20119857
10
GB
Installation
5.6
Burner assembly
CF Application
In case of
CF
applications, the burner shall not operate without
protection
(A)
of the suction inlet (Fig. 7).
BF Application
In case of
BF
applications an optional snorkel and gasket are
available replacing
(A)
with
(B)
. This item can be supplied sepa-
rately (Fig. 8).
The combustion air supply is through a flexible or rigid pipe con-
nected to the air intake.
Consequently, you must comply with the following requirements
and instructions:
The combustion air intake tube must be:
– fastened securely to the burner;
– made of a suitable material, with temperature characteris-
tics in the range - 30 °C to 80 °C;
– in compliance with all requirements of applicable regula-
tions in force in the country of destination.
The intake-tube / burner system must not allow a loss of
over 2 m3/h at 0.5 mbar: for instance, the above require-
ments will be met if you use flues for pressure exhaust of
flue gases (the condensation kind).
Make sure the air intake tube’s inlet is positioned so that it is
not likely to be obstructed by foreign matter and, where nec-
essary, use suitable screens.
The temperature of the incoming air must not exceed 40 °C;
The inside diameter of the hose must be at least 80 mm.
The intake tube can be up to 6 metres in length.
For instance, using a tube with a smooth inside surface, you must
allow for the following losses:
–
for each 45° bend, tube length is reduced by 0.5 m;
–
for each 90° bend, tube length is reduced by 0.8 m.
NOTE:
burner installation must, in any case, comply with the flue
systems included within the boiler approved configuration.
WARNING
For correct BF application, the burner must be
installed on an appropriate of boiler.
WARNING
Length is reduced if there are bends in the in-
take section.
WARNING
Under no circumstances should the air’s
entry in the hose intake area be obstructed.
The hose must not be blocked in any way or
feature a shutting device (valves, membranes
etc.).
D5884
A
Fig. 7
B
Fig. 8
D5883
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