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15
EN
5.4.4 CONNECTION OF THE BOILER TO THE CHIMNEY
Connection of the appliance to the chimney hole must be always done with permission of the
appropriate chimney sweep association. The chimney hole must always generate sufficient
draught and take the flue gas out into the atmosphere under the all operating conditions.
Correct dimensions of the chimney hole are important for correct boiler function, because burn-
ing, output and boiler life – time are influenced by the draught. The chimney draught directly
depends on its diameter, height and roughness of the internal wall. It is not allowed to connect
any other appliance to the chimney, where is the boiler connected. Diameter of the chimney
must not be smaller than the outlet part of the boiler. Chimney draught must achieve prescribed
values. It cannot be too high to not decrease the boiler output and interrupt the burning (flame).
If there is too strong draught, install the throttle flap into the chimney hole between the boiler
and the chimney.
Less than 8m - low chimney =
INCORRECT!
For correct boiler operation
min. chimney height 8m
Pic. 3 Correct and incorrect parameters of the chimney for connection the SLX boiler
Prescribed values of the chimney diameter and height:
20 × 20 cm min. height 7 m
20 cm min. height 8 m
15 × 15 cm min. height 11 m
16 cm min. height 12 m
Exact dimensions of the chimney determines STN 73 42 10. Prescribed chimney draught is stated
in Technical parameters. Chimney draught is measured by the devices intended for this opera-
tion, minimally 40 cm behind the outfall of the chimney. Draught is measured during the boiler
operation at full output, by the same temperature of flue gas as the set one.
In case, that your chimney does not achieve prescribed parameters of the chimney, it is possible
to install additional fan ATTACK PV150 behind the boiler, which is able to make required pa-
rameters of the chimney.
It is necessary to keep in mind by choosing the type of the chimney or during the boiler opera-
tion, that stainless insulated chimney (most of the time placed externaly at the sheathing of the
building) has the best qualities of the chimney draught beginning after heat up, because it is
quickly warmed in a whole lenght. Chimney with stainless insertions has worse qualities of the
chimney draugh beginning, because it is warmed slower than insulated chimney. Worst qualities
16


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