8
3.
Description
3.1
Boiler construction
The main part of boiler is the cast-iron sectional boiler drum made of the grey cast-iron according to
EN 1561, quality 150.
The pressure parts of boiler meet the demands on the strength according to:
EN 303-5
Heating boilers – Part 5: Heating boilers for solid fuels, hand and automatically stocked,
nominal heat output of up to 300 kW – Terminology, requirements, testing and marking
The boiler drum is assembled of sections by means of pressed-in boiler insertions with 56 mm diameter and
secured by anchor bolts. The sections create the combustion chamber and the ash pan space, the water
space and the convective part. The heating water inlet and outlet are situated in boiler rear part.
The rear part of boiler in its upper part has a smoke extension/adapter and the heating water flange. In the
lower part there is the reverse water flange. To the front section there are mounted the stoking and ash-pan
doors. Under the ash-pan door there is installed a tilting grate.
The whole boiler drum is insulated by the health harmless mineral insulation which reduces the losses
caused by heat transmission into the environment. The steel shell is coloured by a good quality comaxit
spray.
3.2
Regulation and safety elements
The smoke shutter of the smoke extension/adapter regulates the flue gases outlet volume from the boiler
into the chimney. It is operated by a handle with drawbar in the left upper part of boiler next to the stoking
door.
The ash pan door choker regulates the combustion air inlet under the boiler grate. It is operated by a draught
regulator. Another draught regulator (for 8, 9, 10 sectional boiler) regulates the rear choker. The regulator is
set on the same temperature as the regulator in the front part of the boiler.
The stoking door choker serves for secondary air supply into the combustion chamber.
A combined device- the thermomanometer serves for heating water temperature and pressure detection in
heating system. The reservoir of thermomanometer sensor is installed in upper part of the front boiler
section.
