13
20123476
GB
Installation
5.8
One-pipe system
Pressurised one-pipe systems (Fig. 9) have a positive fuel pres-
sure on the burner intake.
Usually the tank is higher than the burner, or the fuel pumping
systems are on the outside of the boiler.
One-pipe vacuum systems (Fig. 10) have a negative fuel pres-
sure (depression) on the burner intake.
Usually the tank is lower than the burner.
5.8.1
Priming pump
On the system in Fig. 9, just loosen the plug of the vacuometer
6)(Fig. 10) and wait until the fuel flows out.
On the system in Fig. 10, 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.
Tab. D
Tab. E
H
difference of level
L
max. length of the suction line
I.D.
internal diameter of the oil pipes
NOTE:
The Tab. D and Tab. E show the maximum approximate lengths
for the supply line, depending on the difference in level, length,
and the diameter of the fuel conduit.
CAUTION
You are advised to use additional filters on the fuel
supply line.
The manufacturer recommends a good quality
fuel filter at the tank (Fig. 10 - Fig. 11) and a sec-
ondary filter (60 m for gas oil and 15 m for kero-
sene) are used to protect the burner pump and
nozzle from contamination.
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.
H
metres
L metres
I.D. (8 mm)
I.D. (10 mm)
0.5
10
20
1
20
40
1.5
40
80
2
60
100
H
m
a
x
.
4
m
m
in
.
0
.1
m
D11009
Fig. 9
H
metres
L metres
I.D. (8 mm)
I.D. (10 mm)
0
35
100
0.5
30
100
1
25
100
1.5
20
90
2
15
70
3
8
30
3.5
6
20
H
m
a
x
.
4
m
D11010
H
Fig. 10
