What should be done when all liquid has been recovered from a refrigeration system prior to an overhaul?

Waiting until all vapor has been recovered before opening the refrigeration system is essential for several reasons. First, allowing for the complete recovery of vapor ensures that the system is free from residual refrigerants. This is crucial for safety, as refrigerants can be harmful or toxic when inhaled or when they come into direct contact with skin. Additionally, this practice helps to prevent any potential pressure build-up that could occur if any vapors are left in the system, which could lead to hazardous conditions during the overhaul process.

Furthermore, the proper handling of refrigerants is also a key component of environmental safety and regulatory compliance. Ensuring that no vapor remains protects both personnel and the environment from harmful refrigerant emissions. Thus, following this procedure is crucial for maintaining a safe and effective work environment during the overhaul of refrigeration systems.