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3.3 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 nut (2), remove the
by-pass screw (3) and then screw again the nut (2).
(See fig. 7).
SYSTEM NO T PERMITTED
IN GERMANY
Fig. 6
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 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.
H = difference of level;
2304
H
meters
8 mm
0.5
1
1.5
2
D5703
Fig. 8
L = max. length of the suction line;
4
GB
8
1
2
3
4
L meters
1 - Suction line
2 - Return line
I. D.
I. D.
3 - By-pass screw
10 mm
4 - Gauge connection
5 - Pressure adjuster
10
20
20
40
6 - Suction gauge connection
40
80
7 - Valve
60
100
8 - Auxiliary pressure gauge
Fig. 7
D5487
5
6
L meters
H
I. D.
I. D.
meters
8 mm
10 mm
0
35
100
0.5
30
100
100
1
25
1.5
20
90
2
15
70
3
8
30
3.5
6
20
Fig. 9
D5705
I. D. = internal diameter.
7
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