Assessments - 2, GPA: 4.5 ( )

Fabricante : Wayne Arquivo Tamanho: 243.87 kb Arquivo Nome : Língua de Ensino:

in. (645.2 mm2) for each directly to outdoor air. 1,000 Btu (.2931 kW) (.2931 kW) per hourper hour input. Attic Ventilation Louvers are required at each end of attic with alternate air inlet No. 1. 1, 2, and 3 mark alternate locations for air from outdoors. Free area shall be not less than 1 Sq. in. (645.2 mm2) per 5,000 Btu (.1.465 kW) per hour of the total per hour of the total input rating of all appliances in the enclosure. Crawl-space Ventilation Louvers for unheated crawl space are required with alternate air inlet No. 3. Each Ventilation Air Opening from inside the building shall have a free area of not less than 1 Sq. in. (645.2 mm2) per 5,000 Btu (.1.465 kW) per hour of the Ventilating Air Opening total per hour of the total input rating of all appliances in the 1 Sq. in. (645.2 mm2) for each 1,000 Btu enclosure. input. Application located in confined spaces. Ventilation air from inside building - combustion and draft hood dilution air from outside. Ventilated attic or ventilated craw space. Illustration showing air opening necessary to supply air for combustion when heating appliance is installed in an enclosed room. FIGURE 1 2 1/2” (12.7 mm) 1/2” (12.7 mm) FIGURE 2 FIGURE 3 Minimum rise 1/4” (6.35 mm) to the foot (.305 m) Minimum rise 1/4” (6.35 mm) to the foot (.305 m) Minimum rise 1/4” (6.35 mm) to the foot (.305 m) 90° (1.57 rad) ANGLE TYPE DRAFT HOOD (Always install in a vertical position) FIGURE 4 3 PREPARATION OF FURNACE OR BOILER Clean combustion chamber thoroughly. Scrape and brush all heating surfaces and flue ways. Soot and fly ash are excellent insulators and unless removed the efficiency of the heating plant will be impaired. Plugged or restricted flue passages will prevent burner from operating properly. Be sure water column and gauge on boiler is clean and water level is visible. In all cases make sure the pigtail to limit control is clear. Safety pop valves on team boilers and automatic relief valves on closed water systems should be thoroughly checked to make sure they are in good working condition. FLUE PIPE AND DRAFT HOOD A CSA type draft hood or its equivalent shall be placed in and made part of the flue pipe from the appliance. At no time should the draft hood be located at a point lower than the highest flue passage in the appliance. The draft hood should be installed in the position for which it was designed and in no case installed in a false ceiling, separate room from the heating appliance, or in any other manner that will permit a difference in pressure between the draft hood relief opening and the combustion air supply. On sealed type appliances where all combustion air is taken from the outside, a cap should be installed on end of flue pipe to prevent back drafts. In such cases no draft hood or diverter should be installed inside. See Figure 4. When converting oil fire appliances the flue pipe and draft hood or diverter used should be the same size as the furnace flue collar. It is recommended that a rise as great as possible or at least 1/4 inch (6.35mm) to the foot (.305m) (horizontal length) be maintained in the flue pipe from the appliance to the chimney. The flue pipe should be relocated where possible to avoid sharp turns. DRAFT HOOD & FLUE PIPE SIZES FOR GAS CONVERSION BURNERS IN UP-DRAFT COAL FURNACES ND BOILERS Not more than 6,500 BTU (1.905 kW) per inch (645.2 mm2) of the flue area Input - BTU (kW) Per Hour Draft Hood and Flue Pipe Size Up to --- 120,000 (35.17) 120,000 (35.17) --- 180,000 (52.75) 180,000 (52.75) --- 250,000 (73.27) 5 inch (127mm) 6 inch (152.4mm) 7 inch (177.8mm) NOTE: If the flue pipe exceeds 10 ft. (3.048m) in length, or contains more than two elbows, use next size larger pipe and draft hood. NO MOVEABLE FLUE PIPE DAMPER SHOULD BE USED ON ANY INSTALLATION. NOTE: All installations must operate with negative draft overfire. Refer to your local gas company and codes for assistance. REVERTIBLE FLUE (DOWN DRAFT OR DIVING FLUE TYPE) FURNACES OR BOILERS When installing the burner in the above type furnaces or boilers, the draft hood (or draft diverter) should be located at least one foot higher than the top of the highest point of the appliance flue passage or combustion chamber. It is also recommended that a vent pipe, not less than one inch in diameter, be provided from the highest point in the flue passage, directly to the flue pipe. This is not necessary on the appliances with built in up draft bypass. (See Figure 3.) The gas company serving the area should be consulted in regards to their recommendations for converting this type of furnace or boiler. The flue pipe should be securely supported and the joints fastened with sheet metal screws or riveted to prevent sagging, and in no case should be located in a manner that will present a hazard to combustible building material. (Refer to local building code.) PREPARATION OF COMBUSTION CHAMBER THE POWER GAS BURNER IS DESIGNED FOR “INSHOT” FIRING INTO A REFACTORY LINED COMBUSTION CHAMBER CONSTRUCT...

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