Heat detectors and manual pull stations are essential components of fire alarm systems, each serving a unique purpose in detecting and responding to fire emergencies. Heat detectors are designed to sense temperature changes associated with fire. There are two main types of heat detectors: fixed temperature and rate-of-rise.

Fixed temperature heat detectors trigger an alarm when the temperature reaches a predetermined level, typically around 135°F (57°C).

Rate-of-rise heat detectors trigger an alarm when the temperature increases rapidly, usually by about 15°F (8.3°C) per minute.

Heat detectors are particularly useful in environments where smoke detectors might be prone to false alarms, such as kitchens, garages, or dusty areas. They are less sensitive to non-fire conditions like steam or dust, making them a reliable option for such locations.

Manual pull stations allow building occupants to manually trigger the fire alarm system in the event of a fire. These devices are typically located near exits and along escape routes, ensuring they are easily accessible during an emergency. When activated, manual pull stations send a signal to the fire alarm control panel, which then initiates the alarm and notifies emergency services.

Proper placement and maintenance of heat detectors and manual pull stations are crucial to their effectiveness. Heat detectors should be installed on ceilings or high on walls, away from air vents or other sources of air flow that could affect their performance. Manual pull stations should be mounted at a height that is easily reachable by all occupants, including those with disabilities, and should be clearly labeled and unobstructed.

Regular testing and maintenance of both heat detectors and manual pull stations are essential to ensure they function correctly during an emergency. By understanding the roles and proper installation of these devices, installers can enhance the safety and reliability of fire alarm systems.