Chapter 2: Installation and configuration
LaserSense Nano Aspirating Smoke Detector Installers Handbook 21
Refer to
Figure 2
on page 5 for an illustration of the Nano detector with the
front cover removed. Refer to
Figure 10
below for a detailed illustration of the
power input terminals.
2. Connect 0 V and +24 VDC to the “0V” (-24) and “+24V” screw terminals,
respectively.
3. Connect the shielded (screened) wire to the “EARTH” screw terminal.
Figure 10: Power supply terminals
Relay connections
The Nano detector includes an Alarm and a Pre-Alarm relay, which will
transfer to the normally open (N.O.) position on alarm. It also includes a
general Fault relay, which will transfer to the normally closed (N.C.) position
during a fault condition or on power-down.
The relays are of the volt-free type, with a maximum current capacity of 1A at
24 VDC maximum. To comply with radiated immunity requirements, it is
recommended that the relay connection wires be looped once around a
suppression ferrite (provided). There should be about 1-
1/4
inch (30 mm) of wire
between the end of the ferrite and the terminal block to give adequate stress relief.
To achieve this, it is necessary to strip back the cable shield approximately
5 inches (130 mm). The shield should be terminated under the cable gland cap.
The Nano detector interfaces to fire alarm panels using the detector’s
ALARM, PRE-ALARM, and FAULT relay contacts.
Make all connections shown in
Figure 11
on page 22.
Input connection
The Nano detector is fitted with an “INPUT” connection. This provides an
input which can be used to monitor the PSU or to desensitize the detector by
using the day/night feature. DIP switch number 7 must be set as described in
Figure 11
on page 22.
The INPUT terminals on the detector circuit board are set by default to monitor
the power supply. If power supply monitoring and ClassiFire override are not
required, fit a wire link across the two terminals to prevent a fault condition on
power-up.
Make all connections shown in
Figure 11
on page 22.
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