Bosch FAS-420-TT Series - Page 80

80 en | Installing the Aspiration smoke detector Aspiration smoke detector LSN improved
2020.04 | 6.1 | F.01U.029.275 Operation guide Bosch Sicherheitssysteme GmbH
Mounting (type MT-1) Cylinder or flat head screws
– Thread diameter: max. 4mm
– Head diameter: 5 to 7mm
Bore distances
The distances between the bores are shown in the figures below (all measurements in mm).
30
255
160 200
292
Figure5.2: Bore distances of FAS-420 without mounting
90 30
36
53
92
4,5
30
28,5 33,5
4
360
320
210
260
285
205
42
8,4∅
330
420
432
170
150
Figure5.3: Bore distances with mounting type MT-1
Reducing operating noises
If the aspirating smoke detector is installed in noise-sensitive areas, observe the instructions
in Measures for reducing operating noise, page 18 .
1. First, clearly mark the fixing points on the installation position provided on the
equipment. Use the supplied drilling jig as an aid. To guarantee a safe and low-vibration
hold, the unit must be secured with four screws.
2. Using four screws appropriate for the installation method, attach the unit securely to the
surface or to the unit mounting. Ensure that the unit is not fixed under mechanical stress
and that the screws are not tightened too tightly, otherwise damage or undesirable
resonance noises could occur. To equalize unevenness and/or prevent vibrations,
vibration absorbers (subject to separate order) must be used.
Connecting the aspiration pipe
– To connect the aspiration pipe to the FAS-420, insert it into the pipe connection
provided.