York DHG180 Installation Instruction

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York DHG180 Installation Instruction Manual pdf 10 page image

035-17233-000-C-070210 Unitary ProductsL.P. UNITS, TANKS AND PIPINGAll gas heat units are shipped from the factory equipped fornatural gas use only. The unit may be converted in the fieldfor use with L.P./propane gas with accessory kit model num-ber 1NP0437.All L.P./propane gas equipment must conform to the safetystandards of the National Fire Protection Association.For satisfactory operation, L.P./propane gas pressure mustbe 8.8 inch W.C at the unit under full load. Maintaining propergas pressure depends on three main factors:1. The vaporization rate which depends on (a) the tempera-ture of the liquid and (b) the wetted surface area of thecontainer or containers.2. The proper pressure regulation. (Two-stage regulation isrecommended from the standpoint of both cost and effi-ciency.)3. The pressure drop in the lines between regulators andbetween the second stage regulator and the appliance.Pipe size required will depend on the length of the piperun and the total load of all appliances.Complete information regarding tank sizing for vaporization,recommended regulator settings, and pipe sizing is availablefrom most regulator manufacturers and L.P./propane gassuppliers.L.P./propane gas is an excellent solvent and special pipecompound must be used when assembling piping for this gasas it will quickly dissolve white lead or most standard com-mercial compounds. Shellac base compounds such as Rec-torseal #5 are satisfactory for this type of gas.TABLE 5: PIPE SIZING 1Length in FeetNominal Iron Pipe Size1 in. 1-1/4 in.10 520 1,05020 350 73030 285 59040 245 50050 215 44060 195 40070 180 37080 170 35090 160 320100 150 3051 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.)FIGURE 6 : EXTERNAL SUPPLY CONNECTIONEXTERNAL SHUT-OFFNatural gas may contain some propane. Propane,being an excellent solvent, will quickly dissolvewhite lead or most standard commercial com-pounds. Therefore, a special pipe compound mustbe applied when wrought iron or steel pipe is used.Shellac base compounds such as Gaskolac orStalastic, and compounds such as Rectorseal #5,Cyde's or John Crane may be used.FIGURE 7 : BOTTOM SUPPLY CONNECTIONEXTERNAL SHUT-OFF