Combustion Air Supply - Butler HL 90 Notice De Montage

HL90 EA_de_en_fr.book Seite 40 Freitag, 8. Oktober 2004 12:34 12

Combustion air supply

7 Combustion air supply
Under no circumstances may the combustion air be taken from areas
occupied by people. The combustion air intake opening must not point
in the direction of travel. It must be located so that it cannot become
clogged with dirt or snow and cannot suck in splashing water.
The combustion air intake line (internal diameter min. 30 mm) may be
up to 5 m in length and contain several bends totalling 360°. The
minimum bending radius is 45 mm.
NOTE:
If the combustion air intake line cannot be installed so that it slopes
downwards, a water drain hole with a diameter of 4 mm is to be made at
its lowest point.
If the heater is installed in a general installation space near the vehicle's
fuel tank, the combustion air must be taken in from the outside and the
exhaust fumes discharged into the atmosphere. The openings must be
splash-proof.
A ventilation opening measuring at least 10 cm
is installed in an enclosed box. The size of the ventilation opening must
be increased subject to consultation with Webasto if the temperature in
the box exceeds the permitted ambient temperature of the heater (see
Technical data).
7.1. Intake silencer
It is recommended for the intake silencer (order no. 198 56A) to be
installed in order to reduce intake air noise (Figure 10). This is placed on
the intake manifold.
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is required if the heater
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Figure 10: Intake silencer
7.2. Combustion air intake line
Length of combustion air intake line
With silencer:
Without silencer:
Internal diameter of the lines:
Minimum bending radius:
Total bends:
HL 90
max. 3 m
max. 5 m
30 mm
45 mm
max. 360°