Riello Gulliver BG7D Installation, Use And Maintenance Instructions page 70

3.5 HYDRAULIC SYSTEMS
WARNING
Before starting the burner make sure that the return pipe-line is not
clogged. An excessive back pressure would cause the damage of
the pump seal.
The pump is designed to allow working with two pipes. In order to
obtain one pipe working it is necessary to unscrew the return plug
(2), remove the by-pass screw (3) and then screw again the plug
(2). (see fig. 8).
SYSTEM NOT PERMITTED
IN GERMANY
*
D5414
PRIMING PUMP
On the system in fig. 9 it is sufficient
to loosen the suction gauge connection
(6, fig. 8) and wait until oil flows out.
On the systems in fig. 10 and 11 start the burner and wait for the priming.
Should lock-out occur prior to the arrival of the fuel, await at least 20 seconds
before repeating the operation.
The pump suction should not exceed a maximum of 0.4 bar (30 cm Hg).
Beyond this limit gas is released from the oil. Oil pipes must be completely tight.
In the vacuum systems (fig. 11) the return line should terminate within the oil
tank at the same level as the suction line. In this case a non-return valve is not
required. Should however the return line arrive over the fuel level, a non-
return valve is required.
This solution however is less safe than previous one, due to the possibility of
leakage of the valve.
*
It is necessary to install a filter on the fuel supply line.
*
ONLY FOR ITALY : Automatic shut-off device as per Ministry of Internal Affairs' regulation no. 73 dated 7/29/71.
H = difference of level;
3066
meters
Fig. 9
Fig. 10
L = max. length of the suction line;
Fig. 8
L meters
H
I. D. I. D.
8 mm 10 mm
0.5 10 20
1 20 40
1.5 40 80
2 60 100
1 - Suction line
2 - Return line
3 - By-pass screw
4 - Gauge connection
5 - 2 nd stage pressure
adjuster
I. D. = internal diameter of the oil pipes.
7
GB
4
6 - Suction gauge connection
7 - 1 st stage pressure adjuster
8 - Pressure reducer piston
9 - 2 nd stage valve
10 - 1 st stage valve
11 - Auxiliary pressure test point
L meters
H
I. D.
meters
8 mm
0 35
0.5 30
1 25
1.5 20
2 15
3 8
3.5 6
*
S7067
I. D.
10 mm
100
100
100
90
70
30
20
Fig. 11
D5415