What potential issue arises from charging liquid refrigerant into a deep vacuum?

Charging liquid refrigerant into a deep vacuum can lead to the freezing of water in the chiller tubes. When liquid refrigerant is introduced into an environment with a deep vacuum, the pressure drops significantly, causing the refrigerant to evaporate rapidly. If there is any moisture present in the system, particularly water, the rapid drop in pressure can lead to its freezing. This ice formation can obstruct the flow within the chiller tubes, leading to inefficient operation and potential damage to parts of the system.

This scenario emphasizes the importance of ensuring that the system is properly dehydrated and free from moisture before charging with refrigerant. Avoiding moisture in the system is critical to maintaining the functionality and longevity of the equipment.