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6
Hydraulic system
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
WARNING
line
6.1
Pump
The pump (Fig. 9) is designed to allow 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 the by-pass screw 3)
and then screw again the plug 2) with a tightening torque of
0.5 Nm.
The suction plug 1) is made of plastic.
Once removed, it must not be used again.
In one-pipe installations, the plug in the return line
WARNING
2) must be totally in steel.
The pump has a delivery pressure regulation device 5). Pressure
increases if turned in a clockwise 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.
Do not loosen the knob 9) and periodically check
that it is firmly fixed, for safety reasons.
WARNING
8
1
1
Suction line
2
Return line
3
Screw for by-pass
4
Pressure gauge attachment
5
Pressure governor
Hydraulic system
9
7
5
6
4
3
2
D9630
6
Suction gauge connection
7
Valve
8
Auxiliary pressure gauge
9
Knob
6.2
Pressurised one pipe systems
Pressurised one pipe systems (Fig. 10) have a positive fuel pres-
sure on intake to the burner.
Usually the tank is higher than the burner, or the fuel pumping
systems are on the outside of the boiler.
SYSTEM ONLY FOR ITALY:
Automatic shutoff device as per DM 28/4/2005.
H
meters
0,5
1
1.5
2
H
= difference of level;
L
= max. length of the suction pipe;
Ø i
= internal diameter of the oil pipe.
The installer must ensure that the supply pressure
is not above 0.5 bar.
Above that level, the pump seal is subject to too
WARNING
much stress.
In the system in Fig. 10, 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. 9) and
wait until oil flows out.
Fig. 9
13
GB
SYSTEM NOT PERMITTED
IN GERMANY
D6328
L meters
Øi
Øi
8 mm
10 mm
10
20
20
40
40
80
60
100
Fig. 10
20013962
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