How to debug the lubrication system of McQuay centrifugal chiller? Source: Beijing McQuay Air Conditioning Repair http://blog.tianya.cn/blogger/blog_main.asp?BlogID=3774629. The grade of lubricating oil for centrifugal refrigerators produced by different manufacturers is different, so it is necessary to read the product manual carefully. Now take the Shanghai-made FLI type centrifuge as an example: This machine uses No. 30 refrigerating machine oil, or other types of lubricating oil with similar specifications. The main technical indicators of No. 30 refrigerating machine oil are as follows: Kinematic viscosity (at 50℃) not less than 30 centistokes, Flash point (open) not less than 100℃, Pour point no more than -10℃, Water content: none, Impurities: no more than 0.007%. After injecting lubricating oil into the unit, run the oil pump in circulation for more than 8 hours, then dismantle and clean the oil filter, and release all the lubricating oil to replace it with new oil, and repeat the cleaning process until the lubricating oil system is confirmed to be clean. To ensure good lubrication of the compressor, the core of the system oil filter must be kept clean, which requires regular cleaning. When the machine is running normally, the oil temperature in the oil tank is generally maintained at (40~60)℃. The oil temperature shall not exceed 65℃, and the bearing temperature of the main engine shall not exceed 80℃. The regulation of oil temperature depends on the electric heater in the oil tank and the oil cooling coil to ensure the reduction of temperature. When the oil temperature is too low, the amount of R-11 dissolved in the lubricating oil increases, which is detrimental to lubrication. At this time, the water inlet valve of the oil cooling coil can be adjusted to reduce the amount of cooling water to increase the oil temperature. The electric heater in the oil tank is only put into use before starting the car or after parking, in order to raise the oil temperature and reduce the content of R-11 in the lubricating oil.