FAS-420-TM Aspirating Smoke Detector
Installation of the Pipe System | en
73
Bosch Sicherheitssysteme GmbH
Operation Guide
F.01U.088.878 | 4.1 | 2010.11
5.7
Three-way tap
The three-way tap is required to blow out the pipe system with blast air (as a preference) or
compressed air*. The aspirating smoke detector and the downstream pipe system accessory
components (e.g. air filter) must not and cannot be blown-out.
A check valve for relieving pressure from the pipe system must be fitted to the end of each
pipe branch. The check valve prevents damage to the air sampling openings and prevents dirt
deposits from being blown through the pipe system.
To prevent aspiration reducing film sheets in deep-freeze areas from tearing, it is advisable to
use special deep-freeze aspiration reductions.Check valve and deep-freeze aspiration
reductions are available on separate order.
Connections
Fasten the three-way tap using the transition screw connections in the pipe system.
When installing, note the assignment of the connections (see
Figure 5.8
):
–
Install the aspiration pipe system on connection C.
–
Install the FAS-420-TM on connection A.
–
Attach the blast air supply (blast or mobile blowing-out system) to connection B of the
three-way tap.
Refer to
Section 7.7 Blowing-out Process for the Pipe System, page 90
for information on how to
carry out the manual blowing-out process.
5.8
Water separator
Standard
The standard water separator is installed using a PG29 cable gland and a T-fitting between the
FAS-420 and the pipe system.
Figure 5.8
Installing the three-way tap
1
Blast air/compressed air
connection
2
Pipe system connection
3
Aspirating smoke detector
connection
4
Air filter (optional)
* Compressed air is compressed, non-purified and humid ambient air. Blast air, on the other hand, is
purified and dehumidified air. If the FAS-420-TM and pipe system are located in areas with temperatures
below freezing, blast air is to be used for blowing out.
FAS
-42
0-T
M s
erie
s
A
B
C
1
2
3
4
A
B
C
2.
A
B
C
3.
A
B
C
1.
Summary of Contents for FAS-420-TM
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