York DNZ 024 Installation Manual

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York DNZ 024 Installation Manual Manual pdf 10 page image

66433-YIM-B-100410 Unitary Products GroupGAS PIPINGProper sizing of gas piping depends on the cubic feet perhour of gas flow required, specific gravity of the gas and thelength of run. National Fuel Gas Code Z223.1 or CSA B149.1should be followed in all cases unless superseded by localcodes or gas company requirements. Refer to Tables 5 & 6.The heating value of the gas may differ with locality. Thevalue should be checked with the local gas utility.NOTE: There may be a local gas utility requirement specify-ing a minimum diameter for gas piping. All unitsrequire a 1/2 inch pipe connection at the gas valve.GAS CONNECTIONThe gas supply line can be routed through the hole locatedon the left side of the unit. Refer to Figure 6 to locate theseaccess openings. Typical supply piping arrangements areshown in Figure 4.Gas piping requirements:1. A drip leg and a ground joint union must be installed inthe gas piping.2. When required by local codes, a manual shut-off valvemay have to be installed outside of the unit.3. Use wrought iron or steel pipe for all gas lines. Pipe dopeshould be applied sparingly to male threads only.FIGURE 4 - EXTERNAL SUPPLY CONNECTIONEXTERNAL SHUT-OFF1/2x1/2GASCOCK1/2x1/2UNIONAUTOMATICGASVALVEDRIPLEG1/2-14NPTTABLE 5: NATURAL GAS PIPE SIZING CHART 11. Maximum capacity of pipe in cubic feet of gas per hour(based upon a pressure drop of 0.3 inch water columnand 0.6 specific gravity gas).LENGTHIN FEETNOMINAL INCHES IRON PIPE SIZE1/2” 3/4” 1” 1-1/4”10 132 278 520 1,05020 92 190 350 73030 73 152 285 59040 63 130 245 50050 56 115 215 44060 50 105 195 40070 46 96 180 37080 43 90 170 35090 40 84 160 320100 38 79 150 305TABLE 6: PROPANE (LP) GAS PIPE SIZINGCHART 11. Maximum capacity of pipe in thousands of BTU perhour (based upon a pressure drop of 0.5 inch water col-umn).LENGTHIN FEETNOMINAL INCHES IRON PIPE SIZE1/2” 3/4” 1” 1-1/4”10 275 567 1,071 2,20520 189 393 732 1,49630 152 315 590 1,21240 129 267 504 1,03950 114 237 448 91360 103 217 409 83470 96 196 378 77180 89 185 346 72490 83 173 322 677100 78 162 307 630