Riello G20D, Installation, Use And Maintenance Instructions

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13
2903397
GB
Hydraulic systems
6.1 Light oil supply

The burner is designed to allow entry of the hoses-lines on
either side of the burner.
6.1.1 Pump
The pump is designed to allow working with two pipes.
In order to obtain one pipe working it is necessary to unscrew the
return hose, remove the by-pass screw 3) and then screw the re-
turn plug 2).
Key (Fig. 10)
6 Hydraulic systems
Explosion danger due to fuel leaks in the pres-
ence of a flammable source.
Precautions: avoid knocking, attrition, sparks and
heat.
Make sure the fuel interception tap is closed be-
fore performing any operation on the burner.
WARNING
The fuel supply line must be installed by qualified
personnel, in compliance with current standards
and laws.
1 Suction line
2 Return line
3 By-pass screw
4 Gauge connection
5 2nd stage pressure
adjuster
6 Suction gauge connection
7 1st stage pressure adjuster
8 Auxiliary pressure test
point
9 2nd stage valve
10 1st stage valve
1 2
1
2
3
4
5
6
7
9 10
8
Fig. 10
D10987
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. 11.
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.