Bosch FAS-420-TM-R Operation Manual page 66

66 en | Installation of the pipe system
* PVC pipes do not correspond to the temperature range given above.
Notice!
When constructing the pipe system, observe the temperature range specified in Pipe system,
page 29 .
Installation instructions
The pipe system must be constructed according to planning specifications and taking into
account the planning guidelines (see Planning, page 30 ).
1.
2.
Notice!
If halogen-free plastics must be used, the installation procedures may vary depending on the
selected material:
ABS is glued
Polypropylene (PP) is welded
Polyamide (PA) is pushed together and bolted.
3.
Notice!
Pipe bends must be given preference over pipe elbows. Too many bends and pipe elbows
reduce the air speed in the aspiration pipe, thereby increasing the detection time.
A 90° pipe elbow corresponds to a straight pipe length of 1.5 m. Because of this, the
maximum total length of the pipe system is reduced by 1.5 m.
4.
Notice!
Do not use pipe clips with rubber inserts since these do not allow length extensions and the
pipe system could thus bend or even tear.
5.
Notice!
On completion, test the pipe system:
For tightness
For fault-free connections
For correct planning of the air sampling openings.
2020.04 | 5.1 | F.01U.088.878
Shorten the pipes with a pipe-cutter (38 mm) or a metal saw. Deburr the joints and clean
up the chips.
Before gluing, clean the adhesion points with the prescribed cleaning agent (Tangit) to
remove dirt and grease. Use the Tangit adhesive to glue the pipe transitions with the
appropriate fittings so that they are airtight.
Minimize pipe lengths and changes of direction. Pipe elbows have an extremely high flow
resistance. Therefore, they should only be used where they cannot be avoided for
structural engineering reasons. If necessary, reduce pipe lengths in proportion to the pipe
elbows used.
Fix the pipe system. It must not sag or be possible to move it. Fasten the pipes with pipe
clips without rubber inserts. The distance between the pipe clips should not exceed
80 cm. At high temperatures, reduce the distance between the pipe clips to a maximum
of 30 cm.
Close open pipe ends with an end cap.
Operation guide
Aspiration smoke detector LSN improved
Bosch Sicherheitssysteme GmbH