1955
4
GB
3.3
HYDRAULIC SYSTEMS
It is necessary to install a filter on the fuel supply line.
H
= difference of level;
L
= max. length of the suction line;
I. D.
= internal diameter of the oil pipes.
PRIMING PUMP:
On the system in fig. 6 it is sufficient to loosen the suction gauge
connection (6, fig. 7) and wait until oil flows out.
On the systems in fig. 8 and 9 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. 9) 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.
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
SYSTEM NOT PERMITTED
IN GERMANY
1 - Suction line
2 - Return line
3 - By-pass screw
4 - Gauge connection
5 - Pressure adjuster
6 - Suction gauge connection
7 - Valve
8 - Auxiliary pressure test point
H
max.
4 m
max.
4 m
H
H
H
D5734
Fig. 8
Fig. 9
Fig. 6
H
max.
4 m
D5733
■
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. 7).
WARNING:
1
3
2
4
8
7
6
Fig. 7
D5487
5
