Which type of recovery requires the assistance of appliance components to remove refrigerant?

The correct choice identifies system-dependent recovery as the method that relies on appliance components to facilitate the removal of refrigerant. In this type of recovery, the refrigerant is extracted using the existing components in the refrigeration system, such as the compressor, to assist in the process. This method is effective because it utilizes the inherent system mechanics, making the recovery process more efficient without needing external recovery equipment.

In system-dependent recovery, the appliance itself acts as both the source of refrigerant and the means for evacuation. It is typically used in systems that have a functioning compressor, which creates the necessary pressure differential to draw the refrigerant out of the system.

Understanding this method is critical because it highlights the reliance on the operational components of the refrigeration system, ensuring that technicians can extract refrigerant safely and in accordance with EPA regulations. This method is applicable for specific situations where the appliance is operational, which emphasizes the importance of recognizing the condition of the equipment prior to proceeding with recovery.

The other recovery types either do not utilize appliance components directly or are aimed at different recovery processes, which is why they do not fit the description provided in the question.