Bard W24G3DA Installation Instructions Manual

Bard W24G3DA Installation Instructions Manual Manual pdf 27 page image

Manual 2100-631Page 27 of 538. 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 properlysized for each input.18. GAS SUPPLY AND PIPINGGeneral Recommendations1. Be sure the gas line complies with the local codesand ordinances, or in their absence with theNational Fuel Gas Code, ANSI Z223.1, or NaturalGas Installation Code, CAN/CGA B149.1, orPropane Installation 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 valveand downstream 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 thefurnace for the purpose of determining the supplygas pressure. This can be omitted if local codespermit use of plugged tapping in gas valve inlet.5. Install listed manual shut off valve in the supplygas line external to and immediately upstream ofthe furnace. See Figure 12.6. Use steel or wrought iron pipe and fittings.7. DO NOT thread pipe too far. Valve distortion ormalfunction may result from excess pipe withinthe control. Use pipe joint compound resistant tothe action of liquefied petroleum gases on malethreads only. DO NOT use Teflon tape. See Table5 and Figure 13. Checking 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 abovetest. The furnace must be isolated from the gas supplypiping system by closing the manual shut off valve onthe combination 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 bleed airinside the furnace. Be sure to check and relight allthe gas pilots on other appliances that may have beenextinguished because of interrupted gas supply.FIGURE 13PROPER PIPING PRACTICETABLE 5LENGTH OF STANDARDPIPE THREADS (INCHES)TABLE 6GAS PIPE SIZES – NATURAL GASPipe Size Effective Lengthof ThreadOverall Length ofThread3/8 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 79,000 150,000 305,000MIS-897THIS PRODUCT MUST BE GAS PIPEDBY A LICENSED PLUMBER OR GASFITTER IN THE COMMONWEALTH OFMASSACHUSETTS.