Chapter 2: Installation and configuration
LaserSense Nano Aspirating Smoke Detector Installers Handbook 19
Electrical installation
In keeping with good wiring practice, keep cables and individual stripped
conductors as short as possible while allowing stress-relieving cable forming.
Power cables should be current-rated at 1A or greater. Signal cable should be
120 ohms or less twisted pair.
Figure 9 below shows the terminal block connections that connect the Nano
detector to other electronic components. It is recommended that all connection
wires are marked with suitable identification labels or colored rings to aid in the
connection process.
Figure 9: Electrical installation
(2
(3)
(1)
(4)
(1) Power supply connections
Connect to 24 VDC 1A PSU.
Do not connect 0V to EARTH.
Use screened cable with screen connected to the detector EARTH terminal.
(2) Volt-free relay contacts rated at 1A maximum at 24 VDC
All relay diagrams are shown in their contact states with the detector powered up and
operating normally.
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