From inside (document excerpt):
24APA7 Performancet 17 2 Stage Air Conditioner with Puronr Refrigerant 2 to 5 Tons Product Data INDUSTRY LEADING FEATURES / BENEFITS Efficiency S 14 — 18 SEER / 11.6 — 13.9 EER S Microtube Technologyt refrigeration system S Indoor air quality accessories available Sound S Sound level as low as 71 dBA Comfort S System supports Infinityt Control or standard 2–stage thermostat controls Reliability S Puronr refrigerant — environmentally sound, won’t deplete the ozone layer and low lifetime service cost.
the environmentally sound refrigerant Carrier’s Air Conditioners with Puronr refrigerant provide a collection of features unmatched by any other family of equipment. The 24APA7 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. This product has been designed and manufactured to meet Energy Starr criteria for energy efficiency when matched with appropriate coil components. Refer to the combination ratings in the Product Data for system combinations that meet Energy Starr guidelines. NOTE: Ratings contained in this document are subject to change at any time. Always refer to the AHRI directory (www.ahridirectory.org) for the most up- -date ratings -toinformation. S Front–seating service valves S 2–stage scroll compressor S Internal pressure relief valve S Internal thermal overload S Low pressure switch S High pressure switch S Filter drier S Crankcase Heater standard S Balanced refrigeration system for maximum reliability Durability WeatherArmort protection package: S Solid, Durable sheet metal construction S Steel louver coil guard S Baked–on, complete outer coverage, powder paint Applications S Long–line — up to 250 feet (76.2 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.) MODEL NUMBER NOMENCLATURE 1 N 2 2 N 4 3 A A Product Family A=RES AC 4 A P Tier P= Performance 5 A/N A Major Series A=Puron 6 N 7 SEER 7=17 SEER Nominal 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 Minor Series 0, 1, 2. Product Series 24=AC Cooling Capacity 24APA7 the environmentally sound refrigerant Use of the AHRI Certified TM Mark indicates a manufacturer’s participation in the program For verification of certification for individual products, go to www.ahridirectory.org. 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.