What should be done before recovering refrigerant from a system with a burned-out compressor?

The concept behind this question

Recovery technique depends on the appliance and how much refrigerant it holds. The practical distinction is between system-dependent (passive) recovery, which relies on the appliance's own compressor or pressure and is limited to small appliances, and self-contained (active) recovery, which uses a powered recovery machine and is required for larger equipment. Recovery equipment must be certified to the applicable standard, and required evacuation levels vary with appliance size and type.