5.10 Hydraulic Connections; 5.11 Gas Oil Supply - Riello PRESS GBW BIO Installation, Use And Maintenance Instructions

5.10 Hydraulic connections

NOTE:
The hydraulic circuit feeding system must be designed to
the indications provided in "Gas oil supply".
Remove the plugs from the suction and return pump connectors
and screw in the hoses, the connectors, and the gaskets provided
in their place as shown in (Fig. 16).
Do not twist the hoses during installation.
• The opening of the burner or the boiler door
must not twist or strain the hoses.
• Arrange the hoses in such way that they will
CAUTION
never be stepped on or contact hot boiler sur-
faces.
• Use two wrenches to screw in the hoses/nip-
ples: one to grip the hose connector and the
other to grip the nipple in order to apply the op-
posite force.

5.11 Gas oil supply

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
WARNING
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.
In case of use with gas oil containing up to 10%
Bio blend, it will be essential to use flexible oil
lines suitable for bio fuel use.
WARNING
Please contact Riello for further information.
It is strongly recommended a periodic check of
the pump pressure operation (annually or better
every six months, if the burner operation is contin-
DANGER uous).
You are advised to use additional filters on the fuel
supply line.
Riello recommends a good quality fuel filter at the
CAUTION tank (Fig. 17 - Fig. 18) and a secondary filter
(100  for gas oil) are used to protect the burner
pump and nozzle from contamination.
In case of Biodiesel use, pay attention to install
Biocompatible filters.
Installation
5.11.1 Double-pipe circuit
The burner is equipped with a self-priming pump which is capable
of feeding itself within the limits listed in the Tab. H.
There are three types of fuel hydraulic circuits:
• double-pipe circuits (the most common)
• single-pipe circuits
• loop circuits.
According to the burner/tank layout, either of two fuel supply sys-
tems can be used:
• siphon-type (with the tank higher than the burner);
• suction-type (with the tank lower than the burner).
19 GB
PUMP
D341
Fig. 16
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