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

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

cut main furnace casing to attach supply side air duct, humidifier,or other accessories. All accessories MUST be connected externalto furnace main casing.RETURN AIR CONNECTIONSNever connect return-air ducts to the back of the furnace.Return-air duct connections on furnace side(s) permitted inupflow applications only. A failure to follow this warningcould result in fire, personal injury, or death.Upflow FurnacesThe return-air duct must be connected to bottom, sides (left orright), or a combination of bottom and side(s) of main furnacecasing. Bypass humidifier may be attached into unused side returnair portion of the furnace casing. DO NOT connect any portion ofreturn-air duct to back of furnace casing.Downflow and Horizontal FurnacesThe return-air duct must be connected to return-air openingprovided. DO NOT cut into casing sides or back to attach anyportion of return-air duct. Bypass humidifier connections shouldbe made at ductwork or coil casing sides exterior to furnace.Step 5—Filter ArrangementNever operate unit without a filter or with filter access doorremoved. Failure to follow this caution will result in inter-mittent unit operation or performance satisfaction.The air filter arrangement will vary due to application, furnaceorientation, and filter type. The filter may be installed in anexternal Filter/Media cabinet (if provided) or the furnace blowercompartment. Factory supplied washable filters are shipped in theblower compartment.If a factory-supplied external Filter/Media cabinet is provided,instructions for its application, assembly, and installation arepackaged with the cabinet. The Filter/Media cabinet can be usedwith the factory-supplied washable filter or a factory-specifiedhigh-efficiency disposable filter (see cabinet instructions).If installing the filter in the furnace blower compartment, deter-mine location for filter and relocate filter retaining wire, ifnecessary. See Table 2 to determine correct filter size for desiredfilter location. Table 2 indicates filter size, location, and quantityshipped with this furnace. See Fig. 2 for location and size ofbottom and side return-air openings.Use care when cutting support rods in filters to protect againstflying pieces and sharp rod ends. Wear safety glasses, gloves,and appropiate protective clothing. Failure to follow thiscaution will result in intermittent personal injury.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 side andthe bottom, or the bottom only will ensure adequate return airopenings for airflow requirements above 1800 CFM. Failureto follow this caution will result in intermittent unit operationor performance satisfaction.NOTE: Side return-air openings can ONLY be used in UPFLOWconfigurations. Install filter(s) as shown in Fig. 24.For bottom return-air applications, filter may need to be cut to fitsome furnace widths. Install filter as shown in Fig. 25.NOTE: Remove and discard bottom closure panel when bottominlet is used.Step 6—Bottom Closure PanelThese furnaces are shipped with bottom closure panel installed inbottom return-air opening. This panel MUST be in place when sidereturn air is used.To remove bottom closure panel, perform following:1. Tilt or raise furnace and remove 2 screws holding front fillerpanel. (See Fig. 26.)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 NFGC in the U.S. Canadian installations must bemade in accordance with NSCNGPIC and all authorities havingjurisdiction. Gas supply line should be a separate line runningdirectly from meter to furnace, if possible. Refer to Table 3 forrecommended gas pipe sizing. Risers must be used to connect tofurnace 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.Table 2—Filter InformationAIR FILTER LOCATED IN BLOWER COMPARTMENTFurnaceCasingWidth (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 (1 or 2) 16 X 25 X 1* (1) 24 X 25 X 1† Cleanable* Filters may be field modified by cutting filter material and support rods (3) infilters. Alternate sizes can be ordered from your distributor or dealer.† Factory-provided with furnace.Fig. 24—Filter Installed for Side InletA93045FILTERRETAINERWASHABLEFILTER18→→