When should the liquid level be closely monitored in a refrigeration system?

Monitoring the liquid level in a refrigeration system is crucial during normal operation. This is when the system is running and actively circulating refrigerant, making it essential to ensure that the liquid level remains within the appropriate range for efficient operation.

In normal conditions, maintaining the correct liquid level helps prevent issues such as compressor overheating, liquid slugging, and system inefficiencies. If the liquid level is too low, it can result in the compressor drawing in vapor only, leading to inadequate cooling. Conversely, if the level is too high, it can cause liquid refrigerant to enter the compressor, which can lead to damage. Therefore, regular monitoring of the liquid level ensures optimal performance and longevity of the refrigeration system.

While liquid levels should also be checked during maintenance checks and under specific conditions like low ambient temperatures or while the system is idling, the consistent operational state presents the highest need for monitoring to prevent immediate problems that can arise from incorrect liquid levels.