Fuel Supply
Thermo E 200/320
48
8
Fuel Supply
Fuel is extracted from the vehicle's fuel tank or from a separate fuel tank.
It must be ensured that the fuel is supplied clean and without bubbles.
8.1.
Fuel Lines
To prevent air inclusions in the fuel, the fuel lines should be routed in an
upward pitch, if possible. Line connections within the plumbing must be
secured by means of hose clamps unless mechanical screwed connec-
tions are used.
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.
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. During selection or dimensioning of the fuel lines it must be
considered wether the affected line system is operated in overpressure
or low pressure conditions. The selection should be done considering
the ambient temperature range.
Fuel hoses must neither be kinked nor twisted and must be secured by
clamps spaced approx. 25 cm apart.
ATTENTION!
–
If the heater is operated without coolant, the outer shell of the
heater may reach a temperature equalling the ignition tem-
perature 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, if necessary, a drip pan with defined drain holes is to be in-
stalled in the area below the interface burner housing/fuel line
connectors/heat exchanger.
– Unsupported fuel lines must be secured to prevent them from
sagging.
– The installation of an additional fuel pump is not permitted.
– For legal provisions refer to pages 33 and 34.
8.1.1.
Permissible dimensions of the fuel lines
– Inside diameter for suction and return lines: 6 mm (other diameters
on request).
– Max. permissible length of each suction and return line: 15 m
– Max. permissible suction height: 1 m
– Max. permissible admission pressure: 0,3 bar
– Differing fuel supply systems are permitted if the negative pressure
in the suction line directly before the heater 500 mbar not exceeds.
– If a check valve is installed in the supply line, its opening pressure
must not exceed 70 mbar.
8.2.
Fuel Filter
A by Speros approved fuel filter is to be used. Consider absolutely the
marked flow direction. To avoid malfunctions the filter or filter insert is to
be replaced annually before the cold weather season starts.
