What role do fixed refrigerant-gas detectors play in B28 compliance?

• A. They are optional and rarely used.
• B. They increase energy consumption.
• C. They only log data for records.
• D. They provide early leak detection, trigger alarms, and can interlock ventilation or shutdown sequences to prevent ignition.

Answer: (D)

In B28 practice, the important idea is that a flammable refrigerant leak must be detected quickly and the system should respond automatically to prevent ignition. Fixed refrigerant-gas detectors provide continuous monitoring in the spaces where the refrigeration equipment operates. When they sense gas above a safe threshold, they trigger alarms to warn people and, more critically, can be wired into the building or equipment controls to interlock ventilation or shutdown sequences. This means the ventilation can start or increase to dilute the vapor, or critical equipment can shut down to eliminate ignition sources, all automatically. This immediate response is what helps prevent the formation of an explosive mixture and reduces the risk of ignition, meeting the safety and compliance goals for flammable-refrigerant systems. They aren’t optional nor merely data loggers; they actively protect occupants and equipment by providing early detection and automatic control actions.