Carrier 48N Series Installation Instructions Manual

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HEATING A COOLING48NPackaged Heating/Cooling UnitsInstallation InstructionsNOTE TO INSTALLER: Leave these instructions, the User'sManual, and Parts Replacement Guide with the unit afterinstallation.A WARNINGImproper installation, adjustment, alteration, service,maintenance, or use can cause carbon monoxide poison¬ing, explosion, fire, electric shock, or other occurrenceswhich may injure you or damage your property. Con¬sult a qualified installer, service agency, or the gas sup¬plier for information or assistance. The qualified agencymust use factory authorized kits and accessories whenmodifying this unit.NOTE: The installation of this unit must conform to theguidelines presented in these unit Installation Instructions.Read and become familiar with this publication before start¬ing the installation.INTRODUCTIONModel 48N Packaged Gas/Electric Unit is fully self-con¬tained, combination gas heating/electric cooling unitdesigned for outdoor installation. Model 48N may beinstalled either on a rooftop or ground-level slab. See Fig. 1.For rooftop downflow applications, an accessory roof¬mounting curb must be used.Model 48N Unit meets the California maximum oxides ofnitrogen (Nox) emission regulations.These units are equipped with an energy-saving, automatic,intermittent, electric spark ignition system that does nothave a continuously burning pilot. All units are manufac¬tured with natural gas controls.These units are designed for a minimum continuous returnair temperature of 60 °F. (dry bulb) or an intermittent opera¬tion down to 55°F. (dry bulb) such as when used with anight set back thermostat.Model 48N is A.G.A. and C.G.A. design-certified. SeeTables 2 thru 7 for the heating input ratings.These units are factory-charged with R-22 refrigerant.Installation is simple: connect gas supply, air ducts, high-and low-voltage wiring, condensate drain, and install a field-supplied air filter.All units can be connected into existing duct systems thatare properly sized and designed to handle an airflow of 350to 450 Cfm per each 12,000 Btuh of rated cooling capacity.See Tables 2 thru 7 for cooling and heating airflow require¬ments.NOTE: When installing any accessory item, see the manu¬facturer's Installation Instructions packaged with the ac¬cessory. The Qualified Agency must use factory authorizedkits or accessories when modifying this unit.Fig. 1 —Model 48NIMPORTANT—READ BEFORE INSTALLING1. This installation must conform with all applicable localand national codes.2. The power supply (volts, hertz, and phase) must corre¬spond to that specified on unit rating plate.3. The electrical supply provided by the utility must besufficient to handle load imposed by this unit.4. Refer to the 48N dimensional drawing for locations ofgas inlet, electrical inlets, condensate drain, duct con¬nections, and required clearances before setting unit inplace. Figs. 2 and 3.5. Locate the unit where the vent cap will be a minimumof 4-ft from openable windows or doors.6. This installation must conform with local buildingcodes and with the National Fuel Gas Code ANSIZ223.1-1984 and Addenda Z223.la-1987 (In Canada,CAN/CGA B149.1, (2)-M86) or NFPA 54-1984 TIA-54-84-1. Refer to Provincial and local plumbing orwastewater codes and other applicable local codes.7. For outdoor installation on wood flooring or on class A,B, C roof covering materials.GENERALModel 48N Packaged Gas/Electric Unit has been designedand tested in accordance with ANSI Z21.47-1987, ARIStandard 210-81, and ARI Standard 270-84, CAN/CGA-2.3-M86, CAN 1-2.17-M80, CAN 1-2.21-M85, CSA C22.2 No. 0-1982, No. 3-1979 and No. 119-M1985. The appliance designis certified by the American Gas Association (A.G.A.) andCanadian Gas Association (C.G.A.) for use with natural orLP (propane) gases with appropriate controls and orifices.Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.PC 101 Catalog No. 564-816 Printed in U.S.A. Form 48NT-9SI Pg 1 9-88 Replaces: 48NT-8SIBook 1 4Tab la la