FACU protection is provided by which methods?

• A. By automatic smoke detection or by automatic heat detection when ambient conditions prohibit smoke detectors
• B. By automatic heat detection
• C. By automatic smoke detection
• D. Manual activation only

Answer: (A)

FACU protection relies on automatic detection methods to sense a fire and trigger the system. The best approach is to use automatic smoke detection, which can provide rapid warning from the presence of combustion byproducts. When ambient conditions around the FACU would make smoke detectors unreliable or prone to nuisance alarms—such as excessive dust, steam, or other factors—automatic heat detection serves as a reliable backup. In short, protecting the Fire Alarm Control Unit is achieved by automatic smoke detection, with automatic heat detection used when smoke detectors cannot operate effectively. Manual activation alone does not provide automatic protection.