Why is it essential to recover all vapor before overhauling a refrigeration system?

Recovering all vapor before overhauling a refrigeration system is crucial primarily to ensure complete refrigerant recovery. This process is necessary for several reasons. First, refrigerant can be harmful to the environment, and complete recovery helps to minimize any potential leaks or emissions that could occur during system maintenance. Additionally, incomplete refrigerant recovery can lead to noncompliance with safety regulations and environmental laws.

By ensuring that all refrigerant vapor is recovered, technicians can also prevent issues related to mixed refrigerants if any residual refrigerant remains in the system. Proper recovery practices help maintain the integrity and functionality of the system during repairs or maintenance.

While air contamination, compressor damage, and system pressure are important considerations in the context of refrigeration systems, the primary and most relevant reason for complete vapor recovery during an overhaul is to facilitate proper refrigerant management.