From inside (document excerpt):
24ABA4 Base Series 14 Air Conditioner with Puron Refrigerant Sizes 18 to 60 (1 1/2 to 5 Nominal Tons) Product Data INDUSTRY LEADING FEATURES / BENEFITS Efficiency S 14 SEER/11 EER S Microtube Technologyt refrigeration system S Indoor air quality accessories available Sound S Sound level as low as 76 dBA Comfort S System supports Thermidistatt or standard thermostat controls Reliability S Puronr refrigerant – environmentally sound, won’t deplete the ozone layer and low lifetime servce cost.
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S Front-seating service valves S Scroll compressor S Internal pressure relief valve S Internal thermal overload S Filter drier S Balanced refrigeration system for maximum reliability the environmentally sound refrigerant Durability Carrier’s Air Conditioners with Puron r refrigerant provide a collection of features unmatched by any other family of equipment. The 24ABA has been designed utilizing Carrier’s Puron refrigerant. The environmentally sound refrigerant allows you to make a responsible decision in the protection of the earth’s ozone layer. Carrier’s air conditioning system with Puron refrigerant meets the Energy Starr guidelines for energy efficiency. WeatherArmort protection package: S Solid, Durable sheet metal construction S Dense wire coil guard S Baked-on, complete coverage, powder paint Applications S Long-line – up to 250 feet (76.20 m) total equivalent length, up to 200 feet (60.96 m) condenser above evaporator, or up to 80 ft. (24.38 m) evaporator above condenser (See Longline Guide for more information.) S Low ambient (down to -20_F/-28.9_C) with accessory kit Warranty S 5 year limited compressor warranty S 5 year limited parts warranty MODEL NUMBER NOMENCLATURE 1 N 2 2 N 4 3 A A Product Family A=RES AC 4 A B Tier B=Base 5 A/N A Major Series A=Puron 6 N 4 SEER 4=14 SEER 7 N 3 8 N 6 9 A/N A Variations A=Standard 10 A/N 0 Open 0=Not Defined 11 A/N 0 Open 0=Not Defined 12 N 3 Voltage 3=208/230 1 13 N 0 Series 0= Original Series Product Series 24=AC Cooling Capacity ISO 9001:2000 24ABA4 the environmentally sound refrigerant REGISTERED This product has been designed and manufactured to meet Energy StarĀ® criteria for energy efficiency when matched with appropriate coil components. However, proper refrigerant charge and proper air flow are critical to achieve rated capacity and efficiency. Installation of this product should follow all manufacturing refrigerant charging and air flow instructions. Failure to confirm proper charge and air flow may reduce energy efficiency and shorten equipment life. STANDARD FEATURES FEATURE Puron Refrigerant Maximum SEER Rating Scroll Compressor Dense Wire Coil Guard Field Installed Filter Drier Front Seating Service Valves Internal Pressure Relief Valve Internal Thermal Overload Long Line capability Low Ambient capability with Kit.