Hitecsa ADISA ADI CD 105, Техническое руководство по установке, использованию и обслуживанию

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ADI CD Boiler – Technical Manual
14
8.1 Assembly of gas connection – air/gas inlet
The ADI CD boiler includes an air-gas premix system of modulating combustion, composed of:
1
B
8-9
2
6
6b 6a
7
15
Pa
5
13
Pg
1 0
V. Venturi operating as an air-gas mixer, ensuring combustion with a constant proportion of air/gas
to the premix burner, throughout its power modulation range.
The venturi produces a depression and drives the gas (G) towards the gas valve outlet (VV).
It operates as an additional safety: if there is no air inlet, there will be no gas admission.
VV. The gas shut-off valve regulates the gas outlet pressure according to the pressure value in the
venturi.
Note: (13) in models CD 200 and higher: a coupling pipe between the gas shut-off valve and the venturi
measures the pressure drop before the mix. For lower models there is no pipe, the connection between
the gas shut-off valve and the venturi is internal.
M. The power modulation is made by varying the fan speed, which also produces a variation of
the air-gas mix flow entering into the burner (B).
Pg. Minimum inlet pressure switch: adjusted at 15 mbar.
For all models: when installing a boiler, install before the gas connection, a gas filter, accessible and
ajustable / cleanable, to retain waste / dust / welding in the gas pipe and prevent its entry into the boiler.
In
models ADI CD 70 to 250 : these pieces form one only
global group: burner, burner-holder plate, motor-fan, venturi
and gas shut-off valve.