Webasto Air Top 3500 Installation Instructions Manual page 4

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Air Top 3500/5000
hicle through a sealed bush.
The heat exchanger, the connected exhaust pipe as well
as any drain pipe that may be connected must be so
sealed that in the event of an overpressure equivalent to
the twofold overpressure of the exhaust gas at maximum
permissible exhaust pipe length – however, at a minimum
overpressure of 0.5 mbar – a leakage rate of a total of 30
l/h is not exceeded.
The pipe including lead-through, joints, material and type
of construction must be specified in the installation instruc-
tions.
Mounting and removal of the pipe must be possible with
tools only, it must be protected against damage and be per-
manently vibration-proof.
Only metal pipes may be used. These must not exceed a
temperature of 110 °C if the possibility of accidental con-
tact in the vehicle's interior exists. It is permissible to install
a protection against accidental contact.
"Combustion Air Inlet" and "Exhaust Gas Outlet":
During installation it must be ensured that the openings of
the combustion air inlet and exhaust gas outlet pipes are
so designed that a spherical object of 16 mm diameter can-
not be introduced.
Electric lines, switchgear and controlgear of the heater
must be so arranged in the vehicle that their functioning
cannot be impaired under normal operating conditions.
All tubes leading from the heater toward the outside must
be routed through splashwater-proof openings.
In the case of buses, the heater must be installed neither
in the driver's compartment nor in the passenger area.
For the routing of fuel lines and the installation of additional
fuel tanks, articles 45 and 46 StVZO are to be adhered to.
The most important excerpts therefrom are as follows:
Fuel lines are to be designed in such a way that their sta-
bility remains unaffected by torsional stresses in the ve-
hicle, engine movement and the like. They must be pro-
tected against mechanical damage. All parts of the fuel sys-
tem must be protected against heat which would impair
2
their operation, and must be located such that dripping or
evaporating fuel can neither collect nor be ignited by hot
components or electrical equipment.
In the case of buses, fuel lines and fuel tanks may be lo-
cated neither in the passenger area nor in the driver's com-
partment. In these 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. The fuel must not be supplied by means
of gravity or gauge pressure in the fuel tank.
Mounting instructions for Webasto fuel tanks for fuel sup-
ply of heating units in vehicles:
In the case of buses, installation must not be performed in
the passenger area or in the driver's compartment.
The fuel filler neck must not be located inside the pas-
senger area or the driver's compartment in any vehicle.
Petrol fuel tanks must not be located directly behind the
front panelling of the vehicle.
They must be separated from the engine in such a manner
that the possibility of fuel inflammation is remote even in
the event of an accident. This does not apply to tractor ve-
hicles with open cabs.
The operating state of the heater at any given time – i.e. at
least whether it is on or off – must be easily recognizable.
Webasto will not assume any liability if the installation in-
structions and the notes contained therein are not ob-
served. The same applies to improperly performed repairs
or those where others than genuine replacement parts
have been used. In those cases, the heater's General De-
sign Certification and thus the vehicle's General Operating
Permit (homologation) will be invalidated as a conse-
quence.
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