Riello BG6.1D, Installation, Use And Maintenance Instructions

Page: 23 / 80

21 20137240
GB
Installation
5.13.3 Pressurised one-pipe systems
Pressurised one-pipe systems (Fig. 20) 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.
Tab. F
H
= Difference of level
L
= Maximum suction line length
Ø
= Inner diameter of the pipe
5.13.4 Priming pump
In the systems
A
and
B
of Fig. 21 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.
In vacuum systems
B
(Fig. 21) we recommend bringing the re-
turn line to the same height as the suction line.
In this case a foot valve is not required.
Should however the return line arrive over the fuel level, a foot
valve is required.
This solution however is less safe than previous one, due to the
possibility of leakage of the valve.
H
= Difference of level
L
= Maximum suction line length
Ø
= Inner diameter of the pipe
Tab. G
H
metres
L metres
Ø (8 mm) Ø (10 mm)
0.5 10 20
1 20 40
1.5 40 80
2 60 100
max. 4
m
D5414
Fig. 20
H
WARNING
The pipes must all be perfectly sealed.
Fig. 21
D5415
A B
H
max. 4 m max. 4 m
H
H
H
H
metres
L metres
Ø (8 mm) Ø (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