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

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Carrier 58MVP Installation, Start-up, And Operating Instructions Manual Manual pdf 17 page image

Step 6—Gas PipingGas piping must be installed in accordance with national and localcodes. Refer to current edition of NFGC. Canadian installationsmust be made in accordance with NSCNGPIC and all authoritieshaving jurisdiction. Gas supply line should be a separate linerunning directly from meter to furnace, if possible. Refer to Table3 for recommended gas pipe sizing. Risers must be used to connectto furnace 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 usematches, candles, flame, or other sources of ignition forpurpose of checking leakage. Use a soap-and-water solutionto check for leakage. A failure to follow this warning couldresult in fire, explosion, personal injury, or death.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. 21.)If a flexible connector is required or allowed by authorityhaving jurisdiction, black iron pipe shall be installed at gasvalve and extend a minimum of 2 in. outside furnace casing.An accessible manual shutoff valve MUST be installed upstreamof furnace gas controls and within 6 ft of furnace. A 1/8-in. NPTplugged tapping, accessible for test gage connection, MUST beinstalled immediately upstream of gas supply connection tofurnace and downstream of manual shutoff valve.NOTE: The gas valve inlet press tap connection is suitable to useas test gage connection providing test pressure DOES NOT exceedmaximum 0.5 psig (14-in. wc) stated on gas valve. (See Fig. 51.)Piping should be pressure tested in accordance with local andnational plumbing and gas codes before furnace has been attached.In Canada, refer to current edition of NSCNGPIC. If pressureexceeds 0.5 psig (14-in. wc), gas supply pipe must be disconnectedfrom furnace and capped before pressure test. If test pressure isequal to or less than 0.5 psig (14-in. wc), turn off electric shutoffswitch located on gas valve before test. It is recommended thatground joint union be loosened before pressure testing. After allconnections have been made, purge lines and check for leakage.ELECTRICAL CONNECTIONSSee Fig. 22 for field wiring diagram showing typical field 115-vand 24-v wiring. Check all factory and field electrical connectionsfor tightness.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 through green wirerouted to gas valve and burner box screw.Step 1—115-v WiringBefore proceeding with electrical connections, make certain thatvoltage, frequency, and phase correspond to that specified on unitrating plate. Also, check to be sure that service provided by utilityis sufficient to handle load imposed by this equipment. Refer torating plate or Table 4 for equipment electrical specifications.Make all electrical connections in accordance with NECANSI/NFPA 70-1996 and any local codes or ordinances that mightapply. For Canadian installations, all electrical connections mustbe made in accordance with Canadian Electrical Code CSA C22.1or subauthorities having jurisdiction.Use a separate, fused branch electrical circuit containing a properlysized fuse or circuit breaker for this furnace. See Table 4 for wireTable 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 10-2 NFPA 54-1992.Fig. 21—Typical Gas Pipe ArrangementA93324UNIONSEDIMENTTRAPMANUALSHUTOFFVALVE(REQUIRED)GASSUPPLY17→