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INSTALLATION
2.8.1
Technical specifications of stack
The stack must satisfy the following requirements::
− It must be constructed from materials that are imper-
meable to flue gases and that offer lasting resistance to
mechanical stress, heat and the action of the products of
combustion and condensate
− It must be vertical, free of restrictions and contain bends
of no more than 45°
− It must be suitable for the specific operating conditions
of the boiler and must be CE marked
− It must be of adequate dimensions to ensure draught
and venting properties suitable for the needs of the boil-
er
− It must have adequate external insulation to prevent
condensation and the cooling of flue gases
− the stack must have a dedicated condensate drain sys-
tem at the bottom.
9
The diameter of the smoke duct must never be smaller than
the diameter of the flue gas duct of the thermal unit.
9
In configuration B23, the stack must guarantee the mini-
mum draught specified by applicable technical standards,
assuming zero pressure at the boiler's flue gas exhaust.
2.8.2
Connection to the stack
The boiler must be connected to the stack using rigid flue pipes
that are resistant to heat, condensate and mechanical stress. All
joins must be sealed and the finished flue must be insulated.
The near-horizontal section of flue pipe must have a slope of at
least 5° towards the boiler and must also be properly insulated.
In long near-horizontal sections of flue pipe (L>1 m), install a
condensate drain system near the boiler exhaust (as shown in
the figure) to drain off any condensate forming in this section
of flue.
The diameter of the stack must always be greater than that of
the flue pipe from the boiler's exhaust fitting. To change direc-
tion, use a T section with an inspection cap to permit easy access
for cleaning inside the pipe. After cleaning, always make sure
that inspection caps are replaced tightly and that their seals are
undamaged and efficient.
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