First, the product scope:
 Century Changlong air-cooled screw cold (hot) water unit is widely used in hotels, shopping malls, office buildings, exhibition halls, airports, gymnasium and other public facilities comfortable central air-conditioning system, and to meet the electronics, pharmaceutical, , Chemical, metallurgical, pharmaceutical, power, machinery and other industries of different air-conditioning system requirements.
Second, the product type and specifications:
① air-cooled screw cold (hot) water unit standard series of refrigerant products can be used R22, R410A, R134A, a total of more than 80 different varieties of specifications.
② single cooling capacity range of 96-814kW.
③ unit cooling operation can provide the temperature of 5-15 ℃ chilled water, the standard conditions: the water temperature of 7 degrees, return water temperature of 12 degrees.
④ optional: according to the user's special requirements, to provide auxiliary functional devices
Third, the product quality level:
1, the century Changlong air-cooled screw cold (hot) water unit design, production and sales in strict accordance with the ISO9001 quality assurance system to run to ensure product quality.
2, the century Changlong invested heavily in the construction of the international advanced level of the << air-cooled heat pump air conditioning laboratory >>, for air-cooled chillers, roof-type air conditioners, dehumidifiers, low temperature air conditioners, high temperature air conditioners and other units Design, development and test research and product testing. Strict factory product quality off, so that users buy rest assured that the use of the Heart.
3, the century Changlong air-cooled screw cold (hot) water unit products by the national air-conditioning quality testing center determination, the technical performance indicators are higher than the national standard, product quality and reliable, reliable operation, has been praised the majority of users at home and abroad , The market share year after year growth, has been in a leading position in the country.
Fourth, the main technical characteristics:
1, selected brand-name accessories, unit efficient, energy saving, durable:
① unit compressor, condensing fan, thermal expansion valve, hot gas bypass valve, heat transfer tube, control computer and other key components are selected well-known brand manufacturers of products to ensure that the unit efficient, energy saving and durable.
② unit insulation material for the flame retardant materials, to avoid human factors caused by fire accidents, to ensure the safe operation of the unit.
2, a complete unit control function, multiple safety protection measures to ensure the safe operation of the unit:
① unit has the control function:
 unit start and stop control
 remote, short-range control options
 unit program settings
 return water temperature control settings
 energy control automatic control
 high water temperature and low water temperature limit alarm
 anti-freeze protection settings
 compressor start and stop program management
Compressor manual management
 unit timing management
 pump management
Programmable temperature management
Full function parameter display
 fault alarm and diagnostic functions
② the unit has the security function:
Compressor phase sequence protection
 Compressor overload, overheat protection
 Condensation fan, motor set overheat protection
 system with high and low pressure protection device
 system with the necessary safety valve, release valve, sewage valve
 heat pump unit equipped with energy control valve to ensure that the unit low temperature operation safe and reliable
 electrical components with anti-shock protection
 antifreeze protection
 system with water protection
3, the unit control system intelligent, can provide centralized monitoring and remote monitoring interface:
① unit using microcomputer control touch control screen, Chinese display, user-friendly.
② high degree of automation, full-featured, to achieve the unit start and stop program management, timing control, water pump management, full-function fault alarm and fault self-diagnosis function. At the same time optional RS485 / RS232 communication interface, user-friendly unit to achieve centralized monitoring and remote monitoring.
③ use three password protection, to prevent the program and set parameters are free to change.
① When the unit fails, immediately stop the operation automatically, the alarm output fault signal and display the cause of the fault and where the fault, in order to facilitate the troubleshooting and maintenance of the unit.
② motor start and stop by the computer control, and with the compressor, condensing fan interlock control; compressor by the computer control, for the valve and compressor synchronous action.
4, refrigeration system multi-loop design, improve the unit's reliability and anti-jamming capability
The series of units such as the use of two or more than two compressors, according to each compressor for a refrigeration circuit design. Each compressor is a backup between each other, thereby improving the unit's reliability and anti-jamming capability.
5, relying on advanced performance testing equipment to ensure that the unit performance and stability, safe and reliable operation:
Shandong Century Changlong New Energy Co., Ltd. has advanced laboratories, each air conditioner are in the factory for rigorous operation test to ensure that the crew in harsh conditions safe and reliable operation, the factory products are qualified products.
Five, the century Changlong air-cooled screw cold (hot) water unit structural features:
1, matching brand-name quality, efficient compressor, to ensure that the unit energy efficiency ratio:
 unit using semi-closed twin screw screw compressor, compared with the piston compressor, semi-closed screw compressor has the following advantages:
① less operating parts (about 1/3 of the piston compressor), simple structure, less wearing parts, high reliability, long life;
② compressor suction exhaust evenly continuous, small vibration, not sensitive to wet compression, anti-liquid strike ability;
③ energy regulation, the screw compressor is more advantages, through the slide valve on demand can be automatically between 25 ~ 100% energy adjustment; section adjustment, stepless adjustment can be achieved.
2, matching high-performance finned air-cooled condenser:
① In order to fit the air dust, dust and more of China's national conditions, air-cooled condenser with a unique fin shape and structure, strengthen the flat-chip aluminum fins by the import of special processing equipment made of the overall stamping, Thermal effect is significantly improved at the same time, the surface is not easy to fouling, but also easy to clean, to prevent germs in the fins on the breeding, to ensure good heat exchanger heat transfer capacity.
② heat exchanger aluminum fin surface through special treatment to improve the fin corrosion resistance, so that the durability of the heat exchanger greatly improved.
③ air-cooled condenser with brass sets of aluminum fin structure, the aluminum fins, heat transfer tubes are imported materials, anti-dirt, corrosion resistance. Copper tube, corrugated aluminum fins made by the mechanical expansion of the tube, so that the combination of close, high heat transfer efficiency, heat transfer coefficient; heat exchanger tube plate support plate are made of high quality stainless steel plate. Corrosion resistance, durable High degree.
④ Condenser processing process using advanced cleaning technology to improve the surface cleanliness of the heat exchanger, thus ensuring the efficient heat exchanger heat transfer capacity.
⑤ using a unique heat exchanger cooling process, a reasonable match the amount of wind and the wind speed to ensure that the cooling process and the balance of the cooling side of the wind side, give full play to the compressor cooling capacity and heat exchanger heat transfer capacity, so that the unit efficient Energy saving.
⑥ condenser with a unique "inverted M" type layout, compact structure, small footprint, uniform wind, to overcome the condenser air short circuit phenomenon, give full play to the condenser heat transfer capacity.
3, matching high-performance heat transfer tube dry shell and tube evaporator:
① using the most advanced DAE efficient evaporative heat transfer tube, the tube surface of the long spiral ribs and spiral protrusion, the heat transfer coefficient and heat transfer capacity greatly improved.
(2) The internal structure of the evaporator is designed with fluid optimization, and the efficient homogenizer is arranged to solve the problem of homogeneity of the refrigerant distribution. The heat transfer efficiency is 5% higher than that of the conventional heat exchanger.
③ improve the sealing structure of the refrigerant water baffle, to solve the baffle leakage and other issues, greatly improving the evaporator heat transfer efficiency, while reducing the water process resistance, thus ensuring the unit to achieve a higher level of performance;
④ the use of a unique heat exchanger refrigeration process design technology, a reasonable system matching to ensure that the cooling process and the water side of the balance of the balance, give full play to the high efficiency of the heat exchanger; and reasonable system matching, the unit more energy efficient.
⑤ In the dry evaporator also installed antifreeze protection switch, drain valve, etc., to ensure the safety of dry evaporator and cleaning, maintenance convenience.
4, matching efficient, low noise fan:
① use of airfoils, large twist angle twisted dedicated fan, high mechanical efficiency, vibration, low noise, no fault, long operating life.
② motor corrosion resistance, long life; machine through a rigorous dynamic and static balance test, high efficiency, vibration, low noise.
5, unit vibration design, to ensure that the unit low noise, low vibration:
⑤ The bottom of the unit compressor is set with spring or rubber damper, the vibration reduction efficiency is above 85%, that is, the vibration transmission rate is less than 0.15, reduce the unit vibration and system vibration, thus reduce the unit noise.
⑥ unit system All pipes are shielded plastic pipe clamp fixed, to avoid the unit and the system vibration, and the noise generated.
6, matching brand refrigeration system accessories:
(1) All the refrigeration system accessories used in the unit are made of brand-name products such as removable dry filter, external balance thermal expansion valve, liquid supply solenoid valve, liquid mirror, high and low pressure controller, exhaust temperature controller Are using world-class brand-name manufacturers of products to ensure that the unit has a high level of performance.
② all the equipment by the 100% inspection before passing into the factory, to ensure that the unit refrigeration system work high reliability.
7, matching advanced, highly reliable intelligent control system and control technology:
① multi-machine control system in addition to stand-alone automation configuration and function, but also with multi-unit operation shows, according to the return temperature of the computer automatically determine the air conditioning system is part of the unit operation or all units running, and optional RS485 / RS232 communication interface, User-friendly centralized control.
② unit has a multi-compressor control of the balanced operation function to ensure efficient operation of the unit.
8, the unit energy regulation:
The unit according to the chilled water return water temperature logic calculation, control the operation of the unit and start and stop. Each unit uses four energy regulation, to achieve efficient operation of the unit.
 9, the unit structure is reasonable, the unit has a good corrosion resistance
① unit frame structure, compact, solid, with good mechanical strength, small size, small footprint, uniform wind, no air short circuit phenomenon.
② the outer surface of the unit using spray treatment, anti-corrosion rust, smooth surface, neat, smooth, beautiful appearance.
③ the use of modular design, product adaptability, parts interchangeability, flexibility to carry out a variety of models to the most efficient way to provide users with the most thoughtful service.
④ unit layout is reasonable, according to ergonomic, optimized installation and maintenance space, to facilitate daily cleaning, maintenance and repair.
10, installation and commissioning, maintenance and management convenient:
① unit to machine in the form of the factory, low-voltage part of the factory before the package insulation layer, the system has been filling the fuel, arrived at the scene only after the water pipe connection. Turn on the unit and turn on the unit.
② The computer will automatically start the pump motor, compressor and condensing fan according to the program, and the unit of the refrigeration, heating, delay, interlock, protection and temperature adjustment and other automatic control.
⑦ unit under the control of the computer set by the temperature, and according to the evaporator water temperature changes automatically cooling, heating energy regulation.
Unit installation flexibility, both on-site control can also be remote control, the compressor, refrigeration accessories and electronic control systems are placed in the lower part of the unit for the open structure, easy to check and maintain.