Fig. 802 Fuel Filter, Installation Position And Flow Direction; Fig. 803 Permissible Installation Position Of Exhaust Silencer; Combustion Air System - Webasto Air Top Evo 40 Workshop Manual

Air Top Evo 40 / Air Top Evo 55
8.6.2.2 Fuel filter
If soiled fuel is to be expected, a suitable fuel filter (e.g. We-
basto fuel filter) must be installed. Install vertically if possible,
however at least horizontally (see Fig. 802).
Observe installation position and flow direction.
Fig. 802 Fuel filter, installation position and flow
direction

8.6.3 Combustion air system

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.
With petrol heaters, the combustion air must be extracted
with a combustion air line at a position that is as cool as pos-
sible and protected from splashing water. If the heater is in a
sealed installation box, the combustion air must be drawn in
from the outside and the emissions fed to the outside. Pipe
passage holes must be made in such a way as to ensure that
the ingress of exhaust fumes into the interior of the vehicle
should not occur.
If soiled combustion air is to be expected, a combustion air
filter can be installed (only Air Top Evo 40 D /Air Top Evo
55 D). An intake silencer must be used for an intake hose
length of < 0.5 m.
8.6.4 Exhaust system
The exhaust line must be secured on the heater and on the
exhaust silencer with a clamp suitable for the exhaust line.
It must be ensured that the exhaust silencer (Fig. 803) is not
the lowest part of the exhaust-gas routing and that it is in-
stalled near the heater.
The flow direction is arbitrary.
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NOTE:
0° - 90°
NOTE
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The heater may also be operated without an exhaust silencer.
Fig. 803 Permissible installation position of exhaust
silencer
Any desired flow direction
8.6.5 Combustion air inlet and exhaust lines
To avoid damage to the fuel pump cable, it must be ensured
that the combustion air intake and exhaust lines are not con-
fused. The exhaust line must be attached to the exhaust out-
let fitting.
Length of the combustion air intake and exhaust lines:
with silencer:
without silencer:
Both lines are to be installed falling away from the heater. If
this is not possible, a condensate drain hole with a diameter
of 4 mm must be made at its lowest point or a connection el-
ement with a condensate drain must be used.
Internal diameter of the lines:
Combustion air line:
Exhaust line:
If the exhaust line is 2 m or more, insulated exhaust lines must
be used (to prevent the temperature falling below the dew
point).
Minimum bending radius: 50 mm
Total bends:
Combustion air line:
Exhaust line:
An attachment is required no further than 150 mm from the
end of the exhaust pipe to ensure that an angle of 90° ± 10°
is achieved.
Service Work
NOTE
max. 2.0 m
max. 5.0 m
25 mm
24 mm
NOTE
max. 270°
max. 270°
803