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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. 8).
SYSTEM NOT PERMITTED
IN GERMANY
*
D5338
PRIMING PUMP:
On the system in fig. 7 it is
sufficient to loosen the suction gauge
connection (6, fig. 8) and wait until oil flows out.
On the systems in fig. 9 and 10 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.
: Automatic shut-off device as per Ministry of Internal Affairs' regulation no. 73 dated 7/29/71.
ONLY FOR ITALY
*
H = difference of level;
2334
All manuals and user guides at all-guides.com
H
meters
Fig. 7
0.5
1
1.5
2
1 - Suction line
2 - Return line
3 - By-pass screw
4 - Gauge connection
5 - 2 nd stage pressure adjuster
Fig. 9
L = max. length of the suction line;
8
L meters
ø i
ø i
8 mm
10 mm
10
20
20
40
40
80
60
100
Fig. 8
*
4
GB
S7067
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
L meters
H
ø i
meters
8 mm
0
35
0.5
30
1
25
1.5
20
2
15
3
8
6
3.5
Fig. 10
I. D. = internal diameter.
ø i
10 mm
100
100
100
90
70
30
20
D5337
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