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Thermo 230/300/350
7
Fuel Supply
Fuel is extracted from the vehicle's fuel tank or from a separate fuel tank.
Fuel lines and filters must be completely vented without using the fuel
pump of the heater before commissioning. Thereby also during vehicle
operation a safe fuel supply without air bubbles must be ensured contin-
uously.
7.1.
Fuel Lines
When using fuel hoses, basically the hoses supplied or offered by
SPHEROS are to be used. If this is not the case, the fuel hoses must at
least comply with the requirements of DIN 73379. Fuel hoses must not
be kinked, crushed or twisted and must be secured at intervals of about
25 cm with clamps.
Materials commonly used in the construction of vehicles may be also
used for fuel hoses taking into account a suitable connection system in
each case. The selection should be done considering the ambient tem-
perature range.
To prevent air inclusions from forming in the fuel, the fuel lines should be
routed in an upward pitch, if possible. Connections within the fuel lines
must be secured by means of hose clamps unless mechanical screwed
connections are used.
ATTENTION:
If the heater is operated without coolant, the outer shell of the heat-
er may reach a temperature equalling the ignition temperature of
diesel fuel!
– The lines must be protected from stone damage
– any dripping or evaporating fuel must neither collect nor be ig-
nited by hot components or electrical equipment.
To prevent this, optionally a drip pan with defined drain holes is
to be installed in the area below the interface burner housing/
fuel line connectors/heat exchanger.
Note:
The fuel pump is delivered in series for a two-pipe system (with return
line).
The fuel pump can be ordered optionally for an appropriate heating
system or burner head also in a single-pipe version. In a single-pipe
system (without return line) according to the delivered application the
return line port at the housing is closed with a screw plug and a gasket
ring (see Fig. 18).
Bleeding is particularly in a single-pipe system mandatory and done
using a separate bleeding device according to the prescribed for this de-
vice procedure.
Fuel
Supply
Fig. 18: Fuel Return Plug Screw at a Single-Pipe System
Fuel Supply
Plug Screw
at Fuel
Return Port
51
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