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5.10
One-pipe system
Pressurised one-pipe systems (Fig. 11) have a positive fuel pres-
sure at the burner inlet.
Usually the tank is higher than the burner, or the fuel pumping
systems are on the outside of the boiler.
The one pipe vacuum systems (Fig. 12) have a negative pres-
sure (depression) at the burner inlet.
Usually the tank is lower than the burner.
You are advised to use additional filters on the fuel
supply line.
The Manufacturer recommends the use of a good
CAUTION
quality fuel filter on the tank (Fig. 12), and a sec-
ondary filter (60 for light oil and 15 for kero-
sene), to protect the burner pump and nozzle from
contamination.
In case of biodiesel use, pay attention to install
bio-compatible filters.
5.10.1 Priming pump
On the system in Fig. 7 just loosen the plug of the vacuometer
6)(Fig. 12) and wait until the fuel comes out.
On the system in Fig. 12 switch on 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 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.
WARNING
H
metres
I.D. (8 mm)
0.5
1
1.5
2
D11009
Fig. 11
L metres
I.D. (10 mm)
10
20
20
40
40
80
60
100
Installation
H
metres
0
0.5
1
1.5
2
3
3.5
H
Difference of level
L
Max. length of the suction line
I.D. Internal diameter of the oil pipes
NOTE:
Tab. F, and Tab. G the approximate maximum lengths for the
supply pipes, according to the difference of level, length and di-
ameter of the fuel line.
Tab. F
15
GB
D11010
L metres
I.D. (8 mm)
I.D. (10 mm)
35
100
30
100
25
100
20
90
15
70
8
30
6
20
Fig. 12
Tab. G
20130035
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