Bard WG3S2-A Installation Instructions Manual

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Bard WG3S2-A Installation Instructions Manual Manual pdf 26 page image

Manual 2100-587CPage 26 of 5918. GAS SUPPLY AND PIPINGGENERAL RECOMMENDATIONS1. Be sure the gas line complies with the local codesand ordinances, or in their absence with the NationalFuel Gas Code, ANSI Z223.1, or Natural GasInstallation Code, CAN/CGA B149.1, or PropaneInstallation Code B149.2, latest edition.2. A sediment trap or drip leg must be installed in thesupply line to the furnace.3. A ground joint union shall be installed in the gasline adjacent to and upstream from the gas valve anddownstream from the manual shut off valve.4. An 1/8” NPT plugged tapping accessible for testgauge connection shall be installed immediatelyupstream of the gas supply connection to the furnacefor the purpose of determining the supply gaspressure. This can be omitted if local codes permituse of plugged tapping in gas valve inlet.5. Install listed manual shut off valve in the supply gasline external to and immediately upstream of thefurnace. See Figure 11.6. Use steel or wrought iron pipe and fittings.7. DO NOT thread pipe too far. Valve distortion ormalfunction may result from excess pipe within thecontrol. Use pipe joint compound resistant to theaction of liquefied petroleum gases on male threadsonly. DO NOT use Teflon tape. See Table 5 andFigure 12.TABLE 5LENGTH OF STANDARDPIPE THREADS (INCHES)TABLE 6GAS PIPE SIZES - NATURAL GASCHECKING THE GAS PIPINGBefore turning gas under pressure into piping, allopenings from which gas can escape should be closed.Immediately after turning on gas, the system should bechecked for leaks. This can be done by watching the1/2 cubic foot test dial and allowing 4 minutes to showany movement, and by soaping each pipe connectionand watching for bubbles. If a leak is found, make thenecessary repairs immediately and repeat the above test.The furnace must be isolated from the gas supply pipingsystem by closing the manual shut off valve on thecombination gas control valve during pressure testingof the gas supply piping system at pressures up to 1/2PSIG. The furnace and its individual shut off valve mustbe disconnected from supply piping and supply pipingcapped during any pressure testing of supply pipingsystem at test pressures in excess of 1/2 PSIG.Defective pipes or fittings should be replaced and notrepaired. Never use a flame or fire in any form to locategas leaks; use a soap solution.After the piping and meter have been checkedcompletely, purge the system of air. DO NOT bleedair inside the furnace. Be sure to check and relight allthe gas pilots on other appliances that may have beenextinguished because of interrupted gas supply.FIGURE 12PROPER PIPING PRACTICE8. Refer to Table 6 for Gas Pipe Sizes for naturalgas. If more than one appliance is supplied from asingle line size, capacity must equal or exceed thecombined input to all appliances, and the branchlines feeding the individual appliances properly sizedfor each input.Pipe SizeEffectiveLength ofThreadOverall Lengthof Thread3/8 1/2 9/163/4 1/2 - - 9/16 13/161 9/16 1Lengthof Pipe -FeetPipe Capacity -BTU per Hour Input Pipe Size1/2" 3/4" 1" 1-1/4"10 132,000 278,000 520,000 1,050,00020 92,000 190,000 350,000 730,00030 73,000 152,000 285,000 590,00040 63,000 130,000 245,000 500,00050 56,000 115,000 215,000 440,00060 50,000 105,000 195,000 400,00070 46,000 96,000 180,000 370,00080 43,000 90,000 170,000 350,000100 38,000 79,000 150,000 305,000THIS PRODUCT MUST BE GAS PIPEDBY A LICENSED PLUMBER OR GASFITTER IN THE COMMONWEALTH OFMASSACHUSETTS.MIS-897