Carrier 58MCB Nstallation, Start-up, And Operating Instructions

Also see for 58MCB: User's information manual Service and maintenance instructions Owner's manual Service and maintenance instruction Installation, start-up, and operating instructions

Carrier 58MCB Nstallation, Start-up, And Operating Instructions Manual pdf 25 page image

-- 25 --supply/outlet or air conditioning coil casing (when used), wheninstalled on non-combustible material. When installed oncombustible material, supply-air duct attachment must ONLY beconnected to an accessory sub base or factory approved airconditioning coil casing. DO NOT cut main furnace casing toattach supply side air duct, humidifier, or other accessories. Allaccessories MUST be connected external to furnace main casing.Supply air opening duct flanges must be modified per Fig. 24.Horizontal 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). DONOT cut main furnace casing to attach supply side air duct,humidifier, or other accessories. All accessories MUST beconnected external to furnace main casing.RETURN AIR CONNECTIONSThe furnace and its return air system shall be designed andinstalled so that negative pressure created by the air circulatingfan cannot affect another appliance’s combustion air supply or actto mix products of combustion with circulating air and the aircirculating fan of the furnace, if installed in an enclosurecommunicating with another fuel-burning appliance not of thedirect-vent type, shall be operable only when any door or panelcovering an opening in the furnace fan compartment or in returnair plenum on ducts is in the closed position.Table 4 – Filter InformationAIR FILTER LOCATED IN BLOWER COMPARTMENTFURNACECASINGWIDTHIN (mm)FILTER SIZE --- IN (mm) FILTERTYPESide Return†* Bottom Return*17–1/2(445)(1) 16 X 25 X 3/4(406 X 635 X 19)(1) 16 X 25 X 3/4(406 X 635 X 19) Washable21 (533) (1) 16 X 25 X 3/4(406 X 635 X 19)1) 20 X 25 X 3/4(508 X 635 X 19) Washable24–1/2(622)(1 or 2)16 X 25 X 3/4(406 X 635 X 19)(1) 24 X 25 X 3/4(610 X 635 X 19) Washable*Alternate sizes and additional filters can be ordered from your distributor ordealer.† Upflow only. Alternate sizes and additional filters may be ordered fromyour dealer.FIRE HAZARDA failure to follow this warning could result in fire, personalinjury, or death.Never connect return-air ducts to the back of the furnace.Return-air duct connections on furnace side(s) permitted inupflow applications only.! WARNINGUpflow FurnacesThe return-air duct must be connected to end, sides (left or right),or a combination of end and side(s) of main furnace casing asshown in Fig. 2. Bypass humidifier may be attached into unusedside return air portion of the furnace casing. DO NOT connectany portion of return-air duct to back of furnace casing.Downflow and Horizontal FurnacesThe return-air duct must be connected to end inlet openingprovided as shown in Fig. 2. DO NOT cut into casing sides orback to attach any portion of return-air duct. Bypass humidifierconnections should be made at ductwork or coil casing sidesexterior to furnace.Step 5 -- Filter ArrangementFIRE, CARBON MONOXIDE AND POISONINGHAZARDFailure to follow this warning could result in fire, personalinjury, or death.Never operate a unit without a filter or with filter accessdoor removed.! WARNINGDetermine location for filter and relocate filter retaining wire ifnecessary. See Table 4 to determine correct filter size for desiredfilter location. Table 4 indicates filter size and location for thisfurnace. See Fig. 2 for location and size of bottom and sidereturn-air openings.CUT HAZARDFailure to follow this caution may result in minorpersonal injury.Use care when cutting support rods in filters to protectagainst flying pieces and sharp rod ends. Wear safety glasses,gloves, and appropriate protective clothing.CAUTION!A08604Fig. 26 -- Filter Installed for Side InletUNIT MAY NOT OPERATEFailure to follow this caution may result in intermittentunit operation.For airflow requirements above 1800 CFM, see Air Deliverytable in Product Data literature for specific use of single sideinlets. The use of both side inlets, a combination of 1 sideand the bottom, or the bottom only will ensure adequatereturn air openings for airflow requirements above1800 CFM.CAUTION!NOTE: Side return-air openings can ONLY be used inUPFLOW configurations. Install filter(s) as shown in Fig. 26.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. 27.58MCB