Mounting
ASD 535, Mounting and installation, T 140 333 d en
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2.4
Mounting the detector housing
Notices
•
Mounting work on the detector housing is best done without fitted smoke sensors.
•
The smoke sensors are always installed in the detector housing just when the ASD 535 is commissioned (see
•
Depending on the situation (e.g. if there is a long time between mounting and commissioning or if the envi-
ronment is very dusty due to construction for example), the housing cover should be kept closed until com-
missioning the device.
•
Mounting of the detector housing within hostile environments (according to Australian Standard AS 1603.8) is
not allowed.
The detector housing should always be kept in the room to be monitored. If this is not possible, it must be guaranteed that the
detection housing is located in a room which has the same air pressure or – for air-conditioned rooms – the same climate and
pressure zone. In applications where the sampling pipe and detector housing are mounted in different climate zones, a return
sampling pipe to the monitored area is required. The return line can be adapted after removing the air outlet pipe plug on the
ASD 535 housing. In this context, see also Sec.
2.4.3. The maximum length of the return line must not exceed 20 m.
In areas with significant temperature fluctuations of more than 20°C, special adjustments (larger airflow window, longer delay
time etc.) may have to be performed for the sampling pipe and on the detector housing. This also applies to temperature dif-
ferences of more than 20°C between sampling pipe and detector housing.
An easily accessible installation location should be chosen so that the detector housing can be worked on without aids such as
ladders and scaffolding. The ideal installation height of the detector housing is about 1.6 m above the ground (top edge of the
detector housing).
On the entry side of the sampling pipes a minimum distance of 20 cm from building elements should be maintained (see
) to enable fastening the housing cover (commissioning and maintenance work). On the entry side of the supply cable, 10 cm
distance is sufficient.
When determining a location for the detector housing, take into account that the noise caused by the fan may in some in-
stances be disturbing. If no suitable location is available for the detector housing, it may be necessary to mount it in an acous-
tically insulated cabinet (e.g. ASD sound insulation housing). If air recirculation in the same climate zone as the sampling pipe
is necessary, it can be implemented by means of a tube piece out of the acoustically insulated cabinet. The pipe piece exiting
from the acoustically insulated cabinet (transition) must be properly sealed. When using the ASD sound insulation housing, an
M32 cable screw union is used for the transition. Contact the manufacturer for more information about the ASD sound insula-
tion housing.
Содержание ASD 535
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