6
4.
Description
4.1
Boiler construction
The main boiler segment is the iron-cast sectional boiler drum made of grey cast-iron in compliance with:
EN 1561
cast-iron 200
The pressure segments of the boiler conform to the strength requirements in compliance with:
EN 656
Gas – fired central heating boilers – Type B boilers of nominal heat input exceeding 70 kW
but not exceeding 300 kW
The main boiler segment is the iron-cast sectional boiler drum. The individual sections are connected by
means of forced-on insertions and tightened by means of the anchor bolts, thus creating a combustion space
with convection surface for combustion gases heat transfer into the heating water. In the upper part of outer
sections on the side where the electric panel is positioned there is screwed a basin for thermometer, the
capillary thermostats sensors and the clack valve for thermomanometer. The connecting points (heating
water input and output, gas) are situated in the rear end of the boiler. The whole boiler drum is insulated with
a harmless mineral insulation which reduces the losses caused by heat transmittance into the surroundings.
To the upper part of the boiler drum there is mounted by means of the screws a built-in draught diverter with
a mouthpiece for setting-on a stove-pipe to lead away the combustion gases into the chimney. The draught
diverter is made of the stain steel and equipped with a dismountable cleaning cover.
The whole boiler drum is seated on a steel basement a part of which is the protective plate made of the stain
steel. The atmospheric burner composed of oval low-emission burner tubes is made of the stain steel.
Individual tubes are mounted on the burner plate by means of four screws screwed in the plate. A
progressive burner construction enables to close fully the boiler combustion space. All air needed for
combustion is brought into the burner tubes through the diffusers. To the burner plate there is welded a gas
distributor with nozzles and there is mounted a pilot burner and a watching electrode.
The boiler control is situated on the control panel in the upper front end of the boiler. The steel surface of the
boiler shell is in colour treated by applying a good quality comaxite coat.
4.2
The boiler assembly
The boiler assembly is described in the „Assembly manual“.
1. The boiler assembly is to be done in place where the boiler will be installed. (it is necessary to
respect all boiler positioning requirements defined in chapter no. 6) according to the project
documentation. The boiler must stand fast and well –balanced on a fireproof pad in vertical position.
2. The connection to the heating system is to be done according to the elaborated project.
3. The combustion gases reflux fuse must not be put out of operation. It is forbidden to interfere in
any way with the combustion gases reflux fuse. For the assembly of the combustion gases reflux
fuse and the exchange of its faulty parts only the original parts delivered by the manufacturer are
allowed to be used.
4. The connection to the chimney can only be done with the agreement of a competent chimney
sweepers´ firm. The boiler connection to gas and heating system.
