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6. PRINCIPLE OF THE BOILER OPERATION
The required combustion air is blown into the air channel
(2) by the fan (1) via a non-return valve.
This valve is installed to prevent accumulated heat from
escaping when the boiler is out of operation. Standing
losses are reduced considerably this way.
The boiler is provided with a number of separate burner
compartments (see g. 1, chapter 2), each provided with
a curved mixing section (3) with gas injection (4).
The combustion air is uniformly distributed over the vari-
ous curved mixing sections in the air channel.
The injectors blow the gas radially into the air fl ow.
This gas injection method ensures proper mixing of air
and gas, thus creating a homogenous mixture.
The curved mixing sections are connected to the distri-
bution chambers (5). A throttle plate is tted in the distri-
bution chamber of the burner compartment on the gas
connection side. This throttle plate has to build up the
control pressure for the gas control block for the gas/air
ratio control. This control ensures optimal combustion
under all circumstances.
Furthermore, each mixing chamber is provided with a
distribution plate. This slotted plate serves to distribute
the mixture over the burner (6).
The burners have a metal fi bre cover in which a burner
pattern is punched. The gas/air mixture is ignited and
combustion takes place. Premix combustion ensures a
very low NOx emission.
The ue gases then fl ow through the cast iron exchanger
(7) and transmit their heat to the heating water. The
ue gases are reversed in the ue gas collector (8)
and discharged through the ue gas discharge pipe (9)
(included in the supply).
Fig. 10 Right side, cross section
15


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