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Units are lightweight and install easily on a rooftop or a ground-level pad Convertible duct configuration Unit is designed for easy use in either downflow or horizontal applications Efficient operation High-efficiency design with SEERs (Seasonal Energy Efficiency Ratios) . of 10.0 and AFUE (Annual Fuel Utilization Efficiency) ratings as high as 81 0% All units have a minimum CSE (California Seasonal Efficiency) rating of 76% Copyright 1994 Carrier Corporation Form 48SS-2PD Energy-saving, direct-spark ignition saves gas by operating only when the room thermostat calls for heating. Standard units are furnished with natural gas controls. A low-cost, field-installed kit for propane conversion is available for all units Model 48SS units meet the California maximum oxides of nitrogen (NOJ emission requirements Durable, dependable components Compressors are designed for high efficiency Each compressor is hermetically sealed against contamination to help promote longer life and dependable operation. Each compressor also has vibration isolation to provide quiet operation All compressors have internal high-pressure and overcurrent protection Rotary compressors are standard on unit size 018 Reciprocating compressors are standard on unit sizes 024-042. Scroll compressors are standard on unit sizes 048 and 060 Monoport inshot burners produce precise air-to-gas mixture which provides for clean and efficient combustion The large monoport on the inshot (or injection type) burners seldom, if ever, needs cleaning All gas furnace components are accessible in one compartment Turbo-tubular heat exchangers are constructed of aluminized steel for corrosion resistance and optimum heat transfer for improved efficiency The tubular design permits hot gases to make multiple passes across the path of the supply air In addition, dimples located on the heat exchanger walls force the hot gases to stay in close contact with the walls, improving heat transfer. Direct-drive multispeed, PSC (permanent split capacitor) blower motor is standard on all models. Direct-drive, PSC condenser-fan motors are designed to help reduce energy consumption and provide for cooling operation down to 40 F outdoor temperature Refrigerant system is designed to provide dependability Liquid refrigerant strainers are used to promote clean, unrestricted operation. Each unit leaves the factory with a full refrigerant charge. Refrigerant service connections make checking operating pressures easier. ® 2 Evaporator and condenser coils are computer-designed for optimum heat transfer and cooling efficiency Condenser coil is fabricated of copper tube and aluminum fins and is located inside the unit for protection against damage for long life and reliable operation The condenser coil is internally mounted and protected by a composite grille. Copper fin coils are also available from the factory by special order. These coils are recommended in applications where aluminum fins are likely to be damaged due to corrosion and are ideal for sea-coast applications Low sound ratings ensure a quiet indoor and outdoor environment with sound ratings as low as 7 4 bels Easy to service cabinets provide easy accessibility to serviceable components during maintenance and installation Rounded corners are an important safety feature, and a high quality finish ensures an attractive appearance Optional base rails provide holes for rigging and handling as well as an elevated mounting frame that provides structural support for horizontal installations. Downflow option unit is converted for downflow at the factory to allow vertical ductwork connections Unit is equipped with base rail. Low and high voltage electrical entries allow low and high voltage to be brought in through either the front duct panel or rear flue panel Integrated gas control board provides safe and efficient control of heating and simplifies troubleshooting through its built-in diagnostic function Weatherized cabinets are constructed of heavy-duty, phosphated, zinc-coated prepainted steel capable of withstanding 500 hours in salt spray Interior surfaces of the evaporator/heat exchanger compartment are insulated to help keep the conditioned air from being affected by the outdoor ambient temperature and to provide improved air quality. (Conforms to American Society of Heating, Refrigeration and Air Conditioning Engineers [ASHRAE] No. 62P ) Sloped condensate pan permits an external drain Page Features/Benefits . . .... . . . . ..... 1,2 Model Number Nomenclature . ..................................... . 3 ARI Capacities ..... ............. 3,4 Physical Data ..... 5 Options and Accessories 6 Base Unit Dimensions 7-10 Accessory Dimensions . . . .... 11,12 Selection Procedure ..... . . . .13 Performance Data . ..... ................14-18 Typical Installation ............ ........... 19 Application Data................... . . . 19 Typical Control Wiring Schematic ..........20-22 Electrical Data 23 ...