13
2902812
GB
Hydraulic systems
6.1
Fuel supply
The burner is designed to allow entry of the hose-lines on either
side of the burner.
6.1.1
Pump
The pump is designed to allow working with one pipe.
In order to obtain two pipes working it is necessary to unscrew the
return plug 2)(Fig. 10), screw the by-pass screw 3),supplied as
burner equipment and then screw the return hoses.
6
Hydraulic systems
1 Suction
line
2 Return
line
3 By-pass
screw
4 Gauge
connection
5 Pressure
adjuster
6 Vacuum
gauge
connection
7 Valve
8 Auxiliary
pressure test point
2
1
3
4
5
6
7
8
D10934
Fig. 10
WARNING
Where gas oil containing bio diesel is in use, it is
recommended to avoid over oxygenation of the
blended fuels.
Where at all possible avoid the use of two pipe
systems where the circulated fuel is returned to
the tank.
If this cannot be avoided make sure that the return
pipe is normally below the surface of the fuel level
within the storage tank. See Fig. 13.
WARNING
The suction plug 1) is made of plastic. Once re-
moved, it must not be used again.
In single pipe installations, the plug in the return
line 2) must be totally in steel.
WARNING
In case of use with gas oil containing up to 30%
Bio blend, it will be essential to use flexible oil
lines suitable for bio fuel use.
Please contact Riello for further information.
DANGER
It is strongly recommended a periodic check of
the pump pressure operation (annually or better
every six months, if the burner operation is contin-
uous).
If the value is lower than 1 bar, compared to that
one of the initial setting, please check the cleaning
of the pump and line filters.
In case the pressure setting was not restorable,
please replace the pump, in order to guarantee
that the pump pressure during the pre-purge time
is at least 3.7 bar.
