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La Nordica Norma S Evo Idro DSA Manual

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ENGLISH
MAINTENANCE ON THE WATER SYSTEM
Excessive incrustation deposits on the inner walls of the hearth considerably reduce the eciency of heat exchange; therefore,
remove these deposits using a steel brush whenever necessary. Never use corrosive substances that can damage the thermo-
replace and the boiler.
With the system switched o, once a year carry out the following checks:
• Check the operation and eciency of the blowdown and safety valves. If they are defective, contact your authorised installer. IT IS
STRICTLY FORBIDDEN TO REMOVE OR TAMPER WITH THE SAFETY DEVICES.
• Check the thermal insulation of the lling pipe and the safety pipe.
• Make sure that the system is lled and under pressure, checking the water level in the expansion tank; also check that it is working
properly and check the eciency of the safety pipe.
ROUTINE MAINTENANCE PERFORMED BY QUALIFIED TECHNICIANS
Routine maintenance must be performed at least once a year.
Using wood as solid fuel, the generator requires annual routine maintenance, which must be performed by a qualied technician, using
only original spare parts.
Failure to comply can jeopardise the safety of the appliance and make the warranty null and void.
Respecting the frequencies of cleaning reserved for the user described in the use and maintenance manual, the generator is guaranteed
correct combustion over time, preventing any anomalies and/or malfunctioning that could require more interventions of the technician.
Requests for routine maintenance are not contemplated in the product warranty.
GASKETS
The gaskets guarantee the tightness of the stove and its consequent good functioning.
They must be controlled periodically. They must be replaced immediately if they are worn or damaged.
These operations must be carried out by a qualied technician.
CONNECTION TO THE FLUE
Vacuum and clean the pipe that leads to the ue yearly or any time that it is necessary. If there are horizontal tracts, the residue must be
removed before it can prevent the passage of the fumes.
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 caloric 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 35 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 35
W/m
3
= 5250 W or 5,25 kW. As main heating, a 8 kW device is therefore sucient.
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
36
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