When recovering refrigerant from a medium-pressure system with more than 200 lbs. of refrigerant, recover to a level of?

Recovering refrigerant from a medium-pressure system requires an understanding of how to safely and effectively remove refrigerant to prevent any potential harm to the environment and comply with regulations. When the question specifies recovering to a level of 15 inches of mercury (Hg), it refers to the vacuum level that should be achieved during the recovery process.

Achieving a vacuum level of 15 inches of mercury indicates a thorough recovery, as this level is generally accepted as sufficient to ensure that the refrigerant is adequately removed from the system. This is particularly important for medium-pressure systems, which typically operate under higher pressure than low-pressure systems. By reaching 15 inches of mercury, you help ensure that the system is properly evacuated and that residual refrigerant doesn't remain, which could lead to environmental release if the system were to leak or be improperly disposed of.

Recovering to lesser vacuum levels, like 4 or 10 inches of mercury, wouldn't be sufficient to ensure complete removal of refrigerant, which could violate environmental protection standards. Therefore, the requirement to recover to 15 inches of Hg highlights the need for both effective recovery practices and compliance with legal guidelines governing the handling of refrigerants.