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4. Description
4.1 Boiler construction
The boiler construction meets ČSN EN 303-5 : 2000 requirements:
- boiler for CH - Part 5: boiler for DHW using solid fuel with manual or automatic
feeding, at a nominal heat output of up to 300 kW -
Terminology, requirements, testing and marking.
The core of the boiler is the cast-iron body. The body is composed of front, rear and
middle sections. The main function of the boiler body is to transfer thermal energy from
the exhaust gas to heat water. The upper cleaning door and the middle door are
located on the front section. The smoke extension that funnels emissions to the flue is
located on the back section.
The cast iron body is set on the base. The base is made from a 5mm-sheet of steel.
The ash pan door is on the front of the base.
The burner is placed into the side wall of the base. The feeder shaft extends into the
burner, where it is fastened on the far side. The screw feeder extends to the
combustion chamber and pushes against a counter screw, which forces the fuel
upwards. The upper part of the burner is made from two cast-iron rings.
Two ceramic plates are positioned inside the boiler body in front of the cleaning door
to impro e combustion.
The burner’s ash pan is placed at the bottom of the base.
The burner is fed air by a fan placed on the flange of the burner under the fuel hopper.
The fan can be regulated electronically.
The screw feeder is placed next to the co ered fuel hopper. Boilers can be ordered in
two ariations:
• right fed – The fuel hopper is on the right side of the boiler body from the front
perspecti e
• left fed – The fuel hopper is on the left side of the boiler body from the front
perspecti e
There is wax plug inside the burner, which is the emergency extinguisher.
The boiler body, base and doors are insulated with non-toxic mineral insulation to
minimize heat transmission losses to the surroundings.
