🔍 Key Concepts

• Safe practices for working with refrigerants in enclosed spaces • How to locate a large, suspected leak versus pinpointing a tiny one • Basic differences between vacuum tests, hydrostatic tests, electronic detectors, and soap-bubble checks

💭 Think About

• Ask yourself which method directly checks the air in the space for refrigerant presence, rather than just the fittings or the tightness of the system. • Think about which choice is appropriate for an existing, charged system in an enclosed area, and which are mainly for pressure integrity testing during construction or major repair. • Consider what makes a leak “large” and in an enclosed area” and what that implies about detecting it quickly and safely.

✅ Before You Answer

• Verify which methods involve pressurizing the system with water and whether that is normally used with refrigerants like R‑22 on operating systems. • Check which tests (vacuum or hydrostatic) are meant to prove system tightness over time, not necessarily to find a suspected large leak in an occupied or enclosed space. • Confirm which option is best practice for safety in an enclosed space where refrigerant may have already accumulated in the air.