Air conditioner

Abstract

To provide an air conditioner capable of recognizing a condition in another indoor unit of indoor units connected to the same refrigerant system, and capable of suppressing deterioration in comfortability of a user.SOLUTION: A centralized controller 50 controls an opening / closing device located on the upstream side of an indoor unit 20 to be closed when refrigerant leakage of the indoor unit 20 is detected by a refrigerant leakage sensor 40. The centralized controller 50 controls the opening / closing device to be in a refrigerant leakage condition stopping a cooling operation or a heating operation of the indoor unit 20 when the opening / closing device located on the upstream side of the indoor unit 20 is in the closing condition and also the refrigerant leakage sensor 40 of the indoor unit 20 detects the refrigerant, and controls the opening / closing device to be in an operation restricted condition changing the operation to a bowing operation or stopping the operation of the indoor unit 20, when shutoff values 34, 36 located on the upstream side of the indoor unit 20 are in closing conditions and also the refrigerant leakage sensor 40 of the indoor unit 20 does not detect the refrigerant.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an air conditioner. [Background technology]

[0002] Conventionally, an air conditioning apparatus has been proposed in which an indoor unit is provided with a refrigerant leak sensor that detects refrigerant leaks and a display that alerts the user that a refrigerant leak has occurred when the refrigerant leak sensor detects a refrigerant leak, and when a refrigerant leak is detected by the refrigerant leak sensor in any of the indoor units, the multiple displays alert the user that a refrigerant leak has occurred, thereby effectively communicating to the user that a refrigerant leak has occurred and improving the safety of the user (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-223650 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned conventional technology, when indoor units are installed in multiple rooms, the user of the indoor unit from which the refrigerant has leaked can recognize the refrigerant leakage, but cannot recognize the refrigerant leakage state of other indoor units connected to the same refrigerant system. Therefore, when the refrigerant supply to other indoor units is stopped or the other indoor units become unable to operate due to a refrigerant leakage, the users of the other indoor units cannot recognize the operating state of the same refrigerant system.

[0005] In addition, if a refrigerant leaks, other indoor units connected to the same refrigerant system as the indoor unit with the leaking refrigerant will also stop operating. This means that although users can check whether or not there is a refrigerant leak, there is an unavoidable decrease in user comfort thereafter. The present invention has been made in consideration of the above-mentioned points, and has an object to provide an air conditioning apparatus that is capable of recognizing the status of other indoor units among indoor units connected to the same refrigerant system, and that is capable of preventing a decrease in user comfort. [Means for solving the problem]

[0006] In order to achieve the above object, an air conditioner of the present invention includes an outdoor unit having at least a compressor and a heat source side heat exchanger, a plurality of indoor units having at least a user side heat exchanger and a blower, and a liquid refrigerant piping and a gas refrigerant piping connecting the outdoor unit and the indoor units, the air conditioner further includes an opening and closing device that is provided upstream of the indoor units on the liquid refrigerant piping and the gas refrigerant piping and blocks the flow of refrigerant in the liquid refrigerant piping and the gas refrigerant piping, a refrigerant leakage sensor that detects refrigerant leakage from the indoor units, and a control device that performs opening and closing control of the opening and closing device based on a detection signal from the refrigerant leakage sensor. When the control device detects a refrigerant leak in the indoor unit by the refrigerant leak sensor, it controls the opening and closing device located upstream of the indoor unit to close, and when the opening and closing device located upstream of the indoor unit is in the closed state and the refrigerant leak sensor of the indoor unit detects refrigerant, the control device controls the indoor unit to a refrigerant leak state that stops cooling operation or heating operation, and when the opening and closing device located upstream of the indoor unit is in the closed state and the refrigerant leak sensor of the indoor unit does not detect refrigerant, the control device controls the operation of the indoor unit to a fan operation or an operation restricted state that stops the operation. Effect of the Invention

[0007] According to the present invention, if an indoor unit leaks refrigerant, the shutoff valves on the liquid refrigerant piping and gas refrigerant piping are closed to stop operation, and other indoor units connected to the same liquid refrigerant piping and gas refrigerant piping are controlled to an operation restricted state, so that the other indoor units can be operated to blow air, preventing a decrease in comfort for users of the other indoor units. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram showing an embodiment of an air conditioning device according to the present invention; [Diagram 2] A block diagram showing a control configuration of the present embodiment. [Diagram 3] Flowchart showing the operation of this embodiment DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] A first invention relates to an air conditioning apparatus including an outdoor unit having at least a compressor and a heat source side heat exchanger, a plurality of indoor units having at least a utilization side heat exchanger and a blower, and a liquid refrigerant piping and a gas refrigerant piping connecting the outdoor unit and the indoor units, the air conditioning apparatus further including an opening and closing device provided upstream of the indoor units in the liquid refrigerant piping and the gas refrigerant piping for blocking the flow of refrigerant in the liquid refrigerant piping and the gas refrigerant piping, a refrigerant leakage sensor for detecting refrigerant leakage from the indoor units, and a control device for controlling the opening and closing of the opening and closing device based on a detection signal from the refrigerant leakage sensor, When the refrigerant leakage sensor detects a refrigerant leakage in the indoor unit, the control device controls the opening and closing device located upstream of the indoor unit to close, and when the opening and closing device located upstream of the indoor unit is in the closed state and the refrigerant leakage sensor of the indoor unit detects refrigerant, the control device controls the indoor unit to a refrigerant leakage state that stops cooling operation or heating operation, and when the opening and closing device located upstream of the indoor unit is in the closed state and the refrigerant leakage sensor of the indoor unit does not detect refrigerant, the control device controls the operation of the indoor unit to fan operation or an operation restricted state that stops the operation.

[0010] According to this, if an indoor unit leaks refrigerant, the opening and closing devices for the liquid refrigerant piping and gas refrigerant piping are closed and operation is stopped, and other indoor units connected to the same liquid refrigerant piping and gas refrigerant piping are controlled to an operation restricted state, so that the other indoor units can be operated to blow air, preventing a decrease in comfort for users of the other indoor units.

[0011] In a second aspect of the present invention, when the opening and closing device located upstream of the indoor unit is in an open state, the control device controls the indoor unit to an operable state in which any one of a cooling operation, a heating operation, and a fan operation can be performed.

[0012] With this, even if an indoor unit leaks refrigerant, other indoor units connected to other liquid refrigerant piping and gas refrigerant piping that are not closed by the opening and closing device can perform either cooling operation, heating operation or fan operation without interrupting the flow of refrigerant, thereby preventing a decrease in user comfort.

[0013] In a third aspect of the present invention, the control device is provided with a display unit for checking the operating state of the indoor unit, and the control device causes the display unit to display whether the indoor unit is in a refrigerant leakage state, an operation restricted state, or an operational state.

[0014] According to this, the control device causes the display unit to display whether the indoor unit is in a refrigerant leakage state, an operation restricted state, or an operation possible state, allowing the manager to recognize which indoor units cannot perform air conditioning operation, which indoor units cannot perform air conditioning operation but can perform fan operation, and which indoor units can perform air conditioning operation. As a result, after operation is stopped, the operating status can be quickly communicated to the users of the space in which each indoor unit is located.

[0015] In a fourth aspect of the invention, each of the indoor units is provided with a display unit, and the control device causes the display unit of the indoor unit in a refrigerant leaking state to indicate that it is in a refrigerant leaking state and that there is an indoor unit in an operable state, the display unit of the indoor unit in an operation restricted state to indicate that it is in an operation restricted state and that there is an indoor unit in an operable state, and the display unit of the indoor unit in an operation permitted state to indicate that it is in an operable state and that there is an indoor unit in a refrigerant leaking state.

[0016] This allows users of the indoor units to know which indoor units cannot perform air conditioning operation and which indoor units can perform air conditioning operation. Also, since it is possible to recognize the occurrence of a refrigerant leak in the same refrigerant piping system or in another refrigerant piping system, it is possible to notify users of a refrigerant leak state in multiple indoor units.

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a schematic diagram showing an embodiment of an air conditioner according to the present invention. Note that the air conditioner to which the present invention is applied is not limited to this, and various air conditioners are applicable.

[0018] As shown in Fig. 1, the air conditioner 1 includes an outdoor unit 10 and a plurality of indoor units 20. The outdoor unit 10 houses, for example, a compressor 11 (see Fig. 2), an outdoor heat exchanger, and a four-way valve that switches the refrigerant flow path. The outdoor unit 10 and the indoor unit 20 are provided with a liquid refrigerant pipe 30 and a gas refrigerant pipe 32 that connect the compressor of the outdoor unit 10 and the heat exchanger of the indoor unit 20.

[0019] In this embodiment, an example is shown in which five rooms, Rooms A to E, are provided as rooms in which the indoor units 20 are installed. One indoor unit 20 is installed in each of the rooms A, B, C, and E. In addition, two indoor units 20 are installed in the room D.

[0020] The liquid refrigerant pipe 30 branches into a first liquid refrigerant pipe 30a and a second liquid refrigerant pipe 30b. The gas refrigerant pipe 32 branches into a first gas refrigerant pipe 32a and a second gas refrigerant pipe 32b. The first liquid refrigerant pipe 30a and the first gas refrigerant pipe 32a are connected to the indoor unit 20 in room A, the indoor unit 20 in room B, and the indoor unit 20 in room C, respectively. The second liquid refrigerant piping 30b and the second gas refrigerant piping 32b are connected to the two indoor units 20 in room D and the indoor unit 20 in room E, respectively.

[0021] A first liquid cutoff valve 34a serving as an opening / closing device is provided in the middle of the first liquid refrigerant pipe 30a. A first gas cutoff valve 36a serving as an opening / closing device is provided in the middle of the first gas refrigerant pipe 32a. The first liquid cutoff valve 34a is provided upstream of the chamber A of the first liquid refrigerant pipe 30a, and the first gas cutoff valve 36a is provided upstream of the chamber A of the first gas refrigerant pipe 32a. A second liquid cutoff valve 34b and a third liquid cutoff valve 34c are provided as opening / closing devices in the middle of the second liquid refrigerant pipe 30b. A second gas cutoff valve 36b and a third gas cutoff valve 36c are provided as opening / closing devices in the middle of the second gas refrigerant pipe 32b.

[0022] The second liquid cutoff valve 34b is provided upstream of the chamber D of the second liquid refrigerant pipe 30b, and the second gas cutoff valve 36b is provided upstream of the chamber D of the second gas refrigerant pipe 32b. The third liquid shutoff valve 34c is provided on the second liquid refrigerant piping 30b upstream of room E and downstream of room D, and the third gas shutoff valve 36c is provided on the second gas refrigerant piping 32b upstream of room E and downstream of room D.

[0023] Further, each indoor unit 20 is provided with a refrigerant leakage sensor 40. The refrigerant leakage sensor 40 detects refrigerant leaking from each indoor unit 20, and in this embodiment, is provided inside each indoor unit 20. The refrigerant leakage sensor 40 may be provided outside the indoor unit 20, or may be provided on a remote control (not shown) for operating the indoor unit 20 installed in the room, or at a predetermined location inside the room separately from the indoor unit 20. Each indoor unit 20 is provided with a display unit 42 that performs a predetermined display and is composed of, for example, a liquid crystal display device, etc. The display unit 42 may be provided directly on the indoor unit 20, or may be provided on, for example, a remote control.

[0024] Next, the control configuration of this embodiment will be described. FIG. 2 is a block diagram showing a control configuration of this embodiment. 2, the air conditioner 1 includes a centralized controller 50 as a control device. The centralized controller 50 includes a display unit 52, for example a liquid crystal display device, for displaying the status of each indoor unit 20.

[0025] The centralized controller 50 is equipped with a processor such as a CPU or MPU that executes programs, and memory such as a ROM or RAM, and performs various processes through cooperation between hardware and software, such as the processor reading out control programs stored in the memory and executing processing. The central controller 50 controls the compressor 11, the blower 12, and the expansion valve 13 of the outdoor unit 10, and the blower 21 and the expansion valve 22 of the indoor unit 20, based on a control program.

[0026] The centralized controller 50 controls the opening and closing of the first liquid shut-off valve 34a, the second liquid shut-off valve 34b, the third liquid shut-off valve 34c, the first gas shut-off valve 36a, the second gas shut-off valve 36b and the third gas shut-off valve 36c based on the detection signal of the refrigerant leakage sensor 40 of each indoor unit 20. In addition, the centralized controller 50 is configured to display a predetermined message on the display 42 of each indoor unit 20 and the display 52 of the centralized controller 50 when controlling the opening and closing of the first liquid shut-off valve 34a, the second liquid shut-off valve 34b, the third liquid shut-off valve 34c, the first gas shut-off valve 36a, the second gas shut-off valve 36b and the third gas shut-off valve 36c based on the detection signal of the refrigerant leakage sensor 40.

[0027] Next, the operation of this embodiment will be described with reference to the flowchart shown in FIG. In this embodiment, the centralized controller 50 determines whether or not all the liquid cutoff valves and the gas cutoff valves are "open" during operation (ST1). If it is determined that all are "open" (ST1: YES), the centralized controller 50 continues the cooling or heating operation.

[0028] Then, if the refrigerant leakage sensor 40 detects a refrigerant leakage (ST2: YES), the centralized controller 50 controls the liquid cut-off valve and gas cut-off valve corresponding to the indoor unit 20 in which the refrigerant leakage sensor 40 has detected a refrigerant leakage to be switched to "closed" based on the detection signal of the refrigerant leakage sensor 40 (ST3). For example, if a refrigerant leak is detected by the refrigerant leak sensor 40 of the indoor unit 20 in room A, the first liquid refrigerant shut-off valve 34a and the gas shut-off valve of the first liquid refrigerant piping 30a and the first gas refrigerant piping 32a, which flow refrigerant to the indoor unit 20 in room A, are each switched to "closed." As a result, refrigerant is no longer sent to the indoor units 20 in rooms B and C, and the centralized controller 50 controls the indoor units 20 in rooms B and C to operate only to blow air or to stop operation.

[0029] The central controller 50 turns on the blower 21 of the indoor unit 20 installed in the room where the refrigerant leaked (ST4). This makes it possible to agitate the air in the room where the refrigerant leaked.

[0030] Then, the centralized controller 50 displays on the display unit 52 of the centralized controller 50 that the indoor unit 20 in question from which the refrigerant has leaked (the indoor unit 20 in room A) is in a "refrigerant leaking state" (ST5). Furthermore, the centralized controller 50 displays "Refrigerant leakage state" and "Indoor unit in operable state present" on the display unit 42 of the indoor unit 20 in question where refrigerant leakage has occurred (the indoor unit 20 in room A) (ST6). Thereafter, the centralized controller 50 controls the indoor unit 20 in room A to stop operation (ST7).

[0031] If the refrigerant leakage sensor 40 does not detect a refrigerant leakage (ST2: NO), the centralized controller 50 determines whether or not all the liquid cutoff valves and the gas cutoff valves are "open" (ST1). In this embodiment, the first liquid cut-off valve 34a and the first gas cut-off valve 36a are controlled to be "closed" by the above-mentioned operation, so it is determined that all liquid cut-off valves and gas cut-off valves are not "open" (ST1: NO).

[0032] Then, the centralized controller 50 judges whether the corresponding liquid cutoff valve and gas cutoff valve (in this example, the first liquid cutoff valve 34a and the first gas cutoff valve 36a) are "closed" or not (ST8). If it is judged to be "closed" (ST8: YES), the centralized controller 50 displays on the display unit 52 of the centralized controller 50 that the corresponding indoor units 20 (the indoor units 20 in Room B and Room C) are in an "operation restricted state" (ST9).

[0033] Furthermore, the centralized controller 50 displays "operation restricted state" and "indoor unit present in operable state" on the display units 42 of the indoor units 20 (in this example, the indoor units 20 in rooms B and C) whose liquid cut-off valves and gas cut-off valves have been "closed" due to refrigerant leakage (ST10). Since no refrigerant is being sent to the indoor units 20 in rooms B and C, the centralized controller 50 controls the indoor units 20 in rooms B and C to switch to fan-only operation or to stop operation (ST11).

[0034] If it is determined that the corresponding liquid shutoff valve and gas shutoff valve are not “closed” (ST8: NO), the centralized controller 50 displays on the display unit 52 of the centralized controller 50 that the corresponding indoor unit 20 is “in an operable state” (ST12). That is, in this example, the first liquid shutoff valve 34a and the first gas shutoff valve 36a are closed, but the second liquid shutoff valve 34b, the second gas shutoff valve 36b, the third liquid shutoff valve 34c and the third gas shutoff valve 36c provided in the second liquid refrigerant piping 30b and the second gas refrigerant piping 32b are "open." Therefore, the display unit 52 of the centralized controller 50 displays that the indoor units 20 in Room D and Room E connected to the second liquid refrigerant piping 30b and the second gas refrigerant piping 32b are "operable."

[0035] The centralized controller 50 displays "operable state" and "indoor unit leaking refrigerant present" on the display units 42 of the corresponding indoor units 20 (in this example, the indoor units 20 in rooms D and E) (ST13). The indoor units 20 in rooms D and E continue to operate in the cooling or heating mode (ST14).

[0036] By controlling in this manner, if a refrigerant leak occurs in the indoor unit 20 in room A, the display unit 42 of the indoor unit 20 in room A will display "Refrigerant leaking state" and "Indoor unit 20 in operable state present", allowing the user of the indoor unit 20 in room A to recognize that there is a refrigerant leak and that there are other indoor units 20 that are operable (the indoor units 20 in rooms D and E).

[0037] Furthermore, the display units 42 of the indoor units 20 in rooms B and C display "Operation restricted state" and "Indoor units in an operable state (indoor units 20 in rooms D and E)," allowing users of the indoor units 20 in rooms B and C to recognize that due to a refrigerant leak in another indoor unit 20, the indoor units 20 are in a restricted state where they are only blowing air or are stopped from operating, and that there are other indoor units 20 that are operable (indoor units 20 in rooms D and E).

[0038] Furthermore, the display units 42 of the indoor units 20 in rooms D and E display "Operable" and "Indoor unit leaking refrigerant," allowing users of the indoor units 20 in rooms D and E to recognize that cooling, heating or fan operation is possible and that there is an indoor unit 20 leaking refrigerant (the indoor unit 20 in room A).

[0039] As described above, according to this embodiment, the system includes the shutoff valves 34, 36 (opening and closing devices) that are provided upstream of the indoor units 20 in the liquid refrigerant pipes 30a, 30b and the gas refrigerant pipes 32a, 32b and shut off the flow of refrigerant in the liquid refrigerant pipes 30a, 30b and the gas refrigerant pipes 32a, 32b, the refrigerant leakage sensor 40 that detects refrigerant leakage from the indoor units 20, and the centralized controller 50 (control device) that controls the opening and closing of the shutoff valves 34, 36 based on a detection signal from the refrigerant leakage sensor 40. The centralized controller 50 detects refrigerant leakage from the indoor units 20 using the refrigerant leakage sensor 40. When this is detected, the centralized controller 50 controls the opening / closing device located upstream of the indoor unit 20 to close, and when the opening / closing device located upstream of the indoor unit 20 is in the closed state and the refrigerant leakage sensor 40 of the indoor unit 20 detects refrigerant, the centralized controller 50 controls the indoor unit 20 to a refrigerant leakage state in which cooling operation or heating operation is stopped, and when the shutoff valves 34, 36 located upstream of the indoor unit 20 are in the closed state and the refrigerant leakage sensor 40 of the indoor unit 20 does not detect refrigerant, the centralized controller 50 controls the operation of the indoor unit 20 to fan operation or to an operation restricted state in which the operation is stopped.

[0040] As a result, if a refrigerant leak occurs in an indoor unit 20, the shutoff valves 34, 36 of the liquid refrigerant pipes 30a, 30b and the gas refrigerant pipes 32a, 32b are closed and operation is stopped, and the other indoor units 20 connected to the same liquid refrigerant pipes 30a, 30b and gas refrigerant pipes 32a, 32b are controlled to an operation restricted state, so that the other indoor units 20 can be operated in fan operation to prevent a decrease in comfort for users of the other indoor units 20.

[0041] Furthermore, according to this embodiment, if the shutoff valves 34, 36 located upstream of the indoor unit 20 are in an open state, the centralized controller 50 controls the operation to an operable state in which any one of cooling operation, heating operation, and fan operation is performed.

[0042] As a result, even if a refrigerant leak occurs in an indoor unit 20, the flow of refrigerant is not blocked in the other indoor units 20 connected to the other liquid refrigerant pipes 30a, 30b and the gas refrigerant pipes 32a, 32b that are not closed by the shut-off valves 34, 36, and any one of cooling operation, heating operation, or fan operation can be performed, thereby preventing a decrease in user comfort.

[0043] Furthermore, according to this embodiment, the centralized controller 50 is provided with a display unit 52 for checking the operating status of the indoor unit 20, and the centralized controller 50 causes the display unit 52 to display whether the indoor unit 20 is in a refrigerant leakage state, an operation restricted state, or an operational state.

[0044] Thereby, by having the centralized controller 50 display the state of the indoor units 20 on the display unit 52, whether they are in a refrigerant leakage state, an operation restricted state, or an operable state, the manager can recognize the indoor units 20 that cannot perform air conditioning operation, the indoor units 20 that cannot perform air conditioning operation but can perform fan operation, and the indoor units 20 that can perform air conditioning operation. As a result, after operation is stopped, the operating state can be promptly communicated to the users of the space in which each indoor unit 20 is located.

[0045] Furthermore, according to this embodiment, the multiple indoor units 20 are each equipped with a display unit 42, and the centralized controller 50 causes the display unit 42 of the indoor unit 20 in a refrigerant leaking state to indicate that it is in a refrigerant leaking state and that there is an indoor unit 20 in an operable state, the display unit 42 of the indoor unit 20 in an operation restricted state to indicate that it is in an operation restricted state and that there is an indoor unit 20 in an operable state, and the display unit 42 of the indoor unit 20 in an operation permitted state to indicate that it is in an operable state and that there is an indoor unit 20 in a refrigerant leaking state.

[0046] This allows users of the indoor units 20 to recognize which indoor units 20 are not capable of air conditioning operation and which indoor units 20 are capable of air conditioning operation. Also, since it is possible to recognize the occurrence of a refrigerant leak in the same refrigerant piping system or in other refrigerant piping systems, it is possible to notify users of a refrigerant leak state in multiple indoor units 20.

[0047] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit of the present invention. [Industrial Applicability]

[0048] As described above, the air conditioning apparatus of the present invention can be suitably used as an air conditioning apparatus in which multiple indoor units are connected to an outdoor unit, and if a refrigerant leak is detected in any of the indoor units, the refrigerant leak state, operating state, etc. can be recognized in the other indoor units. [Explanation of symbols]

[0049] 1. Air conditioning equipment 10 Outdoor unit 11 Compressor 12 Blower 13 Expansion valve 20 Indoor unit 21 Blower 22 Expansion valve 30 Liquid refrigerant piping 30a First liquid refrigerant piping 30b 2nd liquid refrigerant piping 32 Gas refrigerant piping 32a First gas refrigerant piping 32b Second gas refrigerant piping 34,36 Shut-off valve 34a First liquid shutoff valve 34b Second liquid shutoff valve 34c Third liquid shutoff valve 36a First gas shutoff valve 36b Second gas shutoff valve 36c Third gas shutoff valve 40 Refrigerant leak sensor 42 Display section 50 Centralized Controller 52 Display section

Claims

1. an outdoor unit having at least a compressor and a heat source side heat exchanger; A plurality of indoor units each having at least a utilization side heat exchanger and a blower; In an air conditioning apparatus including a liquid refrigerant pipe and a gas refrigerant pipe connecting the outdoor unit and the indoor unit, an opening and closing device that is provided upstream of the indoor unit in the liquid refrigerant piping and the gas refrigerant piping and that blocks the flow of refrigerant in the liquid refrigerant piping and the gas refrigerant piping; a refrigerant leakage sensor that detects leakage of a refrigerant from the indoor unit; a control device that controls the opening and closing of the opening and closing device based on a detection signal from the refrigerant leakage sensor, When the refrigerant leakage sensor detects a refrigerant leakage from the indoor unit, the control device controls the opening and closing device located upstream of the indoor unit to close, The air conditioning apparatus is characterized in that the control device controls the indoor unit to a refrigerant leakage state in which cooling operation or heating operation is stopped when the opening / closing device located upstream of the indoor unit is closed and the refrigerant leakage sensor of the indoor unit detects refrigerant, and controls the indoor unit to an operation restriction state in which operation is stopped, or to an air blowing operation, when the opening / closing device located upstream of the indoor unit is closed and the refrigerant leakage sensor of the indoor unit does not detect refrigerant.

2. The air-conditioning apparatus according to claim 1, characterized in that the control device controls the indoor unit to an operable state in which it performs any one of cooling operation, heating operation, and fan operation when the opening / closing device located upstream of the indoor unit is in an open state.

3. The control device is provided with a display unit for checking the operating state of the indoor unit, The air conditioner according to claim 2, wherein the control device causes the display unit to display whether the indoor unit is in a refrigerant leakage state, an operation restricted state, or an operable state.

4. Each of the indoor units is provided with a display unit, The air conditioning apparatus of claim 2 or 3, characterized in that the control device causes the display unit of the indoor unit in a refrigerant leaking state to display that it is in a refrigerant leaking state and that there is an indoor unit in an operable state, the display unit of the indoor unit in an operation restricted state to display that it is in an operation restricted state and that there is an indoor unit in an operable state, and the display unit of the indoor unit in an operation permitted state to display that it is in an operable state and that there is an indoor unit in a refrigerant leaking state.

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