3367
5
GB
3.4
HYDRAULIC SYSTEMS
It is necessary to install a filter on the fuel supply line.
*
ONLY FOR ITALY
:
Automatic shut-off device as per Ministry of Internal Affairs’ regulation no 73 dated 7/29/71.
H
= difference of level;
L
= max. length of the suction line;
I. D.
= internal diameter.
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 possi-
bility of leakage of the valve.
H
meters
L meters
ø
i
8 mm
ø
i
10 mm
0.5
1
1.5
2
10
20
40
60
20
40
80
100
H
meters
L meters
ø
i
8 mm
ø
i
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
D5405
Fig. 8
Fig. 7
5 - 2nd stage pressure adjuster
6 - Suction gauge connection
7 - 2nd stage valve
8 - 1st stage valve
9 - Valve casing assembly
10 - Auxiliary pressure gauge
5
4
2
3
6
9
7
10
³
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.
³
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. 8).
WARNING:
1 - Suction line
2 - Return line
3 - By-pass screw
4 - Gauge connection
8
1
D5338
H
m
ax. 4
m
*
H
max
. 4 m
max
. 4 m
H
H
H
D5337
Fig. 9
Fig. 10
*
*
SYSTEM
NOT ALLOWED
IN GERMANY
