Planning
41 / 121
4.4.4
System limits for space surveillance without “ASD PipeFlow” calculation
The system limits specified in this section apply to planning without using the “ASD PipeFlow” calculation software. Stored un-
der the system limits are switch positions with pre-defined values. There are two areas, with the following meaning:
•
normative system limits according to EN 54-20, Class A to C, switch positions
A11
to
C31
;
•
Non-normative system limits, switch settings
W01
to
W44
.
below illustrates the possible sampling pipe tube networks with definitions of tube length specifications. The maximum
tube lengths and number of sampling holes as well as the required smoke sensor types are found in the tables in Sec. 4.4.4.3
based on response class.
Fig. 9 Sampling pipe definitions
4.4.4.1
Normative system limits for space surveillance without “ASD PipeFlow” calculation
Stored under switch positions
A11
to
C31
are values which are necessary in terms of alarm response sensitivity and airflow
monitoring for compliance with EN 54-20 Class A to C. The switch position designation is deciphered as follows:
•
First digit
Response grade
A
,
b
,
C
(A = highly sensitive, b = sensitive, C = standard)
•
Second digit
System limit
1
,
2
,
3
(tube network length, number of sampling holes)
•
Third digit
Tube networks
1
(number of sampling pipe tube networks on the ASD 532,
only 1 possible
).
Example:
b21
response grade
b
/ system limit
2
/
1
sampling pipe tube network
4.4.4.2
Non-normative system limits for space surveillance without “ASD PipeFlow” calculation
Switch positions
W01
to
W44
contain system limits which fulfil
only
the alarm response sensitivity compliant with EN 54-20
Class A to C,
but not
the normative limits with regard to airflow monitoring. As they are identical with the system limits
A11
to
C31
in terms of tube topology (tube network length, number of sampling holes), the switch positions
W01
to
W44
are also in-
cluded in the tables 4.4.4.3 below. For more details about switch positions
W01
to
W44
with regard to airflow monitoring,
please refer to Sec. 4.4.4.4.
Warning
Switch settings
W01
to
W44
may be used only after consulting with the manufacturer. The airflow monitoring val-
ues stored under those switch positions are
not
tested in accordance with EN.
E-
shaped
A
B
H-
shaped
A
B
U/T-
shaped
A
B
I-
shaped
B
ASD532
Operating
Manual
Summary of Contents for ASD 532
Page 1: ...ASD 532 Aspirating Smoke Detector Operating Manual ...
Page 2: ...2 88 ASD532 Operating Manual ...
Page 6: ...6 121 ASD532 Operating Manual ...
Page 7: ...Document history 7 121 Document history First edition Date 15 10 2015 ASD532 Operating Manual ...
