Webasto Air Top 3500 ST D Workshop Manual - page 7
1 Introduction
Air Top 3500/5000 ST
102
2.2.2. The internal combustion heater must not pose a fire
hazard even when overheated. This requirement is
deemed to have been met if care is taken during
installation to ensure an adequate distance from all
parts, as well as adequate ventilation and if fire-
resistant materials or heat shields are used.
2.2.3. In class M2 and M3 vehicles the heater must not be
installed in the passenger cabin. A device in a
sealed cover, which also meets the requirements
set out in paragraph 2.2.2, may be used, however.
2.2.4. The plate mentioned in paragraph 1.4 (model plate)
or a duplicate thereof (duplicate model plate) must
be fitted in such a way that it is still clearly legible
when the heater has been installed in the vehicle.
2.2.5. When positioning the heater, all reasonable
precautions must be taken to minimise the risk of
personal injury or damage to items in the vehicle.
2.3. Fuel
supply
2.3.1. The fuel filler neck must not be located in the
passenger compartment and must have a tightly
fitting cap to prevent any fuel leaks.
2.3.2. The type of fuel and the fuel filler neck must be
clearly identified on heaters for liquid fuel, for which
the fuel supply is separate from the fuel supply for
the vehicle.
2.3.3. A sign must be affixed to the fuel filler neck warning
that the heater must be switched off before
refuelling. An identical warning must also be
included in the manufacturer's operating
instructions.
2.4. Exhaust
system
2.4.1. The exhaust outlet must be positioned in such a
way that exhaust fumes cannot get into the interior
of the vehicle through ventilation devices, hot-air
inlets or open windows.
2.5. Combustion air inlet
2.5.1. The air for the combustion chamber of the heater
must not be extracted from the passenger cabin of
the vehicle.
2.5.2. The air inlet must be positioned in such a way that
it cannot be obstructed by other objects.
2.6. Hot air inlet
2.6.1. The supply of heating air must consist of either
fresh air or recirculated air and must be taken from
a clean area which cannot be contaminated by
exhaust fumes from the engine, the internal
combustion heater or any other source in the
vehicle.
2.6.2. The inlet line must be protected by a grating or other
suitable means.
2.7. Hot air outlet
2.7.1. Hot air lines within the vehicle must be positioned or
protected in such a way as to exclude all risk of
injury or damage caused by direct contact.
2.7.2. The air outlet must be positioned or protected so
that it cannot be obstructed by other objects.
2.8.
Automatic control of the heating system
When the engine stops, the heating system must
cut out automatically and the fuel supply must be
stopped within 5 seconds.
The heating system may remain in operation if a
manual unit has already been activated.
1.4.2 General safety information
The mouth of the exhaust pipe should be installed
upwards, to the side or, if the exhaust pipe passes under
the floor of the vehicle, to the side or rear limit of the
driver’s cab or the vehicle.
The function of important parts of the vehicle must not be
adversely affected. It must not be possible for condensate
or water to collect in the exhaust pipe. Drain holes may be
used.
The electric cables and controls for the air-conditioning
system must be arranged in the vehicle so that their
proper functioning cannot be adversely affected in normal
operating conditions.