Fuel Supply - Spheros Thermo 230 Notice De Montage

Fuel Supply

7 Fuel Supply
Fuel is extracted from the vehicle's fuel tank or from a separate fuel tank.
Thereby also during vehicle operation a continuous fuel supply must be
ensured.
7.1. Fuel Lines
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.
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,
as a minimum, comply with the requirements of DIN 73379. Fuel hoses
must neither be kinked nor twisted and must be secured by clamps
spaced approx. 25 cm apart.
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.
IMPORTANT:
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
50
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.
Bleeding is particularly in a single-pipe system mandatory:
a) With a separate bleeding device according to the prescribed for
this device procedure!
b) While the fan motor is running (initial cycle/purge cycle), loosen
the screw plug, ident. no. 149314Z, and hold open until the fuel
comes out nearly free of air bubbles (collect fuel with a container).
Then close screw plug, torque to 16 +/-1 Nm.
Refer also to the workshop Manual for further notes on fuel system
bleeding!
IMPORTANT:
The operation with a closed return line will cause damage to the
fuel pump, fuel can leak out - fire hazard!
Unsupported fuel lines must be secured to prevent them from sag-
ging.
The installation of an additional fuel pump is not permitted.
For legal provisions refer to pages 35 and 36.
Thermo 230/300/350