Twin screw compressor of international famous brand is selected, with 5:6 tooth type screw rotor; the rotor is made of high heat resistant alloy steel with carburized and laser hardened surface, without thermal deformation; the rotor is designed with clearance compression method and oil film sealing technology to reduce wear and vibration. The male rotor end adopts a-type balance drum, which uses the principle of elastic damping to balance the slight vibration of the rotor, avoid rigid impact, reduce wear, protect the rotor and bearing, and prolong the service life of the compressor. In addition, the number of SKF zero-clearance oil storage bearings in Sweden is increased from 9 to 11, which limits the radial vibration and prolongs the service life.
 

Both the evaporator and the condenser are made of special high-efficiency heat exchange tubes, which have the advantages of compact structure, small volume, high efficiency, small system resistance, high heat transfer coefficient, stable and reliable oil return, etc.
 

The unit adopts bilateral enhanced heat exchange tubes and special heat exchange surfaces designed for different heat transfer mechanisms and fluid media with advanced technology, so as to achieve better heat transfer efficiency, reduce pressure loss along the way and reduce energy consumption of users.
 

In order to protect the ozone layer and reduce the greenhouse effect of the atmosphere, R134a environmental protection refrigerant can be selected. The ozone depletion potential value is 0. It is safe, non-toxic, non-flammable, green and environmentally friendly, and adapts to the current international environmental protection development trend.
 

The unit adopts the world's advanced electronic expansion valve, which has higher control accuracy under full load or partial load. Compared with the throttling mode of fixed orifice plate parallel expansion valve, the regulating range is wider and the response is faster. The heat exchange area of that evaporator can be fully utilize under any work condition, the heat exchange is more sufficient, and the efficiency is higher.
 

The refrigeration load is detected in real time according to the change of chilled water temperature, the capacity of the compressor can be adjusted steplessly to adapt to the change of real-time load, the partial load efficiency is high, and the fluctuation range of water temperature is only ± 0.5 ℃.
 

The industrial controller is used to monitor and analyze various operating parameters of the unit in real time.

The system is equipped with a full Chinese display, with a friendly interface and convenient operation;

It has RS-485 and RS-232 physical interfaces, which can not only realize the networking group control of multiple hosts, but also communicate with intelligent devices with open communication protocols, and has the functions of remote communication;

Multi-level password protection function.
 

 • Power supply protection: power supply phase loss, reverse phase protection, overvoltage protection and undervoltage protection

 • Compressor protection: prevent motor overheating, overload, frequent starting, oil level protection, high exhaust temperature protection;

 • Pressure protection: the condenser is equipped with a safety valve for protection against too low low pressure, too high high pressure and low suction and exhaust pressure difference;

 • Other protections: low water temperature protection, low water flow protection, sensor failure, etc.
 

Optional unit cloud control technology, reliable guarantee of energy saving, money saving and modernization in the process of system operation and management, with functions of remote network control, system energy-saving operation, cold and heat metering, power consumption statistics, remote fault alarm, remote parameter display and setting, real-time picture display, remote start-stop equipment, etc. It can strengthen the energy-saving operation management of the whole central air-conditioning system from the control of each air-conditioning area of the building.