Chapter 2: Installation and configuration
14 LaserSense Nano Aspirating Smoke Detector Installers Handbook
• The exhaust air from the detector must be returned back to the duct using an
exhaust-port adapter and associated piping. This requirement assures
positive airflow through the detector.
• Locate sampling pipe in the main supply duct return side, downstream of the
filters and a minimum of six duct widths from any source of turbulence (such
as bends, inlets, or deflection plates) to reduce the effects of stratification. In
installations where the filter is capable of removing smoke, install the
sampling tube upstream of the filter.
Note: Where it is physically impossible to locate the sampling pipe in
accordance with this guideline, the sampling pipe may be positioned closer
than six duct widths, but as far as possible from inlets, bends, or deflection
plates.
• Locate the sampling pipe such that dampers do not restrict airflow at the
sampling pipe.
• The sampling pipe should be located before air exhausts from the building or
before diluting return air with outside air.
• For accurate identification of the source of an alarm, locate sampling pipe as
close as possible to the protected area's air entry into the duct system.
• Locate sampling pipe on the downstream side of the filter to sense fire in the
filters.
Note: If filters are blocked, sufficient airflow may no longer be present for
proper operation.
• Do not locate sampling pipe near outside air inlets except to monitor smoke
entry to the handling system for adjacent areas.
• Whenever possible, locate sampling pipe upstream of air humidifiers and
downstream of dehumidifiers.
Note: Deviation from these recommended guidelines may reduce the
performance of your air sampling pipe system and detector.
To Next Page
Loading...
Need help?
General
