*Check whether the oil level is normal, and replenish the lubricating oil if necessary.

   *For water-cooled units, check the water cooler to ensure that the water circuit is smooth and free of leakage.

   *For centrifugal compressor, check the running current and adjust the maximum load set point if necessary to avoid the equipment running at maximum load for a long period of time, which may cause motor overload damage. 

  2. Operation after shutdown 

   *After the system is shut down from a high-temperature operating state, a large amount of condensate will be precipitated from the gas in the compression chamber, piping, and storage tank in a low-temperature environment. In order to prevent the condensate from freezing and blocking the system or even cracking the device, the condensate in the compression chamber, pipeline and storage tank should be discharged in time when the system temperature drops to the ambient temperature.

   *For water-cooled units, if there may be extremely low temperatures after shutdown, the residual cooling water in the compressor water cooler should be emptied, close the inlet and outlet water valves; if necessary, compressed air should be used to purge the emptying to avoid icing caused by the cooling pipe expansion cracks.