HDG F20 - Functional Description; Boiler HDG F20-50

3 Mode of operation – Functional description
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3.2 Functional description
BOILER HDG F20-50
GENERAL INFORMATION The HDG F20-50 is a special boiler for the firing of wood up to 50 cm
in length. The HDG controls system regulates the combustion and
output as well as the weather-compensated heating. The HDG F20-
50 boiler and the HDG controls system are harmonised with one
another and form a functional unit. This enables wood to be
converted into heat energy in an environmentally sound and
convenient manner.
C
OMBUSTION PROCESS
Inside the HDG F20-50 boiler, fuel which has been manually placed in
the fuel chamber (4) and ignited is degassed through the addition of
primary air. It can also be ignited automatically using the ignition fan
(7). The resulting wood gas is mixed with secondary air in the
combustion chamber (2) where it is burnt off.
Ashes are collected in the large ash compartments (6) for
combustion ash and fly ash.
The air necessary for combustion is supplied as required via the
suction fan (8) and two actuators (5) with metering mechanisms.
The lambda sensor, the boiler temperature sensor and the flue gas
temperature sensor are used to do the following:
• To continuously monitor the firing
• To adjust the boiler output
Figure 3/4 - Boiler HDG F20-50
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