From inside (document excerpt):
24ABA4 BasetSeries 14 Air Conditioner with Puronr Refrigerant 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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A04030 the environmentally sound refrigerant Carrier’s Air Conditioners with Puronr 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 Star r guidelines for energy efficiency. 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 Durability 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 total equivalent length, up to 200 feet condenser above evaporator, or up to 80 ft. evaporator above condenser (See Longline Guide for more information.) S Low ambient (down to –20_F) 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 MANUFACTUR ER T IFIED O ARI A RT S C CE UNIT AR Y AIR CO ISO 9001:2000 YING WITH PL OM NING ITIO ND the environmentally sound refrigerant A EQ RI UIP M E NT STA NDARD 21 0 REGISTERED 24ABA4 STANDARD FEATURES Feature Puron Refrigerant 14 SEER 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.