Chapter 2: Operation
ZP3-ECU Extinguishing Control Unit User Guide
13
The Locked-off/Reset key switch
The ECU can be disabled while the system is being maintained in order to
prevent accidental activation of extinguishant.
Turn the Locked Off/Reset key switch (Figure 4, item 4) clockwise to the
horizontal position to disable the unit, the following occurs:
• The two red Locked Off/Reset LEDs (Figure 4, item 3) illuminate.
• If a printer is connected to the fire alarm control panel then the event details
are printed.
Turn the Locked Off/Reset key switch anti-clockwise to the vertical position to
enable the ECU once maintenance has been completed. The two red Locked
Off/Reset LEDs go out and the event details are printed (if a printer is
connected).
Fault conditions
The following takes place if a fault occurs on the extinguishing control system:
• The two yellow Fault LEDs (Figure 4, item 2) on the ECU illuminate.
• The panel buzzer on the fire alarm control panel sounds, the common Fault
LED illuminates, and the display shows a fault message (with the zone
number and loop address).
• If a printer is connected to the fire alarm control panel then the event details
are printed.
• Press the Accept/Panel Silence button on the fire alarm control panel to
silence the panel buzzer.
• Notify the maintenance staff or company to have the fault investigated and
rectified.
• Press the Accept/Panel Silence button then the Reset button on the fire alarm
control panel after clearance of the fault. The panel should return to normal.
Delay time settings
The default delay is 30 seconds. This can be configured to any value from 5 to
45 seconds.
