COMBUSTION | AIR | AND INSTALLATION OF THE EXHAUST |
VENTILATION OPENINGS | AND AIR INTAKE SYSTEM | |
Provisions for combustion and ventilation air must be made in accordance with section 5.3, Air for Combustion and Ventilation, of the National Flue Gas Code, ANSI Z223.1, or Sections 7.2, 7.3 or 7.4 of CAN/CGA B149, Installation Codes, or applicable provisions of the local building codes.
CAUTION: BOILER DAMAGE AND OPERATIONAL FAILURES !
Due to insufficient or lacking openings for combustion air and/or ventilation of the boiler room. Provisions for combustion air and ventilation are always required, regardless whether the combustion air is taken from the outside (sealed combustion) or inside (room air for combustion). Insufficient ventilation of the boiler room can lead to high air temperatures.
This can result in boiler damage.
–Make sure that intake and exhaust openings are sufficiently sized and no reduction or closure of openings takes place.
–When the problem is not resolved, do not operate the boiler.
–Please note these restrictions and its dangers to the operator of the boiler.
WARNING: BOILER DAMAGE !
Due to contaminated air.
–Boiler must be clear and free from combustible materials, gasoline and other flammable vapors and liquids, and corrosive liquids and vapors. Never use chlorine and hydrocarbon containing chemicals (such as spray chemicals, solution and cleaning agents, paints, glues etc) in the vicinity of the boiler.
–Do not store and use these chemicals in the boiler room.
–Avoid excessive dust formation and
NOTICE: When one expects contaminated combustion air (near swimming pools, chemical cleaning operations and hair salons), sealed combustion operation is recommended.
DANGER: FIRE DANGER !
Due to flammable materials or liquids.
–Do not store flammable materials and liquids in the immediate vicinity of the boiler.
All Air from Inside the Building (room air)
The room shall be provided with two permanent openings communicating directly with an additional room(s). The total input of all gas utilization equipment installed in the combined space shall be considered in making this determination. Each opening shall have a minimum free area of 1 square inch per 1,000 Btu per hour of total input rating of all gas utilization equipment in the confined space, but no less than 100 square inches. One opening shall commence within 12 inches (305 mm) of the top, and one opening shall commence within 12 inches (305 mm) of the bottom of the enclosure. The minimum dimension of air openings shall be not less than 3 inches (75 mm).
All Air from Outdoor (sealed combustion)
The room shall be provided with two permanent openings, one commencing within 12 inches (305 mm) from the top, and one commencing within 12 inches (305 mm) from the bottom of the enclosure. The openings shall communicate directly, or by ducts, with the outdoors or spaces (crawl or attic) that freely communicate with the outdoors.
The minimum dimension of air openings shall be no less than 3 inches (75 mm).
1.Where directly communicating with the outdoors, each open- ing shall have a minimum free area of 1 square inch per 4,000 Btu/hr of total input rating of all equipment in the enclosure.
2.Where communicating with the outdoors through vertical ducts, each opening shall have a minimum free area of 1 square inch per 4,000 Btu/hr of total input rating of all equipment in the enclosure.
3.Where communicating with the outdoors through horizontal ducts, each opening shall have a minimum free area of 1 square inch per 2,000 Btu/hr of total input rating of all equipment in the enclosure.
4.Where ducts are used, they shall be of the same
NOTICE: Consult local and state codes pertaining to special building code and fire department requirements. Adhere to national code requirements.
NOTICE: Observe the listed maximum lengths of vent system, which are boiler model dependent. The maximum permissible lengths are listed in the main specification Tab. 5.
An optional concentric vent/air intake body can be used for the installation of a vertical venting system as well as for a horizontal venting system. The concentric vent/air intake body can be ordered through Raypak Inc.
The boiler can also be operated with separate air intake and exhaust piping.
The termination shall be at least 4 ft (1220 mm) for the U.S. and 6ft. (1830 mm) for Canada away from a gas utility meter, service regulator or the like (for room air applications only).
The termination shall terminate at least 4 ft (1220 mm) below, 4 ft (1220 mm) horizontally from, or 1 ft (305 mm) above any door, window, or gravity air inlet into any building.
Vent must be at least 12 inches (305 mm) above grade, anticipated snow line or roof surface (Canada 18” (457 mm) minimum). Vent termination must be at least 7 ft (2135 mm) above a public walkway (see Fig. 20).
Vent must be 3 ft (915 mm)above any forced air intake within 10 ft (3050 mm) (see Fig. 20).
Do not extend exposed vent pipe outside the building beyond recommended distance. Condensate could freeze and block vent pipe. Vent should terminate at least 3 ft (915 mm) away from adjacent walls, inside corners and below roof overhang.
It is not recommended to terminate vent above any door or window, condensate can freeze causing ice formations.
Do not use chimney as a raceway if another boiler or fireplace is vented into or through chimney.
All vent pipes must be glued, except for the flue gas adapter which is fix into place and the first connection to the flue gas adapter. Installed you can slide the pipe onto the adapter, properly supported and the exhaust pipe must be pitched a minimum of a ¼ inch per foot back to the boiler. This allows the condensate to drain away.
NOTICE:
-Do not use cellular core pipe.
-A minimum clearance of 4 feet horizontally from and in no case above and below, unless a
Below are approved examples of vertical and horizontal venting installation
-Place pipe supports every 5 feet (1525 mm) of horizontal run, beginning with support near boiler.
-Periodic cleaning of the vent terminal and
-The minimum covering wall thickness is 1" (25 mm).
-The maximum covering wall thickness is 16" (406 mm).
-For Direct venting properly reassembele and reseal the vent and
CAUTION: Vent connectors serving appliances vented by natural draft shall not be connected into any portion of mechanical draft systems operating under positive pressure.
Fig. 15A
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