Where directly communicating with the outdoors or where communicating to the outdoors through vertical ducts, each opening shall have a minimum free area of 1 square inch per 4000 Btu/h (0.0005 m 2/kW) of total input rating of all appliances in the enclosure.The openings shall communicate directly, or by ducts, with the outdoors or spaces that freely communicate with the outdoors, as follows: Two permanent openings, one commencing within 12 inches (305 mm) of the top of the enclosure and one commencing within 12 inches (305 mm) of the bottom of the enclosure, shall be provided. įIGURE 506.3 COMBUSTION AIR FROM ADJACENT INDOOR SPACES THROUGH INDOOR COMBUSTION AIR OPENINGS (0.004 m 2/kW) of total input rating of all appliances. The volumes of spaces in different stories shall be considered as communicating spaces where such spaces are connected by one or more permanent openings in doors or floors having a total minimum free area of 2 square inches per 1000 Btu/b. Combining spaces in different stories.The minimum dimension of air openings shall not be less than 3 inches (76 mm). One permanent opening shall commence within 12 inches (305 mm) of the top of the enclosure and one permanent opening shall commence within 12 inches (305 mm) of the bottom of the enclosure (see Figure 506.3). Each opening shall have a minimum free area of 1 square inch per 1000 Btu/h (0.002 m 2/kW) of the total input rating of all appliances in the space but not less than 100 square inches (0.065 m 2). Openings used to connect indoor spaces shall be sized and located in accordance with the following: 2 Solar water heaters shall be sized to meet the appropriate first-hour rating as shown in the table.1 The first-hour rating is found on the "Energy Guide" label.Gas-Fired, Above 75 000 Btu/h, Storage and Instantaneousįor SI units: 1000 British thermal units per hour = 0.293 kW TABLE 501.1(2) FIRST HOUR RATING 1 Number of Bathrooms Unlisted water heaters shall be permitted in accordance with Section 504.3.2. Listed appliances shall be installed in accordance with the manufacturer's installation instructions. A list of accepted water heater appliance standards is referenced in Table 501.1(1). No water heater shall be hereinafter installed that does not comply with the manufacturer's installation instructions and the type and model of each size thereof approved by the Authority Having Jurisdiction. The minimum capacity for storage water heaters shall be in accordance with the first-hour rating listed in Table 501.1(2). The outlet end of such tubing shall be fastened in place.The regulations of this chapter shall govern the construction, location, and installation of fuel-burning and other types of water heaters heating potable water, together with chimneys, vents, and their connectors. Be one nominal size larger than the size of the relief-valve outlet, where the relief-valve discharge piping is installed with insert fittings.Be constructed of those materials indicated in Section P2906.5 or materials tested, rated and approved for such use in accordance with ASME A112.4.1.Not have a threaded connection at the end of the piping.Terminate not more than 6 inches (152 mm) and not less than two times the discharge pipe diameter above the floor or waste receptor flood level rim.Discharge to a termination point that is readily observable by the building occupants.Discharge in a manner that does not cause personal injury or structural damage.Discharge to the floor, to the pan serving the water heater or storage tank, to a waste receptor or to the outdoors.Serve a single relief device and shall not connect to piping serving any other relief device or equipment.Not be smaller than the diameter of the outlet of the valve served and shall discharge full size to the air gap.Discharge through an air gap located in the same room as the water heater.Not be directly connected to the drainage system.The discharge piping serving a pressure relief valve, temperature relief valve or combination valve shall:
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |