22318.37.01 15.09.05
4
3.2. Detector Positioning In Atrium.
If the detector is to be placed in an atrium, or near glass/polished surfaces, the prism(s) should be offset from the central
line of sight (approximately 300mm), and angled back to the beam detector. This can be either on the vertical or horizontal
axis. This will reduce the amount of spurious returned signal from the glass/polished surfaces. The reflected signal from the
prism(s) will be returned to the detector in the normal way.
4. Installation.
Pre-installation at Ground Level.
Confirm that all parts have been supplied as listed in the parts list. See page 11.
Select the required alarm threshold using switches 3 and 4 (See fig. 4. for switch configuration settings). The
factory default setting is 35% this should be adequate for most environments, if the Detector is to be installed
into an exceptionally dirty environment change the threshold to 50%.
The Detector Head Assembly is now ready for installation. If switches 3 and 4 require resetting after installation,
a power down reset is required (entering into Alignment Mode can also be used as a reset).
4.1. Detector Head Assembly Installation.
Remove the outer cover before installation; this is only to prevent the cover becoming dislodged during
handling.
Do not mount on plasterboard or cladded walls as these surfaces do, and will move.
Determine the position of the Head Assembly, which
must be mounted on a
solid structure
between 0.5 and
0.6 metres below the ceiling, and no closer than 0.5 metres to an adjacent wall or structure. Ensure that there is
a
clear line of sight
to the proposed position of the prism, which is to be mounted on a solid structure between
5 and 100 metres directly opposite the Detector (range dependent on model).
Using the template provided mark and install all 4 fixing points to the structure. The rear mounting plate of the
Detector Head Assembly is provided with 4 keyhole slotted apertures to allow for easy installation onto the 4
fixing points.
Replace the outer cover.
Terminate the field wiring. See section 8.
4.2. Prism Installation.
Due to the principle of the detector i.e. reflective, the prism must NOT be mounted on glass or a
polished reflective surface.
Mount the Prism on a
solid structure
, 90º to the beam path, between 5 to 50 metres (MAB50R), and 50 to100
metres (MAB50R) directly opposite the Detector.
MAB50R =
MAB100R =
1 Prism
4 Prisms
Offset Prism(s) position and beam path
Normal Prism(s) position and
central line of sight
Detector
head
Plan View
www.acornfiresecurity.com
www.acornfiresecurity.com
