Carrier 58MVP Installation, Start-up, And Operating Instructions Manual

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Carrier 58MVP Installation, Start-up, And Operating Instructions Manual Manual pdf 19 page image

made in accordance with NSCNGPIC and all authorities havingjurisdiction. Gas supply line should be a separate line runningdirectly from meter to furnace, if possible. Refer to Table 3 forrecommended gas pipe sizing. Risers must be used to connect tofurnace and to meter. Support all gas piping with appropriatestraps, hangers, etc. Use a minimum of 1 hanger every 6 ft. Jointcompound (pipe dope) should be applied sparingly and only tomale threads of joints. Pipe dope must be resistant to propane gas.Connect gas pipe to furnace using a backup wrench to avoiddamaging gas controls.Gas valve shutoff switch MUST be facing forward or tiltedupward. Failure to follow this warning could result inproperty damage or death.Never purge a gas line into a combustion chamber. Never testfor gas leaks with an open flame. Use a commerciallyavailable soap solution made specifically for the detection ofleaks to check all connections. A failure to follow thiswarning could result in fire, explosion, personal injury, ordeath.Use proper length of pipe to avoid stress on gas controlmanifold. Failure to follow this warning could result in a gasleak resulting in fire, explosion, personal injury, or death.Install a sediment trap in riser leading to furnace. Trap can beinstalled by connecting a tee to riser leading to furnace sostraight-through section of tee is vertical. Then connect a cappednipple into lower end of tee. Capped nipple should extend belowlevel of gas controls. Place a ground joint union between gascontrol manifold and manual gas shutoff valve. (See Fig. 27.)If a flexible connector is required or allowed by authorityhaving jurisdiction, black iron pipe shall be installed atfurnace gas control valve and extend a minimum of 2 in.outside furnace casing.An accessible manual shutoff valve MUST be installed external tofurnace casing and within 6 ft of furnace. A 1/8-in. NPT pluggedtapping, accessible for test gage connection, MUST be installedimmediately upstream of gas supply connection to furnace anddownstream of manual shutoff valve.NOTE: The gas valve inlet pressure tap connection is suitable touse as test gage connection providing test pressure DOES NOTexceed maximum 0.5 psig (14-in. wc) stated on gas valve. (SeeFig. 62.)Piping should be pressure and leak tested in accordance withNFGC in the United States or NSCNGPIC in Canada, local, andnational plumbing and gas codes before the furnace has beenconnected. If pressure exceeds 0.5 psig (14-in. wc), gas supplypipe must be disconnected from furnace and capped beforepressure test.If test pressure is equal to or less than 0.5 psig (14-in. wc), turn offelectric shutoff switch located on gas valve before test. It isrecommended that ground joint union be loosened before pressuretesting. After all connections have been made, purge lines andcheck for leakage at furnace prior to placing it into service.The gas supply pressure shall be within the maximum andminimum inlet supply pressures marked on the rating plate withthe furnace burners ON at HI-HEAT and OFF.Fig. 26—Removing Bottom Closure PanelA93047BOTTOMCLOSUREPANELFRONT FILLERPANELTable 3—Maximum Capacity of Pipe*NOMINALIRONPIPESIZE(IN.)INTERNALDIAMETER(IN.)LENGTH OF PIPE (FT)10 20 30 40 501/2 0.622 175 120 97 82 733/4 0.824 360 250 200 170 1511 1.049 680 465 375 320 2851-1/4 1.380 1400 950 770 660 5801-1/2 1.610 2100 1460 1180 990 900* Cubic ft of gas per hr for gas pressures of 0.5 psig (14-in. wc) or less, anda pressure drop of 0.5-in. wc (based on a 0.60 specific gravity gas). Ref:Table 9-2 NFPA 54-2002.Fig. 27—Typical Gas Pipe ArrangementA93324UNIONSEDIMENTTRAPMANUALSHUTOFFVALVE(REQUIRED)GASSUPPLY19→→→