User Manual

Concise user manual | NANO-EN | October 1, 2022 | version 2.2 page 12
17 C ONNECTING USING THE EXTINGUISHER TERMINAL BOARD (ETB)
The ETB is developed for use with the NANO and aerosol extinguishers. This terminal connection
board is equipped with built-in security electronics, which ensures that all igniters of the extinguishing
units are activated. Together with an end line switch, this option turns the NANO system into a
complete and reliable fire detection and extinguishing system.
WARNING
Incorrect placement of the end line switch makes it possible to disable a part of the extinguisher’s
activation circuit. Therefore, a visual inspection is an essential part of the commissioning and
maintenance engineers work.
18 WIRING DIAGRAM OF THE NANO MEANT FOR SOLENOID SYSTEM
In addition to a fire extinguishing output for electric igniters meant for aerosol fire extinguishing
generators, the NANO also has an extinguishing output suitable for a solenoid-controlled fire
extinguishing system. The extinguishant output is capable of supplying up to 1 Amp for the maximum
duration to a solenoid. Solenoids must have a resistance of 25 to 200 ohms 18/28V DC, to ensure that
the maximum current rating of the extinguishant output is not exceeded. The maximum cable
impedance is 1.5Ω-5.0Ω depending on the coil impedance. Despite the presence of a button on the
NANO front for manual extinguishing activation only, we do recommend a maintenance key switch
in the extinguishing output line to perform test and maintenance work without activating the system.
DISCONNECT EXTINGHUISHER
Move the disconnect switch in the YES
position and the aerosol extinguisher
is disabled and can not be activated.
All ETB’s connected thereafter will
remain in operation. A disablement
will be signalized as fault on the NANO.
ENABLE END OF LINE DIODE
To monitor for short circuit or wire
break, only the end of line switch on the
last ETB must be set into the YES
position. A failure to do so will be
signalized as a fault on the NANO panel.