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

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Carrier 58MVP Installation, Start-up, And Operating Instructions Manual Manual pdf 20 page image

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 8—Electrical ConnectionsSee Fig. 28 for field wiring diagram showing typical field 115-vand 24-v wiring. Check all factory and field electrical connectionsfor tightness.Blower access door switch opens 115-v power to furnacecontrol. No component operation can occur. Do not bypass orclose switch with panel removed. Failure to follow thiswarning could result in personal injury or death.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. Failure to follow this caution will result in intermittentunit operation.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 4 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 4 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.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. Failure to follow thiswarning could result in electric shock, fire, or death.J-Box Relocation1. Remove 2 screws holding auxiliary J-box. (See Fig. 30.)2. Rotate J-box 180° and attach box to left side, using holesprovided.Fig. 27—Typical Gas Pipe ArrangementA93324UNIONSEDIMENTTRAPMANUALSHUTOFFVALVE(REQUIRED)GASSUPPLYTable 4—Electrical DataUNITSIZEVOLTS—HERTZ—PHASEOPERATINGVOLTAGE RANGE MAXIMUMUNITAMPSMINIMUMWIRESIZEMAXIMUM WIRELENGTH (FT)‡MAXIMUM FUSE ORCKT BKR AMPS**Maximum* Minimum*040-14 115—60—1 127 104 8.9 14 31 15060-14 115—60—1 127 104 8.9 14 31 15080-14 115—60—1 127 104 8.9 14 31 15080-20 115—60—1 127 104 13.8 12 32 20100-20 115—60—1 127 104 13.8 12 32 20120-20 115—60—1 127 104 13.8 12 32 20* Permissible limits of voltage range at which unit will operate satisfactorily.† Unit ampacity = 125 percent of largest operating component’s full load amps plus 100 percent of all other potential operating components’ (EAC, humidifier, etc.) fullload amps.‡ Length shown is as measured 1 way along wire path between unit and service panel for maximum 2 percent voltage drop.** Time-delay type is recommended.20→