Central air conditioning unit training system (engineering type)

DB-12B Central Air Conditioning Unit Training System (Engineering Type) DB-12B Central Air Conditioning Unit Training System (Engineering Type) is a product developed in accordance with the requirements of the Ministry of Education's revitalization of the 21st century vocational education curriculum reform and textbook construction plan, and in accordance with the teaching and training requirements of vocational education

DB-12B Central Air Conditioning Training System (Engineering Type)

The DB-12B Central Air Conditioning Unit Training System (Engineering Type) is a product developed in accordance with the requirements of the Ministry of Education's "Revitalization of Vocational Education Curriculum Reform and Textbook Construction Plan for the 21st Century" and the teaching and training requirements of vocational education. Suitable for practical training in refrigeration technology, refrigeration fluid machinery, principles and maintenance of household refrigeration equipment, cold storage and refrigeration technology, refrigeration equipment maintenance workers (junior, intermediate, advanced) in vocational colleges and vocational schools. To cultivate applied talents who master the theoretical knowledge and practical skills of air conditioning and refrigeration technology, and are engaged in the upgrading, renovation, design, installation, commissioning, maintenance, repair, technical management, and other aspects of air conditioning and refrigeration equipment and systems.
The central air conditioning unit training system (engineering type) is also suitable for ordinary colleges, technical schools, vocational training schools, vocational education centers, appraisal stations/institutes, refrigeration majors such as "Refrigeration Equipment Maintenance Worker (Advanced)", "Refrigeration Equipment Principles and Maintenance", "Refrigeration Air Conditioning Unit Operation, Installation and Maintenance", "Central Air Conditioning Worker (Junior, Intermediate, Advanced)", "Household Refrigeration Equipment Principles and Maintenance" and other courses.
2、 Characteristics
1. Diversification of system terminal processing units: Three forms of terminal processing units using fan coil units are adopted; Enable students to understand the diverse structural forms of indoor units.
2. Each terminal processor is equipped with a refrigeration system process board, control circuit process board, temperature gauge, and pressure gauge, which can observe all control circuits of the unit.
3. Integrity and independence of the system: Its control function, protection function, and display function are completely consistent with the actual central air conditioning, and each user terminal can be independently controlled under the same operating conditions.
4. The control panel only requires an AC 380V power supply to be put into use, occupying a small area, saving space, and reducing infrastructure investment.
5. The device intuitively displays the system structure and working principle of household central air conditioning, which facilitates teachers' demonstration and students' understanding and mastery of textbook knowledge. The structure is reasonable and the appearance is beautiful. The device is compact and the appearance is elegant. The training table is also equipped with four universal wheels and four fixed adjustment mechanisms, which are easy to move and fix.
6. The training device system is equipped with a simulated fault setting function, which can set faults in the refrigeration system and electrical system. Improving students' analytical ability through specific phenomena is beneficial for them to apply theory to practice and cultivate their practical hands-on skills.
7. Equipped with current type leakage protection device, if the ground leakage current exceeds a certain value, it will trip and cut off the power supply; And there are thermal protection devices that provide overheat and overload protection for the compressor.

3、 Technical parameters
1. Input power supply: single-phase three wire~380V ± 10% 50Hz
2. Working environment: The ambient temperature range is -5 ℃ to+40 ℃, with a relative humidity of less than 85% (25 ℃) and an altitude of less than 4000m
3. Device capacity: ＜ 10.8kVA
4. Dimensions: 10000mm × 11000mm × 2100mm
5. Refrigerant type: R22
6. Safety protection: equipped with leakage voltage and leakage current protection devices, in compliance with national standards for safety
4 Basic components of the device
1. Fully demonstrated the structural form, control principle, parameter changes under different operating conditions of the central air conditioning system, and the flow chart of the air conditioning refrigeration system.
2. The device chassis adopts a reinforced sheet metal structure design, and the frame is composed of aluminum profiles combined with aluminum-plastic panel covers.
3. Three sets of intelligent temperature controllers: Intelligent temperature control can measure and display the temperature of the controlled object, adjust the upper and lower temperature limits, and complete functions such as cooling, heating, and shutdown; Display the working status and facilitate observation of the temperature inside the air-conditioned room, making it easy to operate.
4. Workflow diagram board set. The workflow diagram board provides a detailed explanation of the refrigeration system process, monitoring point temperature, system pressure, working status indication, and system component description.
5. One set of measuring instruments: equipped with pointer vacuum pressure gauge, temperature display instrument, etc.
6. Cooling component introduction diagrams and explanations are hung under each component of the air conditioning system.

5、 Key accessories
1) Main technical parameters of PLC:
The configuration of the main station module is:
FX2N-48MR: The main station PLC host is connected to the upper computer and displays the central air conditioning operating parameters controlled and collected by the slave station PLC on the upper computer. The upper computer is equipped with configuration software.
FX2N-48CCL: As the master module of CC-LINK, it communicates with the PLC of the slave module via fieldbus.
2) Touch screen module
C P U: Intel 1037U 1.8GHz 22nm dual core processor TDP 17W ultra-low power processor
Motherboard: Intel M11 Industrial Control Solid State Energy saving Motherboard
Memory: 1G DDR3 1333 ultra high speed memory, supports 1333/1066MHz memory, and can support up to 8GB.
Hard drive: 24GB SSD solid state drive
Graphics card: Integrated with Intel HD Graphics core graphics card, providing VGA, LVDS, dual HDMI display output, LVDS supports dual channel 24 bit, supports separate display, dual display replication, and dual display expansion.
Sound card: Integrated ALC662 6-channel high fidelity audio controller
Network card: Integrated with one RTL gigabit network card, supporting network wake-up and PCIe functions.
Power supply: External power supply (100V to 220V wide voltage, globally applicable)
Display screen: 13 inch LED industrial control screen Resolution: 1024 * 600
Touch screen: Taiwan Military Touchkit 4-wire touch screen with high transparency; Stable performance, sensitive touch
Machine interface: 4 * USB 2.0 interfaces, two of which can support USB 3.0 (customization required),
1 * HDMI interface: 1 * VGA interface, 1 * RJ-45 network interface, 1 * Line out (green), 1 * Mic (red)
2 * COM serial port, 1 * 12V DC_JACK input interface
3) Relay module
The relay module is equipped with intermediate relays (AC220V), AC contactors (AC220V), thermal relays, leakage protection switches, fuses, time relays, and other components. With the relay module, process control of central air conditioning experimental equipment can be independently achieved.
4) Instrument module
The instrument module is equipped with digital temperature control instruments, temperature instruments, ammeters, voltmeters, etc., which are used to monitor the working current and voltage of executing components such as compressors, fans, and circulating water pumps, and to monitor the temperature of cooling components such as air outlets, return air outlets, and condensers.
5) A. Three phase main switch with leakage protection; b. Three phase power supply fuse; c. Compressor voltage indication; d. Compressor current indication; e. Simulate boiler current indication; f. Cold water pump pressure indication; g. Hot water pump operation indicator; h. Operation indication of cooling water pump; i. Air conditioning fan current indication; j. Compressor working instructions; k. Simulate boiler operation instructions; l. Working instructions for chilled water pump; m. Cooling tower operation instructions; n. Cooling tower fan operation indication; o. Air conditioning fan operation indicator; p. Digital display of chilled water temperature regulation indicator; q. Temperature indication of hot water; r. Digital cooling indicator; s. Refrigeration switch; t. Digital display cold water temperature high adjustment indicator; u. Heating switch; v. Digital display hot water temperature adjustment indicator.
6) Button and signal module
Button and signal module, equipped with mode switch (automatic and manual modes), buttons, and indicator lights, used to control the operation of central air conditioning, such as compressor start and stop, main fan start and stop, etc. The button and signal module can be connected to the relay module to achieve relay circuit control, and can also be connected to the PLC to achieve PLC circuit control.
7、 Central air conditioning host system
1) The main components of the refrigeration system are: compressor, evaporator, condenser, solenoid valve, filter, expansion valve, sight glass, liquid storage tank, spray cooling tower, cooling water pump, refrigeration water pump. The main components of the heating system are: electric heating analog boiler, digital temperature regulator, hot water pump, etc.
2) The refrigeration system consists of a compressor, evaporator, condenser, solenoid valve, thermal expansion valve, liquid storage tank, sight glass, drying filter, and pressure gauge. There is a sight glass connected in series in the pipeline, which can observe the physical state and flow direction of the refrigerant. The solenoid valve connected in series in the pipeline serves as the on-off control component of the refrigeration system, and the high and low pressure gauges display high and low pressure.
3) The cooling water circulation system mainly consists of cooling water pumps, spray cooling towers, and circulation pipelines, which are used to absorb the heat emitted by the refrigerant in the condenser.
4) The refrigerant water circulation system mainly consists of refrigerant water pumps and circulation pipelines, which are used to deliver the cold generated by the evaporation of refrigerant in the evaporator to simulated users.
5) Equipped with a heat source system module. The heating system consists of one central air conditioning dedicated heater, one hot water pump, manual valve, etc.

8、 System Configuration Checklist

serial number	Project (Equipment Name)		quantity		Remarks
1	Central air conditioning unit (8P chiller semi enclosed compressor, water-cooled shell condenser). Pressure controller, oil separator. Pressure expansion valve		1 set	8P water-cooled semi enclosed unit ZR94KCT-FD
2	Fresh air conditioning duct group		1 set
3	Refrigeration and heating pipeline group		1 set
4	Chilled water return pump		1 set	0.75KW vertical water pump
5	Central air conditioning original dedicated heating processor 3000W/3.5A		1 set	380V stainless steel
6	Courtyard style fan coil unit		1 set	2P
7	F34 fan coil unit		1 set	1P
8	Mode air conditioning fan panel		1 set	1
9	condenser		1 set	8P shell condenser
10	Expansion water tank (with automatic makeup water pump system)		1 set	Stainless steel 400 * 300 * 300
11	cooling tower		1 set	5 Water cooling
12	cooling fan		1 set	220V
13	Cooling water return pump 0.75K0W vertical pipeline water pump		1 set
14	Air conditioning simulation room		1 set	School classrooms
15	Cooling and heating temperature detectors		1 set
16	Air duct pipeline		1 set	1000 * 300 * 500, 10 meters
17	Air duct hanger		1 set	custom-made
18	Iron ventilation pipeline		1 set	1000*300*500
19	Control box distribution cabinet 800 × 600 × 1700mm (with 1 Mitsubishi PLC FX built-in)3U48MR and related relays, control switches, indicator lights, standard communication interfaces, and supporting equipment		1 set	800*700*1600
20	Pressure module		1 set	Brand: Mitsubishi; country of origin:
21	PLC FX2N-2AD functional module: used to collect temperature signals of the central air conditioning model system, and can achieve simultaneous collection of up to 2 temperature signals		1 set
22	air vent		1 set
23	Water temperature control valve		1 set
24	Insulation pipe 32MM pipe 50m Insulation pipe 25MM pipe 50m		1 set	Based on practical engineering applications
25	PPR waterway fittings 32MM pipe 50m PPR waterway fittings 25MM pipe 50m		1 set	Based on practical engineering applications
26	water pressure gauge		1 set
27	Diffuser (circular, square, rectangular)		1 set
28	Instruction Manual		1 set
29	Pressure sensor 0-5V		1 set
29	Water pump control box		2 sets
30	Lift valve 32MM Lift valve 32MM		1 set
31		分水器出水口32MM	1 set	1 in, 4 out
32		Water collector outlet 32MM	1 set	1 in, 4 out
33		Air handling system, 1 set of supply air duct, 1 set of return air duct and related supporting equipment	1 set
34		fire damper The melting temperature of the melting ring is 70 ℃ - Manually reset and open, manually adjust angle - Valve fire resistance rating of 3 hours When fully open, the resistance coefficient is less than 0. The air valve is manually closed and manually opened.	1 set
35		silenced plenum box Organize the airflow to distribute it evenly. 2. It is beneficial for the attenuation of NC value, and the effect is better if soundproof boards are attached inside the static pressure box	1 set
36		Fan coil temperature controller	1 set	liquid crystal
37		Engineering Materials	1 set	Based on on-site installation
38		Central air conditioning PLC application program	1 set
39		Industrial configuration software	1 set
40		PLC programming software	1 set
41		Central air conditioning PLC application program	1 set
42		Central air conditioning configuration application program	1 set
43		Host control box	1 set
45		Fan coil temperature control valve	3 sets	wire control
46		Fan coil hose	1 set
47		Wire conduit 25MM (bend, direct)	several