Bosch FAS-420-TM, Operation Manual

Page: 40 / 104

40 en | Planning FAS-420-TM Aspirating Smoke Detector
F.01U.088.878 | 4.1 | 2010.11 Operation Guide Bosch Sicherheitssysteme GmbH
Procedure
In the following example , a plan without air filter with 4 openings, not fitted with any other
accessories, should satisfy class B. The red shaded areas show the potential plans with
different pipe shapes and fan voltage.
You will find the planning tables in question in *** 'Planning without air filter' on page 97 ***
and *** 'Planning with Air Filter' on page 98 ***.
General Example
1. Selection:
Select the planning table with or without air filter, as
applicable.
Result:
Planning table and specified air filter
Select the planning table without air filter, ***
'Planning with Air Filter' on page 41 ***
2. Selection:
Select the number of air sampling openings from the
planning table. Note the possible sensitivity classes.
Result:
Specified detector module with specified setting
and alarm threshold
In the *** 'Planning with Air Filter' on page 41 ***
table, select the column with four air sampling
openings (Number of air sampling openings, 4)
3. Selection:
Select the sensitivity (sensitivity class) of the system
according to the gradation described in
Section 3.4 Defining the Response Sensitivity .
Result:
Specified sensitivity class in accordance with EN
54-20
In the *** 'Planning with Air Filter' on page 41 ***
table, select the response sensitivity you require
(class A, B or C) from the column highlighted in red.
You must select the class that corresponds to the
configured sensitivity.
4. Selection:
Select other pipe components, such as a water
separator.
Result:
Specified planning table
Select the *** 'Without any other pipe accessories' on
page 41 *** table.
5. Selection:
Select the possible pipe length for the relevant pipe
shape and fan voltage.
Result:
Specified planning in accordance with EN 54-20 for
the previously specified parameters
In the *** 'Without any other pipe accessories' on page
41 *** table, select the pipe shape and fan voltage you
require, and note the permissible total pipe length.
Abbreviation Meaning
S Sensitivity (% LT/m)
MA Main alarm
PA Pre-alarm
l [m] Permissible total pipe length in meters