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Manual_S5_Airplus_2015_04_20 Page 48 / 68
© Wodtke GmbH - Tübingen. All Rights and Changes Reserved.Printed 04/2015 Part No. 950 976
16.7 Inspection and Cleaning of
Air Volume Sensor and Air In-
take
Important notice: If an external combustion air
line is connected to the unit, this line should first
be visually inspected over the entire length for
clogs before inspecting the air intake pipe and
air volume sensor, so that it is ensured that suf-
ficient combustion air can even be supplied to the
air intake pipe/air volume sensor of the unit. Any
clogs or deposits (e.g. dust balls) must be com-
pletely removed.
Combustion air lines should be arranged so
that their openings outside the building are
protected against wind pressure.
For removal of the air volume sensor (LMS),
the rear bottom panel must first be removed.
The air volume sensor can then be removed
from the unit and visually inspected and care-
fully cleaned of dust and contaminants with a
paint brush if necessary.
Attention:
Never clean air volume sensor with scouring
brushes, etc. This would destroy the sensor's
electronics.
Always remove air volume sensor (LMS) com-
pletely with the carrier plate. To do so, remove the
two hex screws (Fig. 93 item 1)
Do not remove the small screws which secure the
air volume sensor (circuit board) to the carrier
plate.
Attention:
When reinstalling, note the flow direction (arrow in
Fig. 93), as otherwise incorrect measurements
can occur! Install air volume sensor as shown, with
the carrier plate on the left.
Fig. 93: air volume sensor screw connections
Sooted or burned air volume sensors indicate on-
site installation defects (e.g. negative pressure) or
a lack of cleaning/maintenance and must be re-
placed. The on-site defects must first be resolved,
as otherwise the new LMS will be immediately
damaged as well.
If the LMS was heavily soiled / contaminated, it
is also recommended that the air intake pipe
be inspected for contamination and cleaned so
that the combustion air can flow without dis-
ruption. To do so, the aluminium flex hoses must
be disconnected and the air intake pipe removed
from the holder.
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