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The Lunar New Year is approaching, and there are several points to keep in mind regarding the shutdown of air compressors before and after the holiday, as well as their restart after the holiday. I. Precautions for shutdown: 1. When shutting down the air compressor, it is necessary to completely drain all the water from the oil cooler, the after-cooler, and the internal pipelines, to prevent the coolers and internal pipelines from cracking and being damaged due to low temperatures. 2. Drain the condensate from the pressure storage tank and drain valves; for water-cooled units, it is essential to remove any excess cooling water from the cooling system pipes to prevent the pipes from cracking due to low temperatures in winter. 3. Before shutting down the air compressor, record its operating data to ensure that the data is normal when it is started up again. 4. Before shutting down the air compressor, any faults should be repaired before it is turned off, to ensure that the machine can operate properly in case of an emergency. 5. Cut off the power supply, perform an emergency stop of the equipment, close the gas valves, and install warning devices. 6. If there are grade 0 oil-free purification devices based on catalytic oxidation, the power supply must be cut off after other purification devices have been shut down. II. Precautions for turning the machine on after a long period of shutdown: 1. Check whether the machine’s wiring is in good condition, verify that the oil level is at the proper level, and ensure that all condensate drainage outlets are closed. 2. For water-cooled units, activate the cooling water circulation system, check whether the cooling water discharge outlet is closed, and test whether the circulation system is operating properly. 3. After powering off the equipment, manually rotate the main engine coupling; it should turn smoothly. If it is difficult to rotate the engine, do not start it blindly. Check whether there are any faults with the engine or motor, as well as whether the lubricant has become thick or ineffective. The equipment can only be started after these issues have been resolved. 4. Before starting the air compressor, ensure that the oil temperature is not lower than +2°C; if the temperature is too low, use a heating device to warm the oil tank and the main unit. 5. For machines that have been shut down for an extended period of time or whose oil filters have been in use for a long time, it is recommended to replace the oil filter before restarting them. This prevents insufficient oil supply to the engine due to the reduced capacity of the oil filter to filter the oil when it is thick, which can cause the engine to overheat immediately upon startup and lead to engine failure. 6. If a machine with heat recovery is already installed, close the oil circuit valve of the heat recovery system; once the unit is operating properly, slowly open the oil circuit control valve of the heat recovery system. 7. After completing the above inspections, the machine should be started for the first time in jog mode to check its operating conditions as well as whether the sounds produced during startup are normal. In the event of a sudden temperature change, stop the machine immediately for inspection; do not start it frequently. Special note: When restarting an air compressor after a long period of shutdown, never press the start button directly – this can easily lead to a lack of oil and resulting jamming of the machine. It is essential to use the jog function to start it! Remember: To use the jog function: 1. Press the start button; after the machine has run for about 5 seconds, press the emergency stop button. Wait for about half a minute (for permanent magnet variable-frequency compressors, the emergency stop button can be pressed after the preset running time has elapsed). Repeat this process at least 2 times before starting the machine normally. 2. If it is observed that the temperature rises rapidly along with unusual noises at startup, this is due to the internal engine oil not yet having circulated; it is necessary to immediately press the emergency stop button, then restart the machine several times. 3. After the machine starts up properly, check the operating data; normal air supply can begin only once the air compressor is running correctly.