User's Manual

1INTRODUCTION T HERMO 90 / 90 S
1-2
Ignoring the installation instructions and its procedures
will void the warranty granted by Webasto. The same
applies for repairs preformed by unskilled, unauthorized
personnel and repairs without using genuine Webasto
spare parts. This will void the coolant heaters “Official
Marks of Conformity.”
Extracting combustion air from the vehicle interior is not
permissible under any circumstance.
The exhaust line outlet is to be positioned 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 will not penetrate into
the vehicle’s interior.
The function of any parts vital for vehicle operation must
not be impaired. Condensation accumulation in the
exhaust line must be directly drained. A condensation
drain hole may be provided as required.
Electrical lines, switch gear, and control gear of the
heater must be located in the vehicle so that their proper
function cannot be impaired under normal operating
conditions.
For the routing of fuel lines and the installation of
additional fuel tanks, the following important regulations
must be adhered to:
• Fuel lines are to be installed in such a way that they
remain unaffected by torsional stresses created by
vehicle and engine movement. They must be
protected against mechanical damage.
Fuel-carrying parts are to be protected against
excessive heat and are to be installed 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 must not be
located in the passenger area or 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
pressurization of the fuel tank.
• Installation instructions for Webasto fuel tanks for the
fuel supply of coolant heaters in vehicles:
In busses the installation is not permitted in the
passenger or driver’s compartment.
• The fuel filler neck must not be located in the
passengers or driver’s compartment of any vehicle.
• Fuel containers for gasoline fuel must not be
located immediately behind the front paneling of the
vehicle. They must be separate from the engine so
that even in the case of accident the inflammation of
fuel is unlikely to be expected.
This does not apply for towing vehicles with an open
cockpit.
All fuel containers offered in the Webasto
Accessories Catalog are suitable for a maximum
operating pressure of 0.15 bar over-pressure.
All fuel containers offered in the Webasto
Accessories Catalog are subjected during
manufacture to individual pressure testing with at
least 0.3 bar over-pressure.
• The fuel containers must either be equipped with a
vent cap or be ventilated in another way
(ventilation line). Only filler caps in accordance with
DIN 73400 may be used.
• The operational state of the heater, i.e. an indication
“on” or “off”, must be clearly visible.