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5.13.3 Pressure adjustment
The pump leaves the factory set at 12 bar.
If necessary, recalibrate the pressure using the screw 5)
(Fig. 17).
5.13.4 Pressurised one-pipe systems
Pressurised one-pipe systems (Fig. 18) 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.
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 the
plug 2) in again with a tightening torque of 0.5 Nm.
H
metres
0.5
1
1.5
2
H
= Difference of level
L
= Maximum suction line length
Ø
= Inner diameter of the 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. 18, the table shows the maximum approxi-
mate lengths for the supply line, depending on the difference in
level, length, and the diameter of the fuel conduit.
5.13.5 Priming pump
In the system of Fig. 18 just loosen the connection of the vacuom-
eter 6) and wait for the fuel to come out.
In the systems A and B of Fig. 19 start the burner and wait for the
priming. Should lockout occur prior to the arrival of the fuel, await
at least 20 seconds before repeating the operation.
The pump vacuum should not exceed a maximum of 0.4 bar (30
cm Hg).
Beyond this limit gas is released from the oil.
The pipes must all be perfectly sealed.
WARNING
D6328
L metres
Ø (8 mm)
Ø (10 mm)
10
20
20
40
40
80
60
100
Installation
5.13.6 Vacuum systems
Vacuum systems (Fig. 19 and Fig. 20) have a negative fuel pres-
sure (depression) on intake to the burner. Usually the tank is low-
er than the burner.
Fig. 18
Tab. E
The installer must ensure that the supply de-
pression never exceeds 0.4 bar (30 cm Hg).
Beyond this limit gas is released from the oil.
WARNING
The pipes must all be perfectly sealed.
H
metres
0
0.5
1
1.5
2
3
3.5
H
= Difference of level
L
= Maximum suction line length
Ø
= Inner diameter of the pipe
19
GB
L metres
Øi
Øi
8 mm
10 mm
35
100
30
100
25
100
20
90
15
70
8
30
6
20
D9550
Fig. 19
D9551
Fig. 20
Tab. F
20136520
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