2 | Safety
10
B1510622_en | Operating instructions Firewood boiler S4 Turbo
Storage time dependent upon water content
Wood type
Water content
15 – 25%
less than 15
%
Storage in heated and ventilated room
(approx. 20°C)
Soft wood (e.g.
spruce)
approx.
6 months
from 1 year
Hardwood (e.g.
beech)
1 – 1.5 years
from 2 years
Outdoor storage (protected from elements,
exposed to wind)
Soft wood (e.g.
spruce)
2 summers
from 2 years
Hardwood (e.g.
beech)
3 summers
from 3 years
Freshly cut wood has an approximate water content of 50 to 60%. As the above table
shows, the water content of the firewood decreases the longer the wood is stored
depending on how dry and warm the storage location is. The ideal water content of
firewood is between 15 and 25%. If the water content falls below 15%, we recommend
you adjust the combustion control to the fuel.
The air duct should be adjusted accordingly for optimal burning of these fuels (w < 15%).
"Extra cleaning of flue gas paths" [
2.4.2 Fuels permitted under certain conditions
Wood briquettes
Wood briquettes for non-industrial use with a diameter of 5-10 cm and 5-50 cm long.
Note on standards
EU:
Fuel as per EN ISO 17225 - Part 3:
wood briquettes class B / D100 L500 Form 1 - 3
Additional for
Germany:
Fuel class 5a (§3 of the First Federal Emissions Protection Ordinance
(BImSchV) - applicable version)
Notes on
use
▪ When burning wood briquettes use the settings for extremely dry fuel
▪ Wood briquettes must be heated up with firewood as per EN ISO 17225-5
(at least two layers of firewood under the wood briquettes)
▪ The fuel loading chamber must not be filled more than 3/4 full, as the wood briquettes expand
during combustion
▪ Even when using the settings for dry fuel, burning wood briquettes can cause combustion
problems. In such cases, repairs must be carried out by qualified staff. Please contact Froling
customer services or your installer.
