Assessments - 1, GPA: 4 ( )

Fabricante : Lennox International Inc. Arquivo Tamanho: 2.2 mb Arquivo Nome : Língua de Ensino:

Each opening must have a minimum free area of 1 square inch (645 mm2) per 1,000 Btu (.29 kW) per hour of total input rating of all gas-fired equipment in the confined space. Each opening must be at least 100 square inches (64516 mm2). One opening shall be within 12 inches (305 mm) of the top of the enclosure and one opening within 12 inches (305 mm) of the bottom. See figure 2. CHIMNEY OR GAS VENT If air from outside is brought in for combustion and ventilation, the confined space must have two permanent openings. One opening shall be within 12 inches (305 mm) of the top of the enclosure and one opening within 12 inches (305 mm) of the bottom. These openings must communicate directly or by ducts with the outdoors or spaces (crawl or attic) that freely communicate with the outdoors or indirectly through vertical ducts. Each opening shall have a minimum free area of 1 square inch (645 mm2) per 4,000 Btu (1.17 kW) per hour of total input rating of all equipment in the enclosure. See figures 3 and 4. When communicating with the outdoors through horizontal ducts, each opening shall have a minimum free area of 1 square inch (645 mm 2) per 2,000 Btu (.56 kW) per total input rating of all equipment in the enclosure. See figure 5. When ducts are used, they shall be of the same cross-sectional area as the free area of the openings to which they connect. The minimum dimension of rectangular air ducts shall be no less than 3 inches (75 mm). In calculating free area, the blocking effect of louvers, grilles, or screens must be considered. Ifthe design and free area of protective covering is not known for calculating the size opening required, it may be assumed that wood louvers will have 20 to 25 percent free area and metal louvers and grilles will have 60 to 75 percent free area. Louvers and grilles must be fixed in the open position or interlocked with the equipment so that they are opened automatically during equipment operation. EQUIPMENT IN CONFINED SPACE ALL AIR FROM OUTSIDE (Inlet Air from Crawlspace and Outlet Air to Ventilated Attic) VENTILATION LOUVERS (Each end of attic) I ...... I OUTLET FURNACE AIR WATER HEATER VENTILATION INLET LOUVERS AIR (For unheated crawl ! NO TE-The inlet and outlet air openings shall each have a free area of at least one square inch (645 mm 2) per 4, 000 Btu (1.17 kW) per hour of the total input rating of all equipment in the enclosure. FIGURE 3 Page 7 EQUIPMENT IN CONFINED SPACE ALL AIR FROM OUTSIDE CHIMNEY (All Air Through Ventilated Attic) OR GAS VENT_ VENTILATION LOUVERS (Each end of attic) FURNACE INLET AIR (Ends 12 in. above bottom) HEATER NO TE-The inlet and outlet air openings shall each have a free area of at least one square inch (645 mm 2)per 4,000 Btu (1.17 kW) per hour of the total input rating of all equip ment in the enclosure. FIGURE 4 A_ EQUIPMENT IN TT'_. JJ_ CONFINED SPACE I I "_'Y _ ALLAIRFROM OUTLET AIR I 1 FURNACE I1"- ,, IiiII II I III I II NOTE -Each air duct opening shall have a free area of at least o ne square inch (645 mm 2J per 2, 000 Btu (.59 kW) per hour of the total input rating of all equipment in the enclosure. If the equipment room is located against an outside wall and the air openings communicate directly with the outdoors, each opening shall have a free area of at least one square inch (645 mm 2) per4,000 Btu (1.17 kW) per hour of the total input rating of all other equipment in the enclosure. FIGURE 5 -&WARNING The G50UH(X) gas furnace can be installed as shipped in either the upfiow position or the horizontal position, with right-hand or left-hand air discharge. Select a location that allows for the required clearances that are listed on the unit nameplate. Also consider gas supply connections, electrical supply, vent connection, and installation and service clearances [24 inches (610 mm) at unit front]. The unit must be level. NOTE -1/3 hp blower motors are equipped with four flexible mounting legs. 1/2 hp blower motors are equipped with three flexible legs and one rigid leg. The rigid leg is equipped with a shipping bolt and a flat white plastic washer (rather than the rubber mounting grommet used with a flexible mounting leg). The bolt and washer must be removed before the furnace is placed into operation. After the bolt and washer have been removed, the rigid leg will not touch the blower housing. Upflow Applications Allow for clearances to combustible materials as indicated on the unit nameplate. Minimum clearances for closet or alcove installations are shown in figure 6. Upflow Application Installation Clearances Top Left Side Right Side Bottom Type of Vent Type C Type B1 Connector Top 1 in, (25 ram) 1 in, (25 ram) *Front 3 in, (76 ram) 3 in, (76 ram) Back0 0 Sides Ot 0 Vent 6 in. (152 ram) 1 in. (25 ram) Floor 05 0J; *Front clearance in alcove installation must be 24 in. (610 ram). Maintain a minimum of 24 in. (610 ram) for front service access. SFor installation on a combustible floor, do not install the furnace directly on carpeting, ti...

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