7
2902936
GB
3.4 HYDRAULIC SYSTEMS
It is necessary to install a filter on the fuel supply line.
◆
The pump is designed to allow working with two pipes.
◆
Before starting the burner make sure that the return pipe-line is
not clogged. An excessive back pressure (
≥
1 bar) would cause
the damage 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 torque of 0.5 Nm.
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 7
÷
15 bar.
Do not loosen the knob (8) and periodically check that it is
firmly fixed, for safety reasons.
Pressurised systems have a positive fuel pressure 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.
Figure 12 is an example of connection to a pressurised ring, no matter
what position the ring feeder tank is in.
In the system in fig. 11, 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.
PRIMING PUMP
it is sufficient to loosen the suction gauge connection (6, fig. 10) and wait until oil flows out.
D5912
1 - Suction line
2 - Return line
3 - By-pass screw
4 - Gauge connection
5 - Pressure adjuster
6 - Suction gauge connection
7 - Valve
8 - Knob
1
7
4
3
2
5
6
8
Fig. 10
PUMP
(see fig. 10)
PRESSURISED ONE PIPE SYSTEMS
(fig. 11 and 12)
H
m
a
x
.
4
m
D7006
H
meters
L meters
I. D.
8 mm
I. D.
10 mm
0.5
1
1.5
2
10
20
40
60
20
40
80
100
●
●
ONLY FOR ITALY:
Automatic shut-off device as per Ministry of Internal Affairs’ regulation no. 73 dated 7/29/71.
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.
H = difference of level; L = max. length of the suction line; I. D. = internal diameter of the oil pipes.
●
D7007
Fig. 11
Fig. 12
SYSTEM NOT PERMITTED
IN GERMANY
