For screw chillers the water-cooled shell-and-tube condenser uses open-loop circulation for its chilled water. In most cases, tap water circulates through the cooling tower. However, when the water contains high levels of calcium and magnesium salts, it can easily dissolve and precipitate as scale deposits on the inner surface of the chilled water pipes, affecting heat transfer efficiency. Excessive scaling can reduce the flow area of the chilled water, leading to decreased water flow and increased refrigerant pressure. Therefore, when poor-quality chilled water is used, it is essential to clean the chilled water pipes at least once a year to remove scale deposits and other impurities.

The drying filter device is a critical component to ensure the proper circulation of refrigerant. Since water and refrigerant do not mix, any presence of water within the system significantly impacts the operational efficiency of the refrigeration unit. Therefore, maintaining internal dryness is crucial. The filter element inside the drying filter device must be replaced regularly.

Both the condenser and evaporator in screw chillers are considered pressure vessel equipment. According to regulations, a safety valve must be installed at the high-pressure end of the chiller, specifically on the condenser body. In case of abnormal operating conditions, the safety valve can relieve pressure automatically, preventing harm from excessive pressure. Regular inspection and maintenance of the safety valve are essential for the overall safety of the chiller unit.

After prolonged use, the lubricating oil in the chiller unit deteriorates, accumulating impurities and water content. Therefore, regular oil sampling and analysis are necessary. If any issues are detected, immediate oil replacement is crucial, ensuring that the lubricating oil type aligns with technical specifications.