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Users of industrial chillers have encountered various problems such as compressor shaft seizure and scoring, oil leakage, liquid slugging, surging, abnormal noises and vibrations, unresponsive alarm devices, unresponsive remote control signals from the control panel, forced shutdown of the motor even at low load, abnormal readings for suction and discharge pressures, garbled display messages, failure of slide valves/slide check valves to function, inability of the slide valves to open or close, fluctuations in oil pressure, cooling temperatures that do not meet requirements, abnormal suction and discharge temperatures, shaft seal leaks, wear of bearing rotors, high condensing pressure, compressor overheating, overload, and motor burnout. The aforementioned faults are common issues in industrial chillers. For experienced engineers, these faults are relatively easy to resolve, but customers and engineers with limited expertise lack the ability to fix them. Below, Gonglenghui analyzes the causes of these faults by examining the common high and low pressure alarms in industrial chillers, and proposes solutions in the hope of helping everyone gain more experience. I. Analysis of causes and solutions for high-pressure alarm faults 1. Frequent start-stop of the chiller: Frequent start-stop of the compressor may be caused by an insufficient oil level, which leads to an alarm. Solution: Top up the refrigerant oil and check if there is any oil leakage from the compressor. 2. Dirty and blocked refrigeration unit pipelines – Dirty or blocked pipelines in the refrigeration unit system can prevent cooling water or refrigerant oil from returning properly to the compressor, which in turn triggers an alarm. Solution: Clean the system pipelines; if necessary, contact Gonglenghui for assistance. 3. Low cooling water flow or it is not turned on. A low flow of cooling water in the chiller, or its failure to be turned on, can cause the compressor to shut down and restart frequently, triggering an alarm. Solution: Open the water valve; if the flow rate of the cooling water is still low, check whether the pipes are dirty or blocked. 4. Excessive refrigerant: An excessive amount of refrigerant in a chiller can lead to excessively high exhaust temperatures, and an alarm will be triggered to protect the operation of the compressor. Solution: Professional engineers should handle the refrigerant; it is not recommended for users to discharge it on their own. 5. Poor heat dissipation in the condenser: Poor heat dissipation in the chiller’s condenser can also cause an alarm indicating excessive exhaust pressure. Solution: Check and clean the dust on the surface of the condenser, and wash the copper tubes of the condenser. 6. Excessive opening degree of the expansion valve: An excessive opening degree of the expansion valve in a chiller leads to an increased refrigerant flow rate and a reduced superheat. Solution: Appropriately reduce the opening degree of the expansion valve, shut down the machine to check for the cause, and then restart it. You can also contact Gonglenghui for solutions. II. Analysis of the causes of low-pressure alarm faults and solutions 1. Insufficient refrigerant: A lack of refrigerant can cause a low-pressure alarm in the chiller; a severe shortage can lead to the unit shutting down as a form of protection. Solution: Check for leaks in the chiller, such as at the pipe connections, and replenish the refrigerant after identifying the cause. 2. Excessive water volume or fouling in the condenser: An excessive amount of water in the chiller’s condenser, or fouling there, can lead to excessively low water temperatures and poor heat dissipation. Solution: Reduce the water volume or use partial recirculated water to clean the copper tubes of the condenser. 3. Leakage in the suction and exhaust valve plates of the chiller: Leakage in these valve plates can lead to a leak of refrigerant gas, resulting in reduced exhaust volume and decreased cooling capacity. Solution: Have a professional engineer check the cause of the valve disc leakage and replace the valve disc. 4. Evaporator frosting: Frosting on the evaporator of a chiller can also lead to too low an intake pressure. Solution: Have a professional engineer check the cause of frosting and carry out defrosting. 5. A dirty evaporator filter can also cause low suction pressure in a chiller; a clogged evaporator filter leads to the same issue. Solution: Clean or replace the filter screen as appropriate. The above are the causes of high and low pressure faults in chillers, along with corresponding solutions, compiled by Gonglenghui. If you have any questions, feel free to send a private message to Gonglenghui for technical guidance or repair assistance. Shandong Gonglenghui Network Information Technology Co., Ltd. is a company that specializes in providing MRO services for industrial refrigeration equipment. With over 10 years of experience in the debugging, maintenance, and overhauling of such equipment, we possess the capabilities to carry out repairs, overhauls, and debugging tasks. The current service brands mainly include York, GEA (Grasso), Wuleng, Daleng, Yanceng, Carrier, Trane, and McQuay. The current \"Gonglenghui\" e-commerce platform, operating on a B2B+O2O model, can provide customers with over 100,000 types of accessories for the aforementioned refrigeration units. These include lubricants and filters for routine maintenance, sensors, valves, controllers, electrical components, heat exchangers, compressors, and control systems for repairs; as well as bearings, seals, shaft seals, rotors, slide valves, balance pistons, impellers, and other parts required for major overhauls. It also provides customers with comprehensive remote and on-site technical services. With the mission of \"creating more value for customers in the field of industrial refrigeration through an efficient supply chain and high-quality services,\" it aims to \"ensure customer satisfaction and deliver value to them\" as its enduring goal. “\"Gonglenghui\" is now offering high-value industrial refrigeration solution packages to customers across the country who use industrial refrigeration equipment. If necessary, search for Gonglenghui on Baidu.