (illuminating) function of the LED 27 or the function of outputting a buzzer sound from the buzzer 28 in the above embodiment may be a function of a remote controller that accepts an operation to set information related to the operation of the air conditioner 100 (100A, 100B, 100C). For example, instead of or in addition to flashing (illuminating) the LED 27 or outputting a buzzer sound from the buzzer 28, an LED provided in the remote controller may flash (illuminate) or a buzzer may output a buzzer sound. In this case, the indoor unit control 210 (210A, 210B) instructs the remote controller to issue a life advance notification or life end notification.

[0111] Although the LED 27 is described as an example of a lighting unit, any light-emitting device may be used, and the present invention is not limited to an LED. Furthermore, although the buzzer 28 is described as an example of a sound output unit, any device capable of sound output (e.g., a speaker) may be used, and the present invention is not limited to a buzzer.

[0112] It is also possible to record a program for realizing the functions of the outdoor unit control unit 110 and the indoor unit control 210 (210A, 210B) on a computer-readable recording medium, and have a computer system load and execute the program to perform the processing of the outdoor unit control unit 110 and the indoor unit control 210 (210A, 210B). Note that the term "computer system" here includes hardware such as the OS and peripheral devices.

[0113] Furthermore, "computer-readable recording media" refers to portable media such as flexible disks, optical magnetic disks, ROMs, and CD-ROMs, as well as storage devices such as hard disks built into computer systems. Furthermore, "computer-readable recording media" also includes devices that dynamically store programs for a short period of time, such as communication lines used when transmitting programs over networks like the Internet or communication lines like telephone lines, and devices that store programs for a fixed period of time, such as volatile memory within computer systems that serve as servers or clients. The programs may also be programs that implement some of the aforementioned functions, or may be programs that can achieve the aforementioned functions in combination with programs already stored in the computer system. The programs may also be stored on a designated server and distributed (e.g., downloaded) over communication lines in response to requests from other devices.

[0114] Furthermore, some or all of the functions of the outdoor unit control unit 110 and the indoor unit control unit 210 (210A, 210B) may be realized as an integrated circuit such as an LSI (Large Scale Integration). Each function may be individually processed, or some or all of the functions may be integrated into a processor. Furthermore, the integrated circuit method is not limited to LSI, and may be realized using a dedicated circuit or a general-purpose processor. Furthermore, if an integrated circuit technology that can replace LSI emerges due to advances in semiconductor technology, an integrated circuit based on that technology may be used.

[0115] DESCRIPTION OF SYMBOLS 8 Temperature sensor 9 Humidity sensor 10 Outdoor unit 12 Outdoor unit fan 13 Compressor 14 Outdoor unit heat exchanger 15 Four-way valve 16 Expansion valve 17 Temperature sensor 20, 20A, 20B, 20C Indoor unit 21 Housing 21a Intake port 21b Outlet port 22 Indoor unit fan 23 (23a, 23b) Flap 24 Temperature and humidity sensor 25 Indoor unit heat exchanger 26 Refrigerant leak detection sensor 27 LED 28 Buzzer 29 Human presence sensor 40 Repeater 45 Router 50 Server 51, 52 Refrigerant piping 100, 100A, 100B, 100C Air conditioner 101 Outdoor unit communication unit 110 Outdoor unit control unit 201, 201B Indoor unit communication unit 210, 210A, 210B Indoor unit control unit

Claims

1. An air conditioner comprising an outdoor unit, an indoor unit, and refrigerant piping through which refrigerant is circulated between the outdoor unit and the indoor unit, A refrigerant leak detection sensor for detecting the leakage of the aforementioned refrigerant, A control unit that notifies that the refrigerant leak detection sensor is nearing the end of its lifespan before a predetermined time when the energized time of the refrigerant leak detection sensor reaches a predetermined time, and when the energized time of the refrigerant leak detection sensor reaches the predetermined time, notifies that the refrigerant leak detection sensor has reached the end of its lifespan, and also rotates the indoor unit fan of the indoor unit regardless of the operating state, and further changes the airflow direction of the air blown out from the outlet by the rotation of the indoor unit fan, An air conditioner equipped with [a specific feature].

2. The refrigerant leak detection sensor detects the leakage of the refrigerant in the indoor unit. The control unit, The indoor unit controls the indicator light or sound output unit to notify the user when the refrigerant leak detection sensor is nearing the end of its lifespan or when the refrigerant leak detection sensor has reached the end of its lifespan. The air conditioner according to claim 1.

3. The control unit, The control content for controlling the indicator light or sound output unit when the refrigerant leak detection sensor is nearing the end of its lifespan is made different from the control content for controlling the indicator light or sound output unit when the refrigerant leak detection sensor has reached the end of its lifespan. The air conditioner according to claim 2.

4. The refrigerant leak detection sensor is The refrigerant leak detection sensor measures the energized time, determines whether the measured energized time reached a predetermined time before the predetermined time and whether the predetermined time has been reached, and transmits the determination result to the control unit. The control unit, The determination result is obtained from the refrigerant leak detection sensor. The air conditioner according to claim 1.

5. The control unit, The system measures the energized time while the refrigerant leak detection sensor is powered, and determines whether the measured energized time reached a predetermined time before the predetermined time, and whether the predetermined time has been reached. The air conditioner according to claim 1.

6. The indoor unit is equipped with a motion sensor that detects human bodies in the indoor space where the indoor unit is installed. The control unit, The predetermined time is changed based on the detection result of the aforementioned human presence sensor. The air conditioner according to claim 1.

7. The control unit, If the frequency at which a human body is detected by the aforementioned human presence sensor exceeds a predetermined threshold, the predetermined time is extended. The air conditioner according to claim 6.

8. It is equipped with a communication unit that communicates with external servers via the internet, The control unit, Information based on the energizing time of the refrigerant leak detection sensor is transmitted to the external server via the communication unit. The air conditioner according to claim 1.

9. The control unit, Before the predetermined time when the energized time of the refrigerant leak detection sensor reaches the predetermined time, a notification information indicating that the refrigerant leak detection sensor is nearing the end of its lifespan is sent to the external server. When the energized time of the refrigerant leak detection sensor reaches a specified time, a notification message indicating that the refrigerant leak detection sensor has reached the end of its lifespan is sent to the external server. The air conditioner according to claim 8.

10. The control unit, Before the predetermined time when the energized time of the refrigerant leak detection sensor reaches the predetermined time, the system does not send notification information to the external server indicating that the refrigerant leak detection sensor is nearing the end of its lifespan. When the energized time of the refrigerant leak detection sensor reaches a specified time, a notification message indicating that the refrigerant leak detection sensor has reached the end of its lifespan is sent to the external server. The air conditioner according to claim 8.

11. The refrigerant is circulated between multiple indoor units and one outdoor unit using the refrigerant piping. The control unit, In at least one of the multiple indoor units, before the predetermined time when the energized time of the refrigerant leak detection sensor reaches the predetermined time, a notification is given that the refrigerant leak detection sensor is nearing the end of its lifespan. If the energized time of the refrigerant leak detection sensor in at least one of the multiple indoor units reaches a specified time, a notification is made that the refrigerant leak detection sensor has reached the end of its lifespan. The air conditioner according to claim 1.

12. The control unit, If the energized time of the refrigerant leak detection sensor in at least one of the multiple indoor units reaches a specified time, the indoor unit fan of each of the multiple indoor units is rotated. The air conditioner according to claim 11.

13. An air conditioner comprising an outdoor unit, an indoor unit, and refrigerant piping through which refrigerant is circulated between the outdoor unit and the indoor unit, A refrigerant leak detection sensor for detecting the leakage of the aforementioned refrigerant, When the energized time of the refrigerant leak detection sensor reaches a specified time, the control unit rotates the indoor unit fan of the indoor unit and changes the airflow direction of the air blown out from the outlet by the rotation of the indoor unit fan, An air conditioner equipped with [a specific feature].

14. The refrigerant leak detection sensor is provided in the indoor unit. An air conditioner according to claim 1 or claim 13.

15. The refrigerant leak detection sensor is configured separately from the indoor unit and can be attached to the indoor unit. An air conditioner according to claim 1 or claim 13.

16. A control method for an air conditioner comprising an outdoor unit, an indoor unit, and refrigerant piping through which refrigerant is circulated between the outdoor unit and the indoor unit, The control unit, A step of notifying that the refrigerant leak detection sensor, which detects the leakage of the refrigerant, is nearing the end of its lifespan, before a predetermined time has passed since the energized time of the refrigerant leak detection sensor reached a specified time. When the energized time of the refrigerant leak detection sensor reaches the specified time, the system notifies that the refrigerant leak detection sensor has reached the end of its lifespan, and rotates the indoor unit fan of the indoor unit regardless of its operating state, and further changes the direction of the air blown out from the outlet by the rotation of the indoor unit fan. A control method including

17. A control method for an air conditioner comprising an outdoor unit, an indoor unit, and refrigerant piping through which refrigerant is circulated between the outdoor unit and the indoor unit, The refrigerant leak detection sensor detects the leakage of the refrigerant, The control unit, when the energized time of the refrigerant leak detection sensor reaches a specified time, rotates the indoor unit fan of the indoor unit and changes the airflow direction of the air blown out from the outlet by the rotation of the indoor unit fan, A control method including