In the event of a fire, the fire damper thermal fuse will melt and the actuator voltage will be cut off. The fire damper motor should close the damper, but if the fire damper is stuck in the open position, the spring force of the fire damper motor will not be enough to close it.
Traditional automation systems do not recognize this as a fire situation, because they only monitor the actuator “open” limit switch.
Because the Monitor F system also monitors the current drawn by the fire damper actuator, the system detects a fire even if the fire damper is stuck in the open position!
