What type of recovery equipment relies on the compressor in the appliance or the refrigerant pressure?

The correct choice, system dependent recovery equipment, operates by utilizing the compressor of the appliance or the refrigerant's pressure to facilitate the recovery of refrigerants. This type of equipment relies on existing system components for the recovery process, meaning that it efficiently depends on the performance of the appliance's own compressor to remove refrigerants from the system.

Because it leverages the pressure inherent in the refrigerant system, it can be particularly effective when dealing with systems that have a sufficient amount of refrigerant and pressure available. This makes system dependent recovery units straightforward to use in situations where the appliance is still operational, as the built-in components do most of the work.

In contrast, other types of recovery equipment, like self-contained units, operate independently and have their own compressors and mechanisms to recover refrigerants without relying on the existing system pressure or components. Thus, understanding the distinction is important for recognizing how each type of recovery equipment functions within a refrigeration or air conditioning system.