Webasto DBW 2010 Workshop Manual page 10

DBW 2010 / 2016
5.3.4 Exhaust system
5.3.4.1 The exhaust outlet must be located so as to prevent
emissions from entering the vehicle through ventilators,
heated air inlets or opening windows.
5.3.5 Combustion air inlet
5.3.5.1 The air for the combustion chamber of the heater
must not be drawn from the passenger compartment of the
vehicle.
5.3.5.2 The air inlet must be so positioned or guarded that
blocking by rubbish or luggage is unlikely.
5.3.6 Heating air inlet
5.3.6.1 The heating air supply may be fresh or re-circulated
air and must be drawn from a clean area not likely to be con-
taminated by exhaust fumes emitted either by the propulsion
engine, the combustion heater or any other vehicle source.
5.3.6.2 The inlet duct must be protected by mesh or other
suitable means.
5.3.7 Heating air outlet
5.3.7.1 Any ducting used to route the hot air through the ve-
hicle must be so positioned or protected that no injury or
damage could be caused if it were to be touched.
5.3.7.2 The air outlet must be so positioned or guarded that
blocking by rubbish or luggage is unlikely.
5.3.8 Automatic control of the heating system
5.3.8.1 The heating system must be switched off automati-
cally and the supply of fuel must be stopped within five sec-
onds when the vehicle's engine stops running. If a manual
device is already activated, the heating system can stay in
operation.
ANNEX 7
ADDITIONAL REQUIREMENTS FOR COMBUSTION
HEATERS
7 Warning light
7.1 A clearly visible tell-tale in the operator's field of view
shall inform when the combustion heater is switched on or
off.
End of excerpt.
Additional information on and provisions for installation in
vehicles are contained in the installation instructions.
Extraction of the combustion air from the vehicle passenger
compartment is not permitted.
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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 vehi-
cle. Exhaust pipes must be routed so that no penetration of
the exhaust gases into the vehicle interior is to be expected.
The function of important parts of the vehicle must not be
adversely affected. Accumulated condensation in the exhaust
line must be discharged immediately. A condensate drain hole
may be drilled if necessary.
The openings of the combustion air inlet and exhaust air out-
let must be designed so that a ball with a 16 mm diameter
cannot be inserted.
The electric cables, controls and control units for the heater
must be arranged in the vehicle so that their proper function-
ing cannot be adversely affected in normal operating condi-
tions.
Compliance with §§ 45 and 46 of the German Road Vehicle
Licensing Act (StVZO) 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.
• With buses, fuel lines and fuel tanks must not be located
in the passenger or driver's area. Fuel tanks must be
positioned in these vehicles so that the exits are not
immediately endangered in case of fire. The fuel must not
be pumped into the fuel tank by gravity or gauge
pressure.
Installation regulations for Webasto fuel tanks for supplying
fuel to water 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.
• The fuel tanks must either be provided with a vent cap or
must be ventilated in another way (ventilation line).
Only caps may be used which comply with the standard DIN
73400.
All fuel tanks offered in the Webasto accessories catalogue
are suitable for a maximum operating pressure of 0.15 bar.
1 Introduction
103