3 Mode of operation – Fuel quality requirements
25
* maximum operating temperatures of up to 110 °C can also briefly occur.
3.4 Fuel quality requirements
The heating systemHDG Compact 25 - 80 is designed for the
standard use of burning untreated wood in the form of wood chips,
pellets or shavings/pressed wood briquettes.
W
OOD
CHIPS
Essential criteria for the definition of the property classes are particle
size, moisture content and ash content of the fuel.
P
ARTICLE
SIZE
In accordance with DIN EN ISO 17225-4, the particle sizes for wood
chips are classified into P45S.
Water-side resistance at nominal
thermal power, 10K
2700 Pa
Water-side resistance at nominal
thermal power, 20 K
800 Pa
Other information
Sound pressure level
< 70 dB(A)
Min. Air inlet cross section
150 cm²
180 cm²
210 cm²
Boiler type
HDG
Compact 45
Wood chips /
pellets
HDG
Compact 50
Wood chips /
pellets
HDG
Compact 65
Wood chips /
pellets
HDG
Compact 80
Wood chips /
pellets
Table 3/2 - Technical data
With regard to the quality standards for solid fuel, DIN EN ISO 17225
“Biogenic solid fuel - fuel specifications and classes - classification of
wood chips” applies.
•
Part 4: “Classification of wood chips”
•
Part 2: “Classification of pellets”
•
Part 3: “Classification of wood briquettes”
In accordance with this standard, the properties of fuels that can be
usedHDG Compact 25 - 80 are specified below in detail.
P class
Main content
(mass fraction min.
60%)
Fine content
(% by weight)
≤ 3.15 mm
Coarse content
(% by weight)
Max. length, max. cross section
P45S
3.15 mm < P ≤ 45 mm
≤ 10 %
≤ 10 % > 63 mm, all ≤ 85 mm
(HDG Compact 25/35) and ≤ 120 mm
(HDG Compact 45/50/65/80), cross sec-
tion of the outsized particles ≤ 6 cm
2
Table 3/3 - Particle sizes for HDG wood chip boilers
