Flexible regulation and control protocol conversion device and flexible regulation and control system for central air conditioner

Abstract

According to the flexible regulation and control protocol conversion device and the flexible regulation and control system of the central air conditioner, when the flexible regulation and control protocol conversion device of the central air conditioner is powered on to operate, a microprocessor module can disconnect an uplink and downlink communication connection control module, so that direct communication between a building equipment automatic control system and central air conditioner control equipment is temporarily interrupted; at the moment, the flexible regulation and control protocol conversion device of the central air conditioner dominates communication; when the central air conditioner flexible regulation and control protocol conversion device is powered down, the uplink and downlink communication connection control module automatically recovers conduction, the building equipment automatic control system is in direct communication with the central air conditioner control equipment, and the central air conditioner flexible regulation and control protocol conversion device does not participate in the communication process. Therefore, when the flexible regulation and control protocol conversion device of the central air conditioner is powered off, the communication link can be automatically switched to the local building equipment automatic control system of the user, so that the normal regulation and control function of the air conditioner user is maintained, and the working reliability of the whole system is improved.

Description

Technical Field

[0001] This application relates to the field of central air conditioning control technology, and in particular to a central air conditioning flexible control protocol conversion device and flexible control system. Background Technology

[0002] In recent years, with the rapid increase in large commercial complexes, the electricity load of central air conditioning systems has risen sharply, becoming a key factor in seasonal power supply shortages. Traditional central air conditioning load control methods employ rigid load control, i.e., directly cutting off the power supply. Although simple to operate, these methods suffer from insufficient flexibility, poor user experience, and low user participation.

[0003] A novel flexible load control method flexibly adjusts the workload of the air conditioning unit by modifying its operating status, such as chilled water outlet temperature, current ratio, and implementing soft shutdown. This control method not only improves the flexibility of load control but also enhances user experience, increases user participation, and is cost-effective with good compatibility with building automation systems. Based on this, patent CN115962543 discloses an intelligent building air conditioning energy-saving system and method based on edge computing terminals. By deploying edge nodes near the air conditioning equipment and installing edge computing terminals in the building control cabinet, real-time acquisition and processing of air conditioning equipment operating data is achieved. The edge computing terminals can match the collected data with an optimized operating strategy library, select and fine-tune the air conditioning equipment's operating strategy, and then send control signals to the edge nodes to achieve flexible control of the air conditioning equipment. However, if the edge nodes in the system fail to operate due to power failure or malfunction, the edge computing terminals in the building control cabinet will be unable to control them, thus affecting the flexible control effect of the air conditioning equipment and reducing the overall system reliability. Utility Model Content

[0004] Therefore, it is necessary to provide a central air conditioning flexible control protocol conversion device and flexible control system to address the problem of low reliability of existing central air conditioning flexible control systems.

[0005] In a first aspect, this application provides a central air conditioning flexible control protocol conversion device. The device includes a microprocessor module, an uplink communication module, an uplink / downlink communication connection control module, and a downlink communication module; the first end of the uplink communication module is connected to the microprocessor module, and the second end is connected to a building automation system; the first end of the downlink communication module is connected to the microprocessor module, and the second end is connected to a central air conditioning control device; the first end of the uplink / downlink communication connection control module is connected to the third end of the uplink communication module, the second end is connected to the third end of the downlink communication module, and the third end of the uplink / downlink communication connection control module is connected to the microprocessor module.

[0006] When the central air conditioning flexible control protocol conversion device is powered on, the microprocessor module disconnects the uplink and downlink communication connection control module, and the building equipment automation system communicates with the central air conditioning control equipment through the central air conditioning flexible control protocol conversion device; when the central air conditioning flexible control protocol conversion device is powered off, the uplink and downlink communication connection control module is turned on, and the building equipment automation system communicates directly with the central air conditioning control equipment.

[0007] In one embodiment, the uplink communication module includes two slave device RS-485 circuits and one Ethernet communication circuit; the first end of the first slave device RS-485 circuit is connected to the microprocessor module, and the second end is connected to the building equipment automatic control system; the first end of the second slave device RS-485 circuit is connected to the microprocessor module, and the second end is connected to the intelligent measurement terminal or load control terminal; the first end of the Ethernet communication circuit is connected to the microprocessor module, and the second end is connected to the network device.

[0008] In one embodiment, the downlink communication module includes two master device RS-485 circuits; the first end of the first master device RS-485 circuit is connected to the microprocessor module, and the second end is connected to the central air conditioning control device; the first end of the second master device RS-485 circuit is connected to the microprocessor module, and the second end is connected to the sensing device.

[0009] In one embodiment, the uplink and downlink communication connection control module includes a normally closed relay. The first end of the normally closed relay is connected to the third end of the uplink communication module, the second end is connected to the third end of the downlink communication module, and the third end of the normally closed relay is connected to the microprocessor module.

[0010] In one embodiment, the central air conditioning flexible control protocol conversion device further includes a debugging module, with the first end of the debugging module connected to the microprocessor module and the second end connected to the debugging equipment.

[0011] In one embodiment, the debugging module includes a slave device RS-485 circuit and a Bluetooth communication circuit; the first end of the slave device RS-485 circuit is connected to the microprocessor module, and the second end is connected to a first type of debugging device; the first end of the Bluetooth communication circuit is connected to the microprocessor module, and the second end is connected to a second type of debugging device.

[0012] In one embodiment, the central air conditioning flexible control protocol conversion device further includes a storage module, a display module, and a power module, all of which are connected to a microprocessor module.

[0013] In one embodiment, the display device includes a dot-matrix liquid crystal display, four indicator lights, and four buttons.

[0014] In one embodiment, the power module includes an AC power supply unit and a DC power supply unit.

[0015] Secondly, this application also provides a flexible control system for central air conditioning. The system includes a building automation system, an intelligent measurement terminal, a central air conditioning control device, a molded case circuit breaker, related central air conditioning equipment, and a flexible control protocol conversion device for central air conditioning as described in any of the above embodiments. The intelligent measurement terminal is connected to the first terminal of the flexible control protocol conversion device, the building automation system is connected to the second terminal of the flexible control protocol conversion device, the first terminal of the central air conditioning control device is connected to the third terminal of the flexible control protocol conversion device, the molded case circuit breaker is connected to the second terminal of the central air conditioning control device, and the third terminal of the central air conditioning control device is connected to the related central air conditioning equipment.

[0016] The aforementioned flexible control protocol conversion device and flexible control system for central air conditioning operate as follows: When the flexible control protocol conversion device is powered on, the microprocessor module disconnects the uplink and downlink communication connection control module, temporarily interrupting the direct communication between the building equipment automation system and the central air conditioning control equipment. During this time, the flexible control protocol conversion device will take the lead in communication. When the flexible control protocol conversion device loses power, the uplink and downlink communication connection control module will automatically resume conduction, and the building equipment automation system will communicate directly with the central air conditioning control equipment. The flexible control protocol conversion device will not participate in the communication process. This ensures that when the flexible control protocol conversion device itself loses power, it can automatically switch the communication link to the user's local building equipment automation system, thereby maintaining the normal control function of the air conditioning user and improving the overall system reliability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a central air conditioning flexible control protocol conversion device in one embodiment;

[0018] Figure 2 This is a schematic diagram of the structure of a central air conditioning flexible control protocol conversion device in one embodiment;

[0019] Figure 3 This is a schematic diagram of the central air conditioning flexible control protocol conversion device in another embodiment;

[0020] Figure 4 This is a schematic diagram of the structure of a central air conditioning flexible control system in one embodiment;

[0021] Figure 5 This is a schematic diagram of the wiring terminals of a central air conditioning flexible control protocol conversion device in one embodiment. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0023] Example 1

[0024] like Figure 1 As shown, this embodiment provides a central air conditioning flexible control protocol conversion device, specifically including a microprocessor module 100, an uplink communication module 200, an uplink / downlink communication connection control module 300, and a downlink communication module 400. The first end of the uplink communication module 200 is connected to the microprocessor module 100, and the second end is connected to the building equipment automation system. The first end of the downlink communication module 400 is connected to the microprocessor module 100, and the second end is connected to the central air conditioning control equipment. The first end of the uplink / downlink communication connection control module 300 is connected to the third end of the uplink communication module 200, and the second end is connected to the third end of the downlink communication module 400. The third end of the uplink / downlink communication connection control module 300 is also connected to the microprocessor module 100. When the central air conditioning flexible control protocol conversion device is powered on, the microprocessor module 100 disconnects the uplink / downlink communication connection control module 300, and the building equipment automation system communicates with the central air conditioning control equipment through the central air conditioning flexible control protocol conversion device. When the central air conditioning flexible control protocol conversion device is powered off, the uplink / downlink communication connection control module 300 is turned on, and the building equipment automation system communicates directly with the central air conditioning control equipment. Preferably, the microprocessor module 100 of the central air conditioning flexible control protocol conversion device can adopt a 32-bit ARM Cortex M0+ core and integrate 1MB of embedded flash memory and 512KB of static random access memory.

[0025] Among them, such as Figure 2 As shown, the uplink communication module 200 includes two slave device RS-485 circuits and one Ethernet communication circuit. The first slave device RS-485 circuit has one end connected to the microprocessor module 100 and the second end connected to the building automation system; the second slave device RS-485 circuit has one end connected to the microprocessor module 100 and the second end connected to an intelligent measurement terminal or load control terminal. The Ethernet communication circuit has one end connected to the microprocessor module 100 and the second end connected to a network device. In some embodiments, the network device can be a control computer. The downlink communication module 400 includes two master device RS-485 circuits; the first master device RS-485 circuit has one end connected to the microprocessor module 100 and the second end connected to a central air conditioning control device; the second master device RS-485 circuit has one end connected to the microprocessor module 100 and the second end connected to a sensing device. In some embodiments, the sensing device can include a water immersion sensor, a temperature and humidity sensor, etc.

[0026] In an RS-485 communication network, devices are categorized into slave devices and master devices. Slave RS-485 circuits refer to the interface circuits used as slave devices in the network; they are typically in a controlled or monitored state, waiting for and responding to commands or requests from master devices. Conversely, master RS-485 circuits refer to the interface circuits used as master devices in the network, playing a core role in initiating communication, controlling the communication process, and managing communication data. In this example, when facing uplink communication devices such as building automation systems, intelligent measurement terminals, load control terminals, and network devices, the microprocessor module 100 acts as a slave device, responsible for receiving commands or requests from these devices. When facing downlink communication devices such as central air conditioning control equipment and sensing devices, the microprocessor module 100 transforms into a master device, sending control commands to them. It is worth noting that, whether acting as a slave or master device, the microprocessor module 100 can implement its communication functions through existing RS-485 interface circuits.

[0027] Specifically, the microprocessor module 100 can receive control commands from intelligent measurement terminals or load control terminals, as well as control commands from the building automation system. The microprocessor module 100 converts the control commands sent by the intelligent measurement terminals or load control terminals into preset control commands specific to the brand and model of the central air conditioning system. This conversion process ensures that the control commands can accurately act on the central air conditioning control equipment corresponding to the specific brand and model, thereby regulating downstream equipment such as condensers and compressors. Simultaneously, the microprocessor module 100 can also analyze the control commands sent by the building automation system. When a control command sent by the building automation system conflicts with a control command sent by the intelligent measurement terminal or load control terminal, the microprocessor module 100 will stop forwarding the control command sent by the building automation system and simulate a fake message to reply to the control command sent by the building automation system, preventing the building automation system from issuing an alarm due to the lack of a reply message. Furthermore, for non-control commands sent by the building automation system, the microprocessor module 100 adopts a time-sharing processing strategy, processing the non-control commands in a time-sharing manner before forwarding them to the central air conditioning control equipment, ensuring that these instructions are forwarded to the central air conditioning control equipment in an orderly manner. Once the central air conditioning control equipment responds to these non-control commands and sends a reply message, the microprocessor module 100 will also forward the reply message to the building automation system, thereby maintaining the real-time monitoring function of the building automation system on the status of the central air conditioning without being affected.

[0028] The uplink and downlink communication connection control module 300 includes one normally closed relay. The first end of the normally closed relay is connected to the third end of the uplink communication module 200, the second end is connected to the third end of the downlink communication module 400, and the third end of the normally closed relay is connected to the microprocessor module 100.

[0029] Specifically, when the central air conditioning flexible control protocol conversion device is powered on, the microprocessor module 100 actively disconnects the normally closed relay. At this time, the direct communication link between the building automation system and the central air conditioning control equipment is broken, and all communication must be forwarded through the central air conditioning flexible control protocol conversion device, which plays a leading role in communication. Conversely, if the device is powered off, the normally closed relay will no longer be controlled by the microprocessor module 100 and will automatically return to its normally closed state, thereby re-establishing the direct communication link between the building automation system and the central air conditioning control equipment. In this case, the central air conditioning flexible control protocol conversion device will no longer intervene in the communication process. This scheme ensures that when the central air conditioning flexible control protocol conversion device itself is powered off, it can automatically switch the communication link to the user's local building automation system, guaranteeing the air conditioning user's control.

[0030] Furthermore, Figure 5 The wiring terminals for each circuit are shown. Specifically, the first slave device RS-485 circuit has terminals 485A2 and 485B2, used to connect to the building automation system; the second slave device RS-485 circuit has terminals 485A1 and 485B1, used to connect to a smart measurement terminal or load control terminal; the Ethernet communication circuit has LAN-uplink terminals, used to connect to network devices. The first master device RS-485 circuit has terminals 485A3 and 485B3, used to connect to the central air conditioning control equipment; the second master device RS-485 circuit has terminals 485A5 and 485B5, used to connect to sensing devices.

[0031] In this embodiment, when the central air conditioning flexible control protocol conversion device is powered on, the microprocessor module 100 disconnects the uplink and downlink communication connection control module 300, thereby temporarily interrupting the direct communication between the building equipment automatic control system and the central air conditioning control equipment. At this time, the central air conditioning flexible control protocol conversion device will take the lead in communication. When the central air conditioning flexible control protocol conversion device loses power, the uplink and downlink communication connection control module 300 will automatically resume conduction, and the direct communication link between the building equipment automatic control system and the central air conditioning control equipment will be restored. The central air conditioning flexible control protocol conversion device will no longer participate in the communication process between the building equipment automatic control system and the central air conditioning control equipment. This ensures that when the central air conditioning flexible control protocol conversion device itself loses power, it can automatically switch the communication link to the user's local building equipment automatic control system, thereby maintaining the normal control function of the air conditioning user and improving the overall system reliability.

[0032] Example 2

[0033] The difference from Example 1 is that, as Figure 1 and Figure 2 As shown, the central air conditioning flexible control protocol conversion device in this embodiment further includes a debugging module 500. The debugging module 500 includes one slave device RS-485 circuit and one Bluetooth communication circuit. The first end of the slave device RS-485 circuit is connected to the microprocessor module 100, and the second end is connected to a first type of debugging device. The first end of the Bluetooth communication circuit is connected to the microprocessor module 100, and the second end is connected to a second type of debugging device. For example, the first type of debugging device can be a debugging computer. After the debugging computer is connected to the microprocessor module 100 via the slave device RS-485 circuit, it configures and debugs the central air conditioning flexible control protocol conversion device through a debugging program on the computer. The second type of debugging device can be a debugging device with a Bluetooth communication module, such as a mobile phone. When the mobile phone is connected to the microprocessor module 100 via the Bluetooth communication circuit, the configuration and debugging of the central air conditioning flexible control protocol conversion device can be achieved through a debugging APP on the mobile phone. Figure 5 The 485A4 and 485B4 are the wiring terminals for the slave device's RS-485 circuit, used to connect to the first type of debugging equipment. The Bluetooth communication circuit is built into the device.

[0034] The central air conditioning flexible control protocol conversion device in this embodiment is equipped with a debugging module 500 that includes one slave device RS-485 circuit and one Bluetooth communication circuit. This allows it to connect with various debugging devices, improving the efficiency of configuring and testing the device and thus further enhancing the operational reliability of the central air conditioning flexible control system.

[0035] Example 3

[0036] The difference from Example 1 is that, as Figure 3 As shown, the central air conditioning flexible control protocol conversion device in this embodiment further includes a storage module, a display module, and a power supply module, all of which are connected to the microprocessor module 100. Wherein, as Figure 5 As shown, the display device includes a dot-matrix LCD screen, four indicator lights, and four buttons. The four indicator lights are for device operation, uplink communication, downlink communication, and maintenance communication. For example, when the central air conditioning flexible control protocol conversion device is powered on and running, its operation indicator light will immediately illuminate. If the device is being debugged using debugging equipment, the maintenance communication indicator light will illuminate accordingly. Simultaneously, when the device achieves normal communication with the uplink communication device, the uplink communication indicator light will illuminate; and when it achieves normal communication with the downlink communication device, the downlink communication indicator light will illuminate accordingly. The four buttons are "Up," "Down," "Enter," and "Return."

[0037] The power supply module includes an AC power supply unit and a DC power supply unit. Figure 5 In the diagram, L and N markings represent the connection terminals for AC power supply units; while DC power supply units offer two connection methods: a power adapter connector or a Phoenix connector. Specifically, Figure 5 The DC+ and DC- markings refer to the Phoenix terminal connection points used in the DC power supply. The storage module consists of 32MB of FLASH memory.

[0038] The central air conditioning flexible control protocol conversion device in this embodiment, by adding a storage module, a display module, and a power supply module, not only improves data processing and display capabilities but also ensures stable power supply, thereby comprehensively enhancing the device's functionality, ease of operation, and operational reliability.

[0039] Example 4

[0040] like Figure 4 As shown, this embodiment provides a flexible central air conditioning control system, including a building equipment automatic control system, an intelligent measurement terminal, a central air conditioning control device, a molded case circuit breaker, central air conditioning related equipment, and a central air conditioning flexible control protocol conversion device as described in any of the above embodiments. The intelligent measurement terminal is connected to the first end of the central air conditioning flexible control protocol conversion device, the building equipment automatic control system is connected to the second end of the central air conditioning flexible control protocol conversion device, the first end of the central air conditioning control device is connected to the third end of the central air conditioning flexible control protocol conversion device, the molded case circuit breaker is connected to the second end of the central air conditioning control device, and the third end of the central air conditioning control device is connected to the central air conditioning related equipment.

[0041] The power lines first pass through a molded case circuit breaker into the central air conditioning control cabinet, and then through the control cabinet into the compressor, condenser, and other central air conditioning equipment. The intelligent measurement terminal receives instructions from the new power load management system via wireless communication and is connected to the central air conditioning flexible control protocol conversion device via wired RS-485 communication. This device receives control commands not only from the intelligent measurement terminal but also from the building automation system.

[0042] Specifically, the central air conditioning flexible control protocol conversion device can convert control commands from intelligent measurement terminals into preset control instructions for specific brands and models of central air conditioning units, thereby enabling precise control of downstream equipment (such as condensers and compressors) through the central air conditioning control cabinet. When processing control commands from the building automation system, if the control commands conflict with those from the intelligent measurement terminal, the central air conditioning flexible control protocol conversion device will pause forwarding the control commands from the building automation system and simulate a false message to reply to the control commands from the building automation system, preventing the building automation system from triggering an alarm if no reply message is received. For non-control commands from the building automation system, the central air conditioning flexible control protocol conversion device processes the commands in a time-sharing manner before forwarding them to the central air conditioning control cabinet, and forwards the reply message to the building automation system, thereby maintaining the normal monitoring function of the building automation system for the central air conditioning.

[0043] In addition, the device has a built-in normally closed relay. Once the device itself experiences a power outage or malfunction, it will automatically switch the communication link to the building equipment automation system, ensuring that the building equipment automation system can still communicate with the central air conditioning control cabinet in the event of device damage, so as to guarantee the continuity and stability of the system.

[0044] The central air conditioning flexible control system in this embodiment achieves efficient dual control of the central air conditioning system by both the intelligent measurement terminal and the building automation system through a central air conditioning flexible control protocol conversion device. This system not only improves the flexibility and response speed of the central air conditioning control but also effectively avoids conflicts in control commands, ensuring the stable operation of the central air conditioning system. Furthermore, in the event of a protocol conversion device failure, the built-in normally closed relay automatically switches the communication link, ensuring the building automation system's continuous monitoring capability of the central air conditioning system, further enhancing the system's reliability and stability.

[0045] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A central air conditioning flexible control protocol conversion device, characterized in that, The device includes a microprocessor module, an uplink communication module, an uplink / downlink communication connection control module, and a downlink communication module; the first end of the uplink communication module is connected to the microprocessor module, and the second end is connected to the building equipment automatic control system; the first end of the downlink communication module is connected to the microprocessor module, and the second end is connected to the central air conditioning control equipment; the first end of the uplink / downlink communication connection control module is connected to the third end of the uplink communication module, the second end is connected to the third end of the downlink communication module, and the third end of the uplink / downlink communication connection control module is connected to the microprocessor module. When the central air conditioning flexible control protocol conversion device is powered on, the microprocessor module disconnects the uplink and downlink communication connection control module, and the building equipment automation system communicates with the central air conditioning control equipment through the central air conditioning flexible control protocol conversion device; when the central air conditioning flexible control protocol conversion device is powered off, the uplink and downlink communication connection control module is turned on, and the building equipment automation system communicates directly with the central air conditioning control equipment.

2. The central air conditioning flexible control protocol conversion device according to claim 1, characterized in that, The uplink communication module includes two slave device RS-485 circuits and one Ethernet communication circuit. The first terminal of the RS-485 circuit of the first slave device is connected to the microprocessor module, and the second terminal is connected to the building equipment automatic control system; the first terminal of the RS-485 circuit of the second slave device is connected to the microprocessor module, and the second terminal is connected to the intelligent measurement terminal or load control terminal; the first terminal of the Ethernet communication circuit is connected to the microprocessor module, and the second terminal is connected to the network device.

3. The central air conditioning flexible control protocol conversion device according to claim 1, characterized in that, The downlink communication module includes two master device RS-485 circuits; the first end of the first master device RS-485 circuit is connected to the microprocessor module, and the second end is connected to the central air conditioning control device. The first end of the second master device RS-485 circuit is connected to the microprocessor module, and the second end is connected to the sensing device.

4. The central air conditioning flexible control protocol conversion device according to claim 1, characterized in that, The uplink and downlink communication connection control module includes one normally closed relay. The first end of the normally closed relay is connected to the third end of the uplink communication module, the second end is connected to the third end of the downlink communication module, and the third end of the normally closed relay is connected to the microprocessor module.

5. The central air conditioning flexible control protocol conversion device according to any one of claims 1-4, characterized in that, The device also includes a debugging module, with one end connected to the microprocessor module and the other end connected to a debugging device.

6. The central air conditioning flexible control protocol conversion device according to claim 5, characterized in that, The debugging module includes one slave device RS-485 circuit and one Bluetooth communication circuit; the first end of the slave device RS-485 circuit is connected to the microprocessor module, and the second end is connected to a first type of debugging device; the first end of the Bluetooth communication circuit is connected to the microprocessor module, and the second end is connected to a second type of debugging device.

7. The central air conditioning flexible control protocol conversion device according to claim 1, characterized in that, The device further includes a storage module, a display module, and a power module, all of which are connected to the microprocessor module.

8. The central air conditioning flexible control protocol conversion device according to claim 7, characterized in that, The display device includes a dot-matrix LCD screen, four indicator lights, and four buttons.

9. The central air conditioning flexible control protocol conversion device according to claim 7, characterized in that, The power module includes an AC power supply unit and a DC power supply unit.

10. A flexible control system for central air conditioning, characterized in that, The system includes a building equipment automation system, an intelligent measurement terminal, a central air conditioning control device, a molded case circuit breaker, central air conditioning related equipment, and a central air conditioning flexible control protocol conversion device as described in any one of claims 1-9. The intelligent measurement terminal is connected to the first end of the central air conditioning flexible control protocol conversion device, the building equipment automation system is connected to the second end of the central air conditioning flexible control protocol conversion device, the first end of the central air conditioning control device is connected to the third end of the central air conditioning flexible control protocol conversion device, the molded case circuit breaker is connected to the second end of the central air conditioning control device, and the third end of the central air conditioning control device is connected to the central air conditioning related equipment.

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