What type of refrigerant recovery method is used in the system-dependent process?

• A. Vacuum method
• B. High-pressure method
• C. Low-pressure method
• D. Passive recovery

Answer: (D)

The system-dependent process employs passive recovery as its refrigerant recovery method. In this process, the recovery relies on the operation of the refrigerant system itself, allowing the refrigerant to flow naturally from the system into the recovery cylinder without the need for mechanical assistance such as pumps or compressors.

Passive recovery is typically utilized in systems that have sufficient pressure to allow refrigerant to be displaced or driven out, often simply by closing service valves and allowing the system to equalize. This method is generally favored for its simplicity and minimal equipment requirements, making it effective in many conventional HVAC and refrigeration systems where the refrigerant can be recovered by simply using the existing pressure in the system.

Other recovery methods mentioned, like vacuum, high-pressure, and low-pressure methods, involve more active forms of refrigerant recovery that require additional pumps or vacuum systems to facilitate the transfer of refrigerant, which is not a characteristic of the system-dependent process.