Air conditioning system

Abstract

An air conditioning system (100) comprises: a heat source (10); a first indoor unit (20a); a first cut-off unit (30a); a control device; and a display. The heat source (10) and the first indoor unit (20a) are connected by first piping (121). The first cut-off unit (30a) closes the first piping (121) by means of first cut-off valves if refrigerant leakage is detected. The control device acquires configuration information by communicating with the first cut-off unit (30a) and the first indoor unit (20a). The configuration information includes information pertaining to the first cut-off unit (30a) and to the first indoor unit (20a). If the control device receives a startup command, the control device controls the air conditioning system so that the same enters an interlocked state. In the interlocked state, the display displays the configuration information. If the control device receives information indicating a user's approval, the control device releases the interlocked state.

Description

air conditioning system

[0001] The present disclosure relates to air conditioning systems.

[0002] Air conditioning systems are required to have sufficient safety measures against refrigerant leaks. JP 2019-52785 A (Patent Document 1) discloses an air conditioning system equipped with devices to prepare for refrigerant leaks, such as a gas sensor that detects refrigerant leaks, an alarm device, and a shutoff valve that shuts off the flow of refrigerant.

[0003] JP 2019-52785 A

[0004] Equipment to prepare for refrigerant leaks must be installed appropriately in an air conditioning system. Therefore, building contractors must verify that the equipment to prepare for refrigerant leaks is installed in the air conditioning system according to the design. However, the type of equipment to prepare for refrigerant leaks may differ depending on the environment in which the air conditioning system is installed. For this reason, contractors must carefully verify that the equipment to prepare for refrigerant leaks is installed according to the design drawings. Therefore, in the past, such verification work was a burden on contractors, which was a problem.

[0005] The present disclosure has been made to explain an embodiment that solves the above-mentioned problems, and its purpose is to provide an air conditioning system that can reduce the workload of a contractor when checking that equipment to prepare for refrigerant leaks has been installed according to the design drawings.

[0006] The present disclosure relates to an air conditioning system. The air conditioning system includes a heat source unit, a first indoor unit having a heat exchanger that exchanges heat with the heat source unit via a refrigerant and that blows conditioned air into a space to be air-conditioned, a first shutoff unit having a first shutoff valve, a control device, and a display, the heat source unit and the first indoor unit are connected by a first pipe through which a refrigerant flows, the first indoor unit has a sensor terminal for connecting a refrigerant sensor that detects a refrigerant leak, the first shutoff unit closes the first pipe with the first shutoff valve when the refrigerant sensor detects a refrigerant leak, the control device communicates with the first shutoff unit and the first indoor unit to acquire configuration information related to devices to prepare for a refrigerant leak, the configuration information including information about each of the first shutoff unit and the first indoor unit, the control device controls the air conditioning system to an interlock state in which air conditioning operation is prohibited when a start command for the air conditioning system is received, the display displays the configuration information in the interlock state, and the control device releases the interlock state when information indicating a user's approval of the configuration information is received.

[0007] According to the air conditioning system of the present disclosure, it is possible to provide an air conditioning system that can reduce the workload imposed on construction companies when checking that equipment to prepare for refrigerant leaks has been installed according to the design drawings.

[0008] 10 is a diagram illustrating an example of the configuration of an air conditioning system. FIG. 11 is a diagram illustrating a basic pattern for configuring an air conditioning system. FIG. 12 is a diagram illustrating the positional relationship between an indoor unit, a shutoff unit, an alarm unit, and a remote controller. FIG. 13 is a diagram illustrating an overview of the configuration of the shutoff unit. FIG. 14 is a block diagram illustrating the configurations of an outdoor unit, an indoor unit, a shutoff unit, and an alarm unit. FIG. 15 is a sequence diagram illustrating the processing flow when a refrigerant leak is detected by a refrigerant sensor provided in an indoor unit. FIG. 16 is a sequence diagram illustrating the processing flow when a refrigerant leak is detected by a refrigerant sensor provided in an alarm unit. FIG. 17 is a flowchart illustrating the processing by which the shutoff unit closes the shutoff valve in the event of a power outage. FIG. 18 is a flowchart illustrating the processing by which an indoor unit disables and enables the function of a refrigerant sensor in accordance with operation of a sensor setting switch. FIG. 19 is a diagram illustrating another example of the configuration of an air conditioning system. FIG. 19 is a diagram illustrating communication paths of the air conditioning system shown in FIG. 10. FIG. 19 is a flowchart illustrating the processing flow executed by the air conditioning system when the air conditioning system is started. FIG. 19 is a flowchart illustrating an example of grouping determination processing. FIG. 19 is a flowchart illustrating the processing flow related to displaying the equipment configuration and releasing an interlock. FIG. 19 is a diagram illustrating information displayed on the screen of the remote controller. FIG. 19 is a diagram illustrating information displayed on the screen of the remote controller. FIG. 19 is a diagram illustrating an example of the configuration of an air conditioning system related to large space setting. FIG. 10 is a diagram showing an example of the configuration of an air conditioning system according to a modified example.

[0009] Hereinafter, the present embodiment will be described in detail with reference to the drawings, in which the same or corresponding parts are designated by the same reference numerals and description thereof will not be repeated.

[0010] Fig. 1 is a diagram showing an example of the configuration of an air conditioning system 100 according to an embodiment. The air conditioning system 100 shown in Fig. 1 includes an outdoor unit 10, an indoor unit 20, a shutoff unit 30, an alarm unit 40, and remote controllers 50 and 60. Here, an example will be described in which the air conditioning system 100 is applied to rooms A and B, which are examples of air-conditioned spaces, and a manager's room.

[0011] 1 includes a plurality of indoor units 20, shutoff units 30, alarm units 40, and remote controllers 50. In the following description, in order to distinguish between these multiple components, the indoor units 20, shutoff units 30, alarm units 40, and remote controllers 50 may be referred to as indoor units 20a, 20b..., shutoff units 30a, 30b..., alarm units 40a, 40b..., and remote controllers 50a, 50b..., respectively.

[0012] An indoor unit 20, an alarm unit 40, and a remote controller 50 are disposed in each of rooms A and B. The indoor unit 20 is equipped with a refrigerant sensor 23 that detects refrigerant leaks. The alarm unit 40 has the function of detecting refrigerant leaks and the function of sounding an alarm in response to a refrigerant leak. The alarm unit 40 is disposed in a location where it is considered easy to detect refrigerant leaking from the indoor unit 20. The alarm unit 40 may be disposed, for example, on the floor, wall, or ceiling. Multiple alarm units 40 may be disposed in one room. By detecting refrigerant leaks with the alarm unit 40 in addition to the refrigerant sensor 23 possessed by the indoor unit 20, refrigerant leaks in the indoor unit 20 can be more reliably detected.

[0013] The remote controller 50 is attached to, for example, a wall of a room. The remote controller 50 has a function of transmitting setting information such as the air conditioning temperature to the indoor unit 20, as well as a function of sounding an alarm in case of a refrigerant leak. The remote controller 50 is an example of an alarm device.

[0014] A remote controller 60 is placed in the manager's room. For example, a manager who manages the air-conditioned space is stationed in the manager's room. The manager's room may be a night security room or the like. The remote controller 60 is an example of a management alarm device. If a refrigerant leak occurs in either room A or B, the remote controller 60 issues an alarm about the refrigerant leak. The manager takes appropriate measures in response to the alarm issued by the remote controller 60.

[0015] The outdoor unit 10, the indoor unit 20, and the shutoff unit 30 are connected by piping 120 through which a refrigerant flows. The piping 120 includes a pair of piping 121 that connects the indoor unit 20a and the shutoff unit 30a, and a pair of piping 122 that connects the indoor unit 20b and the shutoff unit 30b.

[0016] A refrigerant circulates between the outdoor unit 10 and the indoor unit 20a via piping 120 passing through the shutoff unit 30a. A refrigerant circulates between the outdoor unit 10 and the indoor unit 20b via piping 120 passing through the shutoff unit 30b. The outdoor unit 10, the indoor unit 20a, the shutoff unit 30a, and the piping 120 form a refrigerant circulation flow path through which the refrigerant circulates. Similarly, the outdoor unit 10, the indoor unit 20b, the shutoff unit 30b, and the piping 120 form a refrigerant circulation flow path through which the refrigerant circulates. Here, the outdoor unit 10 is an example of a heat source unit.

[0017] The indoor units 20a and 20b exchange heat with the outdoor unit 10 via the refrigerant circulating through the refrigerant circulation flow path, thereby air-conditioning the rooms A and B, respectively. If a refrigerant leak occurs in room A, the shutoff unit 30a has the function of shutting off the flow of refrigerant to the indoor unit 20a by closing the pipe 121. Similarly, if a refrigerant leak occurs in room B, the shutoff unit 30b has the function of shutting off the flow of refrigerant to the indoor unit 20b by closing the pipe 122.

[0018] Hereinafter, the indoor unit connected to the shutoff unit 30a by piping 121 may be referred to as the indoor unit subordinate to the shutoff unit 30a, and the indoor unit connected to the shutoff unit 30b by piping 122 may be referred to as the indoor unit subordinate to the shutoff unit 30b. In this case, the indoor unit 20a is the indoor unit subordinate to the shutoff unit 30a, and the indoor unit 20b is the indoor unit subordinate to the shutoff unit 30b.

[0019] The outdoor unit 10, the indoor units 20a, 20b, the shutoff units 30a, and the shutoff units 30b communicate with each other via a communication path L1. The communication path L1 is an example of a communication path for establishing communication between the outdoor unit 10, the indoor units 20a, 20b, the shutoff units 30a, and the shutoff units 30b.

[0020] The cutoff unit 30a and the alarm unit 40a communicate with each other via a communication path L2. Similarly, the cutoff unit 30b and the alarm unit 40b communicate with each other via a communication path L2. The communication path L2 is an example of a communication path for establishing communication between the cutoff unit 30 and the alarm unit 40.

[0021] The indoor unit 20a and the remote controller 50a communicate via communication path L3. Similarly, the indoor unit 20b and the remote controller 50b communicate via communication path L3. Communication path L3 is an example of a communication path for establishing communication between the indoor unit 20 and the remote controller 50. In particular, in the first embodiment, the indoor unit 20b and the remote controller 60 located in the manager's room communicate via communication path L3.

[0022] The indoor unit 20a and the alarm unit 40a notify the shutoff unit 30a of the refrigerant leak. Based on the notification of the refrigerant leak, the shutoff unit 30a closes the piping 121. Similarly, the indoor unit 20b and the alarm unit 40b notify the shutoff unit 30b of the refrigerant leak. Based on the notification of the refrigerant leak, the shutoff unit 30b closes the piping 122.

[0023] If a refrigerant leak is detected in the indoor unit 20a or the alarm unit 40a, the alarm unit 40a and the remote controller 50a issue an alarm. Similarly, if a refrigerant leak is detected in the indoor unit 20b or the alarm unit 40b, the alarm unit 40b and the remote controller 50b issue an alarm. The remote controller 60 located in the manager's room issues an alarm when a refrigerant leak is detected in the indoor unit 20a or the alarm unit 40a, and when a refrigerant leak is detected in the indoor unit 20b or the alarm unit 40b.

[0024] 1, a configuration for detecting a refrigerant leak and a configuration for reporting a refrigerant leak are redundantly arranged in each of rooms A and B. Therefore, with air conditioning system 100, safety measures against refrigerant leaks can be strengthened compared to systems that do not employ such redundant configurations.

[0025] Furthermore, in the air conditioning system 100, the communication paths (communication paths L1, L2) used to notify the shutoff unit 30 of a refrigerant leak are different between the indoor unit 20 and the alarm unit 40. Therefore, even if a communication failure occurs on one of the two communication paths (L1, L2), the refrigerant leak can be reliably notified to the shutoff unit 30 via the other communication path.

[0026] Furthermore, in the air conditioning system 100, the communication path L2 for reporting a refrigerant leak via the alarm unit 40 is different from the communication path L3 for reporting a refrigerant leak via the remote controllers 50 and 60. Therefore, even if a communication failure occurs on one of the two communication paths (L2, L3), the refrigerant leak alarm can be reliably issued on the other communication path.

[0027] Furthermore, in the air conditioning system 100, the blocking units 30a and 30b separate the areas where the refrigerant flow is stopped. Therefore, for example, even if a refrigerant leak is detected in room A and operation of the indoor unit 20a in room A is stopped, operation of the indoor unit 20b in room B can continue.

[0028] Here, an example of the configuration of the air conditioning system 100 has been described. The configuration shown in Fig. 1 includes a device configuration for preparing for a refrigerant leak. Hereinafter, the device configuration for preparing for a refrigerant leak may be referred to as a "safety device."

[0029] As will be explained later, the air conditioning system 100 can be constructed in various configurations. The air conditioning system 100 may be constructed using one of a number of basic patterns, or may be constructed by combining two or more basic patterns. These basic patterns include patterns that include a safety device and patterns that do not include a safety device. Next, an example of these basic patterns will be described.

[0030] Fig. 2 is a diagram for explaining basic patterns constituting the air conditioning system 100. Basic patterns 1 to 3 are shown in Fig. 2.

[0031] Basic pattern 1 includes an outdoor unit 10, an indoor unit 20, a shutoff unit 30, and a remote controller 50. Basic pattern 1 does not include an alarm unit 40. In basic pattern 1, the shutoff unit 30, the refrigerant sensor 23, and the remote controller 50 function as safety devices.

[0032] Basic pattern 2 includes an alarm unit 40 in addition to the equipment configuration of basic pattern 1. In basic pattern 2, the shutoff unit 30, refrigerant sensor 23, remote controller 50, and alarm unit 40 function as safety devices. In basic pattern 2, the refrigerant sensor 23 may be designed not to function. This is because a refrigerant leak would be detected by the alarm unit 40. In this case, the sensor function of the refrigerant sensor 23 may be set to off, or the refrigerant sensor 23 itself may be removed from the indoor unit 20.

[0033] Basic pattern 3 includes the outdoor unit 10, the indoor unit 20, and the remote controller 50. Basic pattern 3 does not include the shutoff unit 30 or the alarm unit 40. In basic pattern 3, the refrigerant sensor 23 is not connected to the indoor unit 20. Therefore, basic pattern 3 does not include a safety device. Basic pattern 3 may be applied to rooms with a large indoor space. In a room with a large indoor space, even if a refrigerant leak occurs in the indoor unit 20, the leaked refrigerant will diffuse throughout the large space of the room, making it unlikely that the refrigerant leak will immediately have a negative impact on the air-conditioning environment.

[0034] The designer designs the air conditioning system 100 by combining various basic patterns 1 to 3. The contractor installs the system based on the design and confirms that the installed system is configured as designed before conducting a trial run of the system.

[0035] 3 is a diagram for explaining the positional relationship between the indoor unit 20, the shutoff unit 30, the alarm unit 40, and the remote controller 50. Here, the positional relationship between the indoor unit 20 (20a) and the like will be explained using room A shown in FIG. 1 as a representative example.

[0036] The indoor unit 20a is embedded in the ceiling of room A, which is the space to be air-conditioned. The shutoff unit 30a is placed in the attic of room A. The alarm unit 40a is placed on the floor of room A, for example. The alarm unit 40a is equipped with an LED (Light Emitting Diode) 45 for displaying an alarm. The alarm unit 40a is communicatively connected to the shutoff unit 30a via a communication path L2. Power is supplied from the shutoff unit 30a to the alarm unit 40a. The alarm unit 40a and the shutoff unit 30a may be configured to be wirelessly connected. The shutoff unit 30 is an example of a shutoff device, the alarm unit 40 is an example of an alarm sensor device, and the remote controllers 50 and 60 are examples of alarm devices.

[0037] The remote controller 50a is placed on the wall of the room A for user convenience. The remote controller 50a is communicatively connected to the cutoff unit 30a via a communication path L3. The remote controller 50a includes a display 51 and an operation unit 52. The user operates the operation unit 52 to input setting information, including the room temperature setting, into the remote controller 50a. The display 51 displays the room temperature and various other information.

[0038] The shutoff unit 30a and the indoor unit 20a are connected by a pair of pipes 121 through which the refrigerant flows. The refrigerant sensor 23 is disposed near the pipes 121 that pass through the indoor unit 20a. If the refrigerant sensor 23 detects a refrigerant leak, the refrigerant leak is notified to the remote controller 50a via the communication path L3. Based on the notification of the refrigerant leak, the remote controller 50a emits an alarm sound and displays alarm information on the display 51. The remote controller 50a may be equipped with an LED for displaying the alarm. When displaying alarm information on the display 51, the remote controller 50a may turn on the backlight of the display 51.

[0039] Here, the layout relationship of the indoor unit 20 (20a) and the like has been explained using room A as a representative example. In room B, an indoor unit 20b, a shutoff unit 30b, an alarm unit 40b, and a remote controller 50b are arranged in the same manner as in room A.

[0040] 4 is a diagram showing an outline of the configuration of the shutoff unit 30. Here, an outline of the configuration of the shutoff unit 30 (30a) will be described using room A as a representative example. The shutoff unit 30a includes a shutoff valve 34 that shuts off a pair of pipes 121, and a substrate 300 that opens and closes the shutoff valve 34.

[0041] The pair of pipes 121 includes a pipe 121a through which refrigerant flows from the outdoor unit 10 to the indoor unit 20a, and a pipe 121b through which refrigerant flows from the indoor unit 20a to the outdoor unit 10. Liquid refrigerant flows through one of the pipes 121a, 121b, and gas refrigerant flows through the other. When the outdoor unit 10 functions as a condenser and the indoor unit 20a functions as an evaporator, room A is cooled. When the outdoor unit 10 functions as an evaporator and the indoor unit 20a functions as a condenser, room A is heated.

[0042] The shutoff valves 34 include a shutoff valve 34a attached to the pipe 121a and a shutoff valve 34b attached to the pipe 121b. The shutoff valves 34 are, for example, linear expansion valves.

[0043] The circuit board 300 communicates with the outdoor unit 10 and the indoor unit 20a via communication path L1, and with the alarm unit 40a via communication path L2. The circuit board 300 is provided with multiple terminals 370 for connecting multiple alarm units 40. The circuit board 300 closes the shutoff valves 34a and 34b when a refrigerant leak is notified from the indoor unit 20a and when a refrigerant leak is notified from the alarm unit 40a. This closes the pipes 121a and 121b. As shown by the dashed lines, multiple indoor units 20 may be connected in parallel to the pipe 121.

[0044] Fig. 5 is a block diagram showing the configurations of the outdoor unit 10, indoor unit 20, shutoff unit 30, and alarm unit 40. Fig. 5 shows the outdoor unit 10, indoor units 20a and 20b, shutoff units 30a and 30b, and alarm units 40a and 40b. The indoor units 20a and 20b have a common configuration, the shutoff units 30a and 30b have a common configuration, and the alarm units 40a and 40b have a common configuration. Fig. 5 shows the details of the configurations of the indoor unit 20a, shutoff unit 30a, and alarm unit 40a, while omitting the details of the configurations of the indoor unit 20b, shutoff unit 30b, and alarm unit 40b.

[0045] The outdoor unit 10 includes an air conditioning mechanism 14. The air conditioning mechanism 14 includes a compressor 141, a heat exchanger 142, a fan 144, and a four-way valve 145. A control device 15 is disposed in the outdoor unit 10. The control device 15 controls the air conditioning mechanism 14 and communicates with devices in the air conditioning system 100, including the indoor unit 20 and the shut-off unit 30. The control device 15 includes a processor 11, a memory 12, and a communication circuit 13.

[0046] The processor 11 is typically configured with a CPU (Central Processing Unit) or an MPU (Multi-Processing Unit). The control device 15 is also an example of a processing circuitry. The processor 11 is an example of an arithmetic device. The processor 11 controls various devices according to a program. This control is not limited to software processing, and can also be processed by dedicated hardware (electronic circuitry).

[0047] The memory 12 includes an area in which programs executed by the processor 11 are stored, an area in which the processor 11 temporarily stores program code and work memory, and an area in which an ID for identifying the outdoor unit 10 by other devices such as the shutoff unit 30 is stored. The memory 12 includes volatile memory such as dynamic random access memory (DRAM) and static random access memory (SRAM), read-only memory (ROM), and non-volatile memory such as flash memory. The memory 12 may be a solid state drive (SSD) or a hard disk drive (HDD). The memory 12 stores an ID (address) for identifying the outdoor unit 10 by devices communicating with the outdoor unit 10.

[0048] The processor 11 has a communication function. The processor 11 transmits data including an ID to the communication destination, thereby allowing the communication destination to identify the communication source. The processor 11 communicates with the cutoff units 30 (30a, 30b) via the communication circuit 13. The processor 11 also communicates with the indoor units 20 (20a, 20b) via the communication circuit 13 and the cutoff unit 30. The processor 11 also communicates with the remote controller 60 located in the manager's room via the communication circuit 13, the cutoff units 30a, 30b, and the indoor unit 20b.

[0049] The indoor units 20 (20a, 20b) include a processor 21, a memory 22, a refrigerant sensor 23, a sensor terminal 23a, an air conditioning mechanism 24, a sensor setting switch 25, a communication circuit 26, and a communication interface (I / F) 27. The air conditioning mechanism 24 includes a heat exchanger 242, an expansion valve 243, and a fan 244. The heat exchanger 242 is an example of a heat exchanger that exchanges heat with a heat source unit. The air conditioning mechanism 14 of the outdoor unit 10, the air conditioning mechanism 24 of the indoor unit 20, and the piping 120 (see FIG. 1) form a refrigerant circulation path and a refrigerant circuit through which the refrigerant circulates.

[0050] The memory 22 includes an area storing an ID (address) for the outdoor unit 10, the shutoff unit 30, etc. to identify the indoor unit 20. The detailed configurations of the processor 21 and the memory 22 are similar to those of the processor 11 and the memory 12 already described, and therefore the description thereof will not be repeated here.

[0051] The refrigerant sensor 23 is connected to the sensor terminal 23a. The refrigerant sensor 23 detects refrigerant leaks in the indoor unit 20. The sensor setting switch 25 is a switch for switching the sensor function of the refrigerant sensor 23 between on and off. The sensor setting switch 25 is operated, for example, by a worker performing maintenance on the indoor unit 20. Note that the worker may disable the refrigerant sensor 23 by removing the refrigerant sensor 23 from the sensor terminal 23a.

[0052] When the sensor function of the refrigerant sensor 23 is set to on by the sensor setting switch 25 , the processor 21 acquires sensor information from the refrigerant sensor 23 .

[0053] The processor 21 has a communication function. The processor 21 allows the communication destination to identify the source of the communication by transmitting data including the ID stored in the memory 22 to the communication destination. The processor 21 communicates with the blocking unit 30 via the communication circuit 26. The processor 21 communicates with the remote controller 50 via the communication interface 27.

[0054] The shutoff unit 30 (30a, 30b) includes a processor 31, a memory 32, a shutoff valve 34 (34a, 34b), a standby power supply 35, a communication circuit 33, a b-contact relay 36, and a communication interface (I / F) 37. The communication interface 37 includes a plurality of terminals 370 shown in FIG.

[0055] The b-contact relay 36 is disposed on the communication path L1 connecting the communication circuit 13 of the outdoor unit 10 and the communication circuit 26 of the indoor unit 20. The b-contact relay 36 is composed of, for example, a drive coil and a contact.

[0056] The communication circuit 33 of the interrupting unit 30 controls the state of the contact b relay 36 between an open state and a closed state based on a command from the outdoor unit 10. The contact b relay 36 functions as a switch that turns off when current is flowing through the drive coil to interrupt the communication path L1 and turns on when current is not flowing through the drive coil to maintain conduction of the communication path L1. Therefore, when power supply to the interrupting unit 30 is stopped, the conduction state of the communication path L1 is maintained. This makes it possible to prevent the communication circuit from being interrupted during a power outage, compared to when a contact a relay is used as the relay. Note that instead of the contact b relay 36, other switching elements such as a transistor and a filter may be used to switch the communication path L1 between an open state and a closed state.

[0057] The memory 32 includes an area for storing an ID that allows other devices such as the outdoor unit 10 to identify the shutoff unit 30. The detailed configurations of the processor 31 and the memory 32 are similar to those of the processor 11 and the memory 12 already described, and therefore the description thereof will not be repeated here.

[0058] The processor 31 has a communication function. The processor 31 transmits data including the ID stored in the memory 32 to the communication destination, thereby allowing the communication destination to identify the communication source. The processor 31 communicates with the outdoor unit 10 via the communication circuit 33. The processor 31 communicates with the indoor unit 20 via the communication circuit 33. The processor 31 communicates with the alarm unit 40 via the communication interface 37.

[0059] The processor 31 closes the shutoff valves 34a and 34b when a refrigerant leak is notified from the indoor unit 20 and when a refrigerant leak is notified from the alarm unit 40. This closes the pipes 121a and 121b. In the event of a power outage, the shutoff unit 30 switches the power supply source from the main power source to the standby power source 35. The standby power source 35 is configured, for example, by a secondary battery. In the event of a power outage, the processor 31 operates using power supplied from the standby power source 35 and closes the shutoff valves 34a and 34b. This stops the supply of refrigerant to the indoor unit 20 during the power outage.

[0060] The alarm unit 40 includes a processor 41 , a memory 42 , a refrigerant sensor 43 , a speaker 44 , an LED 45 , and a communication interface (I / F) 47 .

[0061] The memory 42 includes an area for storing an ID that allows other devices, such as the cutoff unit 30, to identify the alarm unit 40. The detailed configurations of the processor 41 and the memory 42 are similar to those of the processor 11 and the memory 12 already described, and therefore the description thereof will not be repeated here.

[0062] The refrigerant sensor 43 detects a refrigerant leak. The refrigerant sensor 43 is an example of an indoor refrigerant sensor. The processor 41 acquires sensor information from the refrigerant sensor 43. When a refrigerant leak is detected, the processor 41 generates an alarm sound from the speaker 44 and turns on the LED 45.

[0063] The processor 41 has a communication function. The processor 41 allows the communication destination to identify the source of the communication by transmitting data including the ID stored in the memory 42 to the communication destination. The processor 41 communicates with the blocking unit 30 via the communication interface 47.

[0064] 6 is a sequence diagram showing the processing flow when a refrigerant leak is detected by the refrigerant sensor 23 of the indoor unit 20a. In the sequence diagram, the alarm unit 40b and remote controller 50b arranged in room B are omitted from the illustration. The processing flow will be explained below with reference to FIG.

[0065] The refrigerant sensor 23 detects a refrigerant leak in the indoor unit 20a (step S1). In this case, the indoor unit 20a notifies the remote controller 50a of the refrigerant leak (step S2), notifies the shutoff unit 30a of the refrigerant leak (step S4), and notifies the outdoor unit 10 of the refrigerant leak (step S8). The indoor unit 20a then saves the refrigerant leak history in the memory 22 (see FIG. 5) (step S13) and stops air conditioning operation (step S14). The order in which steps S2, S4, S8, S13, and S14 are performed may be changed.

[0066] The remote controller 50a issues an alarm based on the notification from the indoor unit 20a (step S3). More specifically, the remote controller 50a issues an alarm sound and displays alarm information based on the notification of the refrigerant leak. This allows the user in room A to become aware of the refrigerant leak. The remote controller 50a then saves the refrigerant leak history (step S18).

[0067] The shutoff unit 30a closes the shutoff valves 34a and 34b based on the notification from the indoor unit 20a (step S5). By closing the shutoff valves 34a and 34b, the shutoff unit 30a closes the pipes 121a and 121b, thereby preventing the refrigerant leak from spreading. The shutoff unit 30a then notifies the alarm unit 40a of the refrigerant leak (step S6). The shutoff unit 30a then stores the refrigerant leak history in the memory 32 (see FIG. 5) (step S15).

[0068] The order in which steps S5, S6, and S15 are executed may be changed. As shown in Fig. 6, the blocking unit 30a may notify the outdoor unit 10 of the refrigerant leakage (step S8a).

[0069] The alarm unit 40a issues an alarm based on the notification from the shutoff unit 30a (step S7). More specifically, the alarm unit 40a issues an alarm sound and turns on the LED 45 (see FIG. 5) based on the notification of the refrigerant leak. This allows the user in room A to become aware of the refrigerant leak.

[0070] Based on the notification from the indoor unit 20a, the outdoor unit 10 notifies the remote controller 60 located in the manager's room of the refrigerant leak (step S9). Based on the notification from the indoor unit 20a, the outdoor unit 10 further notifies the shutoff unit 30b and the indoor unit 20b located in room B of the refrigerant leak in room A. More specifically, the outdoor unit 10 notifies the shutoff unit 30b and the indoor unit 20b of a "maintenance abnormality" message (steps S11 and S12). The order in which steps S9, S11, and S12 are performed may be changed. Thereafter, the outdoor unit 10 saves the refrigerant leak history in memory 12 (see FIG. 4) (step S19).

[0071] The remote controller 60 issues an alarm based on the notification from the outdoor unit 10 (step S10). More specifically, the remote controller 60 issues an alarm sound and displays alarm information based on the notification of a refrigerant leak. This allows the caretaker to become aware of the refrigerant leak. The remote controller 60 then saves the refrigerant leak history (step S20).

[0072] The shutoff unit 30b arranged in room B stores the refrigerant leak history information in memory 32 (see FIG. 5) based on the notification from the outdoor unit 10 (step S16). The indoor unit 20b arranged in room B stores the refrigerant leak history information in memory 22 (see FIG. 5) based on the notification from the outdoor unit 10 (step S17).

[0073] It is desirable that the outdoor unit 10 transmits the ID of the indoor unit 20a in which a refrigerant leak has been detected in each of steps S9, S11, and S12. This allows the remote controller 60, the shutoff unit 30b, and the indoor unit 20b to identify the indoor unit 20 in which a refrigerant leak has occurred. In this case, the remote controller 60 may issue an alarm including the ID of the indoor unit 20 in which a refrigerant leak has occurred. In addition, the shutoff unit 30b and the indoor unit 20b may each save a history including the ID of the indoor unit 20 in which a refrigerant leak has occurred.

[0074] Here, the processing flow when a refrigerant leak is detected by the refrigerant sensor 23 of the indoor unit 20a has been described. The processing flow when a refrigerant leak is detected by the refrigerant sensor 23 of the indoor unit 20b overlaps with the above description, except that the reference numerals of the components are different. Therefore, the description will not be repeated here.

[0075] 7 is a sequence diagram showing the processing flow when a refrigerant leak is detected by the refrigerant sensor 43 of the alarm unit 40a. In the sequence diagram, the alarm unit 40b and remote controller 50b arranged in room B are omitted from the illustration. The processing flow will be described below with reference to FIG.

[0076] The refrigerant sensor 43 detects a refrigerant leak in room A (step S31). In this case, the alarm unit 40a issues an alarm (step S32). More specifically, the alarm unit 40a issues an alarm sound and turns on the LED 45 (see FIG. 5) based on the notification of the refrigerant leak. This allows a user in room A to become aware of the refrigerant leak. The alarm unit 40a further notifies the shutoff unit 30a of the refrigerant leak (step S33). The order in which steps S31 and S32 are performed may be changed.

[0077] The shutoff unit 30a closes the shutoff valves 34a and 34b based on the notification from the alarm unit 40a (step S34). By closing the shutoff valves 34a and 34b, the shutoff unit 30a closes the pipes 121a and 121b, thereby preventing the refrigerant leak from spreading. The shutoff unit 30a further notifies the indoor unit 20a and the outdoor unit 10 of the refrigerant leak (steps S35 and S38). The shutoff unit 30a then stores the refrigerant leak history in the memory 32 (see FIG. 5) (step S45). The order in which steps S33, S34, S38, and S45 are performed may be changed.

[0078] Based on the notification from the shutoff unit 30a, the indoor unit 20a notifies the remote controller 50a of the refrigerant leak (step S36). Thereafter, the indoor unit 20a stores the refrigerant leak history in the memory 22 (see FIG. 5) (step S43) and stops the air conditioning operation (step S44). The order in which steps S36, S43, and S44 are performed may be changed.

[0079] The remote controller 50a issues an alarm based on the notification from the indoor unit 20a (step S37). More specifically, the remote controller 50a issues an alarm sound and displays alarm information based on the notification of the refrigerant leak. This allows the user in room A to become aware of the refrigerant leak. The remote controller 50a then saves the refrigerant leak history (step S48).

[0080] Based on the notification from the shutoff unit 30a, the outdoor unit 10 notifies the remote controller 60 located in the caretaker's room of the refrigerant leak (step S39). Based on the notification from the shutoff unit 30a, the outdoor unit 10 further notifies the shutoff unit 30b and the indoor unit 20b located in room B of the refrigerant leak in room A. More specifically, the outdoor unit 10 notifies the shutoff unit 30b and the indoor unit 20b of the refrigerant leak (steps S41 and S42) with a message stating "maintenance abnormality." The order in which steps S39, S41, and S42 are performed may be changed. Thereafter, the outdoor unit 10 saves the refrigerant leak history in memory 12 (see FIG. 4) (step S49).

[0081] The remote controller 60 issues an alarm based on the notification from the outdoor unit 10 (step S40). More specifically, the remote controller 60 issues an alarm sound and displays alarm information based on the notification of a refrigerant leak. This allows the caretaker to become aware of the refrigerant leak. The remote controller 60 then saves the refrigerant leak history (step S50).

[0082] The shutoff unit 30b arranged in room B stores the refrigerant leak history information in memory 32 (see FIG. 5) based on the notification from the outdoor unit 10 (step S46). The indoor unit 20b arranged in room B stores the refrigerant leak history information in memory 22 (see FIG. 5) based on the notification from the outdoor unit 10 (step S47).

[0083] It is desirable that the outdoor unit 10 transmits the ID of the indoor unit 20a in which a refrigerant leak has been detected in each of steps S39, S41, and S42. The reason for this has already been made clear when explaining steps S9, S11, and S12 in Fig. 6, so the explanation will not be repeated here.

[0084] Here, the processing flow when a refrigerant leak is detected by the refrigerant sensor 43 of the alarm unit 40a has been described. The processing flow when a refrigerant leak is detected by the refrigerant sensor 43 of the alarm unit 40b (see FIG. 1) overlaps with the above description, except that the reference numerals of the components are different. Therefore, the description will not be repeated here.

[0085] 8 is a flowchart for explaining the process by which the shutoff unit 30 closes the shutoff valves 34 (34a, 34b) in the event of a power outage. The process executed by the shutoff unit 30 will be explained below based on the flowchart.

[0086] When a power outage occurs (step S101), the shutoff unit 30 detects the power outage (step S102). Next, the shutoff unit 30 starts supplying power from the backup power supply 35 before the power supplied from the main power supply drops below a threshold (step S103). Next, the shutoff unit 30 closes the shutoff valve 34 using the power supplied from the backup power supply 35 (step S104).

[0087] In this way, when a power outage occurs, the shutoff unit 30 starts supplying power from the standby power supply 35 and closes the shutoff valve 34 before the power supplied from the main power supply falls below the threshold (step S104). Therefore, the air conditioning system 100 can prevent refrigerant leakage in the event of a power outage.

[0088] 9 is a flowchart for explaining the process by which the indoor unit 20 disables and enables the function of the refrigerant sensor 23 in response to operation of the sensor setting switch 25. The process executed by the indoor unit 20 will be explained below based on the flowchart.

[0089] First, the indoor unit 20 determines whether or not an operation to turn off the sensor function of the refrigerant sensor 23 has been detected (step S201). If an operation to turn off the sensor function of the refrigerant sensor 23 has been detected, the indoor unit 20 disables the sensor function of the refrigerant sensor 23 (step S202).

[0090] If the indoor unit 20 does not detect an operation to turn off the sensor function of the refrigerant sensor 23, it determines whether or not it has detected an operation to turn on the sensor function of the refrigerant sensor 23 (step S203). If the indoor unit 20 detects an operation to turn on the sensor function of the refrigerant sensor 23, it enables the sensor function of the refrigerant sensor 23 (step S204). If the indoor unit 20 does not detect an operation to turn on the sensor function of the refrigerant sensor 23, it ends the processing based on this flowchart.

[0091] By executing the processing described above, the refrigerant sensor 23 of the indoor unit 20 is enabled or disabled. If sufficient safety measures against refrigerant leaks have been implemented depending on the air-conditioning environment of the room, the designer may turn off the function of the refrigerant sensor 23 of the indoor unit 20. For example, if multiple alarm units 40 are installed in a room, or if a ventilation device with high ventilation capacity is installed in the room, the function of the refrigerant sensor 23 may be turned off in each case.

[0092] Here, an example has been described in which the blocking unit 30 is disposed as a separate device from the indoor unit 20. However, the blocking unit 30 may be built into the indoor unit 20. For example, in FIG. 1 , the blocking unit 30a may be built into the indoor unit 20a, and the blocking unit 30b may be built into the indoor unit 20b. This modification discloses a configuration in which the blocking unit 30 is built into the indoor unit 20 in the air conditioning system 100 that includes the indoor unit 20 and the blocking unit 30.

[0093] Fig. 10 is a diagram showing another example of the configuration of the air conditioning system 100. Fig. 10 shows an example in which a plurality of indoor units 20 are connected in parallel under each of shutoff units 30a and 30b. Indoor units 20a, 20c, and 20d are provided under shutoff unit 30a. Indoor units 20b and 20e are provided under shutoff unit 30b.

[0094] The indoor units 20a, 20c, and 20d are connected in parallel to the pipe 121 connected to the shutoff unit 30a. Therefore, the refrigerant flows between the outdoor unit 10 and the indoor unit 20a through the pipe 121, the refrigerant flows between the outdoor unit 10 and the indoor unit 20c through the pipe 121, and the refrigerant flows between the outdoor unit 10 and the indoor unit 20d through the pipe 121.

[0095] The indoor units 20b and 20e are connected in parallel to the pipe 122 connected to the shutoff unit 30b. Therefore, the refrigerant flows between the outdoor unit 10 and the indoor unit 20b through the pipe 122, and the refrigerant flows between the outdoor unit 10 and the indoor unit 20e through the pipe 122.

[0096] The indoor units 20a and 20c are arranged in room A. The indoor unit 20b is arranged in room B. The indoor unit 20d is arranged in room C. The indoor unit 20e is arranged in room D. In room A, remote controllers 50a and 50c are provided corresponding to the indoor units 20a and 20c, respectively. In room B, a remote controller 50b corresponding to the indoor unit 20b is provided. In room C, a remote controller 50d corresponding to the indoor unit 20d is provided. In room D, a remote controller 50e corresponding to the indoor unit 20e is provided.

[0097] Rooms A to C employ the configuration of basic pattern 2 shown in Fig. 2. Room D employs the configuration of basic pattern 1 shown in Fig. 2. Alarm units 40a and 40c are placed in room A. Alarm unit 40b is placed in room B. Alarm unit 40d is placed in room C.

[0098] The indoor units 20a, 20c, and 20d and the alarm units 40a and 40c notify the shutoff unit 30a of a refrigerant leak. The indoor units 20b and 20e and the alarm unit 40b notify the shutoff unit 30b of a refrigerant leak. When the shutoff unit 30a is notified of a refrigerant leak, it closes the piping 121 with the shutoff valve 34 and stops the air conditioning operation of the indoor units 20a, 20c, and 20d. When the shutoff unit 30b is notified of a refrigerant leak, it closes the piping 122 with the shutoff valve 34 and stops the air conditioning operation of the indoor units 20b and 20e.

[0099] The interrupter unit 30a communicates with the alarm units 40a, 40c, and 40d via communication path L2, and the interrupter unit 30b communicates with the alarm unit 40b via communication path L2.

[0100] The indoor unit 20a communicates with the remote controller 50a via communication path L3. The indoor unit 20b communicates with the remote controller 50b via communication path L3. The indoor unit 20c communicates with the remote controller 50c via communication path L3. The indoor unit 20d communicates with the remote controller 50d via communication path L3. The indoor unit 20e communicates with the remote controller 50e via communication path L3.

[0101] The outdoor unit 10 and the shutoff units 30a and 30b communicate via a communication path L1. The outdoor unit 10 and the indoor units 20a to 20e communicate via a communication path L1. The shutoff unit 30a and the indoor units 20a, 20c, and 20d communicate via a communication path L1. The shutoff unit 30b and the indoor units 20b and 20e communicate via a communication path L1.

[0102] Fig. 11 is a diagram showing a communication path L1 of the air conditioning system 100 shown in Fig. 10. In Fig. 11, "OC" means an "outdoor unit", "IC" means an "indoor unit", and "SV" means an "shutoff unit".

[0103] 11, communication path L1 connects the communication circuit 13 of the outdoor unit 10, the communication circuits 33 of the shutoff units 30a and 30b, and the communication circuits 26 of the indoor units 20a to 20e. The communication circuit 13 of the outdoor unit 10 and the communication circuit 33 of the shutoff unit 30a are connected by wiring. The communication circuit 13 of the outdoor unit 10 and the communication circuit 33 of the shutoff unit 30b are connected by wiring.

[0104] The communication circuit 13 of the outdoor unit 10 and the communication circuit 26 of the indoor unit 20a are connected by wiring via the communication circuit 33 of the shutoff unit 30a and the b-contact relay 36 of the shutoff unit 30a. The communication circuit 13 of the outdoor unit 10 and the communication circuit 26 of the indoor unit 20b are connected by wiring via the communication circuit 33 of the shutoff unit 30b and the b-contact relay 36 of the shutoff unit 30b.

[0105] The communication circuit 26 of the indoor unit 20a, the communication circuit 26 of the indoor unit 20c, and the communication circuit 26 of the indoor unit 20d are connected in series by wiring. The communication circuit 26 of the indoor unit 20b and the communication circuit 26 of the indoor unit 20e are connected by wiring.

[0106] The communication circuit 33 of the circuit breaking unit 30a turns on / off the b-contact relay 36 of the circuit breaking unit 30a in response to a command from the outdoor unit 10. When the b-contact relay 36 of the circuit breaking unit 30a changes from on to off, communication between the indoor units 20a, 20c, 20d and the outdoor unit 10 is cut off.

[0107] The communication circuit 33 of the circuit breaker unit 30b turns on / off the b-contact relay 36 of the circuit breaker unit 30b in response to a command from the outdoor unit 10. When the b-contact relay 36 of the circuit breaker unit 30b changes from on to off, communication between the indoor units 20b, 20e and the outdoor unit 10 is cut off.

[0108] The outdoor unit 10 according to this embodiment controls the state of the contact b relay 36 provided in each circuit breaker unit 30 to identify the indoor unit 20 provided under each circuit breaker unit 30. The method of identification will be described in detail below.

[0109] FIG. 12 is a flowchart for explaining the flow of processing executed by the air conditioning system 100 when the air conditioning system 100 is started up. After receiving a start-up command from the contractor, the air conditioning system 100 according to this embodiment sets the interlock to ON. This puts the air conditioning system 100 in a state where air conditioning operation is prohibited. After the contractor confirms that the configuration of the air conditioning system 100 is as designed, the contractor inputs a command to release the interlock into the air conditioning system 100. The air conditioning system 100 starts air conditioning operation based on the command to release the interlock. Here, the contractor is an example of a user.

[0110] The following describes the flow of processing from the start of the air conditioning system 100 to the release of the interlock, with reference to a flowchart.

[0111] First, when the control device 15 receives a startup command from the contractor, it starts the air conditioning system 100 (step S301). In step S301, an interlock for prohibiting air conditioning operation of the air conditioning system 100 is set to ON. The interlock may be, for example, a data flag that prohibits air conditioning operation by the system. When the data flag is ON, the control device 15 does not perform air conditioning operation.

[0112] The instructions of the contractor are input to the control device 15 of the outdoor unit 10 via, for example, a remote controller 50. Note that instead of the remote controller 50, a maintenance controller carried by the contractor may be employed.

[0113] Next, the control device 15 executes a unit search process (step S302). In step S302, the control device 15 requests a response from devices connected to the system, targeting a certain range of IDs (addresses). The ID range is, for example, 0 to 255. In this embodiment, it is assumed that an ID is stored in each device, including the indoor unit 20, the shutoff unit 30, and the alarm unit 40. When each device receives a response including its own ID, it transmits a response including attribute information and capability information to the control device 15.

[0114] The attribute information is information indicating the attributes of devices such as shutoff units and indoor units. The capability information is information indicating the capabilities of the devices. The control device 15 executes a unit search process to identify the IDs of the indoor units 20 and shutoff units 30 connected to the system.

[0115] Next, the control device 15 executes an error determination process based on the information collected in the unit search process (step S303). More specifically, the control device 15 checks whether the number of connected devices and the capacity of the connected indoor units exceed the allowable capacity.

[0116] Next, the control device 15 identifies the system configuration (step S304). Step S304 includes a grouping determination process. In the grouping determination process, the control device 15 identifies the relationship between the shutoff units 30 and the indoor units 20 subordinate to them. In other words, the control device 15 identifies the "connection relationship between the shutoff units 30 and the indoor units 20."

[0117] The control device 15 turns on / off the b-contact relay 36 provided in each breaking unit 30 to identify the "connection relationship between the breaking unit 30 and the indoor unit 20." This control will be explained later using Fig. 13. Note that the control device 15 skips this process if the system does not include a breaking unit 30.

[0118] Furthermore, in step S304, the control device 15 acquires information relating to the breaking units 30 from each breaking unit 30, and acquires information relating to the indoor units 20 from each indoor unit 20.

[0119] The information related to the shutoff unit 30 includes information related to the alarm units 40 connected to the shutoff unit 30. The information related to the alarm units 40 connected to the shutoff unit 30 includes information such as the number of alarm units 40 and information related to whether the alarms of the alarm units 40 are enabled or disabled. The information related to the indoor unit 20 includes information related to whether the refrigerant sensor 23 is connected, information related to whether the function of the refrigerant sensor 23 is enabled or disabled, and information related to whether the alarm function of the remote controller 50 is enabled or disabled.

[0120] Furthermore, in step S304, the control device 15 determines the number and connection relationships of the shutoff units 30 and indoor units 20. If the system includes one or more ventilation devices, the control device 15 also determines the number of ventilation devices. At this stage, the control device 15 has not yet acquired information about the alarm unit 40. The control device 15 transmits information about the determined connection relationships to each indoor unit 20 and each shutoff unit 30.

[0121] Step S304 also includes processing by the indoor unit 20. The details of this processing will be described. First, the indoor unit 20 identifies the shutoff unit 30 that is in a connection relationship with the indoor unit 20 from among the multiple shutoff units 30, based on the information regarding the connection relationship received from the control device 15. For example, in the configuration example shown in FIG. 10 , the indoor unit 20a identifies that it is in a connection relationship with the shutoff unit 30a. Furthermore, the indoor unit 20b identifies that it is in a connection relationship with the shutoff unit 30b. Furthermore, the indoor unit 20 identifies the alarm unit 40 that is connected to communicate with the shutoff unit 30 that is in a connection relationship. For example, in the configuration example shown in FIG. 10 , the indoor unit 20a identifies the alarm units 40a and 40c that are connected to communicate with the shutoff unit 30a. Furthermore, the indoor unit 20b identifies the alarm unit 40b that is connected to communicate with the shutoff unit 30b. In this way, in this embodiment, some of the information regarding the system configuration is acquired by the indoor unit 20.

[0122] Next, the control device 15 executes a connection information setting process (step S305). More specifically, the control device 15 transmits information regarding the "connection relationship between the shutoff unit 30 and the indoor unit 20" to each shutoff unit 30 and each indoor unit 20 included in the system. At this time, the indoor unit 20 and the shutoff unit 30 confirm various setting information with the control device 15. For example, the shutoff unit 30 or the indoor unit 20 may determine whether to enable or disable the function of the sensor that detects refrigerant leaks by inquiring of the outdoor unit 10 about the model of the outdoor unit 10. For example, if the outdoor unit 10 is a model designed for use with a non-flammable refrigerant (such as R410a) rather than a mildly flammable refrigerant (such as R32), safety measures against refrigerant leaks are not necessary. In this case, the indoor unit 20 may disable the function of the refrigerant sensor 23. The indoor unit 20 receives information regarding the "connection relationship between the shutoff unit 30 and the indoor unit 20" from the control device 15, and also acquires information regarding the alarm unit 40 within the indoor unit 20 itself, thereby enabling the system's equipment configuration to be displayed on the remote control 50.

[0123] Next, the control device 15 executes an error determination regarding the grouping of the indoor units 20 and the shutoff units 30 (step S306). More specifically, the control device 15 determines that an error has occurred if the "connection relationship between the shutoff units 30 and the indoor units 20" differs from the expected relationship.

[0124] For example, the control device 15 determines that an error has occurred if the number of indoor units 20 connected to the shutoff unit 30 exceeds the upper limit, or if no indoor units 20 are connected to the shutoff unit 30. In this case, the control device 15 displays an error code on the remote controller 50 or the like, and urges the installer to restart the system. The control device 15 may transmit the error code to the indoor unit 20 in which the error has occurred. In this case, the indoor unit 20 may display the error code on the corresponding remote controller 50. If no error has occurred, the control device 15 stores information regarding the connection relationship between the shutoff unit 30 and the indoor units 20 in the memory 12 of the control device 15.

[0125] Next, the indoor unit 20 displays the system's equipment configuration on the remote controller 50 based on the information about the alarm unit 40 acquired in step S304 and the information received from the control device 15 in step S305 (step S307). For example, in the case of the indoor unit 20a, information about the equipment configuration is displayed on the remote controller 50a. The installer compares the equipment configuration displayed on the remote controller 50 with the equipment configuration written on the design drawings at hand, and confirms that the safety devices of the system have been installed according to the design drawings.

[0126] Before step S307, the control device 15 may check with the shutoff unit 30 the number of alarm units 40, the presence or absence of a shutoff valve 34, etc., and transmit the confirmation results to the indoor unit 20. Furthermore, before step S307, the indoor unit 20 may check the connection state of the refrigerant sensor 23 and the connection state of the remote controller 50, and transmit the confirmation results to the control device 15. In step S307, the indoor unit 20 may also display the confirmation results of the control device 15 and the indoor unit 20 on the remote controller 50.

[0127] Next, the control device 15 determines whether to release the interlock (step S308). More specifically, if the contractor approves the configuration displayed in step S307, the control device 15 releases the interlock and ends the processing based on this flowchart. This puts the air conditioning system 100 into a state in which air conditioning operation is permitted. The processing of steps S307 and S308 will be described in detail later using FIG. 14.

[0128] FIG. 13 is a flowchart illustrating an example of the grouping determination process. This process is included in step S304 of FIG. 12. First, the control device 15 sets an initial value to n (step S401). n is a variable for identifying each of the multiple shutdown units 30 to be determined. Here, n is updated in step S406, so that the shutdown unit 30 to be determined changes. For example, in the configuration shown in FIG. 11, the shutdown unit 30a is the shutdown unit corresponding to n=1, and the shutdown unit 30b is the shutdown unit corresponding to n=2.

[0129] Next, the control device 15 opens only the contact b relay 36 of the shutoff unit n and closes the contact b relays 36 of the other shutoff units (step S402). Next, the control device 15 sends a request to all indoor units 20 in the system (step S403). Next, the control device 15 identifies the indoor units 20 that do not respond to the sent request as indoor units subordinate to the shutoff unit n (step S404).

[0130] Consider the case where the contact b relay 36 of the shutoff unit 30a is opened and the contact b relay 36 of the shutoff unit 30b is closed in the configuration shown in FIG. 11 . In this case, the request sent from the control device 15 does not reach the indoor units 20a, 20c, and 20d subordinate to the shutoff unit 30a, but reaches the indoor units 20b and 20e subordinate to the shutoff unit 30b. In this case, the control device 15 can confirm responses from the indoor units 20b and 20e, but cannot confirm responses from the indoor units 20a, 20c, and 20d. In this case, the control device 15 determines that the indoor units 20a, 20c, and 20d are subordinate to the shutoff unit 30a. In other words, the control device 15 determines that the indoor units 20a, 20c, and 20d are connected to the shutoff unit 30a.

[0131] After step S404, the control device 15 determines whether or not the process of step S402 has been completed for all the breaking units 30 (step S405). If the process of step S402 has not been completed for all the breaking units 30, the control device 15 updates n (step S406). Thereafter, the control device 15 returns the process to step S402.

[0132] If the control device 15 has completed the processing of step S402 for all the shutoff units 30, it opens the contact b relays 36 of all the shutoff units 30 (step S407). Next, if there is an indoor unit 20 that has responded, the control device 15 identifies that indoor unit 20 as an indoor unit 20 that is not connected to any shutoff unit 30 (basic pattern 3) (step S408). Next, the control device 15 closes the contact b relays 36 of all the shutoff units 30 (step S409). Thereafter, the control device 15 stores the identification results from the processing of steps S404 and S408 in the memory 12 (step S410) and ends the processing based on this flowchart. At this time, information indicating the connection relationship between the shutoff unit 30 and the indoor unit 20 is stored in the memory 12 of the control device 15 for each shutoff unit 30.

[0133] Fig. 14 is a flowchart illustrating an example of a process related to displaying the device configuration and releasing the interlock. Fig. 15 and Fig. 16 are diagrams illustrating information displayed on the screen of the remote controller. The process shown in Fig. 14 corresponds to the process of steps S307 and S308 in Fig. 12.

[0134] The processing shown in Fig. 14 will be described below with reference to Fig. 15 or Fig. 16 as necessary. First, the indoor unit 20 displays a screen for selecting a basic pattern on the display 51 of the remote controller 50 (step S501). Fig. 15 shows an example of the screen for selecting a basic pattern. When the air conditioning system 100 is started up, the remote controller 50 displays a screen for selecting a basic pattern following the start-up screen. Three basic patterns are displayed on the screen together with the message "Please select a configuration."

[0135] "1. Use of indoor unit sensor" corresponds to basic pattern 1 in FIG. 2. "2. Use of alarm unit" corresponds to basic pattern 2 in FIG. 2. "3. Large space setting" corresponds to basic pattern 3 in FIG. 2.

[0136] The contractor selects a basic pattern that he or she wishes to check from among various basic patterns that may be included in the system by touching the display 51 of the remote controller 50. The indoor unit 20 accepts the contractor's operation to select a basic pattern (step S502).

[0137] Next, the indoor unit 20 displays the device configuration of the selected basic pattern on the remote controller 50 (step S503). At this time, the indoor unit 20 reflects the device configuration specified in step S304 of Fig. 12 on the screen of the remote controller 50. Fig. 15 shows examples of device configurations of the selected basic patterns for each basic pattern.

[0138] For example, if "1. Indoor unit sensor used" is selected, a configuration corresponding to basic pattern 1 is displayed for each indoor unit 20. Display items include information such as the ID (address) of the indoor unit 20, whether it is connected to the shutoff unit 30, whether the refrigerant sensor 23 is connected, whether an alarm is set on the remote controller 50 (enabled / disabled), whether the remote controller 60 is in the manager's room, and whether the mechanical ventilation device is on or off. This screen is an example of a first screen that displays information about the indoor unit 20. The first screen includes information indicating whether the refrigerant sensor 23 is installed. The contractor can check information about other indoor units 20 by switching the screen page.

[0139] Note that in Figure 15, information for one indoor unit 20 corresponding to "1. Use of indoor unit sensor" is shown as an example, but if the air conditioning system 100 includes multiple indoor units 20, the remote controller 50 will display information corresponding to each indoor unit 20.

[0140] When "2. Alarm unit used" is selected, a configuration corresponding to basic pattern 2 is displayed for each indoor unit 20. Display items include information such as the ID (address) of the indoor unit 20, whether it is connected to the shutoff unit 30, whether the refrigerant sensor 23 is connected, and whether an alarm has been set on the remote controller 50. The installer can check the ID (address) of the shutoff unit 30 and information regarding the number of alarm units 40 by switching between pages on the screen.

[0141] The 1 / 3 page screen corresponding to "2. Alarm unit used" is an example of a first screen that displays information about the indoor unit 20. The 2 / 3 page screen corresponding to "2. Alarm unit used" is an example of a second screen that displays information about the shutoff unit 30. The second screen includes information about the alarm unit 40. The information about the alarm unit 40 includes the number of alarm units 40. For example, from the 2 / 3 page screen, the installer can identify that three alarm units 40, alarm units 1 to 3, are installed in the system. The installer can further check information about the other indoor units 20 by switching the screen page.

[0142] Note that Figure 15 illustrates information for one indoor unit 20 and one shutoff unit 30 corresponding to "2. Alarm unit used", but if the air conditioning system 100 includes multiple indoor units 20 and multiple shutoff units 30, the remote controller 50 will display information corresponding to each indoor unit 20 and each shutoff unit 30.

[0143] When "3. Large Space Setting" is selected, a configuration corresponding to basic pattern 3 is displayed. In this case, the screen displays that the refrigerant sensor function will be disabled.

[0144] The contractor compares the equipment configuration displayed on the screen of the remote controller 50 with the equipment configuration described in the blueprint at hand, and confirms that the safety devices of the system have been installed according to the blueprint. If the system includes multiple basic patterns, the contractor repeats the operation of selecting a configuration and the task of confirming the selected configuration. In other words, the contractor checks the equipment configuration displayed on the screen of the remote controller 50 with the equipment configuration described in the blueprint at hand for each basic pattern. Then, the contractor touches the screen to operate the OK button or the NG button. The OK button operation corresponds to the contractor's approval operation. The NG button operation corresponds to the contractor's non-approval operation.

[0145] The indoor unit 20 detects operation of the OK button or NG button (step S504). The indoor unit 20 determines whether operation of the OK button has been detected (step S505). If the indoor unit 20 detects operation of the OK button, it transmits information requesting release of the interlock to the control device 15 and displays a startup screen (step S506). Next, the control device 15, which has received the information requesting release of the interlock, releases the interlock and automatically starts air conditioning operation (test run) of the air conditioning system 100 (step S507). Here, the information transmitted from the indoor unit 20 to the control device 15 based on operation of the OK button is an example of information indicating the user's approval of the configuration information.

[0146] When the indoor unit 20 detects the operation of the NG button, it displays a screen prompting the user to confirm the system configuration (step S508). The indoor unit 20 also transmits information to the control device 15 requesting that the interlock be maintained. In this case, the interlock state continues. Here, the information transmitted from the indoor unit 20 to the control device 15 based on the operation of the NG button is an example of information indicating the user's non-approval of the configuration information. Figure 16 shows an example of a startup screen displayed based on the operation of the OK button and an example of a screen displayed based on the operation of the NG button.

[0147] The configuration corresponding to the menu "1. Use indoor unit sensor" shown in Fig. 15 is a very basic configuration. Therefore, when the system detects this configuration, the screen of the remote controller 50 may be configured to automatically transition from the startup screen to the "Determine connected device" screen. In this case, the remote controller 50 displays the "1. Use indoor unit sensor" screen after the startup screen without displaying "Please select a configuration."

[0148] The remote controller 50 may automatically display the screen shown in Fig. 15 when new equipment such as an alarm unit 40 and a ventilation device is installed in the current system. However, if there are multiple remote controllers 50 in the system, it is sufficient to display the screen shown in Fig. 15 on the remote controller 50 related to the newly installed equipment, and it is not necessary to display that screen on all remote controllers 50. Furthermore, if the new equipment is not, for example, a "equipment for preparing for refrigerant leaks" such as a temperature sensor, the remote controller 50 does not need to display the screen shown in Fig. 15.

[0149] As described above, when the air conditioning system 100 is started up, it identifies the configuration related to the safety devices of the air conditioning system 100 and displays the identification result on the remote controller 50. This allows the contractor to easily confirm that the safety devices have been installed in the air conditioning system 100 as shown in the design drawings at hand. Therefore, according to this embodiment, it is possible to provide an air conditioning system that can reduce the workload of the contractor when confirming that the equipment to prepare for refrigerant leaks has been installed according to the design drawings.

[0150] In the present embodiment, the control device 15 is disposed in the outdoor unit 10. However, the control device 15 may be disposed in the indoor unit 20 or the shutoff unit 30. Alternatively, the control device 15 may be disposed in the air conditioning system 100 separately from the outdoor unit 10, the indoor unit 20, and the shutoff unit 30.

[0151] Fig. 17 is a diagram showing an example configuration of an air conditioning system 100 related to a large space setting. In the configuration shown in Fig. 17, it is assumed that the spatial size of room D is significantly larger than the spatial sizes of rooms A to C. Room D is, for example, a large hall. A configuration related to basic pattern 3 shown in Fig. 2 is adopted for room D.

[0152] Assuming that room D is a large room, even if a refrigerant leak occurs in indoor unit 20e, the leaked refrigerant will diffuse throughout the large space of room D, making it unlikely that the refrigerant leak will immediately have a negative impact on the air-conditioned environment. Therefore, no safety device is provided in room D.

[0153] (Modification 1) Fig. 18 is a diagram showing an example of the configuration of an air conditioning system 100 according to Modification 1. As shown in Fig. 18, the air conditioning system 100 may include a branch controller 90.

[0154] The flow shunt controller 90 is provided between the outdoor unit 10 and the shutoff units 30a, 30b. The flow shunt controller 90 is connected to the outdoor unit 10 by a pair of pipes 123. The flow shunt controller 90 includes a flow shunt mechanism 91 for shunting the refrigerant. The flow shunt mechanism 91 is composed of an expansion valve, a heat exchanger, a refrigerant branch path, etc. The flow shunt controller 90 is connected to the shutoff unit 30a by a pair of pipes 124. The flow shunt controller 90 is connected to the shutoff unit 30b by a pair of pipes 125. The flow shunt controller 90 is connected to the indoor unit 20e by a pair of pipes 126.

[0155] 18, indoor unit 20a under the control of shutoff unit 30a is placed in room A, indoor unit 20b under the control of shutoff unit 30b is placed in room B, and indoor units 20c and 20d under the control of shutoff unit 30b are placed in room C. Indoor unit 20e is placed in room D.

[0156] The shunt controller 90 controls the air conditioning mode of the indoor unit 20a subordinate to the shutoff unit 30a, the air conditioning mode of the indoor units 20b to 20d subordinate to the shutoff unit 30b, and the air conditioning mode of the indoor unit 20e by controlling the flow of refrigerant in the pipes 124 to 126. For example, the shunt controller 90 can operate the indoor unit 20a subordinate to the shutoff unit 30a in cooling mode, while operating the indoor unit 20e and the indoor units 20b to 20d subordinate to the shutoff unit 30b in heating mode.

[0157] Here, an example has been described in which the shutoff unit 30 is arranged as a separate device from the diversion controller 90. However, the shutoff unit 30 may be built into the diversion controller 90. For example, in FIG. 18 , the shutoff units 30a and 30b may be built into the diversion controller 90. This modification discloses a configuration in which the shutoff unit 30 is built into the diversion controller 90 in an air conditioning system 100 that includes an indoor unit 20, a shutoff unit 30, and a diversion controller 90. Note that the control device 15 may be arranged in the diversion controller 90.

[0158] (Variation 2) In the present embodiment, an example has been described in which the air conditioning system 100 is configured by combining basic patterns 1 to 3 related to safety devices. The air conditioning system 100 may accept an operation to change the type of basic pattern. For example, the air conditioning system 100 may accept an operation by a contractor or the like to change the configuration of basic pattern 2 to basic pattern 1 or basic pattern 3. For example, when the air conditioning system 100 accepts an operation to change basic pattern 2 to basic pattern 3, the air conditioning system 100 disables the function of the refrigerant sensor 23 and the function of the alarm unit 40. Furthermore, the air conditioning system 100 may have a function to determine the type of refrigerant (e.g., R32VRF, HVRF (R32, propane)) when the air conditioning system 100 is powered on and automatically change the setting range required for the interlock configuration. In this case, the air conditioning system 100 determines the type of refrigerant by referring to the settings of the outdoor unit 10.

[0159] (Variation 3) In the present embodiment, the contractor confirms whether the configuration of the air conditioning system 100 is in accordance with the design drawings. However, such confirmation processing may also be performed by the air conditioning system 100. In this case, the contractor inputs design drawing data into the air conditioning system 100. The air conditioning system 100 determines whether the system configuration is in accordance with the design drawings by comparing the system configuration it has specified with the design drawing data. The air conditioning system 100 then displays the determination result on the remote controller 50. The contractor determines whether to release the interlock based on the determination result. By configuring in this manner, it is possible to automate the processes from system startup to trial operation.

[0160] (Other Modifications) In the embodiment, an example has been described in which the indoor unit 20 and the remote controller 50 communicate via communication path L3. However, the indoor unit 20 and the remote controller 50 may be configured to communicate via communication path L1 instead of communication path L3. Similarly, the remote controller 60 located in the manager's room may be configured to communicate via communication path L1 instead of communication path L3.

[0161] The refrigerant sensor 23 connected to the indoor unit 20 may be provided inside the indoor unit 20 or outside the indoor unit 20 .

[0162] In the embodiment, an example has been described in which various information is notified to the remote controller 60 installed in the manager's room. However, instead of the remote controller 60, similar information may be notified to a system controller of an air conditioning system.

[0163] The above embodiments will be summarized. (Item 1) The present disclosure relates to an air conditioning system (100) including a heat source unit (10), a first indoor unit (20a) having a heat exchanger (242) that exchanges heat with the heat source unit via a refrigerant and that blows conditioned air into a space to be air-conditioned, a first shutoff unit (30a) having a first shutoff valve (34), a control device (15), and a display (51), the heat source unit and the first indoor unit are connected by a first pipe (121) through which a refrigerant flows, the first indoor unit has a sensor terminal (23a) for connecting a refrigerant sensor (23) that detects a refrigerant leak, and the first shutoff unit closes the first pipe with the first shutoff valve (step Step S5), the control device communicates with the first shutoff unit and the first indoor unit to obtain configuration information regarding the equipment to prepare for refrigerant leakage (step S304), the configuration information includes information regarding each of the first shutoff unit and the first indoor unit, and when the control device receives a command to start the air conditioning system, it controls the air conditioning system to an interlock state in which air conditioning operation is prohibited (step S301), the display displays the configuration information in the interlock state (step S307), and when the control device receives information indicating user approval of the configuration information, it releases the interlock state (step S506).

[0164] (2) The air conditioning system described in 1 further includes a first alarm unit (40a) arranged in the space to be air-conditioned, the first alarm unit having an indoor refrigerant sensor (43) that detects refrigerant leaks and an alarm (44, 45) that issues an alarm when a refrigerant leak is detected by the indoor refrigerant sensor, the first shut-off unit is configured to communicate with the first alarm unit, and when a refrigerant leak is detected by one of the refrigerant sensor and the indoor refrigerant sensor, the first shut-off unit closes the first piping with the first shut-off valve (steps S5, S34), and the configuration information includes information related to the first alarm unit.

[0165] (Section 3) In the air conditioning system described in Section 2, the first shut-off unit is configured to communicate with a plurality of alarm units including the first alarm unit, and the configuration information includes the number of alarm units connected to the first shut-off unit (Figure 15).

[0166] (4) In the air conditioning system described in paragraph 2 or 3, the display is configured to display a first screen that displays information about the first indoor unit and a second screen that displays information about the first shutoff unit (FIG. 15), the information about the first indoor unit includes information indicating the presence or absence of a refrigerant sensor, and the information about the first shutoff unit includes information about a first alarm unit that is configured to communicate with the first shutoff unit.

[0167] (5) The air conditioning system described in 3 further includes a second indoor unit (20b) and a second shutoff unit (30b) having a second shutoff valve (34), the heat source unit and the second indoor unit are connected by a second pipe (122) through which a refrigerant flows, the second shutoff unit closes the second pipe with the second shutoff valve when a refrigerant leak is detected by either a refrigerant sensor connected to the second indoor unit or an alarm unit configured to communicate with the second shutoff unit, the control device acquires configuration information by communicating with the first shutoff unit, the second shutoff unit, the first indoor unit, and the second indoor unit, and the configuration information includes information relating to each of the second indoor unit and the second shutoff unit.

[0168] (6) In the air conditioning system described in any one of paragraphs 1 to 5, after displaying the configuration information, if information indicating the user's disapproval of the configuration information is input to the air conditioning system, the display displays a message on the display prompting the user to confirm the configuration of the air conditioning system (step S508).

[0169] (7) The air conditioning system described in any one of paragraphs 1 to 6 further includes a remote controller (50) for communicating with the first indoor unit and setting the first indoor unit, and the display is located on the remote controller (Figure 2).

[0170] (Item 8) In the air conditioning system described in item 7, the remote controller issues an alarm when the refrigerant sensor detects a refrigerant leak (step S3).

[0171] (Item 9) In the air conditioning system described in any one of Items 1 to 8, the control device is disposed in the heat source unit (FIG. 5).

[0172] (Clause 10) The air conditioning system described in clause 1 is provided with a plurality of shut-off units including a first shut-off unit and a plurality of indoor units including a first indoor unit, and a control device is disposed in the heat source unit, the control device identifies the number of the plurality of shut-off units, the number of the plurality of indoor units, and the connection relationship between the shut-off units and the indoor units, and the control device transmits information regarding the connection relationship to each of the plurality of indoor units and the plurality of shut-off units.

[0173] (Clause 11) The air conditioning system described in Clause 10 further includes a first alarm unit arranged in the space to be air-conditioned, the first alarm unit having an indoor refrigerant sensor that detects refrigerant leaks and an alarm that sounds an alarm when a refrigerant leak is detected by the indoor refrigerant sensor, the first shut-off unit is configured to communicate with the first alarm unit, the first shut-off unit closes the first piping with the first shut-off valve when a refrigerant leak is detected by one of the refrigerant sensor and the indoor refrigerant sensor, the configuration information includes information related to the first alarm unit, and the first indoor unit identifies the first shut-off unit and obtains information related to the first alarm unit based on information related to the connection relationship received from the control device.

[0174] (Clause 12) The air conditioning system described in Clause 11 further includes a remote controller for communicating with the first indoor unit and configuring the first indoor unit, the display being disposed on the remote controller, and the indoor unit displaying configuration information on the display based on information regarding the connection relationship received from the control device and information regarding the first alarm unit.

[0175] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present disclosure is defined by the claims, not by the description of the above embodiments, and is intended to include all modifications within the meaning and scope of the claims.

[0176] 10 Outdoor unit (heat source unit), 11, 21, 31, 41 Processor, 12, 22, 32, 42 Memory, 13, 26, 33 Communication circuit, 14, 24 Air conditioning mechanism, 15 Control device, 20, 20a to 20e Indoor unit, 23, 43 Refrigerant sensor, 23a Sensor terminal, 25 Sensor setting switch, 27, 37, 47 Communication interface, 30, 30a, 30b Shut-off unit, 34, 34a, 34b Shut-off valve, 35 Standby power supply, 36 b-contact relay, 40, 40a to 40d Alarm unit, 44 Speaker, 45 LED, 50, 50a to 50e, 60 Remote controller, 51 Display, 52 Operation unit, 90 Diversion controller, 91 Diversion mechanism, 100 Air conditioning system, 120 to 126, 121a, 121b piping, L1 to L3 communication path, 141 compressor, 142, 242 heat exchanger, 243 expansion valve, 144, 244 fan, 145 four-way valve, 300 board, 370 terminal, A to D rooms.

Claims

1. An air conditioning system, A heat source machine, a first indoor unit having a heat exchanger that exchanges heat with the heat source unit via a refrigerant and that blows conditioned air into the space to be air-conditioned; a first shutoff unit having a first shutoff valve; a control device; a display; The heat source unit and the first indoor unit are connected by a first pipe through which a refrigerant flows, the first indoor unit has a sensor terminal for connecting a refrigerant sensor that detects refrigerant leakage, the first shutoff unit closes the first pipe with the first shutoff valve when a refrigerant leak is detected by the refrigerant sensor; The control device acquires configuration information regarding equipment to prepare for refrigerant leakage, the configuration information includes information about each of the first shutoff unit and the first indoor unit, when the control device receives a start command for the air conditioning system, the control device controls the air conditioning system to an interlock state in which air conditioning operation is prohibited, the display displays the configuration information in the interlock state; The air conditioning system, wherein the control device releases the interlock state when it receives information indicating user approval of the configuration information.

2. Further, a first alarm unit is provided in the air-conditioned space, The first alarm unit an indoor refrigerant sensor for detecting refrigerant leaks; an alarm that issues an alarm when a refrigerant leak is detected by the indoor refrigerant sensor; the first blocking unit is configured to communicate with the first alarm unit; the first shutoff unit closes the first pipe with the first shutoff valve when a refrigerant leak is detected by one of the refrigerant sensor and the indoor refrigerant sensor; The air conditioning system according to claim 1 , wherein the configuration information includes information relating to the first alarm unit.

3. the first blocking unit is configured to communicate with a plurality of alarm units including the first alarm unit; The air conditioning system of claim 2 , wherein the configuration information includes the number of the alarm units configured to communicate with the first shutoff unit.

4. the display is configured to display a first screen that displays information about the first indoor unit and a second screen that displays information about the first shut-off unit, The information related to the first indoor unit includes information indicating the presence or absence of the refrigerant sensor, 4. The air conditioning system according to claim 2, wherein the information about the first shutoff unit includes information about the first alarm unit configured to communicate with the first shutoff unit.

5. A second indoor unit; a second shutoff unit having a second shutoff valve; The heat source unit and the second indoor unit are connected by a second pipe through which a refrigerant flows, the second shutoff unit closes the second pipe with the second shutoff valve when a refrigerant leak is detected by either the refrigerant sensor connected to the second indoor unit or the alarm unit configured to communicate with the second shutoff unit; the control device acquires the configuration information by communicating with the first shutoff unit, the second shutoff unit, the first indoor unit, and the second indoor unit; The air conditioning system according to claim 3 , wherein the configuration information includes information relating to each of the second indoor unit and the second shutoff unit.

6. An air conditioning system as described in any one of claims 1 to 3, wherein the display displays the configuration information and then, if information indicating the user's disapproval of the configuration information is input into the air conditioning system, displays a message prompting the user to confirm the configuration of the air conditioning system.

7. a remote controller for communicating with the first indoor unit and setting the first indoor unit; The air conditioning system according to any one of claims 1 to 3, wherein the display is disposed on the remote controller.

8. The air conditioning system according to claim 7, wherein the remote controller issues an alarm when a refrigerant leak is detected by the refrigerant sensor.

9. The air conditioning system according to any one of claims 1 to 3, wherein the control device is disposed in the heat source unit.

10. A plurality of breaking units including the first breaking unit; a plurality of indoor units including the first indoor unit, The control device is disposed in the heat source machine, the control device identifies the number of the plurality of shutoff units, the number of the plurality of indoor units, and the connection relationship between the shutoff units and the indoor units; The air conditioning system according to claim 1 , wherein the control device transmits information relating to the connection relationships to each of the indoor units and the shutoff units.

11. Further, a first alarm unit is provided in the air-conditioned space, The first alarm unit an indoor refrigerant sensor for detecting refrigerant leaks; an alarm that issues an alarm when a refrigerant leak is detected by the indoor refrigerant sensor; the first blocking unit is configured to communicate with the first alarm unit; the first shutoff unit closes the first pipe with the first shutoff valve when a refrigerant leak is detected by one of the refrigerant sensor and the indoor refrigerant sensor; the configuration information includes information about the first alarm unit; The air conditioning system according to claim 10, wherein the first indoor unit identifies the first shutoff unit and acquires information about the first alarm unit based on the information about the connection relationship received from the control device.

12. a remote controller for communicating with the first indoor unit and setting the first indoor unit; the display is disposed on the remote controller; The air conditioning system according to claim 11, wherein the indoor unit displays the configuration information on the display based on the information relating to the connection relationship and the information relating to the first alarm unit received from the control device.

13. An air conditioning system as described in claim 1, wherein the control device acquires the configuration information by communicating with the first shut-off unit and the first indoor unit.