Technical data

DBW 2010 / 2012 / 2020 / 2022 / 300 / 350 8 Service Tasks
805
A conspicuous warning sign must be placed when a
closing mechanism has been installed in the return line.
ATTENTION
The operation of the return line of the device in closed
status will damage the fuel pump. The fuel could leak out.
That means fire danger.
The suspended fuel lines must be fixed to prevent
hanging.
The installation of an additional fuel pump is prohibited.
• The dimensions that are permitted for the fuel lines:•
The internal diameter for the suction and return: 6 mm
(other diameters can be used upon request)
• The maximum line length that is permitted for suction
and return: 10 m
• The maximum suction height that is permitted: 2 m
(the installation of bottom valve at maximum height
will be recommended)
• The maximum pre-pressure that is permitted: 0.3 bar
for the suction and return line
8.6.2.2 The fuel filter
A fuel filter delivered or permitted by Webasto must be
installed. The installation must be vertical as far as
possible and in that case the flow direction will be
horizontal. The filter or the filter elements must be
replaced at least once a year and more frequently if the
fuel is very dirty in order to prevent defects.
8.6.3 The supply of combustion air
ATTENTION
The compliance with the legal provisions is a must for the
installation (refer to 1.6).
The combustion air should never be taken from locations,
where people are present. The suction opening of the
combustion air should not be in the driving direction. It
must be placed in such way to prevent clogging as a
result of pollution and snow and to avoid the suction of
bouncing water.
The location of the entry of the combustion air and the
exit of the exhaust gas must be selected in such way that
no air pressure difference will be created in any function
status of the vehicle.
The dimensions that are permitted for the suction line of
the combustion air:
• Internal diameter: 55 mm
• The maximum line length that is permitted: 5 m
• The maximum bending that is permitted: 270
0
The combustion air entrance must be placed to prevent
the suction of the exhaust gas.
WARNING
In the case that the suction line for the combustion air
cannot be laid vertically, a water discharge hole with a
diameter of 4 mm must be drilled at the deepest place.
In the case that the heating device will be installed near
the fuel tank of the vehicle, in a common assembly
section, the combustion air must be sucked freely from
outside and the exhaust gas must be discharged outside.
The passage places must be manufactured to prevent the
passage of bouncing water.
In the case that the heating device is located in a closed
installation module, a combustion air opening will be
necessary.
DBW 2010/2012 20 cm
2
DBW 2010 / 2012 / 300 30 cm
2
DBW 350 35 cm
2
In the case that temperature in the installation module
exceeds the environmental temperature of the heating
device that is permitted (refer to the technical data), the
ventilation opening must be enlarged after counseling
with Webasto.
8.6.4 The exhaust line
ATTENTION
The legal provisions must be observed for the installation
(refer to 1.6)
The exit opening of the exhaust gas should not be in the
driving direction.
The opening at the exhaust exit should be located to
prevent being closed by snow and mud.
The location of the entry of the combustion air and the
exit of the exhaust gas must be selected in such way that
no air pressure difference will be created in any function
status of the vehicle.
The warnin
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