Fuel Supply; Pump - Riello 40 G3RD MC Installation, Use And Maintenance Instructions

6.2

Fuel supply

 The burner is designed to allow entry of the hoses-lines on
either side of the burner.
6.2.1

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).
7
1
20052290
Key (Fig. 10)
1 Suction line
2 Return line
3 By-pass screw
4 Gauge connection
20163551
Hydraulic systems
6
5
4
3
2
5 1st stage pressure adjuster
6 Vacuum gauge connection
7 Auxiliary pressure test point
Where at all possible avoid the use of two pipe
systems where the circulated fuel is returned to
the tank.
WARNING
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.
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
WARNING
line 2) must be totally in steel.
It is strongly recommended a periodic check of the
pump pressure operation (annually or better every
six months, if the burner operation is continuous).
DANGER
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.
Fig. 10
12 GB