5. THE CHIMNEY
The following will be respected:
Conform DIN 4705 and DIN 18160, the evacuation of exhausts in the atmosphere as much as the
reducing of the temperature of those on the way must be made in such a way that the
condensation and its consequences be avoided.
The correct running of the chimney is very important for the boiler running.
•
Chimney tightness:
no cool air is allowed to enter by cracks or openings, because in this case
the burning gases are cooled and produce condensation. There is the danger that the condensed
gases may enter the boiler and produce corosion. Likewise it must be avoided the entering of rain
water in the chimney .
•
The evacuation of the exhausts should be smooth,
with no obstacles
– foreign parts (bricks,
bird nests, woods, grass, etc).
•
The cleaning of the chimney
esspecially in the exit points from the boiler and the elbows,
where the exhaust gases change their course. A clean chimney means a correct draught.
•
The insulation of the chimney is compulsory.
•
An uptight chimney can make many problems to the boiler,
for example filling, a lot of
smoke, noises, bad running of the burner, etc. Another big problem is the forming of an air current
and vortexes that do not allow the easy evacuation of exhaust gases .
• The chimney must have
an increased height
twards the building.
• The material from which the chimney is built doesn’t have to be influenced by the exhaust
gases.
For all the above reasons it is required a periodic inspection of the chimney especially at the
beginning of the winter time.
ATTENTION:
A very little chimney gets clogged quickly. A very big chimney cools to much the exhaust gases
and produces condensa
tion. So the chimney doesn’t have to be too big or too small.
