Webasto Thermo 230 Instructions De Montage page 56

Th23_EA_degbfr_g.book Seite 52 Dienstag, 15. Februar 2005 2:03 14
Fuel supply
7 Fuel supply
The fuel is taken from the vehicle fuel tank or from a separate fuel tank.
7.1. Fuel lines
Fuel lines are to be installed with a gradient wherever possible to
prevent air inclusions. Connections within the line are to be secured with
hose clips if no mechanical screw connectors are used.
If fuel hoses are used, the hoses supplied by or available from Webasto
must generally be used. If you do not use these hoses, the fuel hoses
that you do use must comply with DIN 73379. Fuel hoses must not be
kinked or twisted and must be secured with clips approx. every 25 cm.
Materials commonly used in automobile manufacture, e.g. steel and
plastic lines made of plasticized, light-resistant and temperature-
stabilized PA 11 or PA 12 (e.g. Mecanyl RWTL) as per DIN 73378 may
also be used for fuel lines taking into account the suitable connection
system in each case.
The following must be observed for the installation of fuel lines:
– The lines must be protected from the effects of high temperatures.
IMPORTANT!
The external casing on the heater may reach the ignition
temperature of diesel if it is operated without coolant.
– The lines must be protected from stone damage.
– Dripping or evaporating fuel must not be allowed either to
accumulate or to ignition hot parts or electrical equipment
It is not permissible to install a shut-off device in the return line!
IMPORTANT
Operation with a closed return line will damage the fuel pump.
Fuel may escape. Danger of fire!
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Unsupported fuel lines must be secured to prevent them sagging.
Do not install an additional fuel pump.
See pages 35 and 36 for the statutory regulations.
7.1.1.
– Internal diameter for intake and return line: 6 mm (other diameters to
order).
– Maximum line length for each intake and return line: 10 m
– Maximum intake height: 2 m (we recommend the installation of a foot
valve if the max. intake height is used)
– Max. permissible suction height: 2 m
– Max. permissible pressure in flow and return lines: 0.3. bar
7.2. Fuel filter
A fuel filter supplied or approved by Webasto must be used (check the
flow direction). To avoid malfunctions the filter or filter insert is to be
replaced before the start of the cold weather.
Thermo 230/231/300/301/350
Maximum dimensions of the fuel lines: