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Technical requirements and acceptance tests; Minister of Infrastructure Regu-
lation concerning technical conditions that should be met by buildings and their
setting, of 12 April 2002, Journal of Laws No. 75, item 690, as amended 2.
A too small pipe may also cause or facilitate formation of soot deposited in the
boiler convection ducts.
When the flow in the stack is too strong, it will suck excessive amounts of air
from outside to the burner, increasing heat losses and increasing amounts of
dusts blown out of ashes. The flue gas damper installation in flue pipe allows to
dampen too high flow.
It is important for the stack to start at the boiler room floor level, to provide for
flue gas return. It is also important to provide a clean out hatch with a tight closing
system in the bottom part of the stack. To prevent a reverse flow in the flue pipe it
should reach at least 0.6 m above a roof ridge. Stack usefulness (patency) should
be checked and confirmed by a licensed chimney sweep at least once a year.
BEFORE THE BOILER IS STARTED, THE STACK MUST BE WARMED UP!
(See chapter 8.2, Boiler firing and operation)
Due to the low temperature of exhaust gas at the nominal thermal power bo-
iler can cause pollution, wet deposition of soot, insufficient chimney flow. This
may result in moisture accumulation and corrosion of masonry chimney stacks.
A chimney liner is recommended.
In accordance with 4.4.3 of the standard PN-EN 303-5:2012, the manufacturer
gives information concerning the implementation of a stack:
• In the case of retrofitting existing stacks and adapting them to all year work
the flue gas outlet system is recommended (e.g. JEREMIAS, KOMINUS,
etc.) made of stainless steel (acid- and heat resistant), single- or double-
-walled (depending on the location of installation).
• In newly built premises for the all year work the boiler should be supported
by the ceramic flue gas removal system resistant to condensate, thermally
insulated, with ventilation (e.g., SCHIEDEL, LEIER, etc.).
7.5. BOILER CONNECTION TO A HEATING SYSTEM
The boiler should be connected to the heating system with screw connections;
it is forbidden to install the boiler by welding it to the system. The main supply/re-
turn water system connections cannot be reduced below a diameter of a connector
installed on the boiler.
Before starting works to connect the boiler to the heating system check if all
boiler subassemblies are in a good operational condition and the boiler equipment
is complete.
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