20011755
12
GB
Hydraulic system
6.1
Pump
The pump (Fig. 8) is d esigned to all ow working with two
pipes.
In the two pipes systems, before starting the burner make
sure that the return pipe-line is not clogged.
An excessive back pressure (
1 bar) would cause the dam-
age of the pump seal, with subsequent fuel leaks inside the
burner.
In order to obtain one pipe working it is necessary to
unscrew the return plug 2), remove th e by-pass scre w 3)
and then screw again the plug 2) with a tightening torque of
0.5 Nm.
The pump has a delivery pressure regulation device 5). Pressure
increases if turned in a clo ckwise direction, and decreases if
turned in the other direction.
An indication of sensitivity is 1 bar per turn. The pressure can be
regulated in a range of 8 - 15 bar.
1
Suction line
2
Return line
3
Screw for by-pass
4
Pressure gauge attachment
5
Pressure governor
6
Suction gauge connection
7
Valve
8
Knob
6.2
Pressurised one pipe systems
Pressurised one pipe systems (Fig. 9 and Fig. 10) have a posi-
tive fuel pressure on intake to the burner. Usually the tank is high-
er than the burner, or the fu el pumping systems are on the
outside of the boiler.
Fig. 10 is an example of connection to a pressurised ring, no mat-
ter what position the ring feeder tank is in.
SYSTEM
ONLY FOR ITALY
:
Automatic shutoff device as per Ministry of Internal Affairs’ regu-
lation no. 73 dated 7/29/71.
H
= difference of level;
L
= max. length of the suction pipe;
ø
i
= internal diameter of the oil pipe.
In the system in Fig. 9, the table shows the maximum indicated
lengths for the supply line, depending on the difference in level,
length and the diameter of the oil pipes.
6.2.1
Pump priming
It is sufficient to loosen the vacuometer connection 6) (Fig. 8) and
wait until oil flows out.
6
Hydraulic system
WARNING
The burner is designed to allow installation of the
oil-lines on either side of the burner.
It is necessary to install a filter on the fuel supply
line
WARNING
Do not loosen the knob 8) and periodically check
that it is firmly fixed, for safety reasons.
D5912
1
7
4
3
2
5
6
8
Fig. 8
H
meters
L meters
Øi
8 mm
Øi
10 mm
0,5
10
20
1
20
40
1.5
40
80
2
60
100
WARNING
The installer must ensure that the supply pressure
is not above 0.5 bar.
Above that level, the pump seal is subject to too
much stress.
ma
x. 4
m
D9344
SYSTEM NOT PERMITTED
IN GERMANY
Fig. 9
H
D9343
Fig. 10
