496236 Issue 4
9
2. System Planning
2. SYSTEM PLANNING
Installation Precautions
Before installation ensure that all windows and doors are secure and do not
need repair. False alarms can occur if doors and windows are insecure.
Make sure there will be no pets or movement which will directly affect the
performance of any movement detectors.
Where possible fit locks to the ground and upper floor windows. By delaying
an intruder, the alarm system can be simpler, more effective and less likely to
false alarm than a complex system covering all rooms and windows.
Locating The Control Panel
Install the control panel in a safe, unobtrusive position near a mains supply.
Stair cupboards are suitable in most houses. Position the unit so that the user
can see the control panel easily, and set and unset the system without diffi-
culty. Make sure the user can reach the final door promptly and hear the exit
tone at the required distance. Fit an extension speaker if necessary.
Locating The External Bell
Fit the unit as high as possible, to reduce the chance of interference by an
intruder. Locate the unit in a position where it may easily be seen. Do not
locate the bell facing heavy traffic or a railway as this can affect the ability of
the bell to be heard at a relatively short distance. The wiring to the unit should
enter the bell directly through the wall. Never run surface wiring to an external
bell.
Locating The Deterrent Bell (Dummy)
For additional protection a 'Dummy' bell housing can be fitted to the other
sides of the building. The housings are identical in appearance to the real unit
but do not contain any equipment. These act as good deterrents from any
elevation to show the house is protected.
Detectors
There are several types of detector available suitable for a simple domestic
installation:
A Passive Infra Red (PIR) is a movement detector which detects an intruder
by infra red body heat compared to the normal room level.
A Door contact is a magnetic reed switch used to detect the opening of
windows or doors.
A Vibration detector is designed to detect a shock attack on a window or door
frame.
Summary of Contents for 9448+
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