Conducting The Functional Test - Bosch FAS-420-TT Series Operation Manual

Aspiration smoke detector LSN improved
Testing the functionality of the FAS-420
Notice!
For the FAS-420-TP2 and FAS-420-TT2, the preparation for the function test (see above) and
the following functional test (steps 1–7) are to be carried out for both detector modules and/
or both pipe systems.
7.6.2

Conducting the functional test

The functional test can be conducted with or without a digital pressure gauge. The complete
test is described below. If the test on the FAS-420 reveals deviations from the described
procedure, the unit or its airflow sensor is defective.
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Notice!
A pipe breakage or pipe obstruction is indicated by a flash code via an LED on the detector
module (see Section 7.2 Flash Code Table, page 94):
Breakage: 3 x flashes
Obstruction: 2 x flashes
The corresponding flash code is repeated every two seconds.
DIAG diagnostic software
The DIAG Diagnostic Software can be used to track airflow values during the function test.
Save all diagnostics data as a file. To be able to compare the data read out, save each file
under a different file name.
Information for installing the diagnostic software can be found in Preparation, page 96 .
Bosch Sicherheitssysteme GmbH
1
4
B
A
Make sure that the aspirating smoke detector has been operating for at least 30 minutes.
Close all the test pipe's aspiration borings with some duct tape. After a few seconds, the
LED flash code on detector module I and detector module II must signal an obstruction.
After a short run-up time, the negative pressure must lie within the following range:
– Fan voltage 6.9 V: 250 Pa to 310 Pa
– Fan voltage 9 V: 460 Pa to 530 Pa.
Open all of the test pipe's aspiration borings. After a few seconds, the flash code of the
LED must go out.
Remove the test pipe. The LED flash code on detector module I and detector module II
must signal a breakage.
Reconnect the test pipe to the device. After a few seconds, the flash code of the LED
must go out.
1
2
ø 4,6 mm
ø 4,2 mm
ø 7,0 mm
2
3
3
Operation guide
Commissioning | en 101
1 Test pipe
2 Aspiration borings
3 Pressure measuring hose
4 Adapter
5 Digital pressure gauge
A/B Adapter connection
5
2020.04 | 6.1 | F.01U.029.275