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

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Carrier 58MCA Installation, Start-up, And Operating Instructions Manual Manual pdf 16 page image

The entire length of furnace MUST be supported whenfurnace is used in a horizontal position to ensure properdraining. When suspended, bottom brace supports sides andcenter blower shelf. When unit is supported from the ground,blocks or pad should support sides and center blower shelfarea.Step 4—Filter ArrangementNever operate unit without a filter or with blower accesspanel removed.Factory-supplied washable framed filters are shipped in blowercompartment. Determine location for filter and relocate filterretaining wire if necessary. See Table 2 to determine correct filtersize for desired filter location. Table 2 indicates filter size,location, and quantity shipped with this furnace. See Fig. 2 forlocation and size of bottom and side return-air openings.Air delivery above 1800 CFM requires that both sides, acombination of 1 side and bottom, or bottom only of furnacebe used for return air.NOTE: Side return-air openings can ONLY be used in UPFLOWconfigurations. Install filter(s) as shown in Fig. 18.Bottom return-air opening may be used with all 4 orientations.Filter may need to be cut to fit some furnace widths. Install filteras shown in Fig. 19.NOTE: Remove and discard bottom closure panel when bottominlet is used.Step 5—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. 20.)2. Rotate front filler panel downward to release holding tabs.3. Remove bottom closure panel.4. Reinstall front filler panel and screws.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.Table 2—Filter InformationFURNACECASINGWIDTH (IN.)FILTER SIZE (IN.)* FILTER TYPEFRAMEDSide Return Bottom Return17-1/2 (1) 16 X 25 X 1† (1) 16 X 25 X 1 Cleanable21 (1) 16 X 25 X 1 (1) 20 X 25 X 1† Cleanable24-1/2 (2) 16 X 25 X 1† (1) 24 X 25 X 1 Cleanable* Filters can be field modified by cutting frame as marked and folding todesired size. Alternate sizes can be ordered from your distributor or dealer.† Factory-provided with furnace.Fig. 18—Filter Installed for Side InletFILTERRETAINERWASHABLEFILTERA93045Fig. 19—Bottom Filter ArrangementA96030WASHABLEFILTERFILTERSUPPORTFILTERRETAINER241⁄2-IN. WIDECASINGS ONLY:CUT AND FOLDFACTORY-PROVIDEDFILTERS AS SHOWNTO DESIRED SIZE.171⁄2-IN. WIDECASINGS ONLY:INSTALL FIELD-SUPPLIEDFILTER FILLER STRIPUNDER FILTER.1″24 1/ 2″3″16