What must be done before opening a vapor/compression system for service?

The process of recovering refrigerant before opening a vapor/compression system for service is critical for several reasons. First and foremost, it is a regulatory requirement in many jurisdictions due to the environmental impact of refrigerants. Many of these substances are potent greenhouse gases, and releasing them into the atmosphere is not only harmful but also illegal in many regions.

Using approved recovery equipment ensures that the refrigerant is contained properly and transferred to an appropriate storage vessel, which is crucial for safe handling and future reuse or recycling. This practice protects both the technician and the environment while also abiding by industry standards and regulations.

Additionally, recovering refrigerant prior to servicing minimizes the risk of contamination in the system. If air, moisture, or other impurities get in during service, it can lead to complications and damage the system, creating more problems down the line. By ensuring the refrigerant is recovered, technicians can maintain system integrity and performance.

The other options would not fulfill the necessary requirements or protocols for servicing refrigeration systems safely and responsibly.