Venting And Air Piping System; General Venting And Combustion Air Piping System - Riello Condexa PRO NA 75P Installation, Operation And Service Manual

2.13 Venting and air piping system

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WARNING: Do not connect this gas appliance with any other
appliance unless approved by the manufacturer.
Failure to comply with this WARNING could result in the
accumulation of carbon monoxide gas which can cause
severe personal injury or death.
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DANGER: The condensate discharge must be filled with wa-
ter or combustion gases will enter the room with a risk of an
excessive level of carbon monoxide which can cause severe
personal injury or death.
Make sure that the combustion air is not contaminated by:
− Permanent wave solutions;
− Chlorinated waxes/cleaners;
− Chlorine-based swimming pool chemicals;
− Calcium chloride;
− Sodium chloride used for water softening;
− Refrigerant leaks;
− Paint or varnish removers;
− Hydrochloric acid/muriatic acid;
− Cements and glues;
− Antistatic fabric softeners used in clothes dryers;
− Chlorine-type bleaches, detergents, and cleaning solvents
found in household laundry rooms;
− Adhesives used to fasten building products and other sim-
ilar products.
To prevent contamination do not connect the combustion air inlet
and exhaust near:
− Dry cleaning/laundry areas and establishments;
− Swimming pools;
− Metal fabrication plants;
− Beauty shops;
− Refrigeration repair shops;
− Photo processing plants;
− Auto body shops;
− Plastic manufacturing plants;
− Furniture refinishing areas and establishments;
− Remodeling areas;
− Garages with workshops.
2.13.1 General venting and combustion air piping
system
The Condexa PRO NA boilers require an approved vent sys-
tem-designed for positive pressure.
Vent connectors serving appliances vented by natural draft shall
not be connected to any portion of mechanical draft systems op-
erating under positive pressure.
Ensure that the flue pipes and seals are not damaged.
Use only primer and glue compounds approved for use with the
vent material used.
9
WARNING: Never install a barometric or a thermally controlled
vent damper with this boiler.
Do not route the flue system piping through or inside another
duct that is used for exhausting air or other flue gases.
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WARNING: The condensate trap must be primed at all times.
Failure to do so may allow combustion gases to escape into
boiler room, which may result in substantial property dam-
age, severe personal injury or death.
The unit is to be used for either direct vent installation or for in-
stallation using room air for combustion. When room air is used,
it is necessary to provide an adequate opening for the fresh air
intake.
The vent/air methods in this manual must be followed in their
entirety.
Be sure to locate the unit such that the vent and combustion air
piping can be routed through the building and properly termi-
nated.
The boiler/vent installation shall be in accordance with "Venting
of Equipment," of the National Fuel Gas Code, ANSI Z223.1/NFPA 54,
or "Venting Systems and Air Supply for Appliances," of the Natural
Gas and Propane Installation Code, CAN/CSA B149.1, or applicable
provisions of the local building codes.
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WARNING: All vent pipes must be installed in accordance with
the boiler manufacturer's installation instructions as well as
the vent manufacturer's instructions, failure to comply may
result in severe injury or death.
The exhaust vent and the combustion air inlet lines must be sup-
ported to prevent sagging per the vent manufacturer's instruc-
tions.
Do not mix components from different systems. The vent system
could fail, causing leakage of flue products into the living space.
Use only approved materials.
Use of cellular core PVC (ASTM F891), cellular core CPVC or Radel®
(polyphenolsulfone) in venting systems shall be prohibited.
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WARNING: Improper venting due to failure to comply with the
warnings above can result in excessive levels of carbon mon-
oxide, which may result in substantial property damage, se-
vere personal injury or death.
The exhaust pipe must be pitched a minimum of a 1/4 inch per
foot back to the boiler, or 2 cm for every 1 m (to allow drainage of
condensate).
The vent system shall be installed so as to prevent the accumula-
tion of condensate.
Consult local and state codes pertaining to special building code
and fire department requirements. Adhere to national code re-
quirements.
Observe the listed maximum lengths of vent system, which are
boiler model dependent.
To avoid moisture and frost build-up and to maintain clearances
to openings on adjacent structures, 45 ° and 90 ° elbows or tees
may be attached to the end of the vent termination pipe to direct
exhaust plumes away from the adjacent structure. The total al-
lowable vent length, maximum number of elbows and distance
to air intake restrictions must be adhered to.
Due to the high efficiency of the unit it may discharge what looks
like white smoke especially when the outside air temperature is
cold. This is due to the presence of water vapor, normally present
in the exhaust gases.
Provisions for combustion and ventilation air in accordance with
the section "Air for Combustion and Ventilation," of the Nation
Fuel Gas Code, ANSI Z223.1/NFPA 54, or Clause 8.2, 8.3 or 8.4 of Nat-
ural Gas and Propane Installation Code, CAN/CSA B149.1, or applica-
ble provisions of the local building codes.
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WARNING: Covering non-metallic vent pipe and fittings with
thermal insulation shall be prohibited.
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INSTALLATION