Riello Array AR 399 SE Installation, Operation And Service Manual page 69

APPENDIX
COMBUSTION AIR
Air supply is a direct requirement of ANSI 223.1, NFPA-54, CSA B149.1
and local codes. These codes should be consulted before a perma-
nent design is determined.
Array boilers utilize combustion air from the space in which they
are installed, or utilize combustion air ducted directly to the unit.
Ventilation air must be provided in either case.
Material
ABS
PVC Schedule 40
CPVC Schedule 40
Polypropylene
Single wall galvanised steel
In cold climates it is essential to provide a motorized air inlet
damper to control the supply of combustion air and prevent nui-
sance condensation.
The combustion air must be free of:
− 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
Whenever the environment contains these types of chemicals,
combustion air MUST be supplied from a clean area outdoors for the
protection and longevity of the equipment and warranty validation.
The more common methods of combustion air supply are outlined
in the following sections.
COMBUSTION AIR FROM OUTSIDE THE BUILDING
Air supplied from outside the building must be provided through two
permanent openings. For each unit these two openings must have a
free area in accordance with the requirements of CAN/CSA B149.1, Nat-
ural Gas and Propane Installation Code. The free area must take into
account restrictions such as louvers and bird screens.
Standard
ANSI/ASTM D1527
ANSI/ASTM D1785 or D2665
ANSI/ASTM F441
ULC S636
26 gauge
COMBUSTION AIR FROM INSIDE THE BUILDING
When combustion air is provided from within the building, it must
be supplied through two permanent openings in an interior wall.
Each opening must have a free area of not less than one square inch
per 1000 BTUH of total input or 3000 square inches of free area. The
free area must take into account any restrictions, such as louvers.
DUCTED COMBUSTION AIR
For ducted combustion air installations, the air ductwork must be
attached directly to the air inlet connection on the sheet metal
enclosure.
In a ducted combustion air application, the combustion air duct-
ing pressure losses must be taken into account when calculating
the total maximum allowable venting length.
For additional details, see "Appendix G - Venting Size Data".
69 69
RECYCLING AND DISPOSAL APPENDIX