Flue Gas Exhaust And Combustion Air Suction - Riello Condexa HPR 35 Instructions For The Installer And For The Technical Assistance Centre

INSTALLATION

2.13 Flue gas exhaust and combustion air suction

To evacuate the combustion products, refer to UNI 7129-
7131. Always comply with the local regulations of the fire
brigade and gas company, and with any possible mu-
nicipal regulations.
It is essential for flue gas evacuation and boiler combus-
tion air transfer that only original pipes are used (apart
from type C6, as long as it is certified), and that the con-
nection is made as explained in the instructions supplied
with the flue gas accessories. A single flue can be con-
nected to several appliances provided that every appli-
ance is the condensing type.
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CONDEXA HPR 35-45
CONDEXA HPR 55-70
9
Do not connect this appliance's flue gas extrac-
tion pipes with those of other appliances, unless
this is specifically authorised by the manufacturer.
Non-compliance with this precaution may cause a
build-up of carbon monoxide in the room where
the appliance is installed. This could jeopardise
people's health and safety.
9
For more information on discharge pipes for ther-
mal modules connected in a cascade system, refer
to the price list catalogue and the instructions sup-
plied with the relative accessories.
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Make sure the combustion (intake) air is not con-
taminated 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
− hydrochloric acid/muriatic acid
− cements and glues
− anti-static softeners used in dryers
− chloride used for domestic or industrial applica-
tions as detergent, whitener or solvent
− adhesives used to fix construction products etc.
9
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.
9
The condensing appliances described in this man-
ual must be installed with flue gas pipes complying
with current legislation and purposely designed for
this specific use.
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Check that pipes and joints are not damaged.
9
Joint seals must be made with materials that can
withstand the acidity of the condensate and the
temperatures of the flue gases.
9
Make sure the pipes are correctly assembled ac-
cording to the direction of the flue gases and the
descent of any possible condensate.
9
Inadequate or incorrectly sized flue gas pipes may
increase combustion noise, create condensate ex-
traction issues and negatively impact on the com-
bustion parameters.
9
Check that pipes are suitably far (min. 500 mm)
from flammable or heat-sensitive construction el-
ements.
9
Check that no condensate builds up along the pipe.
To this end, the pipe should have a gradient of at
least 3° degrees towards the appliance if there is a
horizontal section. If the horizontal 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 conden-
sate 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.
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