York SUNLINE DCG Series Installation Manual

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York SUNLINE DCG Series Installation Manual Manual pdf 15 page image

290699-YIM-B-0607Unitary Products Group 15GAS PIPINGProper sizing of gas piping depends on the cubic feetper hour of gas flow required, specific gravity of the gasand the length of run. “National Fuel Gas Code” Z223.1(in U.S.A.) or the current Gas Installation Codes CSA-B149.1 (in Canada) should be followed in all casesunless superseded by local codes or gas utility require-ments. Refer to the Pipe Sizing Table 5.The heating value of the gas may differ with locality.The value should be checked with the local gas utility.NOTE: There may be a local gas utility requirementspecifying a minimum diameter for gas piping.All units require a 1/2” pipe connection at theentrance fitting.GAS CONNECTIONThe gas supply line can be routed through the knock-outs located on the front of the unit or through theopening provided in the unit's base. Refer to Figure 11to locate these access openings. Typical supply pipingarrangements are shown in Figures 4 and 5. Allshaded items are field-supplied.If gas supply line is routed through the unit's baseensure that the burner assembly can be removed formaintenance without disturbing the supply line. Thesupply piping and fittings must lie below the bottom gasmanifold to avoid interference with the burner assem-bly.Two grommets are shipped in the blower compartment(in parts bag taped to the blower housing) of every unitwith gas heat and should be used in the knockoutswhen the gas piping penetrates the front of the unit.After the gas supply piping has been installed, the bot-tom opening in the unit should be sealed to preventwater from leaking into the building.Gas piping recommendations:1. A drip leg and a ground joint union must beinstalled in the gas piping.2. When required by local codes, a manual shut-offvalve may have to be installed outside of the unit.3. Use wrought iron or steel pipe for all gas lines. Pipecompound should be applied sparingly to malethreads only.4. All piping should be cleaned of dirt and scale byhammering on the outside of the pipe and blowingout the loose dirt and scale. Before initial start-up,be sure that all of the gas lines external to the unithave been purged of air.5. The gas supply should be a separate line andinstalled in accordance with all safety codes asprescribed under “Limitations”. After the gas con-nections have been completed, open the mainshut-off valve admitting normal gas pressure to themains. Check all joints for leaks with soap solutionor other material suitable for the purpose. NEVERUSE A FLAME.TABLE 5: GAS PIPE SIZING1/2 in. 3/4 in. 1 in. 1-1/4 in.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 305NOMINAL IRON PIPE SIZELENGTH INFEETMaximum capacity of pipe in cubic feet of gas per hour. (Based upona pressure drop of 0.3 inch water column and 0.6 specific gravity gas).Natural gas may contain some propane. Pro-pane, being an excellent solvent, will quicklydissolve white lead or most standard commer-cial compounds. Therefore, a special pipecompound must be applied when wrought ironor steel pipe is used. Shellac base compoundssuch as Gaskolac or Stalastic, and compoundssuch as Rectorseal #5, Clyde's or John Cranemay be used.