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BMV3 / BMV4 / BMV5 : 662Y1000 • A
Figure 10
R
Figure 11
One-line system Pure two-line system
H
max
=
3,5 m
Figure 12
One-line system Pure two-line system
2.7. Oil supply
The construction and installation of the system is to be car-
ried out according to DlN 4755. Local regulations are to be
observed. The oil line is to be installed to the burner such
that the oil hoses can be connected without any constrain.
An oil lter with a quick-close valve is to be installed in the
connection on the suction side. A return check valve is to be
installed in the return ow line. The burner can be operated
in a 1 and 2 pipe system. The burner is delivered for a 2-pipe
system as standard. The vacuum in the suction line may not
exceed 0.4 bar. With a suction height of more than 3.5 m, an
oil circulation pump must be installed. With operation with
an oil circulation pump or if the oil tank is located higher than
the burner pump, the burner must be operated as a 1-pipe
system. If the burner is operated as a 1-pipe system, the re-
turn ow R must be closed at the burner pump and screw G
must be removed (see g. 11).
The pressure in the oil line may not exceed 1.5 bar. After com-
plete installation of the oil lines, a leak test must be carried
out with a pressure of min. 5 bar according to DlN 4755. The
burner may not be connected during the leak test.
2.8. Oil pipes dimensions (see. fig. 12)
Nominal thermal output
of the boiler (kW)
25 35 45
Internal pipe Ø (mm) 4 4 4
H* (m)
Max. length of the oil piping (m)
0 30 30 20
1 30 23 15
2 23 16 10
*H = max. intake height in m (low sulphur fuel oil EL, oil temperature >10
°C, up to 700 m above sea level, 1 filter, 1 check valve, 6x 90° bends).
5


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