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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
10
5. 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 (7) towards the gas valve outlet (6).
It operates as an additional safety: if there is no air inlet, there will be no gas admission.
6. The gas shut-off valve controls 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.
8-9. 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 (natural gas).
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.
Содержание ADI CD 375
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