valutazioni - 4, GPA: 4.5
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The National Fuel Gas Code, ANSI Z223.1 defines a confined space as a space whose volume is less than 50 cubic feet per 1,000 Btu per hour (4.8m3 per kw) of the aggregate input rating of all appliances installed in that space and an unconfined space as a space whose volume is not less than 50 cubic feet per 1,000 Btu per hour (4.8m3 per kw) of the aggregate input rating of all appliances installed in that space. Rooms communicating directly with the space in which the appliances are installed, through openings not furnished with doors, are considered a part of the unconfined space. The following example is for determining the volume of a typical area in which the BF-20 may be located and for determining if this area fits the definition of an unconfined space. The input of the BF-20 is 20,000 Btu per hour. Based on the 50 cubic feet per 1,000 Btu per hour formula, the minimum area that is an unconfined space for installation of the BF-20 is 1,000 cubic feet, 50 cubic feet x 20 = 1,000 cubic feet. To determine the cubic feet of the area in which the BF-20 is to be installed, measure the length, width and height of the area. Example: The area measures 16 feet in length, 8 feet in width and 8 feet in height, the area is 1,024 cubic feet. The BF-20 can be installed in this unconfined space with no requirement to provide additional combustion and ventilation air. Warning: If the area in which the heater may be operated is smaller than that defined as an unconfined space or if the building is of unusually tight construction, provide adequate combustion and ventilation air by one of the methods described in the National Fuel Gas Code, ANSI Z223.1, Section 5.3 or applicable local codes. Unusually Tight Construction The air that leaks around doors and windows may provide enough fresh air for combustion and ventilation. However, in buildings of unusually tight construction, you must provide additional fresh air. Unusually tight construction is defined as construction where: a. Walls and ceilings exposed to the outside atmosphere have a continuous water vapor retarder with a rating of one perm or less with openings gasketed or sealed, and b. Weatherstripping has been added on openable windows and doors, and c. Caulking or sealants are applied to areas such as joints around window and door frames, between sole plates and floors, between wall-ceiling joints, between wall panels, at penetrations for plumbing, electrical, and gas lines, and at other openings. If the heater is installed in a building of unusually tight construction, adequate air for combustion, ventilation and dilution of flue gases shall be provided in accordance with ANSI Z223.1/NFPA54. Page 6 16012-1-0504 GAS SUPPLY GAS SUPPLY The gas line can be routed either through the floor or wall. The gas line opening should be made at this time. Location of the opening will be determined by the position of floor joists and the valve and union used for servicing. Gas Supply Check all local codes for requirements, especially for the size and type of gas supply line required. Recommended Gas Pipe Diameter Pipe Length (Feet) Schedule 40 Pipe Inside Diameter Tubing, Type L Outside Diameter Nat. L.P. Nat. L.P. 0-10 1/2" 3/8" 1.3 cm 1.0 cm 1/2" 3/8" 1.3 cm 1.0 cm 10-40 1/2" 1/2" 1.3 cm 1.3 cm 5/8" 1/2" 1.6 cm 1.3 cm 40-100 1/2" 1/2" 1.3 cm 1.3 cm 3/4" 1/2" 1.9 cm 1.3 cm 100-150 3/4" 1/2" 1.9 cm 1.3 cm 7/8" 3/4" 2.2 cm 1.9 cm Note: Never use plastic pipe. Check to confirm whether your local codes allow copper tubing or galvanized. Note: Since some municipalities have additional local codes, it is always best to consult your local authority and installation code. 1 11/16" (43mm) TO WALL 3 9/16" (90mm) Figure 1 Installing a New Main Gas Cock Each appliance should have its own manual gas cock. A manual main gas cock should be located in the vicinity of the unit. Where none exists, or where its size or location is not adequate, contact your local authorized installer for installation or relocation. Compounds used on threaded joints of gas piping shall be resistant to the action of liquefied petroleum gases. The gas lines must be checked for leaks by the installer. This should be done with a soap solution watching for bubbles on all exposed connections, and if unexposed, a pressure test should be made. Never use an exposed flame to check for leaks. Appliance must be disconnected from piping at inlet of control valve and pipe capped or plugged for pressure test. Never pressure test with appliance connected; control valve will sustain damage! A gas valve and ground joint union should be installed in the gas line upstream of the gas control to aid in servicing. It is required by the National Fuel Gas Code that a drip line be installed near the gas inlet. This should consist of a vertical length of pipe tee connected into the gas line that is capped on the bottom in which condensation and foreign particles may collect. 16012-1-0504 Figure 2 Method of Installing a Tee Fitting Sedim...
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