I. Appropriate control of oil quantity

Lubrication for refrigeration units typically involves two methods: (forced) circulating lubrication using oil pumps and splash lubrication. The loss of refrigeration unit oil primarily occurs in two aspects: one is the portion carried away by the refrigerant entering the cylinder, and the other is the loss due to lubricating the transmission mechanism and sealing components. To maintain the required oil quantity for the normal operation of the refrigeration unit, it is necessary to appropriately replenish the non-recoverable loss of refrigeration unit oil.

The primary factors leading to the deterioration of refrigerating oil:

1. Oxidative deterioration, characterized by a deepening oil color, increased viscosity, and elevated acidity levels, may even result in the formation of sediments.

2. The mixing of water and mechanical impurities can lead to ice blockage in the evaporation system (ammonia refrigeration units) or reduce refrigeration capacity, causing equipment corrosion, emulsification, and accelerating the deterioration of oil quality. Therefore, it is advisable to minimize storage temperature and seal containers to prevent the entry of water and impurities. Typically, the deterioration of oil can be detected by sampling and analyzing the refrigeration oil, with analysis items including viscosity, acidity, corrosion, color, moisture content, and flash point. If there is a significant change in any of these analysis items, it is necessary to replace the oil.