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4VD-15.2---4VG-30.2 DMZL piston refrigeration compressor

Model：
Major Function： 1. Compressed refrigerant: By the reciprocating motion of the piston in the cylinder, the refrigerant gas is compressed to increase its pressure and temperature<

2. Heat dissipation: During the compression process, the refrigerant releases a large amount of heat, which needs to be dissipated into the surrounding environment through the condenser or evaporator to maintain the stable operation of the refrigeration system<

3. Throttling and pressure reduction: The compressed high-temperature and high-pressure refrigerant gas enters the throttling device (such as a capillary), and due to the decrease in cross-sectional area, the gas velocity increases and the pressure drops, ultimately forming low-temperature and low-pressure wet steam<

4. Absorption process: Low temperature and low pressure wet steam enters the absorber, exchanges heat with water or other solutions, transfers the heat contained in it to the solution, and turns it into saturated steam or superheated water<

5. Regeneration process: Saturated steam or superheated water enters the evaporator and exchanges heat with the cooled medium, transferring its heat to the cooled medium and cooling it down. During this process, some moisture will be separated and returned to the refrigerant, completing a complete refrigeration cycle.

Details Parameter Usage Note

The four cylinder semi enclosed piston refrigeration compressor (15-30HP) in DMZL is a common refrigeration equipment that utilizes the reciprocating motion of the piston in the cylinder to compress refrigerant gas. This type of compressor has the advantages of simple structure, low cost, and easy maintenance, and is widely used in household air conditioning, commercial refrigeration, and other fields.

It has the following characteristics and advantages:

1、 Reliability

Mature technology, compact structure, small volume, and small space requirements

2、 All indicators meet the standards

High precision machining technology CNC center shell machining

Special process ensures excellent concentricity of three holes and dead center clearance machining technology

3、 Stability

Has good stability. The machine has low vibration and produces low noise

4、 Suitable for various working conditions

The use of working fluids such as R22 and R404 meets international environmental requirements and is suitable for low

temperature, medium and high temperature working conditions

5、 Electronic protection device

PTC temperature monitoring device effectively protects the motor

6、 Material selection

Chromium plated piston rings, aluminum piston hardening treatment, crankshaft low friction shaft sleeve

Using wear-resistant driving components, with a long service life

7、 Reasonable design

Efficient valve plate group design (large refrigeration capacity, low energy consumption) with efficient suction and exhaust

compression ratio.The valve plate is forged from Swedish imported steel strip (impact resistant)

8、 Universality

High universality of components, easy disassembly, repair, and maintenance

Related technical parameter table：

大明样本图册2023版AI版本_活塞4VD-G-15.2~30.2.png

1. Open box inspection: After receiving the equipment, first check whether the packaging is complete and whether the

components are complete. If there is any missing or damaged, please contact the supplier in a timely manner for replacement.

2. Installation and debugging: Install the compressor in the appropriate position according to the requirements of the

equipment manual, and ensure that the power cord is connected correctly and without errors. Then, necessary debugging

work is carried out according to the equipment requirements, such as adjusting the refrigerant filling amount, setting

operating parameters, etc.

3. Startup and operation: Turn on the power of the device and observe its operating status. After confirming the normal

operation of the equipment, the actual refrigeration operation can begin.

4. Monitoring and maintenance: During the operation of the equipment, attention should be paid to observing its operating

conditions, such as temperature, pressure, and other parameters. Once any abnormal situation is discovered, timely measures

should be taken to handle it. In addition, regular maintenance and upkeep should be carried out on the equipment to ensure

that it is always in good working condition.

5. Shutdown and shutdown: When the equipment no longer needs to run, please turn off the power first, and then follow the

requirements of the equipment manual to shut down. During the shutdown process, it is important to observe the status of

the equipment and ensure that it has completely stopped before proceeding to the next step of operation.

6. Storage and transportation: During the idle period of the equipment, please store it in a dry and well ventilated place,

avoiding direct sunlight and humid environments. During transportation, it is necessary to ensure the integrity of the equipment

packaging and avoid collision and compression.

For details, please pay attention to: official account of Zhejiang Daming Refrigeration Technology Co., Ltd., check the

[Operation Manual of Semi enclosed Piston Refrigeration Compressor -2019 General Version]

WARNING!

1.Oxygen pressure testing is strictly prohibited for the compressor unit, and nitrogen pressure testing without a safety valve is strictly prohibited. Improper use may cause explosions and casualties. The manufacturer shall not be responsible for any consequences caused by the above reasons.

2. When assembling the compressor unit and installing an oil separator, 1.5 to 2 liters of refrigeration oil (46 #) must be added to the oil separator. If the compressor freezes up due to insufficient oil due to not adding refrigeration oil, the manufacturer will not guarantee repair

3. The compressor is strictly prohibited from being compressed or vacuumed by the main engine. When using an oil pump lubricated compressor, an oil pressure protection device must be installed (the connection device of the oil pressure controller is shown in the diagram). If the compressor is damaged due to non compliant use, the manufacturer will not provide warranty.

4. It is strictly prohibited to use methanol to absorb moisture, in order to avoid damage to the motor.

5. All compressors must be equipped with electric heaters. When the compressor is restarted after a long-term shutdown, the crankcase heating function must be used, otherwise it will cause liquid shock and serious damage to the valve plate, connecting rod, and crankshaft.

6. The refrigerant must be filled into the system from the high-pressure valve (the system must be in a vacuum state). It is strictly prohibited to add excessive refrigerant from the suction valve during the operation of the compressor, otherwise it will cause compressor liquid shock, resulting in valve plate and valve plate fracture, connecting rod damage and locking, causing unnecessary damage to the user.

7. The cold storage system must be clean. If using pipelines, be sure to install an suction filter device on the suction valve. The refrigeration oil must be kept clean. If you find that the refrigeration oil is insufficient or dirty, please add and replace the refrigeration oil as soon as possible.

8. The installation of the wiring device must be securely fixed and then insulated with adhesive. During startup and debugging, it is necessary to check whether the exhaust valve has been opened. Do not open the suction valve too wide, slowly open it after operation.

Please read the user manual carefully before use, and follow the operating methods indicated in the manual. If the compressor is damaged due to improper use, the manufacturer will not provide warranty.