Webasto Air Top Evo 3900 Workshop Manual page 9

Air Top Evo 3900/5500
Compliance with §§ 45 and 46 of the Road Vehicle
Licensing Act must be ensured for the installation of fuel
lines and the installation of additional fuel tanks.
The main points from this law:
– Fuel pipes must be designed in such a way that
torsion in the vehicle, movements by the engine and
the like do not have a negative effect on their
durability.They must be protected from mechanical
damage.
– Parts that carry fuel must be protected from heat that
will adversely affect their function and positioned so
that dripping or evaporating fuel cannot collect or
ignite on hot parts or on electrical equipment.
The air heater's heat exchanger can be used for a
maximum of 10 years and must then be replaced by the
manufacturer or one of its authorised workshops using a
genuine spare part. A label must then be affixed to the
heater showing the date of sale and the wording "Genuine
spare part".
When you change the heat exchanger it is essential that
you also replace the overheating protection element
(temperature sensor) to prevent possible function faults
caused by using the old temperature sensor.
The Air Top Evo 3900 and Air Top Evo 5500 air heaters
are prepared for interior installation and sealing direct on
the cabin floor or a cabin wall. Non-release connections
must be used in the interior for combustion air and
exhaust pipes with the accessories available from
Webasto.
The seal between the heater mounting and the vehicle
floor must always be installed, otherwise harmful
emissions may get into the interior of the vehicle.
The hot and combustion air intake openings must be
positioned in such a way that no water can ingress into
them if the vehicle drives through a water hazard for which
it has been approved.
The heater must not be installed in the driver's or
passenger cabin of buses (vehicle classes M
the heater is nevertheless installed in such a place, the
installation box must be tightly sealed against the vehicle
interior.The installation box must have sufficient external
ventilation to ensure that a maximum temperature of 40
°C is not exceeded in the box. Fault faults may occur if the
temperature exceeds this level.
The heater must be switched off at filling stations and tank
farms as a result of the risk of explosion.
Wherever inflammable vapours or dust may form (for
example in the vicinity of fuel, carbon, wood dust or cereal
stores or the like), the heater must be switched off as a
result of the risk of explosion.
The heater must not be operated in enclosed areas such
as garages and workshops without an emissions
extraction system, even if you use the timer, because of
the risk of asphyxiation and poisoning.
In the event of lengthy heavy smoke development,
unusual combustion noise or a smell of fuel, the heater
must be put out of action by removing the fuse and must
not be started again until it has been examined by
Webasto-trained personnel. Claims can only be made if it
can be verified that the claimant has complied with the
servicing and safety instructions.
Installation regulations for Webasto fuel tanks for
supplying fuel to heaters in vehicles:
• The tank must not be installed in the passenger or
driver's cabin of buses.
• The fuel filler neck must not be inside the passenger
or driver's cabin in any vehicle.
• Fuel tanks for normal and super grades of petrol must
not be immediately behind the front trim of the
vehicle.They must be separated from the engine in
such a way that in the event of an accident the fuel will
not be expected to ignite.This does not apply to tractor
units with an open driver's seat.
The fuel lines (Mecanyl hose) must not be immediately
next to the exhaust pipe and must be thermally insulated
if necessary, otherwise they will pose a fire risk.
All pipes that come into contact with fuel must have sealed
connections, they must not be damaged in any way and
the must be checked at regular intervals (at least the
same intervals as an inspection of the vehicle as a whole).
If any damage or leaks are found on the fuel line, the
heater must not be used until the damage has been
and M ). If rectified by an authorised Webasto workshop.
2 3
Put the heater out of action by removing the fuse.
1 Introduction
NOTE
103