Heat from a fire causes the heat-actuating plug in the sprinkler to drop from the frame.

Water contained in the piping immediately discharges from the open sprinkler.

As water begins to flow through the system, the alarm check valve on the water supply riser opens and activates the water motor gong and /or electronic signaling equipment.

The alarm is transmitted to a supervising agency or fire department.

If needed, the volume and pressure of water in the system is boosted via a fire department pumper through the fire department connection.