20197230
14
GB
Hydraulic systems
6.2
One-pipe system
Pressurised one-pipe systems (Fig. 10) 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. 11) have a negative pres-
sure (depression) at the burner inlet.
Usually the tank is lower than the burner.
6.2.1
Priming pump
On the system in Fig. 10 just loosen the plug of the vacuometer
(Fig. 11) and wait until the fuel comes out.
On the system in Fig. 11 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.
Tab. F
Tab. G
H
difference of level
L
maximum length of the suction line
I.D.
internal diameter of the oil pipes
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.
CAUTION
You are advised to use additional filters on the fuel
supply line.
The Manufacturer recommends the use of a good
quality fuel filter on the tank (Fig. 10-Fig. 11), and
a secondary filter (60
for light oil), 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
max.
4 m
min.
0.1 m
Fig. 10
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
Fig. 11
max.
4 m
H
H
D5308
Summary of Contents for 3749251
Page 2: ...Original instructions...
