Where is oiling required on a centrifugal refrigeration system?

In a centrifugal refrigeration system, oiling is primarily required at the shaft end bearings. The bearings support the rotating shaft of the compressor and are crucial for its effective operation. Proper lubrication at these bearings reduces friction and wear, ensuring smooth rotation and longevity of the compressor components. Insufficient oil can lead to overheating, increased wear, and ultimately, potential failure of the compressor.

While other components like the compressor outlet, condenser coil, and evaporator inlet have their own maintenance needs, they do not require oiling in the same manner as the bearings. The compressor outlet primarily deals with refrigerant flow, the condenser coil is focused on heat exchange, and the evaporator inlet is part of the system's overall refrigerant cycle, none of which necessitates direct lubrication like the bearings do.