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

Also see for 58CVA: Installation, start-up, operating and service and maintenance instructions Installation, start-up, operating and service and maintenance instructions Installation, start-up, operating and service and maintenance instructions Installation, start-up, operating and service and maintenance instructions Product data

Carrier 58CVA Installation, Start-up, Operating And Service And Maintenance Instructions Manual pdf 14 page image

For a furnace not equipped with a cooling coil, the outlet duct shallbe provided with a removable access panel. This opening shall beaccessible when the furnace is installed and shall be of such a sizethat the heat exchanger can be viewed for possible openings usinglight assistance or a probe can be inserted for sampling the airstream.DUCTWORK ACOUSTICAL TREATMENTInstallation tip: Metal duct systems that do not have a 90 degreeelbow and 10 ft of main duct to the first branch take-off mayrequire internal acoustical lining. As an alternative, fibrous duct-work may be used if constructed and installed in accordance withthe latest edition of SMACNA construction standard on fibrousglass ducts. Both acoustical lining and fibrous ductwork shallcomply with NFPA 90B as tested by UL Standard 181 for Class 1Rigid air ducts.SUPPLY AIR CONNECTIONSUpflow and Horizontal FurnacesConnect supply-air duct to flange on furnace supply-air outlet.Bend flange upward to 90° with wide duct pliers. The supply-airduct attachment must ONLY be connected to furnace supply-outlet-air duct flanges or air conditioning coil casing (when used).DO NOT cut main furnace casing to attach supply side air duct,humidifier, or other accessories. All accessories MUST be con-nected external to furnace main casing. Supply air opening ductflanges must be modified per Fig. 14.Installation tip:For horizontal applications, the top most flangemay be bent past 90 degrees to allow the evaporator coil to hangon the flange temporarily while the remaining attachment andsealing of the coil are performed.Downflow FurnacesConnect supply-air duct to supply-air opening on furnace. Thesupply-air duct attachment must ONLY be connected to furnacesupply/outlet or air conditioning coil casing (when used). Wheninstalled on combustible material, supply-air duct attachment mustONLY be connected to the accessory subbase, KGASB0201ALL,or factory approved air conditioning coil casing. DO NOT cutmain furnace casing to attach supply side air duct, humidifier, orother accessories. All accessories MUST be connected external tofurnace casing. Supply air opening duct flanges must be modifiedper Fig. 14.RETURN AIR CONNECTIONSNever connect return-air ducts to the back of the furnace. Afailure to follow this warning can cause a fire, personal injury,or death.Downflow FurnacesThe return-air duct must be connected to return-air opening(bottom inlet) as shown in Fig. 1. DO NOT cut into casing sides(left or right). Side opening is permitted for only upflow andcertain horizontal furnaces. Bypass humidifier connections shouldbe made at ductwork or coil casing sides exterior to furnace. (SeeFig. 19.)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. 1. Bypass humidifier may be attached intounused side return air portion of the furnace casing. See Fig. 18and 20.Not all horizontal furnace models are approved for side return airconnections. See Fig. 20.Step 6—Gas PipingGas piping must be installed in accordance with national and localcodes. Refer to current edition of NFGC in the U.S. and theNSCNGPIC in Canada.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.Refer to Table 4 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. Joint compound (pipe dope) should be applied sparinglyand only to male threads of joints. Pipe dope must be resistant tothe action of propane gas.If a flexible connector is required or allowed by the authorityhaving jurisdiction, black iron pipe shall be installed at thegas valve and extend a minimum of 2 in. outside the furnace.Use a new flexible connector for each installation. Neverre-use an old flexible connector.Connect gas pipe to furnace using a backup wrench to avoiddamaging gas controls.Never purge a gas line into a combustion chamber. Never usematches, candles, flame, or other sources of ignition forpurpose of checking leakage. Use a commercially availablesoap-and-water solution to check for leakage. A failure tofollow this warning could result in fire, explosion, personalinjury, 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 as shown in Fig21. Connect a capped nipple into lower end of tee. Capped nippleshould extend below level of gas controls. Place a ground jointunion between gas control manifold and manual gas shutoff valve.A 1/8-in. NPT plugged tapping, accessible for test gage connec-tion, MUST be installed immediately upstream of gas supplyconnection to furnace and downstream of manual shutoff valve.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 1.049 680 465 375 320 285* Cubic tf if gas per hr for gas pressure of 0.5 psig (14–in wc) or less, and apressure drop of 0.5–in wc (based on a 0.60 specific gravity gas).Ref: Table 9.2 NFGC.13