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electronic controller of boiler and is connected to the electric socket on the rear wall of the

boiler.

Boiler room should be ventilated. The required airflow necessary for combustion and ventilation

should be also guaranteed. For this purpose, boiler room doors should have grid or there

should be a gap between the doors and the floor. If there is no possibility to bring air in from

another rooms or the house is very tight, it will be necessary to make an opening in the exterior

wall. Air quantity should be no less than 1, 6 m

should be no less than 0,001 m

presented in the table below.

Boiler type

Required air quantity

per hour, m

Area of airflow

opening, m

For example: the area of airflow opening should be 0,025 m

height of the gap under the door - about 4 cm when door width is 60 cm.

Put the boiler on the hard (e.g. concrete) and even ground, closer to the chimney pot. Leave at

least 600 mm gap between the back wall of the boiler and building structure for boiler servicing and cleaning.

The smallest distance between a lateral wall of the boiler and building structure is 400 mm. If building structure

is of the flammable materials, this distance should be doubled. At least 800 mm gap should be left from the

other side of the boiler to have an access to the backside of the boiler, its servicing and cleaning. From three

sides of the boiler the floor of 300 mm and from the front of the boiler the floor of 500 mm should be of

inflammable materials. Screw supporting legs in to the base of the boiler and level the boiler with screw nuts

using a level. Then connect the circulation pump of heating system to the relay of the boiler conductors marked

with ◄ sign.

Smoke exhaust opening of the boiler should be connected with the chimney by a metal pipe.

Internal diameter of the metal connecting pipe should be at least of the external diameter of the smoke exhaust

opening of the boiler. To improve the traction, a connecting pipe between the boiler and the chimney should be

installed with an inline towards the boiler. All junctions should be carefully tightened by a heat-resistant material

und insulated.

ATTENTION! If you install additional valve between the boiler and chimney for the regulation of

traction, this valve in the closed position must not close more than 2/3 of the diameter of outlet.

Chimney requirements. It is recommended to install acid-resistant stainless steel shell into the

stone chimney. It improves traction of the chimney and protects the stone chimney from destruction due to the

condensate (moisture) impact. Internal diameter of the shell should be no less than the external diameter of the

smoke exhaust opening of the boiler. Chimney shell may be round or 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).

It is not allowed to 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.:

ASTRA H-25 ES

0,018

/kW per hour. Cross-section area of the opening

/kW. The required air quantities and areas of the opening are

ASTRA H-31,5 ES

5. FUEL

ASTRA H-45 ES

0,025

or 250 cm

, i.e. 16x16 cm; or the

50,4

0,0315

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