When is it essential to take measures to help release trapped CFC, HCFC, or HFC refrigerant from the compressor oil during refrigerant recovery? (A) A) When the refrigerant system has a low side leak. (B) B) When using passive recovery devices on small appliances with non-operating compressors. (C) C) When using self-contained recovery devices. (D) D) When using system-dependent active recovery devices.

It's particularly crucial to help release trapped refrigerants from the compressor oil when using self-contained recovery devices, as they rely on the pressure within the system to facilitate the recovery process. A trapped refrigerant can create a situation where the recovery device is unable to extract the remaining refrigerant effectively, leading to inefficiencies and potential environmental hazards. On the other hand, utilizing system-dependent active recovery devices is also important for ensuring proper recovery. These devices often depend on the system’s own pressure to aid in refrigerant extraction, meaning that trapped refrigerants must be adequately addressed to prevent overloading the recovery unit and to meet regulatory standards for safe refrigerant disposal.