21
INSTALLATION
C63
C63 Upstream fan. Comburent air intake and flue gas vent
pipes without terminals.
The vent and air intake must be made using flue pipes sold
and certified separately.
9
See the specific standard for details.
SEALED INSTALLATION (TYPE C)
Twin flues (Ø 80/120)
Twin flues can be oriented in whatever direction is most con-
venient for the room.
9
Ensure that the flue gas vent pipe has a slope (
≥
5°) towards
the boiler.
9
Use of a flue longer than the maximum specified along-
side leads to a loss of heat output from the boiler (see table
alongside).
Maximum straight length of flues
Ø 80 (m)
Pressure drop (m)
45° bend
90° bend
20
0.5
1.0
Maximum straight length of flues
Ø 120 (m)
Pressure drop (m)
45° bend
90° bend
20
0.5
1.0
9
Maximum straight length is the maximum length of the flue
without bends, terminals or joints.
9
Never obstruct or partly choke the comburent air intake
pipe.
2.10.1
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 (EN1856-1, EN1443)
− It must be of adequate dimensions to ensure draught
and venting properties suitable for the needs of the boil-
er (EN13384-1)
− 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 stack must never be smaller than that of
the flue pipe from the boiler.
2.10.2
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.
Only use materials that are suitable for this purpose, e.g. stain-
less steel.
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.
9
Flue pipes must maintain a distance of at least 500 mm
from flammable or heat sensitive construction materials.
9
Joins must be sealed with materials that are resistant to
acid condensate and to the high temperatures of the boil-
er's flue gases.
9
When installing flue pipes, always bear in mind the direc-
tion of the flue gases and of possible condensate flows.
9
Inadequate or badly dimensioned stacks and flues can in-
crease combustion noise, cause condensation problems
and affect combustion parameters.
9
Uninsulated flues are potentially dangerous and can cause
burns.
