Edwards LaserSense Nano User Manual

Chapter 2: Installation and configuration
LaserSense Nano Aspirating Smoke Detector Installers Handbook 9
System design
Pre-engineered piping designs simplify the installation of the detector pipe
network. The following criteria ensure that the airflow and transport times are
within the design of the detector. The design parameters listed below must be
adhered to for all pre-engineered pipe designs. Pre-engineered piping
networks should not exceed the transport time requirement of 120 seconds.
During the system test, transport times are often less than 55 seconds.
• The maximum of three elbows and one pipe tee can be used in any pipe
network design.
• When using a pipe tee, it must be located within 20 feet of pipe from the
detector.
• All capillary tubes will have a maximum length of 3 feet and use a 9/64 inch
sampling hole size.
• The first sampling hole must be 10 feet or more from the detector.
• The use of sampling capillary tubes and sampling holes can be mixed in any
combination on the pipe network.
• On branch designs, the same number of sampling holes must be used on
each branch.
Table 2: Sample pipe network parameters
Total pipe
length
Max amount
elbows
Max sampling
points
Sampling
hole size
Capillary tube
sample hole size
End cap
hole
164 feet 3 10 1/8 inch 9/64 inch 5/32 inch
Note: PipeCAD pipe modeling software is used to design pipe networks outside
the above parameters. Refer to the PipeCAD System Design and Installation User
Manual for complete instructions.
The Nano detector employs a fan designed to detect smoke in relatively small
areas. The Nano detector is not intended to protect large areas, or to sample from
areas where there may be any difference in airflow rates or pressure
differentials. If detection in environments conforming to these descriptions is
required, other type detectors should be used.
Always locate the sampling points in positions to which smoke may reasonably be
expected to travel. It is usually better to locate the sampling pipe directly in the
airflow (for example, across the return air register of an air conditioning unit).
Note: There is no substitute for carrying out smoke tests prior to installation of
pipework to indicate suitable sampling point location.

Edwards LaserSense Nano Specifications

General

Brand	Edwards
Model	LaserSense Nano
Category	Smoke Alarm
Language	English