Riello RG2 - Vacuum Systems

23
20136866
GB
Installation
5.13.6 Vacuum systems
Depressurised systems (Fig. 21) have a negative fuel pressure
(depression) at the burner intake.
Usually the tank is lower than the burner.
Tab. G
H = Difference of level
L = Maximum suction line length
Ø = Inner diameter of the pipe
Fig. 21
H
max. 4 m
max. 4 m
H
H
H
S9667
AB
H
metres
L metres
Øi (8 mm) Øi (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
WARNING
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.
The pipes must all be perfectly sealed.