3 Mode of operation – Fuel quality requirements
20
*Maximum operating temperatures of up to 110 °C can also briefly
occur.
3.4 Fuel quality requirements
The HDG F20-50 boiler is designed for the standard use of burning
untreated wood in the form of logs or pressed wood briquettes.
LOG WOOD
Essential criteria are the length, diameter and water content of the
fuel.
L
ENGTH AND DIAMETER For the log wood boiler HDG F20-50, firewood with a length of up to
50 cm (L50) can be used. The maximum diameter of the firewood is
specified as D15 (diameter of maximum 15 cm).
The firewood must be split at least once so as to provide an optimal
surface for gasifying the wood. The major proportion of the firewood
should measure between 8 and 12 cm in diameter.
W
ATER CONTENT When selecting fuel, note that the calorific value of the wood is
primarily dependent on the water content. The more water
contained in the wood, the smaller the calorific value, since the water
vaporises in the course of the burning process and thereby
consumes heat. This leads to a decreased efficiency and thus to
higher fuel consumption. A higher water content in the fuel also
results in a steadily decreasing output of the (central-heating) boiler,
Connection for filling/draining (bushing) DN 15, inside thread
Recommended pipe dimensions (minimum) DN 32
Water-side resistance at nominal thermal
power
10 K / 20 K
1500 Pa / 300 Pa 1700 Pa / 400 Pa
Other information
Combustion duration per filling in terms of
fuel recommendation, approx.
Beech: up to 6 h
Spruce: up to 5 h
Beech: up to 5 h
Spruce: up to 4 h
Sound pressure level < 70 dB(A)
Min. Air inlet cross section
150 cm
2
Type of boiler HDG F40 HDG F50
Table 3/2 - HDG F40/50 technical data
With regard to the quality standards for solid fuel the DIN EN ISO
17225 “Biogenic solid fuel - fuel specifications and classes -
classification of wood chips” applies.
• Part 5 “Classification of log wood”
• Part 3 “Classification of wood briquettes”
In accordance with this standard, the properties of fuels that can be
used with the HDG F20-50 are specified below in more detail.
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