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

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Carrier 58MCA Installation, Start-up, And Operating Instructions Manual Manual pdf 18 page image

NOTE: Remove and discard bottom closure panel when bottominlet is used.Step 6—Bottom Closure PanelThese furnaces are shipped with bottom enclosure panel installedin bottom return-air opening. This panel MUST be in place whenside return air is used.To remove bottom closure panel, perform following:1. Tilt or raise furnace and remove 2 screws holding front fillerpanel. (See Fig. 25.)2. Rotate front filler panel downward to release holding tabs.3. Remove bottom closure panel.4. Reinstall front filler panel and screws.Step 7—Gas PipingGas piping must be installed in accordance with national and localcodes. Refer to current edition of NFGC in the United States.Canadian installations must be made in accordance with NSCNG-PIC and all authorities having jurisdiction.Gas supply line should be a separate line running directly frommeter to furnace, if possible. Refer to Table 3 for recommendedgas pipe sizing. Risers must be used to connect to furnace and tometer. Support all gas piping with appropriate straps, hangers, etc.Use a minimum of 1 hanger every 6 ft. Joint compound (pipe dope)should be applied sparingly and only to male threads of joints. Pipedope 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. Use acommercially available soap solution made specifically forthe detection of leaks to check all connections. 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. 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. 26.)If a flexible connector is required or allowed by authorityhaving jurisdiction, black iron pipe shall be installed atfurnace gas valve and extend a minimum of 2 in. outsidefurnace casing.If local codes allow the use of a flexible gas appliance connector,always use a new listed connector. Do not use a connector whichhas previously served another gas appliance.Fig. 25—Removing Bottom Closure PanelA93047BOTTOMCLOSUREPANELFRONT FILLERPANELTable 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 12-2 NFPA 54-2002.Fig. 26—Typical Gas Pipe ArrangementA93324UNIONSEDIMENTTRAPMANUALSHUTOFFVALVE(REQUIRED)GASSUPPLY18→