Bosch FAS-420-TM - Filter Change on the Filterbox

FAS-420-TM Aspirating Smoke Detector Maintenance | en 89
Bosch Sicherheitssysteme GmbH Operation Guide F.01U.088.878 | 4.1 | 2010.11
7.6 Filter Change on the Filterbox
To replace the filter inserts, proceed as follows (see Figure 7.3):
1. Remove the four screws and remove the housing cover.
2. Remove the old filter inserts and clean the inside of the housing carefully to remove dust.
Now fit the cleaned or new filter inserts. When using the spare filter set for the large
filterbox, ensure you follow the correct sequence (see label on base of housing).
Replace the housing cover and screw it back on.
Figure 7.3 Changing the filter inserts (in fig.: FAS-ASD-FL Filterbox Large)
A Primary filter
B Coarse dust filter
C Fine dust filter
1.
2.
A
B
C
F
A
S
-4
2
0
-
T
M
s
e
rie
s
NOTICE!
In applications with largely fine dust build-up, three fine dust filters can also be used (subject
to separate order).
NOTICE!
Opening the housing cover of the filterbox causes an airflow malfunction in the FAS-420-TM.