R11 or R123 system refrigerant recovery starts with?

In refrigerant recovery systems, especially when dealing with R11 or R123, the process typically begins with the removal of the liquid refrigerant. This method is generally preferred because liquid refrigerants can be pumped more efficiently than gases. Liquid removal ensures that the bulk of the refrigerant is recovered quickly and effectively before proceeding to manage any residual vapor.

Starting with liquid removal also helps minimize the potential for compressor damage that can occur if the system is only recovering vapor. When recovering refrigerant, ensuring the system's pressure and temperature are appropriate allows for optimal recovery operations, thereby maximizing efficiency and safety. This approach is especially effective in older refrigerants like R11 and R123, where handling and recovery practices may differ from modern refrigerants.

Exploring other options such as vapor removal or combinations of both may be relevant in specific scenarios, but the standard procedure begins with liquid recovery for the best efficiency and safety in the system.