27
14. CALCULATION OF THE THERMAL POWER
There is not an absolute rule for calculating the correct necessary power. This power is given according to the space to be heated, but it
depends also largely on the insulation. On an average, the calorific value necessary for a properly insulated room is
30 kcal/h per m
3
(for
an external temperature of 0°C).
Given that
1 kW corresponds to 860 kcal/h
, it is possible to adopt a value of
38 W/m
3
.
Let’s suppose one wishes to heat a room of 150 m
3
(10 x 6 x 2.5 m) in an insulated apartment. In this case, it is necessary to have 150 m
3
x 38 W/m
3
= 5700 W or 5,7 kW. As main heating, a 8 kW device is therefore sufficient.
Approximate combustion value
Required quantity in relation to 1 kg of dry
wood
Fuel
Unit
kcal/h
kW
Dry wood (15% humidity)
kg
3600
4.2
1,00
Wet wood (50% humidity)
kg
1850
2.2
1,95
Wood briquettes
kg
4000
5.0
0,84
Brown coal briquettes
kg
4800
5.6
0,75
Normal anthracite
kg
7700
8.9
0,47
Coke
kg
6780
7.9
0,53
Natural gas
m
3
7800
9.1
0,46
Naphtha
L
8500
9.9
0,42
Electricity
kW/h
860
1.0
4,19
15. TROUBLESHOOTING
PROBLEM
POSSIBLE CAUSES
POSSIBLE SOLUTIONS
The frame of
the cooker or
its parts change
colour
Flue draught pressure too high
Clean the surfaces;
Contact the chimney sweep for a possible installation of a throttle valve;
Bended oven
and chipped
enamel
Flue draught pressure too high
Small enamel chips do not compromise the correct functioning of the appli-
ance. In case of major damages contact the Customer Service.
Contact the chimney sweep for a possible installation of a throttle valve
Rust on the
stainless steel
cooking plate
A slight coat of rust on the whole
surface of the cooking plate
may depend on wet air (cooking
steam)
Grind the surface;
Only when the plate is cold, grease the surface with non acid grease
(vaseline or paraffin oil);
Only when the plate is lukewarm, clean with a soft cloth
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