Carrier 48DU Installation Instructions Manual

Also see for 48DU Series: Owner's information manual

Contents

Carrier 48DU Installation Instructions Manual Manual pdf 2 page image

2Follow all safety codes. Installation must be in compliance withlocal and national building codes. Wear safety glasses, protectiveclothing, and work gloves. Have fire extinguisher available. Readthese instructions thoroughly and follow all warnings or cautionsincluded in literature and attached to the unit.Recognize safety information. This is the safety--alert symbol .When you see this symbol on the unit and in instructions or manuals,be alert to the potential for personal injury. Understand these signalwords: DANGER, WARNING, and CAUTION. These words areused with the safety--alert symbol. DANGER identifies the most se-rious hazards which will result in severe personal injury or death.WARNING signifies hazards which could result in personal injuryor death. CAUTION is used to identify unsafe practices which mayresult in minor personal injury or product and property damage.NOTE is used to highlight suggestions which will result in en-hanced installation, reliability, or operation.Always install furnace to operate within the intended temperaturerise range with a duct system which has an external static pressurewithin the allowable range, as specified in “Indoor Airflow Adjust-ments” section of these instructions. See furnace rating plate.ELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personal injuryor death.Before installing or servicing system, always turn off mainpower to system. There may be more than one disconnectswitch. Turn off accessory heater power switch if applicable.! WARNINGUNIT OPERATION AND SAFETY HAZARDFailure to follow this warning could result in personal injuryor equipment damage.Puron (R--410A) systems operate at higher pressures thanstandard R--22 systems. DO NOT use R--22 serviceequipment or components on Puron (R--410A) equipment.Ensure service equipment is rated for Puron (R--410A).WARNING!INTRODUCTIONThe 48DU packaged unit is a fully self--contained combinationCategory I gas heating/electric air conditioner designed for outdoorinstallation (See Fig. 1). Standard units are shipped in ahorizontal--discharge configuration for installation on aground--level slab or directly on the ground if local codes permit.Standard units can be converted to downflow (vertical) dischargeconfigurations for rooftop applications.Models with an N in the fifth position of the model number arededicated Low NOx units designed for California installations.These models meet the California maximum oxides of nitrogen(NOx) emissions requirements of 40 nanograms/joule or less asshipped from the factory and must be installed in California AirQuality Management Districts or any other regions in NorthAmerica where a Low NOx rule exists.NOTE: Low NOx requirements apply only to natural gasinstallations.RECEIVING AND INSTALLATIONStep 1—Check EquipmentIDENTIFY UNITThe unit model number and serial number are printed on the unitinformative plate. Check this information against shipping papers.INSPECT SHIPMENTInspect for shipping damage while unit is still on shipping pallet. Ifunit appears to be damaged or is torn loose from its anchorage, haveit examined by transportation inspectors before removal. Forwardclaim papers directly to transportation company. Manufacturer isnot responsible for any damage incurred in transit. Check all itemsagainst shipping list. Immediately notify the nearest Carrier officeif any item is missing. To prevent loss or damage, leave all parts inoriginal packages until installation.Step 2—Provide Unit SupportFor hurricane tie downs, contact distributor for details and PE(Professional Engineering) Certificate, if required.ROOF CURBInstall accessory roof curb in accordance with instructions shippedwith curb (See Fig. 4). Install insulation, cant strips, roofing, andflashing. Ductwork must be attached to curb.IMPORTANT: The gasketing of the unit to the roof curb is criticalfor a water tight seal. Install gasketing material supplied with theroof curb. Improperly applied gasketing also can result in air leaksand poor unit performance.Curb should be level to within 1/4 in. (See Fig. 2). This is necessaryfor unit drain to function properly. Refer to accessory roof curbinstallation instructions for additional information as required.ABCMAXIMUM ALLOWABLEDIFFERENCE (in.)A-B B-C A-C1/4 1/4 1/4C99065Fig. 2 -- Unit Leveling TolerancesSLAB MOUNTPlace the unit on a solid, level concrete pad that is a minimum of 4in. thick with 2 in. above grade. The slab should extendapproximately 2 in. beyond the casing on all 4 sides of the unit (SeeFig. 3). Do not secure the unit to the slab except when required bylocal codes.OPTIONALRETURNAIROPENINGOPTIONALSUPPLYAIROPENINGEVAP. COIL COND. COIL2"C99096Fig. 3 -- Slab Mounting DetailGROUND MOUNTThe unit may be installed either on a slab or placed directly on theground if local codes permit. Place the unit on level ground preparedwith gravel for condensate discharge.48DU