Air conditioning system, program, and display method

Abstract

To provide an air conditioning system that can easily distinguish whether refrigerant leakage occurs, and whether an inspection of whether or not safety devices operate normally is performed.SOLUTION: An air conditioning system according to the present disclosure comprises safety devices for securing safety from refrigerant leakage, and a terminal device. The terminal device displays a first code if the refrigerant leakage occurs, and displays a second code different from the first code if an inspection of whether or not the safety devices operate normally is performed when the refrigerant leakage occurs.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to an air conditioning system, a program, and a display method. [Background technology]

[0002] Patent Document 1 discloses an air conditioning system having a refrigerant leak alarm device that issues an alarm using at least one of sound and light when a refrigerant leak is detected. Patent Document 1 discloses that a refrigerant leak sensor included in the refrigerant leak detection device outputs a test signal equivalent to the signal output when a refrigerant leak is detected, thereby checking whether the refrigerant leak detection device is operating. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-014959 Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure provides an air conditioning system, a program, and a display method that can easily distinguish whether a refrigerant leak has occurred or whether an inspection is being conducted to determine whether a safety device is operating normally. [Means for solving the problem]

[0005] The air conditioning system of the present disclosure includes a safety device for ensuring safety from refrigerant leakage and a terminal device, and the terminal device displays a first code when a refrigerant leakage occurs, and displays a second code different from the first code when an inspection is being performed to determine whether the safety device is operating normally when a refrigerant leakage occurs.

[0006] In addition, the program in the present disclosure causes the processor of the terminal device to function as a display control unit, and the display control unit displays a first code when a refrigerant leak has occurred, and displays a second code different from the first code when an inspection is being performed to determine whether a safety device for ensuring safety from a refrigerant leak is operating normally when a refrigerant leak has occurred.

[0007] In addition, the display method disclosed herein has a terminal device that displays a first code when a refrigerant leak has occurred, and displays a second code different from the first code when an inspection is being performed to determine whether a safety device for ensuring safety from a refrigerant leak is operating normally when a refrigerant leak has occurred. [Effects of the Invention]

[0008] The air conditioning system, program, and display method disclosed herein display a first code when a refrigerant leak has occurred, and a second code when a refrigerant leak has occurred and an inspection is being conducted to determine whether the safety device is operating normally. This makes it easy to distinguish between whether a refrigerant leak has occurred and whether an inspection is being conducted to determine whether the safety device is operating normally. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 shows a configuration of an air conditioning system according to a first embodiment. [Figure 2] FIG. 1 is a diagram showing the configuration of a control system of an outdoor unit according to a first embodiment. [Figure 3] FIG. 1 is a diagram showing the configuration of a control system of an indoor unit according to the first embodiment. [Figure 4] FIG. 1 is a diagram showing the configuration of a control system for a shutoff valve in the first embodiment. [Figure 5] FIG. 1 is a diagram showing the configuration of a control system of an indoor unit remote control according to the first embodiment. [Figure 6] FIG. 1 shows the configuration of a control system of an alarm device according to a first embodiment. [Figure 7] FIG. 1 shows a configuration of a control system of a centralized management device according to a first embodiment. [Figure 8]FIG. 10 is a diagram showing an example of an inspection screen according to the first embodiment. [Figure 9] FIG. 1 is a sequence diagram showing the operation of each part of the air conditioning system according to the first embodiment. [Figure 10] FIG. 10 is a diagram showing an example of an inspection screen according to the first embodiment. [Figure 11] FIG. 10 is a diagram showing an example of an inspection screen according to the first embodiment. [Figure 12] FIG. 1 is a sequence diagram showing the operation of each part of the air conditioning system according to the first embodiment. [Figure 13] FIG. 10 is a diagram showing an example of an inspection screen according to the first embodiment. [Figure 14] FIG. 1 is a sequence diagram showing the operation of each part of the air conditioning system according to the first embodiment. [Figure 15] FIG. 10 is a diagram showing an example of an inspection screen according to the first embodiment. [Figure 16] FIG. 1 is a sequence diagram showing the operation of each part of the air conditioning system according to the first embodiment. [Figure 17] FIG. 1 is a sequence diagram showing the operation of each part of the air conditioning system according to the first embodiment. [Figure 18] FIG. 1 is a sequence diagram showing the operation of each part of the air conditioning system according to the first embodiment. [Figure 19] FIG. 1 is a sequence diagram showing the operation of each part of the air conditioning system according to the first embodiment. [Figure 20] FIG. 10 is a diagram showing the configuration of an air conditioning system according to a second embodiment. [Figure 21] FIG. 10 is a diagram showing an example of an inspection screen in the second embodiment. [Figure 22] FIG. 10 is a diagram showing the configuration of an air conditioning system according to a third embodiment. [Figure 23] FIG. 10 is a diagram showing the configuration of an air conditioning system according to a fourth embodiment. [Figure 24] FIG. 13 is a diagram showing an example of an inspection screen in the fourth embodiment. [Figure 25] FIG. 10 is a diagram showing the configuration of an air conditioning system according to a fifth embodiment. [Figure 26] FIG. 13 is a diagram showing an example of an inspection screen in the fifth embodiment. [Figure 27] FIG. 20 is a diagram showing an example of an inspection screen in the seventh embodiment. [Figure 28] FIG. 20 is a diagram showing an example of an inspection screen in the eighth embodiment. [Figure 29] FIG. 20 is a diagram showing an example of an inspection screen in the ninth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] (Findings that formed the basis of this disclosure) At the time the inventors arrived at the idea of this disclosure, inspections were performed to determine whether a safety device would operate normally in the event of a refrigerant leak, as in the refrigerant leak warning device described in Patent Document 1. However, the inventors discovered a problem in that, in conventional inspections, the safety device behaves in a way that assumes a refrigerant leak has occurred, making it difficult to distinguish whether a refrigerant leak has occurred or whether an inspection is being performed. To solve this problem, the inventors came up with the subject matter of the present disclosure. Therefore, the present disclosure provides an air conditioning system, a program, and a display method that can easily distinguish whether a refrigerant leak has occurred or whether an inspection is being conducted to check whether a safety device is operating normally.

[0011] Hereinafter, embodiments will be described in detail with reference to the drawings. However, in some cases, more detailed explanation than necessary may be omitted. For example, detailed explanation of already well-known matters or redundant explanation of substantially the same configuration may be omitted. The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

[0012] (Embodiment 1) [1-1.Configuration] [1-1-1. Air conditioning system configuration] The air conditioning system 1000 is a system that conditions the air in a space S to be air-conditioned. The air conditioning system 1000 is applied to facilities such as buildings and schools. The space S to be air-conditioned is a room in the facility.

[0013] The air conditioning system 1000 of this embodiment has two refrigerant systems RS, ie, refrigerant systems RS1 and RS2.

[0014] Refrigerant system RS1 is a refrigerant system RS configured with an outdoor unit 1A, two indoor units 2, indoor units 2A and 2B, and two shutoff valves 3, 3A and 3B. That is, the refrigerant system RS1 includes the outdoor unit 1A, the indoor units 2A and 2B, and the shutoff valves 3A and 3B. The outdoor unit 1A is installed outdoors in the facility. The indoor unit 2A is installed indoors in the facility and conditions the air-conditioned space S1. The indoor unit 2B is installed indoors in the facility and conditions the air-conditioned space S2. The outdoor unit 1A and the indoor units 2A and 2B are connected by refrigerant piping RP1. In the refrigerant piping RP1, a shutoff valve 3A is provided between the outdoor unit 1A and the indoor unit 2A to shut off the flow of refrigerant between the outdoor unit 1A and the indoor unit 2B. In addition, a shutoff valve 3B that shuts off the flow of refrigerant between the outdoor unit 1A and the indoor unit 2B is provided in the refrigerant piping RP1 between the outdoor unit 1A and the indoor unit 2B.

[0015] The air conditioning system 1000 includes an indoor unit remote control 4A arranged in the conditioned space S1. The indoor unit remote control 4A is a remote control for making various settings for the indoor unit 2A, such as setting the set temperature. The indoor unit remote control 4A is connected to the indoor unit 2A by a remote control wiring RL, and is also connected to the shutoff valve 3A via the indoor unit 2A by the remote control wiring RL. The air conditioning system 1000 also includes a detection alarm 5A disposed in the air-conditioned space S1. The detection alarm 5A is connected to the indoor unit remote control 4A via the indoor unit 2A by a remote control wiring RL.

[0016] The air conditioning system 1000 includes an indoor unit remote control 4B arranged in the conditioned space S2. The indoor unit remote control 4B is a remote control for making various settings for the indoor unit 2B, such as setting the set temperature. The indoor unit remote control 4B is connected to the indoor unit 2B by a remote control wiring RL, and is also connected to the shutoff valve 3B via the indoor unit 2B by the remote control wiring RL. The air conditioning system 1000 also includes a detection alarm 5B disposed in the conditioned space S2. The detection alarm 5B is connected to the indoor unit remote control 4B via the indoor unit 2B by a remote control wiring RL.

[0017] The refrigerant system RS2 is a refrigerant system RS configured with an outdoor unit 1B, two indoor units 2, indoor units 2C and 2D, and two shutoff valves 3, 3C and 3D. That is, the refrigerant system RS2 includes the outdoor unit 1B, the indoor units 2C and 2D, and the shutoff valves 3C and 3D. The outdoor unit 1B is installed outdoors in the facility. The indoor unit 2C is installed indoors in the facility and conditions the air-conditioned space S3. The indoor unit 2D is installed indoors in the facility and conditions the air-conditioned space S4. The outdoor unit 1B and the indoor units 2C and 2D are connected by a refrigerant piping RP2. A shutoff valve 3C is provided in the refrigerant piping RP2 between the outdoor unit 1B and the indoor unit 2C to shut off the flow of refrigerant between the outdoor unit 1B and the indoor unit 2C. Furthermore, in the refrigerant piping RP2, a shutoff valve 3D is provided between the outdoor unit 1B and the indoor unit 2D to shut off the flow of refrigerant between the outdoor unit 1B and the indoor unit 2D.

[0018] The air conditioning system 1000 includes an indoor unit remote control 4C arranged in the conditioned space S3. The indoor unit remote control 4C is a remote control for making various settings for the indoor unit 2C, such as setting the set temperature. The indoor unit remote control 4C is connected to the indoor unit 2C by a remote control wiring RL, and is also connected to the shutoff valve 3C via the indoor unit 2C by the remote control wiring RL. The air conditioning system 1000 also includes a detection alarm 5C disposed in the conditioned space S3. The detection alarm 5C is connected to the indoor unit remote control 4C via the indoor unit 2C by a remote control wiring RL.

[0019] The air conditioning system 1000 includes an indoor unit remote control 4D arranged in the conditioned space S4. The indoor unit remote control 4D is a remote control for making various settings for the indoor unit 2D, such as setting the set temperature. The indoor unit remote control 4D is connected to the indoor unit 1D by a remote control wiring RL, and is also connected to the shutoff valve 3D via the indoor unit 1D by the remote control wiring RL. The air conditioning system 1000 also includes a detection alarm 5D disposed in the conditioned space S2. The detection alarm 5D is connected to the indoor unit remote control 4D via the indoor unit 2D by a remote control wiring RL.

[0020] In the following description, when there is no need to distinguish between the outdoor units 1A and 1B, they will be referred to as "outdoor unit 1" with the reference number "1" added. In the following description, when there is no need to distinguish between the indoor unit remote controls 4A, 4B, 4C, and 4D, they will be referred to as "indoor unit remote controls 4" with the reference numeral "4" added. Furthermore, in the following description, when there is no need to distinguish between the detection alarm devices 5A, 5B, 5C, and 5D, they will be referred to as "detection alarm device 5" with the reference number "5" added. The detection alarm 5 is an example of an "alarm device."

[0021] Here, the shutoff valve 3 and the detection alarm 5 will be briefly described. The shutoff valve 3 is a device that can switch between an open state in which the refrigerant flows and a closed state in which the flow of the refrigerant is blocked. The shutoff valve 3 closes in the event of a refrigerant leak. This enables the shutoff valve 3 to ensure the safety of users of the air-conditioned space S from the refrigerant leak in the event of a refrigerant leak. The detection alarm 5 is an alarm equipped with a refrigerant leak sensor 54. The detection alarm 5 sounds an alarm by buzzer in the event of a refrigerant leak. This makes it possible for the detection alarm 5 to ensure the safety of users of the air-conditioned space S from a refrigerant leak in the event of a refrigerant leak. In the following explanation, an alarm that does not have a refrigerant leak sensor 54 will be referred to simply as an "alarm" to distinguish it from the detection alarm 5.

[0022] In other words, the shutoff valve 3 and the detection alarm 5 can be said to be safety devices that ensure safety from refrigerant leakage. Therefore, in the following description, when there is no need to distinguish between the shutoff valve 3 and the detection alarm 5, they will be referred to as the "safety device 6" by adding the reference number "6." The safety device 6 performs a safety ensuring operation to ensure safety from refrigerant leakage. The safety ensuring operation performed by the shutoff valve 3 is to cut off the flow of refrigerant. The safety ensuring operation performed by the detection alarm 5 is to issue an alarm.

[0023] As shown in Fig. 1, the air conditioning system 1000 includes a centralized control device 7. The centralized control device 7 is a device that centrally controls the outdoor unit 1, the indoor unit 2, and the shutoff valve 3. The centralized control device 7 can also be called a control device because it also controls the indoor unit 1 and the indoor unit 2. The centralized control device 7 is installed, for example, inside a facility, in a control room that manages the facility. The centralized control device 7 is an example of a "control device."

[0024] The centralized control device 7 of this embodiment is communicatively connected to the outdoor unit 1A and the indoor units 2A and 2B via a communication line CL1. The centralized control device 7 of this embodiment is communicatively connected to the outdoor unit 1B and the indoor units 2C and 2D via a communication line CL2.

[0025] In the following description, when there is no need to distinguish between the indoor unit remote controllers 4 and the centralized control device 7, the reference numeral "8" will be added and they will be referred to as "terminal devices 8."

[0026] In the air conditioning system 1000 of this embodiment, four remote control wiring groups GP, namely, remote control wiring groups GP1, GP2, GP3, and GP4, are formed. A remote control wiring group GP is a group of units connected by a remote control wiring RL. More specifically, the remote control wiring group GP in this embodiment is a group that includes the indoor unit 2 and devices that are connected to the indoor unit 2 by the remote control wiring RL. The remote control wiring group GP1 includes an indoor unit 2A, a shutoff valve 3A, an indoor unit remote control 4A, and a detection alarm 5A. The remote control wiring group GP2 includes an indoor unit 2B, a shutoff valve 3B, an indoor unit remote control 4B, and a detection alarm 5B. The remote control wiring group GP3 includes an indoor unit 2C, a shutoff valve 3C, an indoor unit remote control 4C, and a detection alarm 5C. The remote control wiring group GP4 includes an indoor unit 2D, a shutoff valve 3D, an indoor unit remote control 4D, and a detection alarm 5D. The remote control wiring group GP is an example of a "predetermined group."

[0027] Meanwhile, in the air conditioning system 1000, an inspector performs an inspection. In the present disclosure, inspection refers to an inspection of whether the safety device 6 operates normally in the event of a refrigerant leak. This inspection is also called a circuit inspection. In this inspection, the inspector checks whether the shutoff valve 3 is closed, whether the detection alarm 5 or alarm has sounded an alarm, whether the indoor unit 2 is operating as a fan, and so on, in each air-conditioned space S. As will be explained later, in the air conditioning system 1000, inspection can be performed in units of remote control wiring group GP. This allows the inspector to inspect the desired safety device 6, resulting in efficient inspection.

[0028] Next, the configuration of the control system of the outdoor unit 1, indoor unit 2, shutoff valve 3, indoor unit remote controller 4, detection alarm 5, and centralized control device 7 will be described.

[0029] [1-1-2.Outdoor unit configuration] First, the configuration of the control system of the outdoor unit 1 will be described. FIG. 2 is a diagram showing the configuration of a control system of the outdoor unit 1. As shown in FIG. The outdoor unit 1 includes an outdoor unit control unit 10 and an outdoor unit communication unit 11.

[0030] Before describing the outdoor unit control unit 10, the outdoor unit communication unit 11 will be described. The outdoor unit communication unit 11 is equipped with communication hardware such as a communication circuit that complies with a predetermined communication standard, and communicates with the indoor units 2 and the centralized control device 7 under the control of the outdoor unit control unit 10. The outdoor unit communication unit 11 of the outdoor unit 1A communicates with the indoor units 2A and 2B and the centralized control device 7 via a communication line CL1. The outdoor unit communication unit 11 of the outdoor unit 1B communicates with the indoor units 2C and 2D and the centralized control device 7 via a communication line CL2.

[0031] The outdoor unit control unit 10 includes a processor 100 such as a CPU (Central Processing Unit) or an MPU (Micro Processor Unit), a memory 120, and an interface circuit for connecting other devices and sensors. Although not shown, this interface circuit included in the outdoor unit control unit 10 is connected to various devices included in the outdoor unit 1, such as a compressor, an outdoor blower fan, and various sensors.

[0032] The memory 120 is a storage device that stores programs and data. The memory 120 stores a control program 121 and data to be processed by the processor 100. The memory 120 has a non-volatile storage area. The memory 120 also has a volatile storage area and constitutes a work area for the processor 100. The memory 120 is constituted by, for example, a ROM (Read Only Memory) or a RAM (Random Access Memory).

[0033] The outdoor unit control unit 10 controls each part of the outdoor unit 1 and performs various operations by having the processor 100 read and execute a control program 121 stored in the memory 120. The outdoor unit control unit 10 communicates with the indoor units 2 and the centralized control device 7 via the outdoor unit communication unit 11, details of which will be described later.

[0034] [1-1-3. Indoor unit configuration] Next, the configuration of the control system of the indoor unit 2 will be described. FIG. 3 is a diagram showing the configuration of the control system of the indoor unit 2. As shown in FIG. The indoor unit 2 includes an indoor unit control unit 20, a first indoor unit communication unit 21, a second indoor unit communication unit 22, an indoor blower fan 23, and an indoor expansion valve 24.

[0035] Before describing the indoor unit control unit 20, the first indoor unit communication unit 21, the second indoor unit communication unit 22, and the indoor blower fan 23 will be described. The first indoor unit communication unit 21 is equipped with communication hardware such as a communication circuit that complies with a predetermined communication standard, and communicates with the outdoor unit 1 and the centralized control device 7 that belong to the same refrigerant system RS in accordance with the control of the indoor unit control unit 20. The first indoor unit communication unit 21 of the indoor units 2A and 2B communicates with the outdoor unit 1A and the centralized control device 7. The first indoor unit communication unit 21 of the indoor units 2C and 2D communicates with the outdoor unit 1B and the centralized control device 7.

[0036] The second indoor unit communication unit 22 is equipped with communication hardware such as a communication circuit that complies with a predetermined communication standard, and communicates with each device connected to the indoor unit 2 via the remote control wiring RL in accordance with the control of the indoor unit control unit 20. The second indoor unit communication unit 22 of the indoor unit 2A communicates with the shutoff valve 3A, indoor unit remote control 4A, and detection alarm 5A. The second indoor unit communication unit 22 of the indoor unit 2B communicates with the shutoff valve 3B, indoor unit remote control 4B, and detection alarm 5B. The second indoor unit communication unit 22 of the indoor unit 2C communicates with the shutoff valve 3C, indoor unit remote control 4C, and detection alarm 5C. The second indoor unit communication unit 22 of the indoor unit 2D communicates with the shutoff valve 3D, indoor unit remote control 4D, and detection alarm 5D.

[0037] The indoor blower fan 23 rotates under the control of the indoor unit control unit 20 and sends air to a heat exchanger provided in the indoor unit 2. The indoor expansion valve 24 is a valve that adjusts the flow rate of refrigerant to a heat exchanger provided in the indoor unit 2. The opening degree of the indoor expansion valve 24 is adjusted under the control of the indoor unit control unit 20.

[0038] The indoor unit control unit 20 comprises a processor 200 such as a CPU or MPU, a memory 220, and an interface circuit for connecting other devices and sensors. Although not shown, this interface circuit provided in the indoor unit control unit 20 is connected to various devices provided in the indoor unit 2, such as a temperature sensor.

[0039] The memory 220 is a storage device that stores programs and data. The memory 220 stores a control program 221 and data to be processed by the processor 200. The memory 220 has a non-volatile storage area. The memory 220 also has a volatile storage area, and constitutes a work area for the processor 200. The memory 220 is constituted by, for example, a ROM or a RAM.

[0040] The indoor unit control unit 20 controls each part of the indoor unit 2 and performs various operations by having the processor 200 read and execute a control program 221 stored in the memory 220. Although details will be described later, the indoor unit control unit 20 communicates with the outdoor units 1 and the centralized control device 7 that belong to the same refrigerant system RS via a first indoor unit communication unit 21. The indoor unit control unit 20 also communicates with the indoor unit 2 and each device connected by a remote control wiring RL via a second indoor unit communication unit 22. The indoor unit control unit 20 also controls the operation of the indoor unit 2 by controlling mechanisms related to air conditioning such as the indoor blower fan 23 and the indoor expansion valve 24. Furthermore, when the indoor unit control unit 20 receives a notification from the detection alarm 5 that a refrigerant leak has occurred, it transmits that notification to each device in the same remote control wiring group GP and to the centralized control device 7.

[0041] [1-1-4. Configuration of shutoff valve] Next, the configuration of the control system for the shutoff valve 3 will be described. FIG. 4 is a diagram showing the configuration of a control system for the shutoff valve 3. As shown in FIG. The shutoff valve 3 includes a shutoff valve control unit 30 , a shutoff valve communication unit 31 , a shutoff unit 32 , and a notification unit 33 .

[0042] Before describing the shutoff valve control unit 30, the shutoff valve communication unit 31, the shutoff unit 32, and the notification unit 33 will be described. The shutoff valve communication unit 31 includes communication hardware such as a communication circuit that complies with a predetermined communication standard, and communicates with the indoor unit 2 connected via the remote control wiring RL according to the control of the shutoff valve control unit 30.

[0043] The shutoff unit 32 shuts off the flow of refrigerant in the refrigerant pipe RP. The shutoff unit 32 includes an on-off valve such as a solenoid valve or an electric valve, and switches the state of the on-off valve between an open state and a closed state under the control of the shutoff valve control unit 30.

[0044] The notification unit 33 notifies predetermined content. The notification unit 33 includes an LED (Light Emitting Diode), and according to the control of the shutoff valve control unit 30, lights up the LED to notify predetermined content.

[0045] The shutoff valve control unit 30 includes a processor 300 such as a CPU or an MPU, a memory 320, and an interface circuit for connecting other devices and sensors.

[0046] The memory 320 is a storage device that stores programs and data. The memory 320 stores a control program 321 and data to be processed by the processor 300. The memory 320 has a non-volatile storage area. The memory 320 also has a volatile storage area and constitutes a work area for the processor 300. The memory 320 is constituted by, for example, a ROM or a RAM.

[0047] The shutoff valve control unit 30 controls each part of the shutoff valve 3 and performs various operations by having the processor 300 read and execute a control program 321 stored in the memory 320. Although details will be described later, the shutoff valve control unit 30 communicates with the indoor unit 2 connected to the remote control wiring RL via the shutoff valve communication unit 31. Furthermore, the shutoff valve control unit 30 sets the open / closed state of the shutoff valve 3 to the open state by opening the on-off valve of the shutoff unit 32, and sets the open / closed state of the shutoff valve 3 to the closed state by closing the on-off valve of the shutoff unit 32. Furthermore, when the shutoff valve control unit 30 sets the open / closed state of the shutoff valve 3 to the closed state, the notification unit 33 notifies that the open / closed state of the shutoff valve 3 is in the closed state. Note that it is also possible to notify the open / closed state of the shutoff valve 3, but to notify that the shutoff valve control unit 30 has issued an open / close command.

[0048] [1-1-5. Configuration of indoor unit remote control] Next, the configuration of the control system of the indoor unit remote control 4 will be described. FIG. 5 is a diagram showing the configuration of a control system of the indoor unit remote control 4. As shown in FIG. The indoor unit remote control 4 includes a remote control control unit 40, a remote control communication unit 41, a remote control display unit 42, and a remote control operation unit 43.

[0049] Before describing the remote control unit 40, the remote control communication unit 41, the remote control display unit 42, and the remote control operation unit 43 will be described. The remote control communication unit 41 includes communication hardware such as a communication circuit that complies with a predetermined communication standard, and communicates with the indoor unit 2 connected via the remote control wiring RL under the control of the remote control control unit 40.

[0050] The remote control display unit 42 includes an LED and a display, and displays various information on the LED and the display according to the control of the remote control control unit 40.

[0051] The remote control operation unit 43 has a plurality of operation keys for receiving various instructions from the user, and outputs a signal corresponding to the operated operation key to the remote control control unit 40.

[0052] The remote control unit 40 includes a processor 400 such as a CPU or MPU, a memory 420, and an interface circuit for connecting other devices and sensors.

[0053] The memory 420 is a storage device that stores programs and data. The memory 420 stores a control program 421 and data to be processed by the processor 400. The memory 420 has a non-volatile storage area. The memory 420 also has a volatile storage area and constitutes a work area for the processor 400. The memory 420 is constituted by, for example, a ROM or a RAM.

[0054] The remote control control unit 40 reads and executes a control program 421 stored in the memory 420 to control each unit of the indoor unit remote control 4 and perform various operations. Although details will be described later, the remote control control unit 40 communicates with the indoor unit 2 via a remote control communication unit 41. The remote control control unit 40 also displays various information on a remote control display unit 42. The remote control control unit 40 also receives various instructions from the user based on signals output by a remote control operation unit 43.

[0055] [1-1-6. Configuration of detector alarm] Next, the configuration of the control system of the detection alarm device 5 will be described. FIG. 6 is a diagram showing the configuration of the control system of the detection alarm device 5. The detection alarm 5 comprises an alarm control unit 50, an alarm communication unit 51, an alarm issuing unit 52, an alarm operation unit 53, and a refrigerant leak sensor .

[0056] Before describing the alarm control unit 50, the alarm communication unit 51, alarm issuing unit 52, alarm operating unit 53, and refrigerant leak sensor 54 will be described. The alarm communication section 51 comprises communication hardware such as a communication circuit that complies with a predetermined communication standard, and communicates with the indoor unit 2 connected via the remote control wiring RL under the control of the alarm control section 50.

[0057] The alarm issuing unit 52 includes an LED and a buzzer, and issues an alarm by lighting up the LED and outputting a sound from the buzzer.

[0058] The alarm operation unit 53 has a plurality of operation keys that accept various instructions from the user. The alarm operation unit 53 outputs a signal corresponding to the operated operation key to the alarm control unit 50.

[0059] The refrigerant leak sensor 54 is a sensor that detects the occurrence of a refrigerant leak. When the refrigerant leak sensor 54 detects the occurrence of a refrigerant leak, it outputs a signal indicating that a refrigerant leak has been detected to the alarm control unit 50.

[0060] The alarm control unit 50 comprises a processor 500 such as a CPU or MPU, a memory 520, and an interface circuit for connecting other devices and sensors.

[0061] The memory 520 is a storage device that stores programs and data. The memory 520 stores a control program 521 and data to be processed by the processor 500. The memory 520 has a non-volatile storage area. The memory 520 also has a volatile storage area and constitutes a work area for the processor 500. The memory 520 is constituted by, for example, a ROM or a RAM.

[0062] The alarm control unit 50 reads out and executes a control program 521 stored in the memory 520, thereby controlling each part of the detection alarm 5 and carrying out various operations. Although details will be given later, the alarm control unit 50 communicates with the indoor unit 2 via an alarm communication unit 51. The alarm control unit 50 also issues an alarm using an alarm issuing unit 52. The alarm control unit 50 also accepts various instructions from the user based on signals output by an alarm operation unit 53. When the alarm control unit 50 receives a signal from a refrigerant leak sensor 54, it determines that a refrigerant leak has occurred and sends a message to the indoor unit 2 that a refrigerant leak has occurred.

[0063] [1-1-7. Configuration of centralized control device] Next, the configuration of the centralized control device 7 will be described. FIG. 7 is a diagram showing the configuration of the control system of the centralized control device 7. As shown in FIG. The centralized control device 7 includes a management control unit 70 , a management communication unit 71 , and a touch panel 72 .

[0064] Before describing the management control unit 70, the management communication unit 71 and the touch panel 72 will be described. The management communication unit 71 includes communication hardware such as a communication circuit that complies with a predetermined communication standard, and communicates with the outdoor unit 1 and the indoor unit 2 under the control of the management control unit .

[0065] The touch panel 72 includes a display and a touch sensor that is provided over the display or is integral with the display.

[0066] The management control unit 70 includes a processor 700 such as a CPU or MPU, a memory 720, and an interface circuit for connecting with other devices and sensors.

[0067] The memory 720 is a storage device that stores programs and data. The memory 720 stores a control program 721, management data 722, and data to be processed by the processor 700. The memory 720 has a non-volatile storage area. The memory 720 also has a volatile storage area and constitutes a work area for the processor 700. The memory 720 is constituted by, for example, a ROM or a RAM.

[0068] The management data 722 has a record R for each remote control wiring group GP formed in the air conditioning system 1000. In this embodiment, four remote control wiring groups GP are formed in the air conditioning system 1000. Therefore, in this embodiment, four records R are stored in the management data 722.

[0069] Record R records first address information for communicating with the indoor units 2 included in the remote control wiring group GP, second address information for communicating with the outdoor units 1 included in the remote control wiring group GP, the number assigned to the remote control wiring group GP, the name of the remote control wiring group GP, the inspection date and time, the open / closed state of the shut-off valves 3 included in the remote control wiring group GP, and whether or not a refrigerant leak has occurred.

[0070] In the record R, first address information is recorded for each of the indoor units 2 included in the remote control wiring group GP. In the record R, the second address information is recorded for each of the outdoor units 1 included in the remote control wiring group GP.

[0071] The name of the remote control wiring group GP is composed of a combination of a character or character string indicating the type of refrigerant system RS and a character or character string indicating the type of remote control wiring group GP. For example, the name of the remote control wiring group GP is "Adp1-1 In01." In this example name, "Adp1-1" indicates the type of refrigerant system RS, and "In01" indicates the type of remote control wiring group GP.

[0072] The inspection date and time is the date and time when the inspection was performed. The inspection date and time is a date and time indicated by a combination of year, month, day, hour, minute, and second. The inspection date and time recorded in record R is the date and time of the most recent inspection.

[0073] The presence or absence of refrigerant leakage indicates whether or not a refrigerant leakage has occurred. The presence or absence of refrigerant leakage recorded in the record R is appropriately updated by the management control unit 70 depending on whether or not a refrigerant leakage has occurred.

[0074] The management control unit 70 reads and executes a control program 721 stored in the memory 720 to control each unit of the centralized control device 7 and to perform various operations. As will be described in detail later, the management control unit 70 communicates with the outdoor unit 1 and the indoor unit 2 via the management communication unit 71. The management control unit 70 also updates the contents of the management data 722. The management control unit 70 also displays an inspection-related screen on the touch panel 72. Hereinafter, the inspection-related screen will be referred to as the "inspection screen" and will be denoted by the symbol "IG." The management control unit 70 also receives various instructions from the user via the inspection screen IG. The inspection screen IG corresponds to an example of a "screen."

[0075] [1-1-8. Inspection screen configuration] Next, the inspection screen IG will be described with reference to FIG. FIG. 8 is a diagram showing an example of the inspection screen IG.

[0076] The inspection screen IG has an object display area OA. The object display area OA is an area in which inspection-related objects OB are displayed one above the other for each remote control wiring group GP. The object display area OA displays the same number of inspection-related objects OB as the number of remote control wiring groups GP formed in the air conditioning system 1000. In other words, the object display area OA displays the same number of inspection-related objects OB as the number of records R contained in the management data 722.

[0077] An inspection-related object OB is an object related to inspection. The inspection-related object OB is generated and displayed corresponding to one record R. The inspection-related object OB has a check box CB, a first display area A1, a second display area A2, a third display area A3, a fourth display area A4, and a fifth display area A5.

[0078] The check box CB is an object for selecting the remote control wiring group GP on the inspection screen IG.

[0079] The first display area A1 is an area for displaying the number assigned to the remote control wiring group GP, and the number recorded in the corresponding record R.

[0080] The second display area A2 is an area for displaying the name of the remote control wiring group GP, and the name recorded in the corresponding record R.

[0081] The third display area A3 displays either the first code "P08", the character string "Running", or the second code "TP08". The first code, "P08," is displayed when a refrigerant leak occurs. The character string "In Progress" is displayed when an instruction to start inspection is given to the corresponding remote control wiring group GP. The second code "TP08" is displayed when an inspection is being performed on the corresponding remote control wiring group GP. The third display area A3 displays the first code "P08" when the refrigerant leakage occurrence status recorded in the corresponding record R indicates that a refrigerant leakage has occurred.

[0082] The fourth display area A4 is an area for displaying the inspection date and time. The fourth display area A4 displays the inspection date and time recorded in the corresponding record R.

[0083] The fifth display area A5 is an area that displays the open / closed state of the shutoff valve 3. When the shutoff valve 3 is in the open state, the fifth display area A5 displays the word "open." When the shutoff valve 3 is in the closed state, the fifth display area A5 displays the word "closed." The fifth display area A5 displays the open / closed state of the shutoff valve 3 that is recorded in the corresponding record R. It is also possible not to display the open / closed state of the shutoff valve 3, but to display that the shutoff valve control unit 30 has issued an open / close command.

[0084] The inspection screen IG displays a select all button B1 and a cancel selection button B2. The select all button B1 is a software button for checking all the check boxes CB displayed in the object display area OA. The deselect button B2 is a software button for changing a checked check box CB to an unchecked check box CB.

[0085] The inspection screen IG displays an inspection start button B3 and an inspection end button B4. The inspection start button B3 is a software button for issuing an inspection start instruction to start inspection. The inspection end button B4 is a software button for issuing an inspection end instruction to end the inspection.

[0086] When the inspection start button B3 is operated with the checkbox CB checked, the management control unit 70 receives an inspection start instruction for the remote control wiring group GP with the checkbox CB checked. Also, when the inspection end button B4 is operated with the checkbox CB checked, the management control unit 70 receives an inspection end instruction for the remote control wiring group GP with the checkbox CB checked.

[0087] In this way, the centralized control device 7 accepts inspection start instructions and inspection end instructions for each remote control wiring group GP via the inspection screen IG. If all check boxes CB are checked on the inspection screen IG, the centralized control device 7 accepts inspection start instructions and inspection end instructions for all remote control wiring groups GP included in all refrigerant systems RS. Also, if check boxes CB are checked on the inspection screen IG for all remote control wiring groups GP included in one refrigerant system RS, the centralized control device 7 accepts inspection start instructions and inspection end instructions for all remote control wiring groups GP included in one refrigerant system RS.

[0088] As described above, the centralized control device 7 can receive an inspection start instruction and an inspection end instruction via the inspection screen IG. On the other hand, while the safety device 6 is performing a safety ensuring operation, the centralized control device 7 cannot receive the three instructions, i.e., an operation end instruction, an alarm stop instruction, and a normal operation execution instruction, via the inspection screen IG. The operation end instruction is an instruction to end the safety ensuring operation. The alarm stop instruction is an instruction to stop the detection alarm 5 from issuing an alarm while the inspection operation is being performed. The normal operation execution instruction is an instruction to execute normal operation to the safety device 6. Normal operation of the safety device 6 means, in the case of the shutoff valve 3, changing the open / close state of the shutoff valve 3 to an open state, and in the case of the detection alarm 5, stopping the issuance of an alarm.

[0089] [1-2. Operation] Next, the operation of each part of the air conditioning system 1000 in this embodiment will be described.

[0090] [1-2-1. When starting inspection by operating the centralized control device] First, the operation of each part of the air conditioning system 1000 when an inspector starts inspection by operating the centralized control device 7 will be described.

[0091] FIG. 9 is a sequence diagram showing the operation of each part of the air conditioning system 1000. Figure 9 shows the operations of the outdoor unit 1, indoor unit 2, shutoff valve 3, detection alarm 5, and indoor unit remote control 4. The operation of the outdoor unit 1 shown in Figure 9 is the operation of the outdoor unit 1 that belongs to the same refrigerant system RS as the indoor unit 2 included in the remote control wiring group GP that was the inspection target. Furthermore, the operations of the indoor unit 2, shutoff valve 3, detection alarm 5, and indoor unit remote control 4 shown in Figure 9 are the operations of the indoor unit 2, shutoff valve 3, detection alarm 5, and indoor unit remote control 4 that are included in the remote control wiring group GP that was the inspection target.

[0092] When the inspection start button B3 is operated on the inspection screen IG, the management control unit 70 receives an inspection start instruction for the remote control wiring group GP whose check box CB is checked on the inspection screen IG (step SA1).

[0093] Next, the management control unit 70 changes the inspection date and time displayed in the fourth display area A4 for the inspection-related object OB whose check box CB is checked to the date and time when the inspection start button B3 is operated (step SA2). Note that in step SA2, the management data 722 is also updated. That is, the management control unit 70 updates the inspection date and time of the record R corresponding to the inspection-related object OB whose check box CB is checked to the date and time when the inspection start button B3 is operated.

[0094] Next, the management control unit 70 displays the character string "in progress" in the third display area A3 for the inspection-related object OB whose check box CB is checked (step SA3). Steps SA2 and SA3 may be performed simultaneously or in the reverse order.

[0095] FIG. 10 is a diagram showing an example of the inspection screen IG. 10 illustrates an example in which the inspection start button B3 is operated when the check boxes CB of the inspection-related objects OB1 and OB2 out of the four inspection-related objects OB are checked. Also, FIG. 10 illustrates an example in which the inspection start button B3 is operated at 12:00:00 on August 8, 2024.

[0096] As shown in Figure 10, when the check boxes CB of the inspection-related objects OB1 and OB2 are checked and the inspection start button B3 is operated, the fourth display area A4 of the inspection-related objects OB1 and OB2 changes the inspection date and time displayed to the date and time when the inspection start button B3 was operated. Also, as shown in Figure 10, when the check boxes CB of the inspection-related objects OB1 and OB2 are checked and the inspection start button B3 is operated, the third display area A3 of the inspection-related objects OB1 and OB2 displays the string "In Progress."

[0097] Returning to the explanation of the sequence diagram in Fig. 9, the management control unit 70 transmits an inspection start signal indicating the start of inspection to the indoor units 2 (step SA4). The indoor units 2 that are the transmission destinations in step SA4 are all indoor units 2 included in the remote control wiring group GP selected on the inspection screen IG.

[0098] In step SA4, the management control unit 70 reads the record R of the remote control wiring group GP selected on the inspection screen IG from the management data 722, reads the first address information from the read record R, and transmits an inspection start signal based on the read first address information.

[0099] When the indoor unit control unit 20 receives the inspection start signal from the centralized control device 7, it transmits the inspection start signal to the indoor unit remote controller 4 and the detection alarm 5 via the second indoor unit communication unit 22 (step SA5).

[0100] When the remote control control unit 40 receives the inspection start signal from the indoor unit 2, it causes the remote control display unit 42 to display that an inspection is being performed (step SA6).

[0101] When the alarm control unit 50 receives the inspection start signal from the indoor unit 2, it causes the alarm unit 52 to issue an alarm (step SA7).

[0102] Next, the alarm control unit 50 transmits a pseudo leak signal to the indoor unit 2 (step SA8). The pseudo leak signal is a signal indicating that the detection alarm 5A has sounded an alarm on the assumption that a refrigerant leak has occurred.

[0103] When the indoor unit control section 20 receives the pseudo leakage signal from the detection alarm device 5, it drives the indoor blower fan 23 to start the blowing operation (step SA9).

[0104] Next, the indoor unit control section 20 transmits a pseudo leakage signal to the outdoor unit 1 via the first indoor unit communication section 21 (step SA10).

[0105] When the outdoor unit control unit 10 receives the pseudo leak signal from the indoor unit 2, it changes the state of the outdoor unit 1 from a normal operation possible state to a normal operation impossible state (step SA11). The normal operation possible state is a state in which the air-conditioned space S can be air-conditioned by operating the indoor unit remote control 4 or by instructions from the centralized control device 7. The normal operation impossible state is a state in which the air-conditioned space S cannot be air-conditioned. Note that, in an inspection targeting some remote control wiring groups GP of the refrigerant system RS, the processing of step SA11 is omitted. In other words, the outdoor unit 1 does not enter a normal operation impossible state during this inspection. Furthermore, in an inspection targeting all remote control wiring groups GP of the refrigerant system RS, the outdoor unit 1 enters a normal operation impossible state, but once the inspection of one remote control wiring group GP of the refrigerant system RS is completed, the outdoor unit 1 returns to a normal operation possible state. Furthermore, a comparison is made between the time of inspection and when a refrigerant leak actually occurs, and if a refrigerant leak actually occurs, the outdoor unit 1 enters a normal operation impossible state, and automatically enters a normal operation possible state after a predetermined period (e.g., three minutes) has elapsed since entering the normal operation impossible state. This is because it takes time for the shutoff valve 3 to change from an open state to a closed state after a refrigerant leak is detected, so operation of the outdoor unit 1 is stopped for a predetermined period after the refrigerant leak is detected. Also, even if a refrigerant leak is detected in some of the indoor units 2, the outdoor units 1 are set to a normal operation state after the predetermined period has elapsed so that the indoor units 2 that are not leaking can continue to operate.

[0106] In addition, when normal operation is not possible, the outdoor unit 1 may display a message in a manner that enables an inspector to know that inspection is being performed.

[0107] Returning to the explanation of the operation of the indoor unit 2, the indoor unit control unit 20 transmits a close state instruction signal to the shutoff valve 3 (step SA12). The close state instruction signal is a signal indicating an instruction to transition the open / closed state of the shutoff valve 3 to the closed state.

[0108] When the shutoff valve control unit 30 receives the close state instruction signal from the indoor unit 2, it switches the open / close state of the shutoff valve 3 to the closed state by closing the on-off valve of the shutoff unit 32 (step SA13). In addition, the shutoff valve control unit 30 notifies the notification unit 33 that the shutoff valve 3 is in the closed state (step SA13).

[0109] Next, the shutoff valve control section 30 transmits a closed state signal indicating that the shutoff valve 3 is in the closed state to the indoor unit 2 (step SA14).

[0110] When the indoor unit control section 20 receives the closed state signal from the shutoff valve 3, it transmits the closed state signal to the centralized control device 7 (step SA15).

[0111] When the management control unit 70 receives a closed state signal from the indoor unit 2, it displays the second code "TP08" in the third display area A3 for the inspection-related object OB of the remote control wiring group GP that includes the indoor unit 2 that received the closed state signal (step SA16).

[0112] Next, the management control unit 70 displays the word "closed" in the fifth display area A5 for the inspection-related object OB of the remote control wiring group GP that includes the indoor unit 2 that sent the close signal (step SA17). Note that step SA17 also updates the management data 722. That is, the management control unit 70 updates the open / close state of the shutoff valve 3 recorded in the record R of the remote control wiring group GP that includes the indoor unit 2 that sent the close signal from the open state to the closed state.

[0113] Steps SA16 and SA17 may be performed simultaneously, or the order of the steps may be reversed.

[0114] FIG. 11 is a diagram showing an example of the inspection screen IG. FIG. 11 illustrates an example in which the display contents of inspection-related objects OB1 and OB2, among the four inspection-related objects OB, are changed.

[0115] When the indoor unit 2 of the remote control wiring group GP corresponding to the inspection-related object OB1 sends a closed state signal to the centralized control device 7, as shown in Figure 11, the third display area A3 of the inspection-related object OB1 stops displaying the string "In Progress" and displays the second code "TP08". Furthermore, when the indoor unit 2 of the remote control wiring group GP corresponding to the inspection-related object OB1 sends a closed state signal to the centralized control device 7, as shown in Figure 11, the fifth display area A5 of the inspection-related object OB1 stops displaying the word "open" and displays the word "closed."

[0116] When the indoor unit 2 of the remote control wiring group GP corresponding to the inspection-related object OB2 sends a closed state signal to the centralized control device 7, as shown in Figure 11, the third display area A3 of the inspection-related object OB2 stops displaying the string "In Progress" and displays the second code "TP08". Furthermore, when the indoor unit 2 of the remote control wiring group GP corresponding to the inspection-related object OB2 sends a closed state signal to the centralized control device 7, as shown in Figure 11, the fifth display area A5 of the inspection-related object OB2 stops displaying the word "open" and displays the word "closed."

[0117] Returning to the explanation of the operation of the indoor unit 2, the indoor unit control unit 20 transmits a closed state signal to the indoor unit remote control 4A via the second indoor unit communication unit 22 (step SA18).

[0118] When the remote control unit 40 receives the closed state signal from the indoor unit 2, it displays that the shutoff valve 3 is in the closed state (step SA19).

[0119] [1-2-2. Ending inspection by operating the centralized control device] Next, the operation of each part of the air conditioning system 1000 when the inspector ends the inspection by operating the centralized control device 7 after having finished checking the operation of the safety device 6 will be described.

[0120] FIG. 12 is a sequence diagram showing the operation of each part of the air conditioning system 1000. Figure 12 shows the operations of the outdoor unit 1, indoor unit 2, shutoff valve 3, detection alarm 5, and indoor unit remote control 4. The operation of the outdoor unit 1 shown in Figure 12 is the operation of the outdoor unit 1 that belongs to the same refrigerant system RS as the indoor unit 2 included in the remote control wiring group GP that has been subject to inspection completion. Furthermore, the operations of the indoor unit 2, shutoff valve 3, detection alarm 5, and indoor unit remote control 4 shown in Figure 12 are the operations of the indoor unit 2, shutoff valve 3, detection alarm 5, and indoor unit remote control 4 that are included in the remote control wiring group GP that has been subject to inspection completion.

[0121] When the inspection end button B4 is operated on the inspection screen IG, the management control unit 70 receives an inspection end instruction for the remote control wiring group GP whose check box CB is checked on the inspection screen IG (step SB1).

[0122] Next, the management control unit 70 transmits an inspection end signal indicating the end of the inspection to the indoor units 2 (step SB2). The indoor units 2 that are the transmission destinations in step SB2 are all the indoor units 2 included in the remote control wiring group GP selected on the inspection screen IG.

[0123] In step SB2, the management control unit 70 reads the record R of the remote control wiring group GP selected on the inspection screen IG from the management data 722, reads the first address information from the read record R, and transmits an inspection end signal based on the read first address information.

[0124] When the indoor unit control unit 20 receives the inspection end signal from the centralized control device 7, it ends the air blowing operation (step SB3), and sends the inspection end signal to the shutoff valve 3 via the second indoor unit communication unit 22 (step SB4).

[0125] When the shutoff valve control unit 30 receives the inspection end signal from the indoor unit 2, it switches the on-off valve of the shutoff unit 32 to the open state, sets the on-off state of the shutoff valve 3 to the open state, and terminates the notification by the notification unit 33 (step SB5).

[0126] Next, the shutoff valve control section 30 transmits an open state signal indicating that the shutoff valve 3 is in the open state to the indoor unit 2 (step SB6).

[0127] When the indoor unit control section 20 receives the open state signal from the shutoff valve 3, it transmits the open state signal to the centralized control device 7 via the first indoor unit communication section 21 (step SB7).

[0128] When the management control unit 70 receives an open state signal from the indoor unit 2, it displays the character "open" in the fifth display area A5 for the inspection-related object OB of the remote control wiring group GP that includes the indoor unit 2 that received the open state signal (step SB8). Note that step SB8 also updates the management data 722. That is, the management control unit 70 updates the open / closed state of the shutoff valve 3 recorded in the record R of the remote control wiring group GP that includes the indoor unit 2 that sent the open state signal from the closed state to the open state.

[0129] Furthermore, when the management control unit 70 receives an open state signal from the indoor unit 2, it blanks out the third display area A3 for the inspection-related object OB of the remote control wiring group GP that includes the indoor unit 2 that received the open state signal (step SB9). The third display area A3 may also be blanked out when an alarm stop signal for the detection alarm 5 is received in addition to the open state signal.

[0130] Furthermore, when the management control unit 70 receives an open state signal from the indoor unit 2, it displays the string "Inspection completed" on the inspection-related object OB of the remote control wiring group GP that includes the indoor unit 2 that received the open state signal (step SB10).

[0131] The order of steps SB8, SB9, and SB10 is not limited to this, and steps SB8, SB9, and SB10 may be performed simultaneously.

[0132] FIG. 13 is a diagram showing an example of the inspection screen IG. FIG. 13 illustrates an example in which the inspection end button B4 is operated when the check box CB of the inspection-related object OB1 among the four inspection-related objects OB is checked.

[0133] When the check box CB of the inspection-related object OB1 is checked, the inspection end button B4 is operated, and then an open state signal is received from the indoor unit 2, the third display area A3 of the inspection-related object OB1 becomes blank, as shown in Figure 13. Furthermore, when the inspection end button B4 is operated while the check box CB of the inspection-related object OB1 is checked, and an open state signal is then received from the indoor unit 2, the fifth display area A5 of the inspection-related object OB1 displays the word "open," as shown in Figure 13. Furthermore, when the inspection end button B4 is operated while the check box CB of the inspection-related object OB1 is checked, and an open state signal is subsequently received from the indoor unit 2, the inspection-related object OB1 displays the string "Inspection completed," as shown in FIG. 13.

[0134] Returning to the explanation of the operation of the indoor unit 2, the indoor unit control unit 20 transmits an inspection end signal to the detection alarm 5A and the indoor unit remote control 4A (step SB11). The indoor unit control unit 20 also transmits an inspection end signal to the outdoor unit 1 (step SB11).

[0135] When the remote control unit 40 receives the inspection end signal from the indoor unit 2, it displays that the inspection has ended (step SB12).

[0136] When the alarm control unit 50 receives the inspection end signal from the indoor unit 2, it stops issuing an alarm (step SB13).

[0137] When the outdoor unit control section 10 receives the inspection end signal from the indoor unit 2, it changes the state of the outdoor unit 1 from a normal operation disabled state to a normal operation enabled state (step SB14).

[0138] The inspection date and time displayed by the inspection-related object OB may be changed to the date and time when the inspection end button B4 is operated, instead of the date and time when the inspection start button B3 is operated. A configuration in which the inspection date and time is changed to the date and time when the inspection start button B3 is operated has the following effect. That is, even when multiple remote control wiring groups GP are inspected at once, the inspection dates and times are the same, improving the ease of inspection-related management. A configuration in which the inspection date and time is changed to the date and time when the inspection end button B4 is operated has the following effect. That is, because the inspection date and time are not updated for remote control wiring groups GP for which inspection has not been completed, the inspector can easily identify remote control wiring groups GP that have not been inspected by checking the inspection date and time.

[0139] [1-1-3. When the inspection is forcibly terminated] In this embodiment, if the inspection end button B4 is not operated for a predetermined period (e.g., 12 hours) or more after the inspection has started, in other words, if the inspection has not been completed for a predetermined period or more, the inspection will be forcibly terminated. Next, the operation of each part of the air conditioning system 1000 when an inspection started by operating the centralized control device 7 is forcibly terminated will be described. Fig. 14 is a sequence diagram showing the operation of each part of the air conditioning system 1000. In the explanation of Fig. 14, the same steps as those in Fig. 12 are given the same reference numerals, and detailed explanations thereof will be omitted as appropriate.

[0140] 14 shows the operations of the outdoor unit 1, indoor unit 2, shutoff valve 3, detection alarm 5, and indoor unit remote control 4. The operation of the outdoor unit 1 shown in Fig. 14 is the operation of the outdoor unit 1 that belongs to the same refrigerant system RS as the indoor unit 2 included in the remote control wiring group GP that was subject to forced termination. Furthermore, the operations of the indoor unit 2, shutoff valve 3, detection alarm 5, and indoor unit remote control 4 shown in Fig. 14 are the operations of the indoor unit 2, shutoff valve 3, detection alarm 5, and indoor unit remote control 4 that are included in the remote control wiring group GP that was subject to forced termination.

[0141] Next, the management control unit 70 transmits an inspection end signal to the indoor units 2 (step SC1). The indoor units 2 that are the transmission destinations in step SC1 are all the indoor units 2 included in the remote control wiring group GP for which inspection is forcibly terminated.

[0142] In step SC1, the management control unit 70 compares the inspection date and time displayed by the inspection-related object OB displaying the second code "TP08" with the current date and time, and if the inspection date and time are separated from the current date and time by a predetermined period of time or more, reads out the record R corresponding to this inspection-related object OB from the management data 722. Then, the management control unit 70 reads out the first address information from the read out record R, and transmits an inspection end signal based on the read out first address information.

[0143] When the management control unit 70 receives an open state signal from the indoor unit 2, it displays the word "open" in the fifth display area A5 for the inspection-related object OB of the remote control wiring group GP that includes the indoor unit 2 that received the open state signal (step SB8).

[0144] Furthermore, when the management control unit 70 receives an open state signal from the indoor unit 2, it blanks out the third display area A3 for the inspection-related object OB of the remote control wiring group GP that includes the indoor unit 2 that received the open state signal (step SB9).

[0145] Furthermore, when the management control unit 70 receives an open state signal from the indoor unit 2, it displays the string "Inspection not completed" on the inspection-related object OB of the remote control wiring group GP that includes the indoor unit 2 that received the open state signal (step SC2).

[0146] The order of steps SB8, SB9, and SC2 is not limited to this, and steps SB8, SB9, and SC2 may be performed simultaneously.

[0147] 12 and 14, when an inspection is forcibly terminated, the inspection date and time displayed by the inspection-related object OB is not updated. Also, when an inspection is forcibly terminated, the inspection date and time recorded in the record R is not updated.

[0148] FIG. 15 is a diagram showing an example of the inspection screen IG. Figure 15 illustrates an example in which an inspection being performed in the remote control wiring group GP corresponding to the inspection-related object OB1 is forcibly terminated. The inspection date and time of the previous inspection of the inspection-related object OB1 at the top of Figure 15 is 14:54:30 on March 3, 2024.

[0149] When the inspection is forcibly terminated, as shown in FIG. 15, the second code "TP08" is hidden in the third display area A3 of the inspection-related object OB1, and the area becomes blank. Furthermore, when the inspection is forcibly terminated, the fifth display area A5 of the inspection-related object OB1 displays the word "open" as shown in FIG. Furthermore, when the inspection is forcibly terminated, the inspection-related object OB1 displays the character string "Inspection incomplete" as shown in FIG. Also, if the inspection is forcibly terminated, the inspection date and time will not be updated.

[0150] [1-1-4. Starting and ending inspection by operating the indoor unit remote control] In this embodiment, the remote control control unit 40 receives an inspection start instruction and an inspection end instruction via the remote control operation unit 43. More specifically, the indoor unit remote control 4 receives an inspection start instruction and an inspection end instruction for the remote control wiring group GP to which the indoor unit remote control 4 itself belongs. The indoor unit remote control 4 also receives an inspection start instruction and an inspection end instruction for all remote control wiring groups GP to which the indoor units 2 that air-condition the air-conditioned space S in which the indoor unit remote control 4 itself is located belong.

[0151] First, the operation of each part of the air conditioning system 1000 when the indoor unit remote control 4 receives an inspection start instruction for the remote control wiring group GP in which the indoor unit remote control 4 itself is included will be described.

[0152] FIG. 16 is a sequence diagram showing the operation of each part of the air conditioning system 1000. Figure 16 shows the operations of the indoor unit 2, shutoff valve 3, and detection alarm 5. The operations of the indoor unit 2, shutoff valve 3, and detection alarm 5 shown in Figure 16 are the operations of the indoor unit 2, shutoff valve 3, and detection alarm 5 that are included in the same remote control wiring group GP as the indoor unit remote control 4 that has received the inspection start command.

[0153] In the description of FIG. 16, the same steps as those in FIG. 9 are denoted by the same reference numerals, and detailed description thereof will be omitted where appropriate.

[0154] The remote control control unit 40 receives an inspection start instruction for the remote control wiring group GP to which it belongs (step SD1).

[0155] Next, the remote control control unit 40 transmits an inspection start signal and a first inspection target signal to the indoor unit 2 (step SD2). The first inspection target signal is a signal indicating that the inspection target is the remote control wiring group GP in which it is included.

[0156] When the indoor unit control unit 20 receives the inspection start signal and the first inspection target signal from the indoor unit remote control 4, it transmits the inspection start signal to the detection alarm 5 via the second indoor unit communication unit 22 (step SD3).

[0157] Next, the operation of each part of the air conditioning system 1000 when the indoor unit remote control 4 receives an inspection end instruction for the remote control wiring group GP in which the indoor unit remote control 4 is included will be described.

[0158] FIG. 17 is a sequence diagram showing the operation of each part of the air conditioning system 1000. Figure 17 shows the operations of the indoor unit 2, shutoff valve 3, and detection alarm 5. The operations of the indoor unit 2, shutoff valve 3, and detection alarm 5 shown in Figure 17 are the operations of the indoor unit 2, shutoff valve 3, and detection alarm 5 that are included in the same remote control wiring group GP as the indoor unit remote control 4 that has received the inspection end instruction.

[0159] In the description of FIG. 17, the same steps as those in FIG. 12 are denoted by the same reference numerals, and detailed description thereof will be omitted where appropriate.

[0160] The remote control control unit 40 receives an inspection end instruction for the remote control wiring group GP to which the remote control control unit 40 belongs (step SE1).

[0161] Next, the remote control control unit 40 transmits an inspection end signal and a first inspection target signal to the indoor unit 2 (step SE2).

[0162] When the indoor unit control unit 20 receives the closed state signal from the shutoff valve 3, it transmits an inspection end signal to the detection alarm 5 and the indoor unit remote control 4 (step SE3).

[0163] Next, the operation of each part of the air conditioning system 1000 when the indoor unit remote controller 4 receives an inspection start instruction for all remote controller wiring groups GP included in the refrigerant system RS will be described.

[0164] FIG. 18 is a sequence diagram showing the operation of each part of the air conditioning system 1000. In Fig. 18, the operations of the parts surrounded by a frame WK1 are operations performed in each remote control wiring group GP. On the other hand, in Fig. 18, the operations of the indoor unit remote controls 4 not surrounded by a frame WK1 are operations of the indoor unit remote controls 4 that accept the inspection start instruction. Also, in Fig. 18, the operations of the indoor units 2 not surrounded by a frame WK1 are operations of the indoor units 2 included in the remote control wiring group GP of the indoor unit remote control 4 that accepts the inspection start instruction.

[0165] In the description of FIG. 18, the same steps as those in FIG. 16 are denoted by the same reference numerals, and detailed description thereof will be omitted where appropriate.

[0166] The remote control control unit 40 receives an inspection start instruction for all remote control wiring groups included in the refrigerant system RS (step SF1).

[0167] Next, the remote control control unit 40 transmits an inspection start signal and a second inspection target signal to the indoor unit 2 (step SF2). The second inspection target signal is a signal indicating that the inspection targets are all remote control wiring groups GP included in the refrigerant system RS.

[0168] When the indoor unit control unit 20 receives the inspection start instruction signal and the second inspection target signal from the indoor unit remote control 4, it transmits the inspection start signal to the outdoor unit 1 via the first indoor unit communication unit 21 (step SF3).

[0169] When the outdoor unit control section 10 receives the inspection start signal, it transmits the inspection start signal to all indoor units 2 included in the refrigerant system RS to which it belongs (step SF4).

[0170] Thereafter, the processes from step SD3 onwards are carried out in each of the remote control wiring groups GP included in the refrigerant system RS.

[0171] Next, the operation of each part of the air conditioning system 1000 when the indoor unit remote control 4 receives an inspection end instruction for all remote control wiring groups GP included in the refrigerant system RS will be described.

[0172] Fig. 19 is a sequence diagram showing the operation of each part of the air conditioning system 1000. In Fig. 19, the operation of each part surrounded by a frame WK2 is the operation performed by each remote control wiring group GP. On the other hand, in Fig. 19, the operation of an indoor unit remote control 4 not surrounded by a frame WK2 is the operation of an indoor unit remote control 4 that accepts an inspection end instruction. Also, in Fig. 19, the operation of an indoor unit 2 not surrounded by a frame WK2 is the operation of an indoor unit 2 included in the remote control wiring group GP of the indoor unit remote control 4 that accepts an inspection end instruction.

[0173] In the description of FIG. 19, the same steps as those in FIG. 17 are denoted by the same reference numerals, and detailed description thereof will be omitted where appropriate.

[0174] The remote control control unit 40 receives an inspection end instruction for all remote control wiring groups GP included in the refrigerant system RS (step SG1).

[0175] Next, the remote control control unit 40 transmits an inspection end signal and a second inspection target signal to the indoor unit 2 (step SG2).

[0176] When the indoor unit control unit 20 receives the inspection end signal and the second inspection target signal from the indoor unit remote control 4, it transmits the inspection end signal to the outdoor unit 1 via the first indoor unit communication unit 21 (step SG3).

[0177] When the outdoor unit control section 10 receives the inspection start signal, it transmits the inspection start signal to all indoor units 2 included in the refrigerant system RS to which it belongs (step SG4).

[0178] Thereafter, the processes from step SB3 onwards are carried out in each of the remote control wiring groups GP included in the refrigerant system RS.

[0179] [1-1-5. If the shutoff valve is closed when inspection begins] Next, the operation of each part of the air conditioning system 1000 when the shutoff valve 3 is in a closed state at the start of inspection will be described.

[0180] If the shutoff valves 3 of the remote control wiring group GP to be inspected are in the closed state when step SA1 is received, the management control unit 70 sends a stop request signal to the indoor units 2 of the remote control wiring group GP to be inspected before executing the processes from step SA2 onwards. The stop request signal is information requesting the halt of the safety ensuring operation.

[0181] When the indoor unit control unit 20 receives the stop request signal, it transmits an open state instruction signal to the shutoff valve 3. The open state instruction signal is a signal that indicates an instruction to transition the open / closed state of the shutoff valve 3 to the open state.

[0182] When the shutoff valve control unit 30 receives the open state instruction signal, it puts the shutoff valve 3 into an open state, and then transmits an open state signal to the indoor unit 2.

[0183] When the indoor unit control unit 20 receives the open state signal from the shutoff valve 3, it transmits the open state signal to the centralized control device .

[0184] When the management control unit 70 receives the open state signal from the shutoff valve 3, it displays that the shutoff valve 3 is open in the inspection-related object OB of the remote control wiring group GP that includes the indoor unit 2 that sent the open state signal. Then, the management control unit 70 executes the processes from step SA2 onwards.

[0185] As a result, the inspection screen IG displays that the shutoff valve 3 will transition to the open state and then to the closed state, so the inspector can easily understand that the shutoff valve 3 has transitioned to the closed state as the inspection begins.

[0186] The operation and display when the shutoff valve 3 is in a closed state at the start of inspection may be performed by the indoor unit remote controller 4.

[0187] [1-1-6. Operation related to stopping the alarm] In this embodiment, the alarm control unit 50 receives an instruction to stop issuing an alarm via the alarm operation unit 53. When the alarm control unit 50 receives the instruction to stop issuing an alarm, it causes the alarm unit 52 to stop issuing an alarm.

[0188] Furthermore, in this embodiment, the remote control control unit 40 receives an alarm stop instruction via the remote control operation unit 43. When the remote control control unit 40 receives an alarm stop instruction, it transmits an alarm stop request signal to the indoor unit 2. The alarm stop request signal is a signal requesting that the issuance of an alarm be stopped. When the indoor unit control unit 20 receives an alarm stop request signal from the indoor unit remote control 4, it transmits the alarm stop request signal to the detection alarm 5. When the alarm control unit 50 receives an alarm stop request signal from the indoor unit 2, it stops the issuance of an alarm by the alarm activation unit 52. In other words, the detection alarm 5 can stop alarm activation upon receiving an inspection end signal, and upon receiving an alarm stop request signal. Because the issuance of an alarm by the detection alarm 5 can be unpleasant for occupants, the detection alarm can be stopped by an alarm stop operation of the detection alarm 5 itself, or by an alarm stop request signal via an alarm stop operation of the indoor unit remote control 4 of the remote control wiring group GP to which it belongs. On the other hand, it is preferable to make it impossible to stop the activation of the target detection alarm 5 by operating a terminal installed in a room other than the room in which the target detection alarm 5 is installed. This is because if the activation of the target alarm is stopped by an operation in another room while an inspection is being carried out, there is a possibility that the inspector may fail to check that the detection alarm has been activated. Here, "a terminal installed in a room other than the room in which the target detection alarm 5 is installed" refers to, for example, a detection alarm 5 other than the target detection alarm 5, an indoor unit remote control 4 that belongs to a group other than the remote control wiring group GP to which the target detection alarm 5 belongs, and the centralized management device 7. Furthermore, it is preferable that safety operations other than the activation of the detection alarm 5 cannot be individually deactivated during inspection. Examples of safety operations other than the activation of the detection alarm 5 include closing the shutoff valve 3, operating the ventilation device, and operating the fan of the indoor unit 2. These safety operations do not cause discomfort to occupants compared to the activation of the detection alarm 5. Therefore, to improve the ease of inspection work, these safety operations cannot be individually stopped during inspection. Furthermore, in the event of a refrigerant leak, increasing safety within the room may be given priority, and the alarm may not be stopped by the alarm stop request signal, but the detection alarm 5 may continue to sound until safety within the room is ensured. Examples of a state in which safety within the room is ensured include when the refrigerant concentration detected by the refrigerant sensor 54 falls below a predetermined value, or when, after the refrigerant concentration falls below the predetermined value, a service technician operates the indoor unit remote control 4 to stop operation of the safety device 6.

[0189] [1-3. Effects, etc.] As described above, the air conditioning system 1000 includes a plurality of indoor units 2, a plurality of safety devices 6 for ensuring safety from refrigerant leakage, and a terminal device 8. The terminal device 8 receives an inspection start instruction and an inspection end instruction for each remote control wiring group GP. When the terminal device 8 receives an inspection start instruction for the remote control wiring group GP to which the safety device 6 belongs, the safety device 6 starts a safety ensuring operation. When the terminal device 8 receives an inspection end instruction for the remote control wiring group GP to which the safety device 6 belongs, the safety device 6 ends the safety ensuring operation.

[0190] This allows inspection of whether the safety device 6 will operate normally in the event of a refrigerant leak to be performed on the desired safety device 6. Therefore, an inspector can efficiently inspect whether the safety device 6 will operate normally in the event of a refrigerant leak.

[0191] The air conditioning system 1000 includes multiple indoor unit remote controls 4. The multiple indoor units 2 condition multiple conditioned spaces S. An indoor unit remote control 4 is arranged in one conditioned space S. The remote control wiring group GP further includes an indoor unit remote control 4. The indoor unit remote control 4 receives inspection start instructions and inspection end instructions for the remote control wiring group GP in which it is included, or for all remote control wiring groups GP included in the refrigerant system RS to which the indoor units 2 that condition the conditioned space S in which it is placed belong.

[0192] This allows inspection to be performed on the safety devices 6 included in one remote control wiring group GP, or on all the safety devices 6 included in the refrigerant system RS. Therefore, when inspection is performed on the safety devices 6 of one remote control wiring group GP, the safety devices 6 of other remote control wiring groups GP will not perform safety ensuring operations. Furthermore, when inspection is performed on all the safety devices 6 included in the refrigerant system RS, the inspector can issue inspection start and inspection end instructions in one air-conditioned space S without having to go to all the air-conditioned spaces S. Therefore, the inspector can more efficiently inspect whether the safety devices 6 will operate normally in the event of a refrigerant leak.

[0193] The centralized control device 7 receives inspection start instructions and inspection end instructions for one or more remote control wiring groups GP, for all remote control wiring groups GP included in one refrigerant system RS, or for all remote control wiring groups GP included in multiple refrigerant systems RS.

[0194] This allows the inspector to inspect the safety device 6 in accordance with the inspector's inspection style, which allows the inspector to more efficiently inspect whether the safety device 6 operates normally in the event of a refrigerant leak.

[0195] The remote control wiring group GP includes multiple safety devices 6, namely, detection alarms 5 and shutoff valves 3. The detection alarms 5 can receive an alarm termination instruction to end the alarm while an alarm is being issued, and will end the alarm when the alarm termination instruction is received. After starting the safety ensuring operation, the shutoff valves 3 will not end the safety ensuring operation until the terminal device 8 receives an inspection end instruction.

[0196] This allows the inspector to stop the issuance of the alarm if the inspector feels uncomfortable about the issuance of the alarm, thereby preventing the inspector from feeling uncomfortable about the alarm.

[0197] The central control device 7 accepts an instruction to end inspection of each remote control wiring group GP, but does not accept an operation end instruction to individually end the safety ensuring operation of the safety device 6 during inspection.

[0198] This makes it possible to prevent the safety device 6 from terminating the safety ensuring operation due to an erroneous operation of the centralized control device 7 while checking whether the safety device 6 is operating normally. Therefore, it is possible to prevent the inspection result from being incorrect.

[0199] At least one of the indoor unit remote control 4 and the detection alarm 5 can accept an alarm termination instruction from a detection alarm 5 included in the remote control wiring group GP to which it belongs. A detection alarm 5 will terminate alarm activation when an indoor unit remote control 4 or detection alarm 5 included in the remote control wiring group GP to which it belongs accepts an alarm activation termination instruction. Operation of at least one of the other indoor unit remote controls 4 and other detection alarms 5 will not terminate alarm activation of other detection alarms 5.

[0200] This makes it possible to prevent the detection alarm 5 being inspected from terminating its safety ensuring operation due to an indoor unit remote control 4 or detection alarm 5 in another air-conditioned space S while inspecting whether the detection alarm 5 is operating normally. This makes it possible to prevent the inspection result from being incorrect.

[0201] When the indoor unit remote control 4 receives an inspection start instruction for multiple remote control wiring groups GP, the indoor unit remote control 4 transmits an inspection start signal to the indoor units 2. Then, the indoor units 2 transmit the inspection start signal to the multiple safety devices 6 to be inspected via the outdoor units 1 that belong to the refrigerant system RS to which the indoor units 2 belong.

[0202] According to this, an inspection start signal is sent to the multiple remote control wiring groups GP to be inspected via the outdoor unit 1. Therefore, there is no need to create a new mechanism for communication between the indoor units 2 in the remote control wiring groups GP, and it is possible to prevent the introduction of this new mechanism from increasing the processing load on the indoor units 2.

[0203] While the safety device 6 is performing a safety ensuring operation, the terminal device 8 does not accept an instruction to make the safety device 6 perform normal operation.

[0204] This can prevent the safety device 6 from accidentally canceling the safety ensuring operation during inspection, thereby preventing the inspection result from being incorrect.

[0205] In the control method of the air conditioning system 1000, the terminal device 8 receives an inspection start instruction and an inspection end instruction for each remote control wiring group GP. Also, in the control method of the air conditioning system 1000, the safety device 6 starts a safety ensuring operation when the terminal device 8 receives an inspection start instruction for the remote control wiring group GP to which the safety device 6 belongs, and ends the safety ensuring operation when the terminal device 8 receives an inspection end instruction for the remote control wiring group GP to which the safety device 6 belongs.

[0206] This provides the same effects as those of the air conditioning system 1000 described above.

[0207] The air conditioning system 1000 includes a shutoff valve 3 and a terminal device 8 that displays the open / closed state of the shutoff valve 3 during an inspection to determine whether the shutoff valve 3 operates normally in the event of a refrigerant leak.

[0208] According to this, during an inspection to determine whether the shutoff valve 3 will operate normally in the event of a refrigerant leak, the terminal device 8 displays the open / closed state of the shutoff valve 3. Therefore, when inspecting whether the shutoff valve 3 will operate normally in the event of a refrigerant leak, the inspector can easily confirm whether the shutoff valve 3 is operating normally. In particular, the shutoff valve 3 is installed in a location where it is difficult to check its open / closed state, such as above the ceiling. However, because the open / closed state of the shutoff valve 3 can be confirmed on the terminal device 8, the inspector can easily confirm whether the shutoff valve 3 is operating normally.

[0209] The air conditioning system 1000 includes a plurality of indoor unit remote controls 4, a plurality of indoor units 2 that condition a plurality of conditioned spaces, and a plurality of shutoff valves 3. In the air conditioning system 1000, a remote control wiring group GP is formed that includes the indoor unit remote controls 4, the indoor units 2, and the shutoff valves 3. When a shutoff valve 3 included in the remote control wiring group GP to which the indoor unit remote control 4 belongs is subject to inspection, the indoor unit remote control 4 displays the open / closed state of the shutoff valve 3 included in the remote control wiring group GP to which the indoor unit remote control 4 belongs.

[0210] According to this, the indoor unit remote control 4 will not display the open / closed state of the shutoff valves 3 other than those in the remote control wiring group GP to which it belongs. Therefore, when an inspector checks the open / closed state of the shutoff valves 3 using the indoor unit remote control 4, it is possible to prevent the inspector from checking the open / closed state of the wrong shutoff valve 3. This makes it possible to prevent the inspector from making an incorrect inspection.

[0211] The central control device 7 displays the open / closed state of the shutoff valve 3 for each remote control wiring group GP.

[0212] This allows the inspector to easily check the state of the shutoff valve 3 of which remote control wiring group GP.

[0213] If the shutoff valve 3 is performing a safety operation to ensure safety against refrigerant leakage when inspection begins, the safety operation will be completed and then performed again. The centralized control device 7 displays the open / closed state of the shutoff valve 3 in accordance with the start and end of the safety operation of the shutoff valve 3.

[0214] As a result, even if the shutoff valve 3 is closed at the start of inspection, it is displayed that the shutoff valve 3 will transition to an open state and then to a closed state during inspection. Therefore, the inspector can easily understand that the shutoff valve 3 has transitioned to a closed state as inspection begins.

[0215] The control program 721 causes the processor 700 of the centralized control device 7 to display the open / closed state of the shutoff valve 3 while checking whether the shutoff valve 3 operates normally in the event of a refrigerant leak. The control program 421 causes the processor 400 of the indoor unit remote controller 4 to display the open / closed state of the shutoff valve 3 while checking whether the shutoff valve 3 operates normally.

[0216] This provides the same effects as those of the air conditioning system 1000 described above.

[0217] The display method by the centralized control device 7 displays the open / closed state of the shutoff valve 3 while checking whether the shutoff valve 3 will operate normally in the event of a refrigerant leak. Also, the display method by the indoor unit remote control 4 displays the open / closed state of the shutoff valve 3 while checking whether the shutoff valve 3 will operate normally in the event of a refrigerant leak.

[0218] This provides the same effects as those of the air conditioning system 1000 described above.

[0219] The air conditioning system 1000 includes a safety device 6 for ensuring safety from refrigerant leakage, and a centralized control device 7. The centralized control device 7 displays a first code when a refrigerant leakage occurs. Furthermore, when an inspection is being performed to determine whether the safety device 6 operates normally in the event of a refrigerant leakage, the centralized control device 7 displays a second code different from the first code.

[0220] According to this, if a refrigerant leak occurs, the first code is displayed, and if a refrigerant leak occurs and an inspection is being conducted to determine whether the safety device 6 is operating normally, the second code is displayed. Therefore, it is easy to distinguish whether a refrigerant leak has occurred or whether an inspection is being conducted to determine whether the safety device 6 is operating normally.

[0221] The centralized control device 7 further displays the inspection date and time, which is the date and time when the inspection was performed.

[0222] This allows the inspector to be supported in carrying out the next inspection at the appropriate time by displaying the inspection date and time.

[0223] If an inspection does not end within a predetermined period of time after it started, the inspection is forcibly terminated. If the inspection ends within the predetermined period of time after it started, the centralized control device 7 updates the displayed inspection date and time to the date and time the inspection ended, but if the inspection is forcibly terminated, the centralized control device 7 does not update the displayed inspection date and time.

[0224] This prevents the displayed inspection date and time from being updated to the date and time the inspection ended, even if the inspection was forcibly terminated, thereby further supporting the inspector so that the next inspection can be performed at an appropriate time.

[0225] The control program 721 causes the processor 700 of the centralized management device 7 to display a first code when a refrigerant leak has occurred, and to display a second code different from the first code when an inspection is being performed to determine whether the safety device 6, which is designed to ensure safety from refrigerant leaks when a refrigerant leak has occurred, is operating normally.

[0226] This provides the same effects as those of the air conditioning system 1000 described above.

[0227] The display method by the centralized control device 7 is to display a first code when a refrigerant leak has occurred, and to display a second code different from the first code when an inspection is being carried out to determine whether the safety device 6, which is for ensuring safety from refrigerant leaks in the event of a refrigerant leak, is operating normally.

[0228] This provides the same effects as those of the air conditioning system 1000 described above.

[0229] (Embodiment 2) Next, a second embodiment will be described. Regarding the configuration of each part of the air conditioning system 1000 in the second embodiment, detailed description of the configuration similar to the configuration of each part of the air conditioning system 1000 in the first embodiment will be omitted as appropriate.

[0230] [2-1.Configuration] In comparison with the first embodiment, the second embodiment includes a plurality of shutoff valves 3 in at least one of the remote control wiring groups GP formed in the air conditioning system 1000. The remote control wiring group GP in the present embodiment is a group that includes the indoor units 2 and devices that are directly or indirectly connected to the indoor units 2 by remote control wiring RL.

[0231] FIG. 20 is a diagram showing the configuration of an air conditioning system 1000 according to the second embodiment. 1 and 20, in this embodiment, the remote control wiring group GP1 has two shutoff valves 3, namely, shutoff valves 3A and 3E. When multiple shutoff valves 3 are included in one remote control wiring group GP, as in the case of the remote control wiring group GP1, this is the case when the capacity of the indoor unit 2 is large. The shutoff valves 3A and 3E are connected by a remote control wiring RL.

[0232] FIG. 21 is an example of the inspection screen IG according to the second embodiment. As is clear from a comparison of Fig. 8 and Fig. 21, in this embodiment, the open / closed state of each shutoff valve 3 is displayed in the inspection-related object OB of a remote control wiring group GP that includes multiple shutoff valves 3. When a remote control wiring group GP has multiple shutoff valves 3, the identification information assigned to each shutoff valve 3 may also be displayed. This makes it possible to identify the shutoff valve 3 that should be checked in detail if there is a shutoff valve 3 that has not been inspected properly, thereby improving the efficiency of the inspection work. 21, the inspection-related object OB1 is the inspection-related object OB of the remote control wiring group GP1. Therefore, the inspection-related object OB1 in Fig. 21 displays the open / closed states of the shutoff valves 3A and 3E.

[0233] In this embodiment, the record R of a remote control wiring group GP including a plurality of shutoff valves 3 records the open / closed state of each shutoff valve 3. Therefore, the record R of the remote control wiring group GP1 records the open / closed states of the shutoff valves 3A and 3E.

[0234] [2-2. Operation] Next, the operation of each part of the air conditioning system 1000 in the second embodiment will be described. In the explanation of this operation, the remote control wiring group GP1 will be taken as an example to explain the differences from the first embodiment.

[0235] When the indoor unit 2A receives a pseudo leak signal from the detection alarm 5A, it sends a close state instruction signal to the shutoff valve 3A. When the shutoff valve 3A receives a close state instruction signal from the indoor unit 2A, it sends a close state instruction signal to the shutoff valve 3E. When the shutoff valve 3E changes its own open / close state to the closed state and issues an alert using the alert unit 33, it sends a close state signal to the shutoff valve 3A. When the shutoff valve 3A changes its own open / close state to the closed state and issues an alert using the alert unit 33, it sends two close state signals to the indoor unit 2A. When the indoor unit 2A receives two close state signals from the shutoff valve 3A, it sends two close state signals to the centralized control device 7.

[0236] When the centralized control device 7 receives the two closed state signals from the indoor unit 2A, it displays that the shutoff valves 3A and 3E are closed in the inspection-related object OB1 displayed on the inspection screen IG. Furthermore, when the centralized control device 7 receives the two closed state signals from the indoor unit 2A, it changes the open / closed state of the shutoff valves 3A and 3E recorded in the record R of the remote control wiring group GP1 to the closed state.

[0237] When the indoor unit 2A receives an inspection end signal from the centralized control device 7, it transmits the inspection end signal to the shutoff valve 3A. When the shutoff valve 3A receives an inspection end signal from the indoor unit 2A, it transmits the inspection end signal to the shutoff valve 3E. When the shutoff valve 3E sets its own open / close state to the open state and stops the alarm using the alarm unit 33, it transmits an open state signal to the shutoff valve 3A. When the shutoff valve 3A sets its own open / close state to the open state and stops the alarm using the alarm unit 33, it transmits two open state signals to the indoor unit 2A. When the indoor unit 2A receives two open state signals from the shutoff valve 3A, it transmits two open state signals to the centralized control device 7.

[0238] When the centralized control device 7 receives the two open state signals from the indoor unit 2A, it displays that the shutoff valves 3A and 3E are in the open state in the inspection-related object OB1 displayed on the inspection screen IG. Furthermore, when the centralized control device 7 receives the two open state signals from the indoor unit 2A, it changes the open / closed states of the shutoff valves 3A and 3E recorded in the record R of the remote control wiring group GP1 to the open state.

[0239] [2-3. Effects, etc.] As described above, in the air conditioning system 1000, remote control wiring groups GP are formed that include indoor units 2 and multiple shutoff valves 3. Inspection is performed in units of remote control wiring groups GP. During inspection, the centralized control device 7 displays the open / closed state of each shutoff valve 3 for each remote control wiring group GP that includes multiple shutoff valves 3.

[0240] This allows an inspector to easily check for each shutoff valve 3 whether the shutoff valve 3 is operating normally, even if one remote control wiring group GP includes a plurality of shutoff valves 3.

[0241] (Embodiment 3) Next, a third embodiment will be described. Regarding the configuration of each part of the air conditioning system 1000 in the third embodiment, detailed description of the configuration similar to the configuration of each part of the air conditioning system 1000 in the first embodiment will be omitted as appropriate.

[0242] [3-1.Configuration] In comparison with the first embodiment, the third embodiment includes a plurality of indoor units 2 in at least one of the remote control wiring groups GP formed in the air conditioning system 1000. Furthermore, in the third embodiment, at least one of the plurality of indoor units 2 included in the remote control wiring group GP is an indoor unit 2 that has a refrigerant leakage sensor 25. The remote control wiring group GP in this embodiment is a group that includes the indoor units 2 and devices that are directly or indirectly connected to the indoor units 2 by remote control wiring RL.

[0243] FIG. 22 is a diagram showing the configuration of an air conditioning system 1000 according to the third embodiment. As is clear from a comparison of Fig. 1 and Fig. 22, in this embodiment, the remote control wiring group GP1 includes two indoor units 2, indoor units 2A and 2E. The indoor units 2A and 2E are connected by a remote control wiring RL. The indoor unit 2E is connected to the communication line CL1, just like the indoor unit 2A, and communicates with the centralized control device 7. The indoor unit 2A is an indoor unit 2 that is equipped with a refrigerant leak sensor 25. The indoor unit 2E may or may not be equipped with a refrigerant leak sensor 25.

[0244] [3-2. Operation] Next, the operation of each part of the air conditioning system 1000 according to the third embodiment will be described. In the explanation of this operation, the remote control wiring group GP1 will be taken as an example to explain the differences from the first embodiment.

[0245] When the refrigerant leakage sensor 25 provided in the indoor unit 2A detects a refrigerant leakage, the indoor unit 2A starts air blowing operation and transmits a message to the indoor unit 2E indicating that a refrigerant leakage has been detected. When the indoor unit 2E receives the message indicating that a refrigerant leakage has been detected, it stops operation.

[0246] During inspection, the indoor unit 2A transmits a pseudo leak signal from the detection alarm 5A to the indoor unit 2E. When the indoor unit 2E receives the pseudo leak signal from the indoor unit 2A, it performs air-blowing operation. That is, during inspection, both indoor units 2A and 2E perform air-blowing operation.

[0247] [3-3. Effects, etc.] As explained above, the remote control wiring group GP includes multiple indoor units 2, including an indoor unit 2 with a built-in refrigerant leak sensor 25. When an indoor unit 2 with a built-in refrigerant leak sensor 25 detects a refrigerant leak by the refrigerant leak sensor 25, the indoor unit 2 that detected the refrigerant leak by the refrigerant leak sensor 25 starts fan operation, and the other indoor units 2 included in the same remote control wiring group GP as the indoor unit 2 that detected the refrigerant leak by the refrigerant leak sensor 25 stop operating. When the safety device 6 performs a safety ensuring operation, all indoor units 2 included in the same remote control wiring group GP as the safety device 6 perform fan operation.

[0248] According to this, in the event of a refrigerant leak, some of the indoor units 2 will perform fan operation while other indoor units 2 will stop operating, so the state of the indoor units 2 can be set to a state that takes into account the fact that multiple indoor units 2 in the remote control wiring group GP may each be installed in a different air-conditioned space S. Furthermore, during inspection, all indoor units 2 perform fan operation, so the inspector can check all indoor units 2 to see if they are performing fan operation. Therefore, the indoor units 2 can be set to an appropriate state when a refrigerant leak occurs and during inspection.

[0249] (Fourth embodiment) Next, a fourth embodiment will be described. Regarding the configuration of each part of the air conditioning system 1000 in the fourth embodiment, detailed description of the configuration similar to the configuration of each part of the air conditioning system 1000 in the first embodiment will be omitted as appropriate.

[0250] [4-1.Configuration] In comparison with the first embodiment, the fourth embodiment includes a ventilation device 9 as a safety device 6 in at least one of the remote control wiring groups GP formed in the air conditioning system 1000. The ventilation device 9 is connected to the indoor unit 2 by a remote control wiring RL.

[0251] FIG. 23 is a diagram showing the configuration of an air conditioning system 1000 according to the fourth embodiment. 1 and 23, in this embodiment, the remote control wiring group GP1 further includes a ventilation device 9 instead of the shutoff valve 3A. The ventilation device 9 is connected to the indoor unit 2A via a remote control wiring RL.

[0252] FIG. 24 is an example of the inspection screen IG according to the fourth embodiment. As is clear from a comparison between FIG. 8 and FIG. 24 , in this embodiment, the inspection-related object OB has a sixth area A6. The sixth area A6 is an area that displays information related to the ventilation device 9. If the centralized control device 7 can acquire the operating status of the ventilation device 9, the sixth area A6 displays whether the ventilation device 9 is operating or not. Note that the centralized control device 7 can acquire the operating status of the ventilation device 9 when bidirectional communication is possible between the indoor unit 2 and the ventilation device 9. On the other hand, if the centralized control device 7 cannot acquire the operating status of the ventilation device 9, the sixth area A6 displays that an operation command has been issued to the ventilation device 9 during inspection. Note that the centralized control device 7 cannot acquire the operating status of the ventilation device 9 when communication between the indoor unit 2 and the ventilation device 9 is one-way, from the indoor unit 2 to the ventilation device 9.

[0253] Figure 23 illustrates an example in which the indoor unit 2A and the ventilation device 9 are capable of bidirectional communication. In Figure 24, the inspection-related object OB1 is an inspection-related object OB in the remote control wiring group GP1. Therefore, the inspection-related object OB1 in Figure 24 displays the operating status of the ventilation device 9.

[0254] In this embodiment, information about the ventilation device 9 is recorded in the record R of the remote control wiring group GP including the ventilation device 9. If the centralized control device 7 can acquire the operating status of the ventilation device 9, the information about the ventilation device 9 recorded in the record R indicates the operating status of the ventilation device 9. On the other hand, if the centralized control device 7 cannot acquire the operating status of the ventilation device 9, the information about the ventilation device 9 recorded in the record R indicates that the operating status of the ventilation device 9 cannot be acquired. Furthermore, if a ventilation device 9 does not exist in the remote control wiring group GP, the information about the ventilation device 9 recorded in the record R indicates that the ventilation device 9 does not exist. The inspection-related object OB displays content based on the record R. If the operating status of the ventilation device 9 is recorded in the record R, the inspection-related object OB displays the operating status of the ventilation device 9 as in the inspection-related object OB1 in FIG. 23. Furthermore, if the record R indicates that the operating status of the ventilation device 9 cannot be acquired, the inspection-related object OB displays that an operation command has been issued to the ventilation device 9 when inspection begins. Furthermore, if the record R records that the ventilation device 9 does not exist, the inspection-related object OB does not display anything in the sixth area A6.

[0255] [4-2. Operation] Next, the operation of each part of the air conditioning system 1000 according to the fourth embodiment will be described. In the explanation of this operation, the remote control wiring group GP1 will be taken as an example to explain the differences from the first embodiment.

[0256] When the indoor unit 2A receives the pseudo leak signal from the detection alarm device 5A, it sends a signal to the ventilation device 9 instructing it to operate. When the ventilation device 9 receives this signal from the indoor unit 2A, it starts operating. Next, the ventilation device 9 sends a signal indicating that it has operated to the indoor unit 2A. The indoor unit 2A sends a signal indicating that the ventilation device 9 has operated to the centralized control device 7, along with sending the closed state signal.

[0257] When the centralized control device 7 receives a signal from the indoor unit 2A indicating that the ventilation device 9 has started operating, it displays that the ventilation device 9 is operating in the inspection-related object OB1 displayed on the inspection screen IG. Furthermore, when the centralized control device 7 receives a signal indicating that the ventilation device 9 has started operating, it changes the information about the ventilation device 9 recorded in the record R of the remote control wiring group GP1 to indicate that it is operating.

[0258] When the indoor unit 2A receives the inspection completion signal from the centralized control device 7, it sends a signal to the ventilation device 9 instructing it to stop operation. When the ventilation device 9 receives this signal from the indoor unit 2A, it stops operation. Next, the ventilation device 9 sends a signal indicating that it has stopped operating to the indoor unit 2A. The indoor unit 2A sends a signal indicating that the ventilation device 9 has stopped operating to the centralized control device 7 together with the open state signal.

[0259] When the centralized control device 7 receives a signal from the indoor unit 2A indicating that the ventilation device 9 has started operation, it displays that the ventilation device 9 is stopped in the inspection-related object OB1 displayed on the inspection screen IG. Furthermore, when the centralized control device 7 receives a signal indicating that the ventilation device 9 has stopped operating, it changes the information about the ventilation device 9 recorded in the record R of the remote control wiring group GP1 to indicate that it is stopped.

[0260] [4-3. Effects, etc.] As described above, if the centralized control device 7 can obtain the operating status of the ventilation device 9, it displays the operating status of the ventilation device 9 during inspection, and if the centralized control device 7 cannot obtain the operating status of the ventilation device 9, it displays that it has instructed the ventilation device 9 to operate during inspection.

[0261] According to this, when the centralized control device 7 can acquire the operating status of the ventilation device 9, the inspector can easily check the operating status of the ventilation device 9. Furthermore, when the centralized control device 7 cannot acquire the operating status of the ventilation device 9, the inspector can easily confirm that an instruction to operate the ventilation device 9 has been issued. In other words, the inspector can confirm some information regarding the ventilation device 9. This improves the convenience of the inspector during inspection.

[0262] (Embodiment 5) Next, a fifth embodiment will be described. Regarding the configuration of each part of the air conditioning system 1000 in the fifth embodiment, detailed description of the configuration similar to the configuration of each part of the air conditioning system 1000 in the first embodiment will be omitted as appropriate.

[0263] [5-1.Configuration] In comparison with the first embodiment, the fifth embodiment has a feature that some of the remote control wiring groups GP formed in the air conditioning system 1000 include a plurality of remote control wiring groups GP including the same shutoff valve 3 .

[0264] FIG. 25 is a diagram showing the configuration of an air conditioning system 1000 according to the fifth embodiment. As is clear from a comparison of Figures 1 and 25, in this embodiment, the shutoff valve 3A shuts off the flow of refrigerant to the indoor units 2A and 2B. Also, as is clear from a comparison of Figures 1 and 25, the indoor unit 2B and the shutoff valve 3A are connected by a remote control wiring RL. Also, in Figure 25, the remote control wiring group GP1 and the remote control wiring group GP2 include the shutoff valve 3A.

[0265] FIG. 26 is a diagram showing an example of an inspection screen IG according to the fifth embodiment. As is clear from a comparison of FIG. 8 and FIG. 26, in this embodiment, the inspection-related object OB has a seventh area A7. The seventh area A7 displays the identification information of the shutoff valve 3. Also, as is clear from a comparison of FIG. 8 and FIG. 26, in this embodiment, the name displayed in the second display area A2 includes the identification information of the shutoff valve 3. In this way, the inspection screen IG of this embodiment displays the identification information of the shutoff valve 3, and also displays the name of the remote control wiring group GP including the identification information of the shutoff valve 3, thereby displaying the correspondence between the shutoff valve 3 and the remote control wiring group GP.

[0266] In this embodiment, the record R further records identification information of the shutoff valve 3. Therefore, on the inspection screen IG, the identification information of the shutoff valve 3 is displayed in the seventh area A7.

[0267] In this embodiment, the inspection-related objects OB displayed on the inspection screen IG can be filtered and sorted using the identification information of the shutoff valve 3. Even if the shutoff valve 3 is shared by remote control wiring groups GP that have significantly different names, the inspector can easily confirm the correspondence between the shutoff valve 3 and the remote control wiring group GP.

[0268] [5-2. Operation] Next, the operation of each part of the air conditioning system 1000 according to the fifth embodiment will be described. In the explanation of this operation, differences from the first embodiment will be explained using the remote control wiring groups GP1 and GP2 as an example.

[0269] When remote control wiring groups GP1 and GP2 are selected as inspection targets on the inspection screen IG, the centralized control device 7 sends an inspection start signal to one of the indoor units 2A and 2E, and sends a shutoff valve operation no-go signal along with the inspection start signal to the other of the indoor units 2A and 2E. The shutoff valve operation no-go signal indicates that it is not necessary to operate the shutoff valve 3. When the indoor unit 2 receives the shutoff valve operation no-go signal, it does not send a close state instruction signal to the shutoff valve 3A even if it receives a pseudo leak signal from the detection alarm 5A. This causes the shutoff valve 3A to close only when either the remote control wiring group GP1 or GP2 is inspected. Note that if the remote control wiring groups GP1 and GP2 are inspected at different times, the shutoff valve 3A transitions to the close state each time an inspection is performed.

[0270] [5-3. Effects, etc.] As described above, a plurality of remote control wiring groups GP include the same shutoff valve 3. The inspection screen IG further displays the correspondence between the remote control wiring groups GP and the shutoff valves 3.

[0271] With this, even if a common shutoff valve 3 is included in multiple remote control wiring groups GP, the open / closed state of the shutoff valve 3 can be easily confirmed while checking which remote control wiring group GP the shutoff valve 3 is included in.

[0272] When there are multiple remote control wiring groups GP to be inspected and the multiple remote control wiring groups GP to be inspected include the same shut-off valve 3, the shut-off valves 3 included in the multiple remote control wiring groups GP to be inspected perform safety operations to ensure safety from refrigerant leakage only when one remote control wiring group GP is inspected.

[0273] This prevents the same shutoff valve 3 from being closed multiple times during inspection.

[0274] (Embodiment 6) Next, a sixth embodiment will be described. Regarding the configuration of each part of the air conditioning system 1000 in the sixth embodiment, detailed description of the configuration similar to the configuration of each part of the air conditioning system 1000 in the first embodiment will be omitted as appropriate.

[0275] [6-1.Configuration] In the sixth embodiment, the centralized control device 7 notifies the inspector of the necessity of inspection. In this embodiment, the centralized control device 7 notifies the user of the need for inspection by displaying a message, but the centralized control device 7 may also notify the user of the need for inspection by sending an email or the like.

[0276] The centralized control device 7 has three modes for notifying the need for inspection: a first notification mode, a second notification mode, and a third notification mode, and notifies the need for inspection in any of these notification modes.These modes can be switched by the inspector.

[0277] The first notification mode is a mode in which, among all remote control wiring groups GP in the target property or target refrigerant system RS, the group with the oldest last inspection date and time is notified of the need for inspection of that remote control wiring group GP when a specified period (e.g., 10 months) has passed. The second notification mode is a mode in which a notification of the need for inspection is sent for each air-conditioned space S. The second notification mode is a notification mode that is intended for sequential inspection of vacant rooms, such as in a hotel. The third notification mode is a mode in which the inspector is notified of the need for inspection for each combination of multiple remote control wiring groups GP selected. In the third notification mode, an operation to select a remote control wiring group GP is accepted from the inspector, and the accepted remote control wiring group GP is stored in memory 720 or the like. The third notification mode is a notification mode that assumes an inspection mode in which an inspector inspects specific remote control wiring groups GP collectively. Note that in the third notification mode, a remote control wiring group GP may be automatically selected according to predetermined conditions.

[0278] The notification recipient is preferably a company that performs the inspection work. This is because facility owners and the like generally have contracts for inspections with inspection companies. The notification recipient may be set by the facility owner or manager at will, including themselves, on the assumption that the facility owner or manager may also perform inspections as an inspector.

[0279] [6-2. Operation] Next, the operation of each part of the air conditioning system 1000 according to the fourth embodiment will be described. In the explanation of this operation, differences from the first embodiment will be explained.

[0280] When the mode for notifying the need for inspection is the first notification mode, the management control unit 70 references the inspection dates and times of all records R in the management data 722 and identifies the oldest inspection date and time among the referenced inspection dates and times. Next, the management control unit 70 compares the identified inspection date and time with the current date and time, and if the time difference between the identified inspection date and time and the current date and time is greater than a predetermined period (e.g., 10 months), notifies the need for inspection of the remote control wiring group GP via the touch panel 72. This predetermined period is preferably shorter than the inspection period required by law or regulation. The inspection period required by law or regulation is, for example, once a year.

[0281] When the mode for notifying the need for inspection is the second notification mode, the management control unit 70 manages each remote control wiring group GP in association with the air-conditioned space S. Then, the management control unit 70 references the inspection date and time of each remote control wiring group GP corresponding to the air-conditioned space S, and compares the referenced inspection date and time with the current date and time. Next, when the time difference between the referenced inspection date and time and the current date and time is greater than a predetermined period (for example, 10 months), the management control unit 70 notifies the need for inspection of the air-conditioned space S corresponding to the remote control wiring group GP via the touch panel 72. At this time, it is preferable to display the name of the air-conditioned space S that needs inspection and the name of the corresponding remote control wiring group GP together.

[0282] When the mode for notifying the need for inspection is the third notification mode, the management control unit 70 manages the combination information of the remote control wiring groups GP selected by the inspector and determines the need for inspection for each combination. Specifically, the management control unit 70 references the inspection date and time in record R for each remote control wiring group GP corresponding to the selected combination and compares the referenced inspection date and time with the current date and time. Next, if there is a remote control wiring group GP for which the time difference between the referenced inspection date and time and the current date and time is greater than a predetermined period (e.g., 10 months), the management control unit 70 notifies the need for inspection of the remote control wiring group GP and other remote control wiring groups GP selected as the same combination as the relevant group, along with the names of the remote control wiring groups GP, via the touch panel 72.

[0283] [6-3. Effects, etc.] The centralized control device 7 notifies the user of the necessity of inspection when a predetermined period of time has passed since the previous inspection.

[0284] This allows the inspector to become aware of the need for inspection, increasing the likelihood that the inspector will be able to carry out the inspection at the appropriate time.

[0285] The centralized control device 7 notifies the remote control wiring group GP that has the oldest date and time of the previous inspection among all the remote control wiring groups GP that the remote control wiring group GP needs to be inspected if a predetermined period of time has passed since the previous inspection.

[0286] This increases the possibility that an inspector can inspect the remote control wiring group GP, which is most in need of inspection, at the appropriate time.

[0287] The centralized control device 7 accepts an operation to select a combination of remote control wiring groups GP for which to notify the need for inspection, and if the remote control wiring groups GP related to the selected combination have the remote control wiring group GP with the oldest date and time of the previous inspection, the centralized control device 7 notifies the need for inspection when a predetermined period has passed since the previous inspection was performed on that remote control wiring group GP and the other remote control wiring groups GP selected in the combination.

[0288] This increases the possibility that the inspector can inspect the remote control wiring group GP selected by the inspector at the appropriate time. Also, notifications can be sent that are in line with the inspector's inspection implementation.

[0289] (Embodiment 7) Next, a seventh embodiment will be described. Regarding the configuration of each part of the air conditioning system 1000 in the seventh embodiment, detailed description of the configuration similar to the configuration of each part of the air conditioning system 1000 in the first embodiment will be omitted as appropriate.

[0290] [7-1.Configuration] The seventh embodiment is different from the first embodiment in the inspection screen IG. FIG. 27 is a diagram showing an example of an inspection screen IG according to the seventh embodiment. 8 and 27, in this embodiment, the inspection-related object OB1 has an eighth area A8. The eighth area A8 displays whether or not a person is present in the air-conditioned space S. Each record R records whether or not a person is present in the air-conditioned space S, and the management control unit 70 displays the presence or absence of a person in the eighth area A8 of the inspection screen IG based on this information recorded in the record R.

[0291] [7-2. Operation] Next, the operation of each part of the air conditioning system 1000 according to the seventh embodiment will be described. In the explanation of this operation, differences from the first embodiment will be explained.

[0292] A human presence sensor connected to the indoor unit 2 is placed in the air-conditioned space S, and the detection value of the human presence sensor is transmitted to the centralized management device 7 via the indoor unit 2. Then, the management control unit 70 records in record R whether or not a person is present based on the received detection value of the human presence sensor.

[0293] [7-3. Effects, etc.] The inspection screen IG displays, for each remote control wiring group GP, whether or not a person is present in the air-conditioned space S of the indoor units 2 belonging to that remote control wiring group GP.

[0294] This allows the inspector to start the inspection at a time when no people are present.

[0295] (Embodiment 8) Next, an eighth embodiment will be described. Regarding the configuration of each part of the air conditioning system 1000 in the eighth embodiment, detailed description of the configuration similar to the configuration of each part of the air conditioning system 1000 in the first embodiment will be omitted as appropriate.

[0296] [8-1.Configuration] The eighth embodiment is different from the first embodiment in the inspection screen IG.

[0297] FIG. 28 is a diagram showing an example of an inspection screen IG according to the eighth embodiment. As is clear from a comparison between FIG. 8 and FIG. 28, in this embodiment, the inspection-related object OB has a ninth area A9. The ninth area A9 displays whether or not the indoor units 2 included in the corresponding remote control wiring group GP are performing air conditioning operation. If the indoor units 2 are not performing air conditioning operation, the ninth area A9 displays the word "No," and if the indoor units 2 are performing air conditioning operation, the ninth area A9 displays the word "Performed." Each record R records whether or not air conditioning operation is being performed, and the management control unit 70 displays whether or not the indoor units 2 are performing air conditioning operation in the ninth area A9 of the inspection screen IG based on this information recorded in the record R.

[0298] [8-2. Operation] Next, the operation of each part of the air conditioning system 1000 according to the eighth embodiment will be described. In the explanation of this operation, differences from the first embodiment will be explained.

[0299] The indoor units 2 of this embodiment transmit information indicating whether or not air conditioning operation is being performed to the centralized management device 7. The management control unit 70 then updates the corresponding record R based on this received information.

[0300] [8-3. Effects, etc.] This allows the inspector to start the inspection at a time when the indoor unit 2 is not being used.

[0301] (Embodiment 9) Next, a ninth embodiment will be described. Regarding the configuration of each part of the air conditioning system 1000 in the ninth embodiment, detailed description of the configuration similar to the configuration of each part of the air conditioning system 1000 in the first embodiment will be omitted as appropriate.

[0302] [9-1.Configuration] The ninth embodiment is different from the first embodiment in the inspection screen IG.

[0303] FIG. 29 is a diagram showing an example of an inspection screen IG according to the ninth embodiment. As is clear from a comparison of FIG. 8 and FIG. 29, in this embodiment, the fifth area A5 of the inspection-related object OB displays, in addition to the open / closed state of the shutoff valve 3, information indicating that the shutoff valve 3 has been operated in conjunction with the execution of the inspection. The fifth area A5 of the inspection-related object OB1 shown in FIG. 29 displays the character string "controlled to close." "Closed" indicates the open / closed state of the shutoff valve 3, and "controlled" is information indicating that the shutoff valve 3 has been operated in conjunction with the execution of the inspection. Note that the information indicating that the shutoff valve 3 has been operated in conjunction with the execution of the inspection is not limited to this character string, and may be "controlled," "controlled in conjunction with the execution of the inspection," "open → closed," or any other form that indicates that the shutoff valve 3 has been operated in conjunction with the execution of the inspection.

[0304] [9-2. Operation] The operation according to the ninth embodiment is the same as that according to the first embodiment.

[0305] [9-3. Effects, etc.] During the inspection, the centralized control device 7 further displays information indicating that the shutoff valve 3 has been operated in conjunction with the execution of the inspection.

[0306] This allows the inspector to easily know whether or not the shutoff valve 3 has been operated in conjunction with the execution of the inspection.

[0307] (Other embodiments) As described above, the above-mentioned embodiments 1 to 9 have been described as examples disclosed in the present application. However, the technology in the present disclosure is not limited to these, and can be applied to embodiments in which modifications, substitutions, additions, omissions, etc. are made. Furthermore, it is also possible to combine the components described in the above-mentioned embodiments 1 to 9 to create new embodiments. Therefore, other embodiments will be exemplified below.

[0308] In other embodiments related to the seventh embodiment, the inspection screen IG may display whether a room is being used or not based on room management information. For example, if the room, i.e., the air-conditioned space S, is a conference room, the room management information is reservation information for the conference room. Also, for example, if the air-conditioned space S is a hotel guest room, the room management information is reservation information for the guest room, check-in time for the guest room, check-out time for the guest room, etc.

[0309] In another embodiment related to the ninth embodiment, when the ventilation device functions as a "safety device," information indicating that the ventilation device was activated in conjunction with an inspection is further displayed. In this case, "Operating" is displayed when the ventilation device is operating, and "Stopped" is displayed when the ventilation device is stopped. If an instruction to operate the ventilation device is given in conjunction with an inspection, for example, a message such as "Ventilation control completed in conjunction with inspection" or a string such as "Stopped → On" may be displayed. At this time, the ventilation airflow rate of the ventilation device may also be displayed. Generally, in the event of a refrigerant leak, it is desirable to ventilate at maximum airflow rate to quickly reduce the refrigerant concentration in the room. Therefore, displaying the ventilation airflow rate during inspection can improve the ease of inspection. Such a display content may be "Ventilation Rate: Max." In addition, in another embodiment, if an inspection is performed with the shutoff valve 3 closed, the shutoff valve 3 may be opened and then closed again. This allows the inspection to confirm whether the shutoff valve 3 closes normally when a refrigerant leak is detected, thereby improving safety. In this case, the fifth area A5 may display that the shutoff valve was opened and then shut off. The display content may be, for example, "closed → open → closed." In another embodiment, if an inspection is performed while the ventilation device is operating, the inspection control may be such that the ventilation device is stopped and then the re-ventilation device is operated. This makes it possible to confirm through inspection that the ventilation device is operating normally when a refrigerant leak is detected, thereby improving safety. In this case, the display area related to the ventilation device may display that the ventilation device has stopped and then resumed operation. The display content may be, for example, "operating → stopped → operating."

[0310] In the embodiment described above, the number of remote control wiring groups GP formed in the air conditioning system 1000 is four. In other embodiments, the number of remote control wiring groups GP formed in the air conditioning system 1000 may be three or less, or five or more.

[0311] In the above-described embodiment, the number of refrigerant systems RS included in the air conditioning system 1000 is two. In other embodiments, the number of refrigerant systems RS included in the air conditioning system 1000 may be one, or three or more.

[0312] In the above-described embodiment, the number of outdoor units 1 belonging to each refrigerant system RS is one. In other embodiments, the number of outdoor units 1 belonging to each refrigerant system RS may be two or more.

[0313] In the embodiment described above, each remote control wiring group GP includes one detection alarm device 5. In other embodiments, each remote control wiring group GP may include multiple detection alarm devices 5.

[0314] In embodiments other than the above-described embodiment 3, each remote control wiring group GP includes one indoor unit 2. In embodiments other than embodiment 3, each remote control wiring group GP may include multiple indoor units 2. In this case, the remote control wiring group GP is a group that includes the indoor unit 2 and devices that are directly or indirectly connected to the indoor unit 2 by remote control wiring RL.

[0315] In the second embodiment described above, a plurality of shutoff valves 3 are included in one remote control wiring group GP, but a plurality of remote control wiring groups GP may each include a plurality of shutoff valves 3.

[0316] In the third embodiment described above, a configuration is used in which one remote control wiring group GP includes a plurality of indoor units 2, but a plurality of indoor units 2 may be included in each of a plurality of remote control wiring groups GP.

[0317] In the fourth embodiment described above, the ventilation device 9 is included in one remote control wiring group GP, but the ventilation device 9 may be included in each of a plurality of remote control wiring groups GP.

[0318] In the fifth embodiment described above, the same shutoff valve 3 is included in two remote control wiring groups GP, but the same shutoff valve 3 may be included in three or more remote control wiring groups GP.

[0319] In the above-described embodiment, the remote control wiring group GP is exemplified as the "predetermined group." In other embodiments, the "predetermined group" may be any one of a refrigerant system group, a shutoff valve group, and a conditioned space group. The refrigerant system group is a group that includes an outdoor unit 1, a shutoff valve 3 that belongs to the same refrigerant system RS as this outdoor unit 1, an indoor unit 2 that belongs to the same refrigerant system RS as this outdoor unit 1, and each device connected to this indoor unit 2. The shutoff valve group is a group including a shutoff valve 3, an indoor unit 2 connected to this shutoff valve 3, and each device connected to this indoor unit 2. The air-conditioned space group is a group that includes the indoor units 2 that air-condition the air-conditioned space, the shutoff valves 3 connected to these indoor units 2, and each device connected to these indoor units 2.

[0320] In the above-described embodiment, the indoor unit 2 is configured to perform the fan operation when inspection starts. In other embodiments, the indoor unit 2 does not have to perform the fan operation that accompanies the start of inspection.

[0321] In the above-described embodiment, the inspection start instruction and the inspection end instruction are received in units of remote control wiring groups GP. In other embodiments, the inspection start instruction and the inspection end instruction may be received in units of indoor units 2.

[0322] In another embodiment related to embodiment 7, a check box CB may be automatically checked for a remote control wiring group GP that includes an indoor unit 2 that conditions an unoccupied air-conditioned space S. In this other embodiment, a centralized control device 7 may automatically send an inspection start signal to a remote control wiring group GP that includes an indoor unit 2 that conditions an unoccupied air-conditioned space S.

[0323] In another embodiment, the inspection screen IG may be displayed on a portable terminal carried by an inspector instead of the centralized control device 7. In this case, the portable terminal carried by the inspector communicates with each indoor unit 2 via the centralized control device 7.

[0324] In another embodiment, the inspection screen IG may display the operating status of the safety device 6, such as whether the detection alarm 5 has sounded or not, instead of or together with the open / closed state of the shutoff valve 3.

[0325] In other embodiments, the inspection screen IG may display whether or not the indoor unit 2 is in air-blowing operation, instead of or together with the open / closed state of the shutoff valve 3.

[0326] In facilities with a large number of air-conditioned spaces S, inspections are expected to be performed on a remote control wiring group GP basis, while in facilities with a small number of air-conditioned spaces S, inspections are expected to be performed on all remote control wiring groups GP included in the refrigerant system RS. Therefore, in another embodiment, the indoor unit remote control 4 may display a recommendation as to whether inspection of only the remote control wiring group GP to which it belongs is preferable, or inspection of all remote control wiring groups GP included in the refrigerant system RS. In this case, for example, the indoor unit remote control 4 stores the number of indoor units 2 in the refrigerant system RS, and recommends the former inspection if the stored number of indoor units 2 is equal to or less than a predetermined number, and recommends the latter inspection if the stored number of indoor units 2 is greater than the predetermined number.

[0327] In other embodiments, the detection alarm 5 may receive inspection start instructions and inspection end instructions in the same way as the indoor unit remote control 4. In other embodiments, the detection alarm 5 may also display the same information as the indoor unit remote control 4. In other words, the detection alarm 5 may display the open / closed state of the shutoff valves 3 in the remote control wiring group GP to which it belongs. In this other embodiment, the detection alarm device 5 corresponds to an example of a "terminal device." In this other embodiment, the control program 521 corresponds to an example of a "program."

[0328] In another embodiment, the first code, the second code, and the inspection date and time may be displayed by the indoor unit remote control 4, the detection alarm 5, and an alarm disposed in the air-conditioned space S. In this other embodiment, the detection alarm device 5 corresponds to an example of a "terminal device." In this other embodiment, the control programs 421 and 521 correspond to an example of a "program."

[0329] In another embodiment, when the communication connection between the shutoff valve 3 and the indoor unit 2 is cut off, the fifth display area A5 of the inspection-related object OB may display an error code.

[0330] In another embodiment, if the remote control wiring group GP does not include a shut-off valve 3, the fifth display area A5 of the inspection-related object OB may display information indicating that there is no shut-off valve 3, such as the character "-".

[0331] The inspection date and time displayed by the inspection-related object may be configured to be returned to the date and time before it was updated to the date and time when the inspection start button B3 was operated if the inspection is forcibly terminated. This allows the worker to identify the remote control wiring groups GP for which the inspection was not completed successfully, which can be useful for conducting additional inspections as appropriate. In this case, the date and time when the "inspection completed" operation was performed may be updated as the inspection date and time. Alternatively, the date and time when the "inspection execution" operation was performed may be recorded, and the inspection date and time may be updated when the "inspection completed" operation is performed, but the inspection date and time may not be updated if the "inspection completed" operation is not performed. Furthermore, the inspection date and time displayed by the inspection-related object OB may be configured not to be updated to the date and time when the inspection start button B3 is operated, but to be updated only to the date and time when the inspection end button B4 is operated.

[0332] If the centralized control device 7 itself is equipped with an alarm function for refrigerant leakage, the centralized control device 7 may issue an alarm during inspection. In this case, the centralized control device 7 may be configured to be able to stop issuing its own alarm only by operating it.

[0333] In another embodiment, the outdoor unit 1 may receive an inspection start instruction and an inspection end instruction for all of the remote control wiring groups GP included in the refrigerant system RS.

[0334] The processors 100, 200, 300, 400, 500, and 700 may be configured by a single processor or by multiple processors. These processors may be hardware programmed to realize the corresponding functional units. That is, these processors may be configured by, for example, an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array).

[0335] The configurations of the components of the air conditioning system 1000 shown in Figures 2 to 7 are merely examples, and the specific implementation form is not particularly limited. In other words, it is not necessary to implement hardware that corresponds to each component individually, and it is also possible to implement a configuration in which a single processor executes a program to realize the functions of each component. Furthermore, some of the functions realized by software in the above-described embodiments may be implemented by hardware, or some of the functions realized by hardware may be implemented by software.

[0336] The step units of the operations shown in Figures 9, 12, 14, 16, 17, 18, and 19 are divided according to the main processing content to make the operations easier to understand, and the operation is not limited by the way the processing units are divided or the names of the processing units. The operations may be divided into more step units depending on the processing content. Furthermore, one step unit may be divided so that it includes more processing. Furthermore, the order of the steps may be changed as appropriate within the scope of the present disclosure.

[0337] It should be noted that the above-described embodiments are intended to illustrate the technology of the present disclosure, and various modifications, substitutions, additions, omissions, etc. may be made within the scope of the claims or their equivalents.

[0338] (Addendum) The above description of the embodiments discloses the following techniques.

[0339] (Technology 1) An air conditioning system comprising a safety device for ensuring safety from refrigerant leakage and a terminal device, wherein the terminal device displays a first code when a refrigerant leakage occurs, and displays a second code different from the first code when an inspection is being conducted to determine whether the safety device is operating normally in the event of a refrigerant leakage. According to this, if a refrigerant leak occurs, the first code is displayed, and if a refrigerant leak occurs and an inspection is being conducted to determine whether the safety device is operating normally, the second code is displayed. This makes it easy to distinguish between whether a refrigerant leak has occurred and whether an inspection is being conducted to determine whether the safety device is operating normally.

[0340] (Technology 2) The air conditioning system according to Technology 1, wherein the terminal device further displays an inspection date and time, which is the date and time when the inspection was performed. This allows the inspector to be supported in carrying out the next inspection at the appropriate time by displaying the inspection date and time.

[0341] (Technology 3) The air conditioning system described in Technology 2, wherein the inspection is forcibly terminated if it has not been completed within a predetermined period of time since it started, and the terminal device updates the inspection date and time displayed to the date and time the inspection ended if the inspection is completed within the predetermined period of time since it started, but does not update the inspection date and time displayed to the date and time the inspection ended if the inspection is forcibly terminated. This prevents the displayed inspection date and time from being updated to the date and time the inspection ended, even if the inspection was forcibly terminated, thereby further supporting the inspector so that the next inspection can be performed at an appropriate time.

[0342] (Technology 4) The air conditioning system according to any one of Technology 1 to Technology 3, wherein the terminal device notifies the user of the need for the inspection when a predetermined period of time has passed since the last time the inspection was performed. This allows the inspector to become aware of the need for inspection, increasing the likelihood that the inspector will be able to carry out the inspection at the appropriate time.

[0343] (Technology 5) An air conditioning system according to Technology 4, which is provided with a plurality of the safety devices, in which predetermined groups each including the safety devices are formed in the air conditioning system, the inspection is performed on a group-by-group basis, and the terminal device notifies the need for inspection of all the predetermined groups when the predetermined period has elapsed since the last inspection was performed on the predetermined group with the oldest date and time of the last inspection. This increases the likelihood that inspectors will be able to inspect all of the specified groups at the appropriate time, and also makes it possible to provide notifications that are tailored to the inspectors' inspection practices.

[0344] (Technology 6) An air conditioning system according to Technology 4, which is provided with a plurality of the safety devices, in which predetermined groups each including the safety devices are formed in the air conditioning system, the inspection is performed on a group-by-group basis, the terminal device accepts an operation to select the predetermined group to be notified of the need for the inspection, and notifies the predetermined group with the oldest date and time of the previous inspection of the selected predetermined group of the need for the inspection when the predetermined period has elapsed since the previous inspection. This increases the likelihood that an inspector can inspect a specific group selected by the inspector at an appropriate time. Also, notifications can be sent that are tailored to the inspector's inspection practices.

[0345] (Technology 7) A program that causes a processor of a terminal device to display a first code when a refrigerant leak occurs, and displays a second code different from the first code when an inspection is being conducted to determine whether a safety device that ensures safety from a refrigerant leak is operating normally in the event of a refrigerant leak. This provides the same effects as the air conditioning system described in Technique 1.

[0346] (Technology 8) A display method in which a terminal device displays a first code when a refrigerant leak has occurred, and displays a second code different from the first code when an inspection is being conducted to determine whether a safety device that ensures safety from a refrigerant leak is operating normally in the event of a refrigerant leak. This provides the same effects as the air conditioning system described in Technique 1. [Industrial Applicability]

[0347] As described above, the air conditioning system, program, and display method according to the present invention can be used to check whether a safety device operates normally when a refrigerant leak occurs. [Explanation of symbols]

[0348] 1, 1A, 1B outdoor unit 2, 2A, 2B, 2C, 2D, 2E indoor unit 3, 3A, 3B, 3C, 3D, 3E Shutoff valve (safety device) 4, 4A, 4B, 4C, 4D Indoor unit remote control (terminal device) 5, 5A, 5B, 5C, 5D Detection alarm (alarm, safety device, terminal device) 6 Safety equipment 7 Centralized control device (terminal device) 8 Terminal Equipment 9 Ventilation equipment (safety equipment) 25 Refrigerant leak sensor 400 processors 421 Control Program (Program) 500 processors 521 Control Program (Program) 700 processor 721 Control Program (Program) 1000 Air Conditioning System GP, GP1, GP2, GP3, GP4 remote control wiring group (prescribed group) RS, RS1, RS2 Refrigerant system S, S1, S2, S3, S4 Conditioned space

Claims

1. A safety device to ensure safety from refrigerant leakage; a terminal device, The terminal device If a refrigerant leak occurs, the first code is displayed. When a check is being performed to determine whether the safety device operates normally in the event of a refrigerant leak, a second code different from the first code is displayed. Air conditioning system.

2. The terminal device further displays an inspection date and time, which is the date and time when the inspection was performed. The air conditioning system of claim 1 .

3. If the inspection has not been completed within a predetermined period of time since it began, it will be forcibly terminated. The terminal device If the inspection is completed within the predetermined period after the start of the inspection, the inspection date and time to be displayed is updated to the date and time when the inspection was completed, but if the inspection is forcibly terminated, the inspection date and time to be displayed is not updated to the date and time when the inspection was completed.

3. The air conditioning system of claim 2.

4. The terminal device notifying the user of the necessity of said inspection when a predetermined period of time has elapsed since said inspection was last performed; The air conditioning system of claim 1 .

5. a plurality of the safety devices; In the air conditioning system, a predetermined group including the safety device is formed, The inspection is performed in units of the predetermined group, The terminal device When the predetermined period has elapsed since the last inspection was performed on the predetermined group with the oldest date and time of the last inspection among all the predetermined groups, notifying all of the predetermined groups of the need for inspection; 5. The air conditioning system of claim 4.

6. a plurality of the safety devices; In the air conditioning system, a predetermined group including the safety device is formed, The inspection is performed in units of the predetermined group, The terminal device accepting an operation to select the predetermined group to be notified of the need for inspection; among the selected predetermined groups, for the predetermined group for which the date and time of the previous inspection was conducted is the oldest, notifying the need for the inspection when the predetermined period has elapsed since the previous inspection was conducted.

5. The air conditioning system of claim 4.

7. To the processor of the terminal device If a refrigerant leak occurs, the first code is displayed. When a check is being performed to determine whether a safety device for ensuring safety from refrigerant leakage is operating normally in the event of a refrigerant leakage, a second code different from the first code is displayed. program.

8. The terminal device If a refrigerant leak occurs, the first code is displayed. When a check is being conducted to determine whether a safety device for ensuring safety from refrigerant leakage is operating normally in the event of a refrigerant leak, a second code different from the first code is displayed. Display method.

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