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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 dam-
age 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).
SYSTEM NOT 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;
2305
L meters
H
ø i
meters
8 mm
0.5
10
1
20
1.5
40
2
60
1 - Suction line
2 - Return line
3 - By-pass screw
D5703
4 - Gauge connection
5 - 2 nd stage pressure adjuster
Fig. 8
L = max. length of the suction line;
4
GB
8
ø i
10 mm
20
40
80
100
Fig. 7
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 gauge
H
meters
0
0.5
1
1.5
2
3
3.5
I. D. = internal diameter.
S7067
L meters
ø i
ø i
8 mm
10 mm
35
100
30
100
25
100
20
90
15
70
8
30
6
20
Fig. 9
D5705
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