What is the function of a relief device in B28 systems?

• A. To relieve overpressure and protect components in the event of compressor or valve failure
• B. To regulate room temperature
• C. To filter refrigerant
• D. To provide alarms

Answer: (A)

Relief devices in B28 systems are there to prevent dangerous pressure buildup. In a flammable refrigerant setup, compressors and valves can fail or become blocked, causing pressure to rise beyond what the system was designed to handle. When the pressure hits the preset level, the relief device opens and vents excess refrigerant gas to a safe location or to the atmosphere. This protects equipment like compressors, piping, and vessels from overpressure and helps prevent ruptures or other hazardous situations. This purpose is distinct from regulating room temperature, filtering refrigerant, or providing alarms, which are handled by other components or systems.