Smoke Alarm User Manual

Installation, Operation and Maintenance Manual
Issue 1 Page 4-1
February 2001
4 INSTALLATION
4.1 Introduction
The following paragraphs provide information needed to carry out an installation of a High Sensitivity
Smoke Detection (HSSD) system. Installation consists of mounting the Detector and its various optional
items. These items include the Display Module, the Intelligent Interface Module (IIM) andthe stand alone
power supply. Installation should only be carried out by factory trained technicians in accordance with
applicable installation requirements. These being as follows:
(1) British Standard BS6266 : 1992 (Code of practice for Fire protection for electronic data
and processing).
(2) British Standard BS 5839 Pt 1 – Fire Detection & Alarm systems for Buildings – Code of
Practice for System Design, Installation & Service.
(3) British Fire Protection Systems Association – BFPSA Code of Practice for Category 1
Aspirating Smoke Detection Systems.
(4) Any other local installation requirements.
4.2 Locating the Detector
Mount the Detector as close as possible to the protected areas. This minimises transportation time and
air resistance in the air sampling pipe network.
The Detector should be located in an area where the air pressure surrounding the unit is the same, or
lower than the atmospheric pressure around all the sampling ports in the sampling pipe network. A
building’s HVAC fans may positively pressurise a space creating a pressure differential within the
building. If the detector is located in an area where the pressure is greater than the sampling pipe, a
resistance to the normal airflow through the pipe will occur. Also, if individual sampling holes are exposed
to different static pressures air may not flow properly, resulting in uneven sampling.
If the detector must be located in a higher-pressure area than the entire sampling network, or if the
sampled air must be returned to the protected area, an exhaust port adapter must be used. The exhaust
port adapter allows a return pipe to be fitted on to the exhaust port of the Detector.
To reduce the possibility of condensation the Detector must always be at approximately the same (or
higher) temperature than the air-sampling pipe network. If the Detector is protecting ducts it is
reccomended that the exhaust air from the Detector be returned to the duct by use of the exhaust port
adapter and associated piping. This requirement assures positive airflow through the Detector.
When installing a flush mounted unit the option is available to have the exhaust port and cable entry
through the rear. Should this method of mounting the Detector be employed then the self contained
Power Supply cannot be used. A flush mount Bezel kit is available for this type of installation.
The Detector can also be mounted upside down to allow the pipe inlet to come from below the unit to
meet with application requirements. Should this method of installation be employed the Display Module
can be reversed allowing correct orientation of the display.
Should the Detector be mounted in an area which is not easily accessible to a user, then the Display
Module can be situated remotely in a more accessible location.
To enable the Display Module to be monitored by the user, it is a requirement when installing the unit to
use the optimum viewing angle. Therefore it is recommended that the unit be mounted at a height which
can be easily observed.