Technical data

1 Introduction BBW 46 / DBW 46
102
The heater must not be installed in the passenger or driver
compartments of vehicles. Should the heater
nevertheless be installed in such a compartment, the
installation box must be sealed tight against the vehicle
interior. There must be sufficient ventilation of the
installation box from the exterior in order not to exceed a
maximum temperature of 60 °C in the installation box.
Excessive temperatures may cause malfunctions.
WARNING
Due to the danger of poisoning and suffocation the
heater must not be operated, not even with timer or
telestart, in enclosed areas such as garages or
workshops not equipped with an exhaust venting
facility.
At filling stations and fuel depots the heater must be
switched off as there is a potential danger of
explosion.
CAUTION
Where flammable fumes or dust may build up (e.g. in
the vicinity of fuel, coal, wood, cereal depots, or
similar installations) the heater must be switched off
to prevent explosions.
In the vicinity of the control unit a temperature of 85 °C
(storage temperature) must not be exceeded (e.g. during
body paint work). Excessive temperatures may cause
permanent damage to the electronics.
When checking the cooling water level proceed in
accordance with the vehicle manufacturer's instructions.
The water in the heating circuit of the heater must contain
at least 10% of a quality brand anti-freeze.
Non-authorised installations will void the heater's marks of
conformity and thus the vehicle's permit of operation. The
same applies to unskilled repairs or repairs not using
original spare parts.
1.5 Le
g
al Provisions for Installation
For testing the heater in accordance with §§ 19, 20, or 21
of the StVZO the following regulations are to be observed
in particular (§ 22 a StVZO):
Testing is performed upon presentation of the operating
and installation instructions of the manufacturer. The year
of the initial operation must be durably marked on the
heater identification plate by the installing person.
Extracting combustion air from the vehicle interior is
prohibited.
The exhaust line outlet is to be positioned to the top, to the
side, or in case of exhaust venting below the vehicle floor,
to the nearest possible location of the vehicle's or cockpit
side or rear end. Exhaust pipes must be routed so that
exhaust fumes are unlikely to penetrate into the vehicle's
interior. The function of any part of the vehicle essential
for operation must not be impaired.
Accumulations of condensate in the exhaust line must be
directly drained, if required a drain hole may be provided.
Installations fitted after March 18, 1993 must have a
combustion air inlet and exhaust outlet port, into which a
ball of 16 mm in diameter cannot be inserted.
Electrical wiring and heater switching and control gear
must be located in the vehicle so that its normal
functioning is not impaired under normal operating
conditions.
For the routing of fuel lines and the installation of
additional fuel tanks §§ 45 and 46 of the StVZO are to be
adhered to. The most important regulations are:
• Fuel lines are to be designed in such a way that they
remain unaffected by torsional stresses in the vehicle,
engine movement, and the like. They must be
protected against mechanical damage. Fuel-carrying
parts are to be protected against excessive heat and
are to be arranged so that any dripping or evaporating
fuel can neither accumulate nor be ignited by hot
components or electrical equipment.
• In busses fuel lines and fuel tanks may be located
neither in the passenger area nor in the driver's
compartment. In these type of vehicles the fuel tanks
must be located such that they do not pose a direct
hazard to the exits in the event of a fire. Fuel supply
must not be by means of gravity or pressurisation of
the fuel tank.
• Installation instructions for Webasto fuel tanks for fuel
supply of heaters in vehicles:
In busses the installation is not permitted in the
passengers or driver's compartment.
• The fuel filler neck must not be located in the
passenger’s or driver's compartment of any type of
vehicle.