What differentiates "system-dependent" and "self-contained" recovery devices in refrigeration systems?

Question

Accepted Answer

self-contained recovery devices usually contain a compressor, system-dependent recovery devices do not

Answer

the system compressor must be working to use system-dependent devices, the system compressor may or may not be operational when self-contained devices are used

Answer

self-contained recovery devices can only be used on large CFC and HCFC units

Answer

there is no difference between the devices

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