How should leaks be addressed once detected in a B28 installation?

• A. Ignore and continue operation.
• B. Ventilate only and never repair.
• C. Evacuate or isolate the area, initiate ventilation, repair the leak, purge if necessary, and re-test before return to service.
• D. Shut down and leave without re-test.

Answer: (C)

Leaks in a B28 installation create a serious flammability hazard, so the response must quickly control the area, dilute the vapor, and restore a safe condition before the system runs again. Evacuating or isolating the area protects people and reduces ignition risks; initiating ventilation helps lower the concentration of flammable refrigerant in the space. After that, repairing the source of the leak stops the ongoing release. Purge if necessary to remove any lingering pockets of vapor and ensure the environment around the system is free of flammable gases. Finally, re-test to confirm the leak is repaired and the system is safe to return to service. This sequence catches the hazard early, ensures the leak is actually fixed, and verifies there are no residues that could reignite or leak again. Ignoring the leak, venting without repair, or shutting down without re-testing fails to address both immediate danger and long-term safety.