Maintenance and service
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9.3
Maintenance checks and function checks
Notice
To avoid triggering fire incident controls, remote alerting and extinguishing areas when carrying out maintenance
work, it is
essential
to block or switch off those systems beforehand.
For maintenance and function checks, carry out the following points:
1.
Block or switch off fire incident control and remote alerting on superordinate FACPs.
2.
Check that the supply voltage on the FACP is set in compliance with maintenance instructions for the control panel.
3.
Check that the sampling pipe inlet is correctly seated.
4.
Check the air outlet for any dirt or dirt and clean if necessary.
5.
If the ASD 532 is used for equipment monitoring and plug-in transitions from rigid to flexible pipe sections are in place,
check that the transitions are correctly seated (no leakage).
6.
Open the cover of the detector housing. Carry out the following measurements:
•
Measure the operating voltage on terminal 1
(+)
, 2
(-)
target value = 17.6 to 27.6 VDC.
•
Readout sampling pipe airflow value in switch setting
V
(see Sec. 7.6.1) and compare with commissioning protocol.
If there is a deviation of more than half the set sensitivity (see examples
and
), check the sampling pipe as fol-
lows:
-
An
increase
in the value (more than 100%) tends to indicate
pipe breakage
check the sampling pipe for
leaks (junctions, fittings, etc.)
-
A
decrease
in the value (less than 100%) tends to indicate a
pipe blockage
check the sampling pipe for pipe
blockage, clean as described under
Item
9 or
Item 10
Set
LS-Ü
sensitivity = ±20% (default); half of that = ±10%. The sampling pipe should therefore be checked if the
value is below 90% or above 110%.
Set
LS-Ü
sensitivity = ±50% (non-compliant with EN 54-20), half of that = ±25%. The sampling pipe should therefore
be checked if the value is below 75% or above 125%.
7.
Switch off the ASD (pull terminal block 1/2 and if necessary 3/4 on the AMB 32). After disconnecting the ribbon cable
from the smoke sensor, carefully remove the sensor from the ASD.
8.
Use a soft, dry paintbrush to clean the inside of the smoke sensor chamber and the insect protection screen. Oil-free
compressed air or nitrogen can also be used for cleaning.
Warning
Do not use compressed air either to blow out or open the smoke sensor. Improper handling can affect the
response characteristics. Only the manufacturer is authorised to clean dirty smoke sensors. The smoke
sensors are monitored for dust and dirt; their states are displayed on the control unit. If required the smoke
sensor must be replaced.
After cleaning the smoke sensor chambers, re-insert the smoke sensor into the ASD.
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 ...
