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2.13 Flue gas exhaust and combustion air suction
To evacuate the combustion products, refer to UNI 7129-7131. Al-
ways comply with the local regulations of the fire brigade and gas
company, and with any possible municipal regulations.
It is essential for flue gas evacuation and boiler combustion air trans-
fer that only original pipes are used (apart from type C6, as long as
it is certified), and that the connection is made as explained in the
instructions supplied with the flue gas accessories. A single flue can
be connected to several appliances provided that every appliance
is the condensing type.
b
POWER EVO-X 50 DEP - 50
b
Do not connect this appliance's flue gas extraction pipes with
those of other appliances, unless this is specifically author-
ised by the manufacturer. Non-compliance with this precau-
tion may cause a build-up of carbon monoxide in the room
where the appliance is installed. This could jeopardise peo-
ple's health and safety.
b
For more information on discharge pipes for thermal mod-
ules connected in a cascade system, refer to the price list
catalogue and the instructions supplied with the relative ac-
cessories.
b
Make sure the combustion (intake) air is not contaminated
by:
− waxes/chlorinated detergents
− chemical products based on swimming pool chlorine
− calcium chloride
− sodium chloride use to soften water
− refrigerant leaks
− paint or varnish removers
POWER EVO-X 65 - 80
− hydrochloric acid/muriatic acid
− cements and glues
− anti-static softeners used in dryers
− chloride used for domestic or industrial applications as
detergent, whitener or solvent
− adhesives used to fix construction products etc.
b
To prevent contamination of the thermal module, do not install
suction line air intakes and flue gas discharge pipes near:
− dry-cleaners/laundry rooms and factories
− swimming pools
− metal processing plants
− beauty parlours
− fridge repair shops
− photo-processing facilities
− body-shops
− plastics manufacturing plants
− furniture construction areas and plants.
b
The condensing appliances described in this manual must be
installed with flue gas pipes complying with current legislation
and purposely designed for this specific use.
b
Check that pipes and joints are not damaged.
b
Joint seals must be made with materials that can withstand
the acidity of the condensate and the temperatures of the
flue gases.
b
Make sure the pipes are correctly assembled according to
the direction of the flue gases and the descent of any possi-
ble condensate.
b
Inadequate or incorrectly sized flue gas pipes may increase
combustion noise, create condensate extraction issues and
negatively impact on the combustion parameters.
b
Check that pipes are suitably far (min. 500 mm) from flamma-
ble or heat-sensitive construction elements.
b
Check that no condensate builds up along the pipe. To this
end, the pipe should have a gradient of at least 3° degrees to-
wards the appliance if there is a horizontal section. If the hori-
zontal section or the vertical one is more than 4 metre long, a
drain-trap for the condensate must be provided at the bottom
of the line. The height of the drain-trap must be at least equal
to "H" (see figure A page 34). The drain-trap discharge must
therefore be connected to the sewerage system.
a
It is forbidden to obstruct or choke the flue gas pipe, or the
combustion air suction pipe (if installed).
a
It is forbidden to use pipes not purposely designed for this
function, as the contact with the condensate would quickly
damage them.
Installing the flue gas pipes
− Position the discharge pipe so the connection is fully up
against the flue gas turret of the boiler.
32
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