Chapter 3: Commissioning
20
ZP3-ECU Extinguishing Control Unit Installation and Commissioning Manual
Commissioning checks
Extinguishing control unit
Make sure that:
• All field wiring is tested and correct and is connected (except the actuator and
power).
• The display PCB is connected via ribbon cable connector.
• SWT3 settings on the main PCB are correctly configured (see Table 1 below).
• Fuses have the correct ratings: F1 (6.3 A), F2 (2 A), and F3 (2 A)
Table 1: SWT3 settings
SWT3
Position
Description
Switch 1
OFF
Extinguishant released signal not verified
ON
Extinguishant released signal sensed via pressure switch in
extinguishant distribution piping and reported to panel
Switch 3
ON
More time function to operate on the double knock automatic
actuation
Switch 4
ON
With jumper L5 (on display board) OUT = No delay between MCP
activation and actual extinguishing
OFF
With jumper L5 (on display board) IN = Delay as per the setting of
VR1 of the display board between MCP activation and actual
extinguishing [1]
[1] VR1 on the main board sets the activation delay for double knock automatic discharge
Bells/sounders
Make sure that:
• The fire alarm sounders (if connected to the ECU) are fitted with polarizing
diodes.
• The last fire alarm sounder in the circuit (if connected to the ECU) is fitted
with a 2K2
Ω
EOL resistor.
If the fire alarm sounder is not connected to the ECU (for example, it’s
connected to the fire alarm control panel), then connect a 2K2
Ω
resistor
across terminals TB1.4 and TB1.5 on the ECU.
• The extinguishant discharge sounders are fitted with polarizing diodes.
• The last extinguishant discharge sounder in the circuit is fitted with a 2K2
Ω
EOL resistor.
