2.
The ventilation unit has been protected by an
outer casing (by others). Access to the outer
casing has to be provided for any work.
Checking and changing extract air and outdoor air
filters
3.
Depending on the unit variant you may have to
remove the inspection access panel or the filter
cover,
Pull out extract air and outdoor air filters.
4.
Check the filters for damage, contamination and
deposits.
5.
Remove contamination in the ventilation unit with
a commercially available vacuum cleaner.
6.
If a filter is intact, free of contamination and
deposits, and if it has been used for less than
1 year, put it back into the filter chamber.
If a filter has already been used for a year or if it
does no longer meet the technical or hygiene
requirements, replace it.
When you insert a new filter, make sure that
the labelling at the front of the filter remains
visible.
Once inserted, each filter must be flush with
the surface as otherwise air will bypass the
filter.
7.
Fix the filter cover or the inspection access panel
again (depending on unit variant).
8.
Switch on the power supply.
9.
If the filter operating hours counter in FSL
‑
CON-
TROL III has been used, reset it after a filter
change
Ä
Installation and configuration manual
FSL
‑
CONTROL III.
ð
Filter checking or filter change is complete.
Dispose of used filters with residual waste.
Maintenance and cleaning
Maintenance > Checking and replacing the filters
Decentralised ventilation units Under sill units
36
