Maintenance of York screw compressors and analysis of faults related to excessively high or low output pressure!

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In the field of industrial refrigeration, screw compressors have held a dominant position in refrigeration systems due to their high operating efficiency, large cooling capacity, long durability, and simple structure. Of course, their maintenance also constitutes the largest part of the operational costs. For example, thanks to their excellent performance, York screw compressors hold a significant market share in China. Services such as repair, maintenance, and overhauls after the machines are purchased constitute York’s main source of revenue; in fact, the costs associated with repairs can be higher than the cost of purchasing the machines themselves, which poses a serious problem for many companies. So how can we reduce failures in York screw compressors and ensure their efficient and stable operation? (For the York TDSH233L model screw compressor) To reduce failures in screw compressor units, it is first necessary to know what the common failure types of such units are 1. The compressor is not loaded. 2. The compressor output pressure is too high or too low. 3. Compressor overheating. 4. The slide valve cannot be loaded or unloaded. After identifying the common faults in screw compressors, there are also some hidden faults that require specific solutions depending on the particular circumstances. Faced with so many failures, to effectively prevent them from occurring, wise people choose to carry out maintenance! How to maintain it? The oil filter should be replaced promptly when the oil pressure drops by 30% or after six months of use; the lubricating oil should be changed annually. The installation bolts of the compressor unit should be checked regularly to ensure they are tight, and the condenser and evaporator should be maintained on a regular basis to keep their interior and exterior clean. Finally, by investing 20% of the maintenance costs, businesses can save 80% on major repair expenses. Proper maintenance can ensure that the machine operates more efficiently and reduce the incidence of failures; otherwise, issues such as \"excessively high or low output pressure\" in the aforementioned compressor units may occur. Of course, when problems arise, Gonglenghui will help identify the causes: 1. What causes the low output pressure of a compressor unit? 1. Insufficient or leaking refrigerant. 2. Insufficient flow rate of the refrigerant water results in less heat absorption; this leads to poor evaporation of the refrigerant. Moreover, subcooled and supersaturated steam can cause wet compression, manifested as a decrease in the pressure difference between the inlet and outlet fluids of the unit, an increase in the temperature difference, a drop in the suction temperature, and frosting at the suction port. 3. Scaling or blockage of the evaporator leads to poor heat exchange efficiency, resulting in a reduced amount of refrigerant evaporation. The exhaust temperature of the unit drops, but the difference between the temperature of the chilled water outlet and the temperature of the refrigerant in the evaporator is higher than normal. The pressure difference between the inlet and outlet water increases, and sweating or frosting may occur at the suction port as well. When this occurs, the heat exchange tubes on the water side of the evaporator should be cleaned regularly. 4. Electrical faults cause false alarms. False alarms caused by communication faults such as moisture-induced short circuits or poor contacts in the low-voltage protection relay, damage to the relay, or moisture damage or failure of the unit’s electronic board. II. What causes the high output pressure of the compressor unit? 1. The cooling water temperature is too high, resulting in poor condensation efficiency. 2. The circulating water flow rate is insufficient, failing to reach the rated flow rate. 3. The condenser is contaminated or clogged. 4. Excessive refrigerant charge. 5. The refrigerant contains gas. 6. False alarms caused by electrical faults. The above covers the common faults and causes of excessively high or low exhaust pressure in screw compressor units. For engineers with limited practical experience, Gonglenghui does not recommend disassembling the units to avoid significant losses. Engineers who need parts for York screw compressors can consult Gonglenghui, which can help them find cost-effective original replacement parts quickly. Shandong Gonglenghui Network Information Technology Co., Ltd. is an industrial Internet company whose vision is to create a one-stop MRO service platform for industrial refrigeration, thereby becoming a trusted partner for its customers. Its e-commerce platform, “Gonglenghui”, operates on a B2B+O2O model to supply customers with lubricants and filters for daily maintenance, as well as sensors, valves, controllers, electrical components, heat exchangers, compressors, and control centers for repairs. It also provides parts such as bearings, seals, shaft seals, rotors, slide valves, balance pistons, and impellers for major overhauls. The platform offers comprehensive remote and on-site technical support. With the mission of \"creating more value for customers through an efficient supply chain and high-quality services in the field of industrial refrigeration,\" it aims to ensure customer satisfaction and deliver value to them at all times. The brands that our company primarily serves at present include York, GEA (Grasso), Wuleng, Daleng, Yanceng, as well as units from Carrier, Trane, McQuay, etc. We have engineers with high technical skills who are capable of carrying out repairs on these units, making system adjustments, and handling electrical control tasks in an efficient and high-quality manner, thereby creating new achievements through a sincere attitude.