Assessments - 1, GPA: 4
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If the unconfined space is within a building of tight construction (buildings using the following construction; weather stripping, heavy insulation, caulking, vapor barrier, etc.), air for combustion, ventilation, and draft hood dilution must be obtained from outdoors or spaces freely communicating with the outdoors. The installation instructions for confined spaces in tightly constructed buildings must be followed to ensure adequate air supply. CONFINED SPACE (a) U. S. INSTALLATIONS When drawing combustion and dilution air from inside a conventionally constructed building to a confined space, such a space shall be provided with two permanent openings, ONE IN OR WITHIN 12 INCHES (30 CM) OF THE ENCLOSURE TOP AND ONE IN OR WITHIN 12 INCHES (30 CM) OF THE ENCLOSURE BOTTOM. Each opening shall have a free area of at least one square inch per 1000 Btuh (2,208 mm2of per kw) of the total input of all appliances in the enclosure, but not less than 100 square inches (645 cm2). 7 If the confined space is within a building of tight construction, air for combustion, ventilation, and draft hood dilution must be obtained from outdoors. When directly communicating with the outdoors or communicating with the outdoors through vertical ducts, two permanent openings, located in the aforementioned manner, shall be provided. Each opening shall have a free area of not less than one square inch per 4000 Btu/hr (551 mm2 per kw) of the total input of all appliances in the enclosure. If horizontal ducts are used, each opening shall have a free area of not less than one square inch per 2000 Btu/hr (1101 mm2 per kw)of the total input of all appliances in the enclosure. (B) CANADIAN INSTALLATIONS Ventilation of the space occupied by the boiler(s) shall be provided by an opening for ventilation air at the highest practical point communicating with outdoors. The total cross- sectional area shall be at least 10% of the area of the combustion air opening but in no case shall the cross-sectional area be less than 10 square inches (6500 mm.). In addition to the above, there shall be permanent air supply opening(s) having a cross-sectional area of not less than 1 square inch per 7,000 BTUH (315 mm./kw) up to and including 1,000,000 BTUH plus 1 square inch per 14,000 BTU (158 mm2/kw) in excess of 1,000,000 BTUH. This opening(s) shall be located at, or ducted to, a point neither more than 18" (450 mm) nor less than 6 inches (150 mm) above the floor level. Where power vented equipment is used in the same room as the boiler, sufficient air openings must be supplied. UNDERSIZED OPENINGS MAY RESULT IN INSUFFICIENT AIR FOR COMBUSTION. Where an exhaust fan is installed in the same room with a boiler, sufficient openings for air must be provided in the walls. UNDERSIZED OPENINGS WILL CAUSE AIR TO BE DRAWN INTO THE ROOM THROUGH THE CHIMNEY, CAUSING POOR COMBUSTION. SOOTING MAY RESULT WITH AN INCREASED RISK OF ASPHYXIATION. VENTING THE BOILER WARNING THE INSTRUCTIONS IN THIS SECTION ON VENTING THE BOILER MUST BE FOLLOWED TO AVOID CHOKED COMBUSTION OR RECIRCULATION OF FLUE GASES. SUCH CONDITIONS CAUSE SOOTING OR RISKS OF FIRE AND ASPHYXIATION. SINGLE WALL OR TYPE B VENTING MAY BE USED WITH THESE BOILERS. ALL LOCAL UTILITY, STATE/ PROVINCIAL, REGULATIONS ON VENTING MUST BE FOLLOWED. VENT SIZING, INSTALLATION AND TERMINATION SHALL BE IN ACCORDANCE WITH PART 7, VENTING OF EQUIPMENT, OF THE NATIONAL FUEL GAS CODE, ANSI Z223.1, OR SECTION 7, VENTING SYSTEMS AND AIR SUPPLY FOR APPLIANCES, OF THE CAN/CSA B149, INSTALLATION CODES, OR APPLICABLE PROVISIONS OF THE LOCAL BUILDING CODES. 1. DRAFT HOOD The integral draft hood, louvers or cabinetry must not be altered. Provision must be made if the boiler is installed in confined space or a small boiler room to accommodate draft hood spillage and avoid risks described above. The upper air opening called for in the AIR REQUIREMENTS section of this manual is for this purpose. 2. VENT CONNECTION The minimum distance from adjacent public walkways, adjacent buildings, openable windows and building openings shall not be less than those values specified in the National Fuel Gas Code, ANSI Z223.1 and/or CAN/CSA B149.1-00, Installation Codes: Stack or chimney must be a minimum height of 12" (305 mm) above the annual snow fall to prevent blockage. Building materials must not come in contact with combustion products from stack or chimney, due to the degrading properties of flue products. Materials may be protected from flue products by use of metal or copper sheeting. Flue products must have a minimum clearance of 4 feet (1.22 m) horizontally from, and in no case above or below, unless a 4-foot (1.22 m) horizontal distance is maintained, from electric meters, gas meters, regulators and relief equipment. The Canadian B149.1-00, Installation Code specifies a 6 foot horizontal vent terminal clearance to gas and electric meters and relief devices (this clearance is specified as 4 feet in the U.S. under the National Fuel Gas Code, ANS...
Este manual também é adequado para os modelos :Aquecedores de Água - DB/DW-720-1810 (816.07 kb)
Aquecedores de Água - DB/DW-720-1810 (816.07 kb)
Aquecedores de Água - DB/DW-720-1810 (816.07 kb)