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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
3
over 2 m
/h at 0.5 mbar:
for instance, the above requirements 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 inside diameter of the hose must be at least 80 mm.
The intake tube can be up to 6 metres in length.
Length is reduced if there are bends in the intake
section.
For instance, using a tube with a smooth inside
WARNING
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 comply with one of the installations
illustrated in the figures below.
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
WARNING
feature a shutting device (valves, mem-
branes etc.).
Coaxial tubes must not be installed for any
reason.
3121
Installation
S7876
S7853
GB
14
S7851
Fig. 10
Fig. 11
Fig. 12
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