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

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nipple 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. 20.)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 gauge 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 gauge connection providing test pressure DOES NOTexceed maximum 0.5 psig (14-in. wc) stated on gas valve. (SeeFig. 47.)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.Step 6—Electrical ConnectionsSee Fig. 21 for field wiring diagram showing typical field 115-vand 24-v wiring. Check all factory and field electrical connectionsfor tightness.ELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personal injuryor death.Blower access door switch opens 115-v power to furnacecontrol. No component operation can occur. Do not bypass orclose switch with panel removed.UNIT MAY NOT OPERATEFailure to follow this caution may result in intermittent unitoperation.Furnace control must be grounded for proper operation orcontrol will lock out. Control is grounded throughgreen/yellow wire connected to gas valve and burner boxscrew.115-V WIRINGBefore proceeding with electrical connections, make certain thatvoltage, frequency, and phase correspond to that specified onfurnace rating plate. Also, check to be sure that service providedby power supply is sufficient to handle load imposed by thisequipment. Refer to rating plate or Table 5 for equipment electricalspecifications.Make all electrical connections in accordance with NationalElectrical Code (NEC) ANSI/NFPA 70-2002 and any local codesor ordinances that might apply. For Canadian installations, allelectrical connections must be made in accordance with CanadianElectrical Code CSA C22.1 or authorities having jurisdiction.Field-supplied wiring shall conform with the limitations of 63°F(33°C) rise.Use a separate branch electrical circuit containing a properly sizedfuse or circuit breaker for this furnace. See Table 5 for wire sizeand fuse specifications. A disconnecting means must be locatedwithin sight from and readily accessible to furnace.NOTE: Proper polarity must be maintained for 115-v wiring. Ifpolarity is incorrect, furnace control status code indicator light willflash rapidly and furnace will NOT operate.FIRE HAZARDFailure to follow this warning could result in intermittentoperation.Do not connect aluminum wire between disconnect switchand furnace. Use only copper wire. (See Fig. 22.)ELECTRICAL SHOCK AND FIRE HAZARDFailure to follow this warning coud result in electrical shock,fire, or death.The cabinet MUST have an uninterrupted or unbroken groundaccording to NEC ANSI/NFPA 70-2002 and Canadian Elec-trical Code CSA C22.1 or local codes to minimize personalinjury if an electrical fault should occur. This may consist ofelectrical wire or conduit approved for electrical ground wheninstalled in accordance with existing electrical codes. Do notuse gas piping as an electrical ground.Table 4—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. 20—Typical Gas Pipe ArrangementA93324UNIONSEDIMENTTRAPMANUALSHUTOFFVALVE(REQUIRED)GASSUPPLY19