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

Also see for GAS FURNACE 58MXA: User's information manual User manual Service and maintenance instructions User's information manual User's information manual

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

light assistance or a probe can be inserted for sampling the airstream. The cover attachment shall prevent leaks.Step 2—Ductwork Acoustical TreatmentMetal duct systems that do not have a 90 degree elbow and 10 ftof main duct to the first branch take-off may require internalacoustical lining. As an alternative, fibrous ductwork may be usedif constructed and installed in accordance with the latest edition ofSMACNA construction standard on fibrous glass ducts. Bothacoustical lining and fibrous ductwork shall comply with NFPA90B as tested by UL Standard 181 for Class 1 Rigid air ducts.Step 3—Supply Air ConnectionsUPFLOW FURNACESConnect supply-air duct to 3/4-in. flange on furnace supply-airoutlet. The supply-air duct attachment must ONLY be connectedto furnace supply-/outlet-air duct flanges or air conditioning coilcasing (when used). DO NOT cut main furnace casing to attachsupply side air duct, humidifier, or other accessories. All accesso-ries MUST be connected external to furnace main casing.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 non-combustible material. When installed on combus-tible material, supply-air duct attachment must ONLY be con-nected to an accessory subbase or factory approved air condition-ing coil casing. DO NOT cut main furnace casing to attach supplyside air duct, humidifier, or other accessories. All accessoriesMUST be connected external to furnace main casing. Supply airopening duct flanges must be modified per Fig. 21.HORIZONTAL FURNACESConnect supply-air duct to supply air opening on furnace. Thesupply-air duct attachment must ONLY be connected to furnaceFig. 21—Duct Flanges A93029NOYESYESPERFORATEDDISCHARGE DUCTFLANGE210°MINFig. 22—Crawlspace Horizontal ApplicationA93304NOTES:ANGLEIRON OREQUIVALENT(B)(A) ROD LOCATIONUSING DIMPLELOCATORS(SEE DIMENSIONALDWG FORLOCATIONS)13/16-IN. MAXALTERNATE SUPPORTLOCATION FROM BACKALTERNATE SUPPORTLOCATION 4-IN. MIN8-IN. MAX3⁄8-IN. ROD(A) (B)(A)(B)(B)(A)1. A 1 In. clearance minimum between top offurnace and combustible material.2. The entire length of furnace must besupported when furnace is used in horizontalposition to ensure proper drainage.(A) PREFERRED ROD LOCATION(B) ALTERNATE ROD LOCATIONDRAIN5 3⁄4″3/ 8-IN. HEX NUT& WASHER (4)REQD PER ROD16