Astra G-40 MES Handleiding voor installatie en exploitatie - Pagina 6

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oval. It is not recommended to use rectangular shell, as due to the temperature fluctuations, its walls

deform, gaps appear at the element junction points, through which the condensate falls on the walls of

the stone chimney, and an additional air is sucked in, which reduces traction of the chimney. Traction of

smoke should correspond to the calculated value of traction (see the table of technical data). The shell

should be constructed by the factory and certified.

Minimum permissible height of the chimney should be at least 6 m. The top of the chimney

should be above the top roof at least by 0, 5 m. If the chimney is in bigger distance than 1 m from the

top roof, the top of the chimney should level with the line going down from the top roof with no bigger

than 10° angle from the horizon. You should also evaluate the influence of different obstacles present

around the building (trees, other buildings, etc.) (see fig. 3). There can not be connected any other

equipment to the chimney connected with the boiler.

Electrical installation with earthing should be installed for connection of the electrical part of

the boiler pursuant to electrical safety requirements (see a principal electricity scheme, fig. 4).

PROTECT isolation of the connection cable from damages!

The boiler is fired only by firewood and different briquettes. It is prohibited to fire by coal. It

is recommended to fire dry firewood (15-20% moisture content). The drier is the firewood, the bigger its

caloric content. When a moisture content of the firewood is 20%, thermal value of 1 kg is approximately

4 kWh; when the moisture content is 50%, its thermal value reduces in half.

The length of the firewood should be at least 5 cm shorter than the length of the boiler

combustion chamber, i.e.:

Boiler type

The maximal length of

the firewood in mm

The recommended thickness of the firewood is 100-150 mm. Larger firewood should be

split at least once.

WARNING! Don't fire newly prepared and too damp firewood!

Recommendations for firewood preparation:

Put split firewood into well ventilated and, if possible, well sun lightened place.

Firewood should be well protected from rain and snow;

stow the split firewood with sufficient gaps in between in order for a freely circulating air

to withdraw the moisture evaporated from the firewood;

there should be a sufficient space atop of the firewood up to the roof and such

ventilation that wet air could drift away;

it is not recommended to store freshly cut (undried) firewood in the cellar, as its drying

requires sun and free air circulation. Dry firewood could be stored in the cellar where

sufficient ventilation is guaranteed;

It is recommended to dry split firewood under above described conditions in

dependence with the type of the wood: soft wood (alder, asp, fir, willow etc.) – no

shorter than 8 months, hard wood (oak, ash, birch, etc.) – no shorter than 20 months.

Preparation for heating

Before kindling the boiler, check the edge (5) position at the lower combustion chamber

(see fig. 2): the edges should be pressed to the rear wall of the boiler; ~ 100 mm gap should be

between the wall and the edge in the front.

At the rear part of the boiler at the air inlet above the ventilator there is a damper to

regulate the air inlet to the upper burning chamber and heater (fig. 12). Operation of the damper: after

loosening the screw push the damper until the support and then pull by 15 mm (till the marking on the

damper plate) and then tighten it with screw. This damper has to be adjusted during the preparation for

handling. It is recommended to check the position of this damper at the beginning of the heating

season.

During heating season don't put firewood and other flammable materials on the boiler (or at

unsafe distance). You can cause a fire!

Fill the heating system with water. The filling pressure has to exceed the hydrostatic

pressure by 0, 2 bars but no exceeding the working pressure of the boiler. When the system is filled up

with water, check tightness of the whole system before kindling the boiler and afterwards when the

operation reaches its standard mode.

Check if the air is sufficiently drained from the heating system.

5. FUEL

G-18

G- 25

G- 31,5

310

450

6. EXPLOITATION

G- 40

G- 50

550

G- 80

G- 100

750