Carrier 58DLA Installation, Start-up, Operating And Service And Maintenance Instructions

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Carrier 58DLA Installation, Start-up, Operating And Service And Maintenance Instructions Manual pdf 17 page image

17Return Air ConnectionsFIRE HAZARDFailure to follow this warning could cause personal injury,death and/or property damage.Never connect return--air ducts to the back of the furnace.Follow instructions below.! WARNINGDownflow FurnacesThe return--air duct must be connected to return--air opening(bottom inlet) as shown in Fig. 19. DO NOT cut into casing sides(left or right). Side opening is permitted for only upflow and mosthorizontal furnaces. (See Fig. 19.) Bypass humidifier connectionsshould be made at ductwork or coil casing sides exterior tofurnace.Upflow and Horizontal FurnacesThe return--air duct must be connected to bottom, sides (left orright), or a combination of bottom and side(s) of main furnacecasing as shown in Fig. 18 and 20. Bypass humidifier may beattached into unused return air side of the furnace casing. (SeeFig. 18 and 20.)Not all horizontal furnaces are approved for side return airconnections. (See Fig. 20.)GAS PIPINGFIRE OR EXPLOSION HAZARDFailure to follow this warning could result in personalinjury, death, and/or property damage.Never purge a gas line into a combustion chamber. Nevertest for gas leaks with an open flame. Use a commerciallyavailable soap solution made specifically for the detectionof leaks to check all connections.! WARNINGFIRE OR EXPLOSION HAZARDFailure to follow this warning could result in personalinjury,death, and/or property damage.Use proper length of pipe to avoid stress on gas controlmanifold and a gas leak.! WARNINGFURNACE OVERHEAT HAZARDFailure to follow this caution may result in propertydamage.Connect gas pipe to gas valve using a backup wrench toavoid damaging gas controls and burner misalignment.CAUTION!Gas piping must be installed in accordance with national andlocal codes. Refer to current edition of NFGC.Installations must be made in accordance with all authoritieshaving jurisdiction. If possible, the gas supply line should be aseparate line running directly from meter to furnace.FIRE OR EXPLOSION HAZARDFailure to follow this warning could result in personalinjury, death, and/or property damage.If local codes allow the use of a flexible gas applianceconnector, always use a new listed connector. Do not use aconnector which has previously served another gasappliance. Black iron pipe shall be installed at the furnacegas control valve and extend a minimum of 2 in. (51 mm)outside the furnace.! WARNINGNOTE: In the state of Massachusetts:1. Gas supply connections MUST be performed by a li-censed plumber or gas fitter.2. When flexible connectors are used, the maximum lengthshall not exceed 36--in. (915 mm).3. When lever handle type manual equipment shutoff valvesare used, they shall be T--handle valves.4. The use of copper tubing for gas piping is NOT approvedby the state of Massachusetts.Refer to Table 6 for recommended gas pipe sizing. Risers must beused to connect to furnace and to meter. Support all gas pipingwith appropriate straps, hangers, etc. Use a minimum of 1 hangerevery 6 ft. (2 M) Joint compound (pipe dope) should be appliedsparingly and only to male threads of joints. Pipe dope must beresistant to the action of propane gas.An accessible manual equipment shutoff valve MUST beinstalled external to furnace casing and within 6 ft. (2 M) offurnace. A 1/8--in. (3 mm) NPT plugged tapping, accessible fortest gauge connection, MUST be installed immediately upstreamof gas supply connection to furnace and downstream of manualequipment shutoff valve.NOTE: The furnace gas control valve inlet pressure tapconnection is suitable to use as test gauge connection providingtest pressure DOES NOT exceed maximum 0.5 psig (14--In.W.C.) stated on gas control valve. (See Fig. 47.)Some installations require gas entry on right side of furnace (asviewed in upflow). (See Fig. 21.)Install a sediment trap in riser leading to furnace as shown in Fig22. Connect a capped nipple into lower end of tee. Capped nippleshould extend below level of furnace gas controls. Place a groundjoint union between furnace gas control valve and exteriormanual equipment gas shutoff valve. A 1/8--in. NPT pluggedtapping, accessible for test gauge connection, MUST be installedimmediately upstream of gas supply connection to furnace anddownstream of manual equipment shutoff valve.Piping should be pressure and leak tested in accordance withNFGC, local, and national plumbing and gas codes before thefurnace has been connected. After all connections have beenmade, purge lines and check for leakage at furnace prior tooperating furnace.If pressure exceeds 0.5 psig (14--In. W.C.), gas supply pipe mustbe disconnected from furnace and capped before and duringsupply pipe pressure test. If test pressure is equal to or less than0.5 psig (14--In. W.C.), turn off electric shutoff switch located onfurnace gas control valve and accessible manual equipmentshutoff valve before and during supply pipe pressure test. Afterall connections have been made, purge lines and check forleakage at furnace prior to operating furnace.The gas supply pressure shall be within the maximum andminimum inlet supply pressures marked on the rating plate withthe furnace burners ON and OFF.58DL