Ziton ZP3-ECU Installation And Commissioning Manual page 7

Limitations
Equipment compatibility
The extinguishant cylinder release mechanism must be compatible with the ECU
activating circuit. Incompatibility can cause malfunction.
Sensing equipment limitations
The extinguishing control system equipment is reliant on external detection
equipment such as detectors, call points, and fire control panels in order to
activate effective fire alarms. Incorrect positioning of the detectors, limitations in
the detector itself, or incorrect application can result in failure of the detection
process.
Bells and sirens
When the extinguishing control system causes an extinguishing discharge, the
appropriate fire bells and sirens sound. These could prove useless unless they
are situated in close proximity to the people they are supposed to alert.
ZP3-ECU Extinguishing Control Unit Installation and Commissioning Manual v