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

Also see for 58MSA Series: Service and maintenance instructions User manual Instruction manual Installation, start-up, and operating instructions Installation, start-up, and operating instructions

Carrier 58MSA Installation, Start-up, And Operating Instructions Manual Manual pdf 21 page image

connected. After all connections have been made, purge lines andcheck for leakage at furnace prior to operating furnace.If pressure exceeds 0.5 psig (14-in. wc), gas supply pipe must bedisconnected from furnace and capped before pressure test. If testpressure is equal to or less than 0.5 psig (14-in. wc), turn offelectric shutoff switch located on furnace gas valve and accessiblemanual shutoff valve before test.The gas supply pressure shall be within the maximum andminimum inlet supply pressures marked on the rating plate withthe furnace burners ON and OFF.ELECTRICAL CONNECTIONSSee Fig. 30 for field wiring diagram showing typical field 115-vand 24-v wiring. Check all factory and field electrical connectionsfor tightness.Field-supplied wiring shall conform with the limitations of 63°F(35°C) rise.Blower access panel door switch opens 115-v power tocontrol center. No component operation can occur. Do notbypass or close switch with panel removed. Failure to followthis warning 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 routed to gas valve and burner box screw.Failure to follow this caution will result in mior unit opera-tion.Step 1—115-v WiringBefore proceeding with electrical connections, make certain thatvoltage, frequency, and phase correspond to that specified on unitFig. 26—Bottom Filter ArrangementA00290WASHABLEFILTERFILTERSUPPORTFILTERRETAINER171⁄2-IN. WIDECASINGS ONLY:INSTALL FIELD-SUPPLIEDFILTER FILLER STRIPUNDER FILTER.1″24 1 /2″3″21-IN. WIDECASINGS ONLY:SUPPORT RODS (3)EXTEND 1/4" ON EACHSIDE OF FILTER ANDREST ON CASING FLANGEFig. 27—Removing Bottom Closure PanelA93047BOTTOMCLOSUREPANELFRONT FILLERPANELFig. 28—Typical Gas Pipe ArrangementA93324UNIONSEDIMENTTRAPMANUALSHUTOFFVALVE(REQUIRED)GASSUPPLYTable 3—Maximum Capacity of Pipe(Cu Ft Per Hr)*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* For gas pressures of 0.5 psig (14-in. wc) or less, and a pressure drop of0.5-in. wc (based on a 0.60 specific gravity gas). Ref: Table 9.2 NFGC.21→