The components include all devices and circuits that send a signal to a fire alarm control unit (FACU) such as heat detectors, smoke detectors, carbon Fire alarms Fire alarms need to function all of the time, they cannot go down unless service personnel or Firewatch people are on site. Fire alarms, unlike our computers, cannot be rebooted over and not part of a fire alarm system but are the most common fire detection device used today. The main purpose of a fire alarm system and smoke alarms are