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Hersteller: Lennox International Inc. Dateigröße: 2.2 mb Dateiname: Unterrichtssprache:

11 -Vent connectors shall be firmly attached to the furnace flue collar by self-drilling screws or other approved means, except vent connectors of listed type B vent material which shall be assembled according to the manufacturer's instructions. Joints between sections of single wall connector piping shall be fastened by screws or other approved means. 12-When the vent connector used for Category I appliances must be located in or pass through a crawl- space or other areas which may be cold, that portion of the vent connector shall be constructed of listed double-wall type B vent material or material having equivalent insulation qualities. 13 -All venting pipe passing through floors, walls, and ceilings must be installed with the listed clearance to combustible materials and be fire stopped according to lo cal codes. In absence of local codes, refer to NFGC (Z223.1). 14 -No portion of the venting system can extend into, or pass through any circulation air duct or plenum. 15 -Vent connectors serving Category I appliances shall not be connected to any portion of mechanical draft systems operating under positive pressure such as Category III or IV venting systems. 16 -If vent connectors are combined prior to entering the common vent, the maximum common vent capacity listed in the common venting tables must be reduced by 10%, the equivalent of one 90° elbow (0.90 x maximum common vent capacity). 17 -The common vent diameter must always be at least as large as the largest vent connector diameter. 18 -In no case, shall the vent connector be sized more than two consecutive table size diameters over the size of the draft hood outlet or flue collar outlet. 19 -Do not install a manual damper, barometric draft regulator or flue restrictor between the furnace and the chimney. 20 -When connecting this appliance to an existing dedicated or common venting system, you must inspect the venting system's general condition and look for signs of corrosion. The existing vent pipe size must conform to these instructions and the provided venting tables for the USA, and the appropriate venting tables in the standards of CSA B149 Natural Gas and Propane Installation Codes for Canada. If the existing venting system does not meet these requirements, it must be resized. Page 15 TABLE 3 Capacity of Type B Double-Wall Vents with Type B Double-Wall Connectors Serving a Single Category I Appliance Vent and Connector Diameter -D (inches) Height Lateral 3 Inch 4 Inch 5 Inch 6 Inch HL (feet) (feet) Appliance Input Rating in Thousands of Btu Per Hour MIN MAX MIN MAX MIN MAX MIN MAX 0 0 78 0 152 0251 0375 2 13 51 18 97 27 157 32232 6 4 21 49 30 94 39 153 50227 6 25 46 36 91 47 149 59223 0 0 84 0 165 0276 0415 2 12 57 16 109 25 178 28 263 8 5 23 53 32 103 42 171 53 255 8 28 49 39 98 51 164 64247 0 0 88 0 175 0295 0447 2 12 61 17 118 23 194 26 289 10 5 23 57 32 113 41 187 52 280 10 30 51 41 104 54 176 67267 0 0 94 0 191 0327 0502 2 11 69 15 136 20 226 22 339 155 22 65 30 130 39 219 49 330 10 29 59 40 121 51206 64315 15 35 53 48 112 61 195 76301 0 0 97 0202 0349 0540 2 10 75 14 149 18 250 20 377 5 21 71 29 143 38 242 47 367 20 10 28 64 38 133 50229 62351 15 34 58 46 124 59217 73337 20 48 52 55 116 69206 84322 0 0 100 0213 0374 0587 2 9 81 13 166 14 283 18432 5 21 77 28 160 36 275 45 421 3010 27 70 37 150 48 262 59 405 15 33 64 44 141 57249 70389 20 56 58 53 132 66237 80374 30 NR NR 73 113 88 214 104 346 NOTE -Single appliance venting configurations withzero lateral lengths are assumed to have no elbows in the vent system. For all other vent configurations, the vent system is assumed to have two 90 ° elbows. For each additional 90 ° elbow or equivalent (for example two 45 ° elbows equal one 90 ° elbow) beyond two, themaximum capacitylistedintheventingtableshouldbereducedby10percent (0.90xmaxi mum listed capacity). Page 16 TABLE 4 Capacity of Type B Double-Wall Vents with Single-Wall Metal Connectors Serving a Single Category I Appliance Vent and Connector Diameter -D (inches) Height Lateral 3 Inch 4 Inch 5 Inch 6 Inch HL (feet) (feet) Appliance Input Rating in Thousands of Btu Per Hour MIN MAX MIN MAX MIN MAX MIN MAX 0 38 77 59 151 85 249 126 373 2 39 51 60 96 85 156 123 231 6 4 NR NR 74 92 102 152 146 225 6 NR NR 83 89 114 147 163 220 0 37 83 58 164 83 273 123 412 2 39 56 59 108 83 176 121 261 8 5 NR NR 77 102 107 168 151 252 8 NR NR 90 95 122 161 175 243 0 37 87 57 174 82 293 120 444 2 39 61 59 117 82 193 119 287 10 5 52 56 76 111 105 185 148 277 10 NR NR 97 100 132 171 188 261 0 36 93 56 190 80 325 116 499 2 38 69 57 136 80 225 115 337 15 5 51 63 75 128 102216 144 326 10 NR NR 95 116 128 201 182 308 15 NR NR NR NR 158 186 220 290 0 35 96 54 200 78 346 114 537 2 37 74 56 148 78 248 113 375 5 50 68 73 140 100 239 141 363 20 10 NR NR 93 129 125 223 177 344 15 NR NR NR NR 155 208 216 325 20 NR NR NR NR 186 192 254 306 0 34 99 53 211 76 372 110 584 2 37 80 55 164 76 281 109 429 5 49 74 72 157 98 271 136 417 30 10 NR NR 91 144 122 255 171 397 15 NR NR...

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