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A screw-type chiller is named so because its key component – the compressor – is of the screw type; the unit consists of the gaseous refrigerant that comes out of the evaporator； After adiabatic compression by the compressor, it becomes in a high-temperature and high-pressure state. The compressed gaseous refrigerant is cooled and condensed at constant pressure in the condenser; after condensation, it turns into a liquid refrigerant. It is then expanded to low pressure through a throttle valve, resulting in a gas-liquid mixture. In this process, the liquid refrigerant at low temperature and pressure absorbs heat from the substance to be cooled in the evaporator, returning to a gaseous state. The gaseous refrigerant returns to the compressor through pipes, starting a new cycle. The service life and operational performance of screw chillers depend to a large extent on the maintenance they receive. To ensure the service life of screw chillers, as well as to control cleaning and maintenance costs, it is necessary to thoroughly clean the chillers by removing all debris and cleaning the ceiling-mounted fans as well as the interior of the chillers. 1. When cleaning, it is important to protect the motor from water splashes, as this can cause damage to the motor. The power to the fan should be cut off before cleaning. 2. The surface of the refrigeration unit should be cleaned using a gentle cleaner and warm water to maintain its smoothness; never use cleaners containing abrasive particles or rubbing pads for cleaning. 3. Inner surface of screw-type chillers: The inner surface can be cleaned using household cleaners, amino-based cleaners, and disinfectant solutions; this will not damage the surface. Abrasive cleaners and scrubbing pads must not be used as they can damage the surface. Water must not be splashed on electrical components, and solvents, oils, or acidic cleaners are not permitted. 4. Replace the light bulb: When replacing the light bulb, first turn off the power supply, then remove the lamp shade to replace the bulb. After replacing the bulb, reinstall the lamp shade making sure it is airtight. By carrying out the above maintenance tasks, it is believed that the occurrence of failures will be reduced during the use of screw chillers.