Viessmann VITOLIGNO 250-S Operating Instructions Manual page 49

Approved logs
(cont.)
Property class
Diameter
Length for Vitoligno 250-S with 40, 50, 60
and 75 kW
Length for Vitoligno 250-S with 85, 100,
120 and 170 kW
Water content
Approved wood in small pieces
A proportion of the wood fuel may be wood in small pieces as described below.
Coarse woodchips:
Class B1/P31S/M20/A0.8 (properties to
■
EN ISO 17225-4)
Approved fuel for pressure-jet oil burners
Approved fuel: Extra light fuel oil
Non-approved fuels
Danger
The use of unsuitable fuels leads to risk of poi-
soning. Burning waste or wood that has been
treated with timber preservatives or has been
coated with materials containing organic halo-
genated compounds creates highly poisonous
flue gases.
Only use permissible fuels.
!
Please note
If unsuitable fuels are used, there is a risk of
damaging the heating system. Burning waste or
wood that has been treated with timber preser-
vatives or has been coated with materials con-
taining organic halogenated compounds may
result in serious corrosion damage in the boiler.
Only use permissible fuels.
The following must never be burnt:
■ anthracite and coke
Wood waste coated in materials made of organic
■
halogenated compounds (PVC)
■ Wood pellets
To EN ISO 17225-5
B
D15
L50
L100
M20
Joinery waste:
Glued wood and wood remnants
■
They must not be coated in or contain wood preser-
■
vative.
■ The edge length must be > 5 cm.
Ordering fuel
Additional details
–
Hardwood: 5 to 15 cm
■
Softwood: 5 to 12 cm
■
Max. 50 cm
Max. 100 cm
Max. 20 %
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