Bedienungsanleitung La Nordica Astrid (Seite 23 von 48) (Deutsch, Englisch, Französisch, Italienisch)

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BREAK OF GLASSES: Given that the glass-ceramic glasses resist up to a heat shock of 750°C, they are not subject to thermal

shocks. Their break can be caused only by mechanic shocks (bumps or violent closure of the door, etc.). Therefore, their

replacement is not included in the warranty.

12.7. CLEANING OUT THE ASHES

All the devices are equipped with a hearth grating and an ash drawer for the collection of the ashes Picture 8 at page 43.

It is suggested to empty periodically the ash drawer and to avoid it lls completely in order not to overheat the grating. Moreover, it is

suggested to leave always 3-4 cm of ash in the hearth.

CAUTION: The ashes removed from the hearth have to be stored in a container made of re-resistant material equipped with an

air-tight cover. The container has to be placed on a re-resistant oor, far from ammable materials up to the switching off

and complete cooling.

12.8. CLEANING THE FLUE

The correct lighting phase, the use of proper quantities and types of fuels, the correct position of the secondary air regulator, enough

draught of the chimney-ue and the presence of combustion air are the essential elements for the optimal functioning of the appliance.

The device should be completely cleaned at least once a year or every time it is needed (in case of bad working and low yield). An

excessive deposit of soot can cause problems in the discharge of smokes and re in the ue.

The cleaning must be carried out exclusively with cold equipment. This operation should be carried out by a chimney sweeper who

can simultaneously perform an audit of the ue (checking of possible deposits).

ASTRID

7193901 - IT - EN - DE - FR 23

13. 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

(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

Let’s suppose one wishes to heat a room of 150 m

(10 x 6 x 2.5 m) in an insulated apartment. In this case, it is necessary to have 150 m

x 38 W/m

= 5700 W or 5,7 kW. As main heating, a 8 kW device is therefore suf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

7800 9.1 0,46

Naphtha L 8500 9.9 0,42

Electricity kW/h 860 1.0 4,19

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