F i g . 4
D5912
2
3
4
7
6
5
18
Check periodically the flexible pipes conditions.
It is necessary to install a filter on the fuel supply line.
H = difference of level L = Max. lenght of the suction line I.D. = Interminal diameter of the oil pipes.
H
max. 4 m
min. 0.1 m
H
meters
L meters
I. D.
8 mm
I. D.
10 mm
0.5
1
1.5
2
10
20
40
60
20
40
80
100
H
meters
L meters
I. D.
8 mm
I. D.
10 mm
0
0.5
1
1.5
2
3
3.5
35
30
25
20
15
8
6
100
100
100
90
70
30
20
F i g . 5
F i g . 6
F i g . 7
PRIMING PUMP:
On the system in fig. 5 it is sufficient to loosen the suction gauge
connection (6, fig. 4) and wait until oil flows out.
On the systems in fig. 6 and 7 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 com-
pletely tight.
In the vacuum systems (fig. 7) 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.
D5741
D5740
max. 4 m
H
H
max. 4 m
H
H
D1842
WARNING
The pump is designed to allow working with one pipe.
In order to obtain two pipe working it is necessary to unscrew the
return plug (2), screw in the by-pass screw (3) and then screw in
return oil line (2). (See fig. 4).
In the two pipes systems, 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.
HYDRAULIC SYSTEM
1 - Suction pipe
2 - Return line
3 - By-pass screw
4 - Pressure gauge connection
& Bleed screw
5 - Pressure adjuster
6 - Vacuum gauge connection
7 - Valve
8 - Auxiliary pressure test point
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