19
ENGLISH
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
boiler
- 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.
b
The diameter of the stack must never be smaller than that
of the flue pipe from the boiler.
b
In configuration B23, the stack must guarantee the min-
imum draught specified by applicable technical stand-
ards, assuming zero pressure at the boiler's flue gas
exhaust.
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. stainless 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 ac-
cess for cleaning inside the pipe. After cleaning, always make
sure that inspection caps are replaced tightly and that their
seals are undamaged and efficient.
b
Flue pipes must maintain a distance of at least 500 mm
from flammable or heat sensitive construction materials.
b
Joins must be sealed with materials that are resistant
to acid condensate and to the high temperatures of the
boiler's flue gases.
b
When installing flue pipes, always bear in mind the direc-
tion of the flue gases and of possible condensate flows.
b
Inadequate or badly dimensioned stacks and flues can
increase combustion noise, cause condensation prob-
lems and affect combustion parameters.
b
Uninsulated flues are potentially dangerous and can
cause burns.
BOILER CONFIGURATIONS C “SEALED”
If comburent air is drawn from outdoors, the appliances are
type C "sealed" and the boiler room does not require ventila-
tion.
Coaxial flues (Ø 80/125)
The boiler must be fitted with the relevant kit for use in these
configurations. (See the manual provided with the kit for instal-
lation instructions).
Coaxial flues can be oriented in whatever direction is most
convenient for the room, provided the maximum specified
lengths are respected.
G
C
T
L
A
A
Concentric flue kit
C
Condensation exhaust system (not supplied)
G
Protective grille (not supplied)
T
Terminal
L
Maximum straight length
(This length must be reduced by 1 metre for every
90° curve and by 0.5 metres for every 45° curve.)
Description
ACQUAHOME R BLU
L
7
m
