What is meant by Self Contained (active) recovery equipment?

Self-contained (active) recovery equipment is specifically designed to utilize the equipment's own compressor for the recovery of refrigerants. This means that it has all the necessary components built into one unit, allowing it to effectively extract, compress, and store refrigerant without needing to rely on the system's existing components or external tools. This type of equipment can actively move refrigerant through the recovery process, making it efficient and effective for technicians working with HVAC systems.

The other options highlight various methods of refrigerant recovery that do not align with the concept of self-contained active recovery equipment. For instance, relying on the appliance’s existing components might involve using the system's built-in functions, which could be less efficient and doesn't capture the essence of being self-contained with independent operation. Similarly, utilizing external tools for refrigerant storage suggests additional equipment is needed, which contradicts the definition of self-contained. Employing passive methods for refrigerant removal focuses on techniques that do not actively engage equipment, thus differing from the active nature of the self-contained recovery process.