Centrifugal and Screw Chiller Maintenance for Central Air Conditioning Systems

     Central air conditioning and household air conditioning have significant differences. Household air conditioning is relatively simple, while central air conditioning is a systematic project. It includes compressors (centrifugal, screw, piston, scroll, etc.), condensers (water-cooled or air-cooled), throttling devices, evaporators, refrigeration oil devices, cooling water systems, chilled water systems, water pumps, cooling towers, terminal coil fans, air handling units, etc., as well as air supply, return air, fresh air systems, power supply and distribution, control circuits, and more.
Hotels, hospitals, office buildings, factories, leisure and entertainment venues, etc., generally use models such as water-cooled chillers (boiler heating), air-cooled heat pump chilled/hot water units, or lithium bromide absorption units. For a central air conditioning project to be effective and energy-efficient, the choice of the main unit brand is crucial. Additionally, the design and installation of the central air conditioning system are equally important. It is essential to hire professionals or construction teams, as many projects suffer from quality issues and poor air conditioning performance due to unreasonable design and non-standard construction. Regular maintenance of the central air conditioning system is particularly important. Some organizations do not pay much attention when the units are not broken. Once a fault causes the entire central air conditioning system to malfunction, it will result in significant losses and impacts. Regular maintenance can eliminate faults, reduce accidents, lower operating costs, extend the equipment's service life, and ensure normal work schedules. Central air conditioning equipment and system maintenance is a highly specialized industry. Practitioners must possess HVAC technology, air conditioning refrigeration principles, electronic circuit principles, and water and electrical installation and repair qualifications, as well as extensive work experience as all-around technicians. This ensures that your central air conditioning operates efficiently, energy-efficiently, and normally. Hiring unprofessional and unqualified "guerrilla teams" for repairs or maintenance will not only fail to ensure repair quality but may also expand faults and cause serious consequences. Hengyang City Chuanghui Air Conditioning Equipment Engineering Department is a professional technical service department with complete qualifications and licenses. Since 1988, we have long cooperated with large air conditioning and refrigeration companies in Hong Kong and Guangdong (national first-class enterprises), engaging in the installation, construction, repair, and maintenance of central air conditioning equipment. Through continuous learning and research, we have accumulated rich work experience and strong professional skills. Over the years, we have established good cooperative relationships with international and domestic central air conditioning equipment manufacturers, such as Carrier, York, McQuay, Trane, Hitachi, DunAn, Kingair, Gree, Haier, Tsinghua Tongfang, etc., and will provide genuine spare parts to customers at preferential prices. With comprehensive central air conditioning technology, complete specialized tools for central air conditioning testing and maintenance, and a service philosophy based on integrity and customer first, we provide fast and scientific professional services. For central air conditioning repair and maintenance, find the most professional! We welcome technical exchanges with peers and enthusiastically provide relevant technical consultations.
The necessity of central air conditioning maintenance:
How to ensure that central air conditioning equipment effectively performs its air conditioning function, operating efficiently, safely, and energy-efficiently, daily maintenance is very important. Regular maintenance can eliminate faults, reduce failures, lower operating costs, extend the equipment's service life, and ensure normal work schedules.
After the system has been running for a period, compressor vibrations can cause pipe joint loosening or weld cracking, leading to refrigerant and refrigeration oil leakage. Minor leaks may cause reduced cooling efficiency and low-pressure alarms. In severe cases, the compressor may not receive adequate cooling and lubrication, resulting in overheating, scoring, and burnout.
After the initial break-in period, due to mutual wear between mechanical moving parts, wear debris will deposit in the lubricating oil, reducing its lubricating effect. Long-term use will exacerbate wear or scoring of moving parts, eventually leading to compressor burnout.
After the air system has been running for a period, dust will accumulate on the filter screen, increasing air resistance and causing reduced air volume or blockage. Reduced air volume will affect the performance of fan coil units, while complete blockage will render them ineffective, impacting normal use. Especially for air handling units, variable air volume, and combined air conditioners, this can easily lead to motor burnout.
Since the cooling water system is an open system, cooling water fully contacts air through the cooling tower. While being cooled, it also introduces a large amount of dust and other impurities into the water system, which deposit in the cooling tower, air conditioning units, and pipes, forming sludge and reducing circulating water volume, affecting heat exchange.

After the chilled water system is put into use, impurities such as welding slag, iron filings, mud, and oil left during installation will accumulate in the system. Hard substances like welding slag and iron filings will adhere to the heat exchange equipment surface, affecting heat exchange.

Since cooling water contacts air, algae, bacteria, and other microorganisms will grow in the cooling tower and pipes. Their dead bodies, combined with sludge, oil, and other debris, adhere to equipment and pipes, affecting circulating water volume and heat exchange. Meanwhile, the formation of microorganisms and deposits promotes the formation of concentration cell corrosion and under-deposit corrosion, accelerating metal corrosion. Chilled water systems, often using tap water exchanged through water tanks, will also produce the above phenomena.
Long-term operation of central air conditioning equipment can cause wire and component aging due to heating, leading to loose or detached connections, poor contact, and phase loss. AC contactors and thermal relays may also experience poor contact, open circuits, and other faults.

If the above faults are not eliminated in time, they can cause compressor phase loss or three-phase current imbalance, leading to burnout.

Malfunctions of protection devices such as flow switches, high and low-pressure switches, and safety valves can also cause accidents, resulting in significant losses and impacts....;

Our company is a professional large-scale central air conditioning technical service company with complete licenses and comprehensive technology. We long-term cooperate with international and domestic large air conditioning and refrigeration equipment manufacturers to provide customers with high-quality genuine spare parts. With preferential prices and fast service, we solve any faults and technical problems in your central air conditioning system, ensuring efficient and energy-saving operation. Your satisfaction is our service purpose.