5
Pellets must conform at least to one of following directives or standards:
¾
Directive no. 14-2000 MŽP
Č
R
¾
DIN 517 31
¾
ÖNORM M 7135
Specified granularity of pellets 6 to 8 mm
Water content in fuel
max. 12 %
Ash content
max. 1,5 %
ATTENTION! A low fuel quality can distinctly negatively influence the boiler output and emission
parameters.
3. Description
3.1 Boiler construction
The pressure components of boiler correspond to strength requirements according to:
EN 303-5
Boilers for central heating– Part 5: Solid fuel boilers for central heating with manual or
automatic feed and nominal heat output maximum 300 kW – Terminology, requirements,
testing and marking.
The cast iron body positioned on the basement welded of steel sheets is the core part of the boiler. The
boiler drum consists of 4 sections connected by means of pressed-on boiler inserts of 56 mm diameter and
secured by anchor bolts. The sections form the combustion space, ash-pan space (for manual regime),
water space and convective part. The heating water inlet and outlet are situated at the rear of the boiler.
The rear boiler section has the smoke adapter and heating water flange in the upper part and the return
water flange is in the lower part of the basement. The stoking door and ash-pan door are fastened to the
front section. The folding grate is positioned behind the ash-pan door (Manual operation).
Under the cast iron body there is positioned the burner with mixer (see. Fig. no. 4 and Fig. no. 5) that
consists of cast iron grate and retort. The fuel is fed from the reservoir through the feed screw emptying into
retort on the cast iron grate. The retort for fuel feed is equipped with holes for combustion air pressure
balancing in the burner which prevents the flame bursting into the feeder during burning process (hard coal
and lignite).
The ash-pan drawer is under the combustion chamber. Next to the boiler there is positioned the fuel
reservoir that empties into fuel feed screw.
Ventilator for combustion air is positioned behind the fuel reservoir and is connected to the burner.
Ventilator has the modulation control by SAPHIR regulator depending on the required output.
Heating water inlet and outlet are situated at the rear of the boiler by means of two flanges 2” for
connection to the heating system. The temafast Ø 60 x 48 x 2 mm sealing is between the boiler and flange.
All components (boiler drum, basement) are insulated by means of health non-detrimental mineral
insulation that reduces the heat transmission losses.
The high-quality komaxit spray is used for boiler shell colour treatment.
The boiler is made in left & right design.
