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From inside (document excerpt):
25HCA3 Comfortt 13 Series Heat Pump with Puronr Refrigerant 1 1/2 To 5 Nominal Tons (Sizes 18 To 60) Product Data INDUSTRY LEADING FEATURES / BENEFITS Efficiency S 13 SEER/ 10.1 — 10.8 EER/ 7.7 — 8.3 HSPF (Nominal) S Microtube Technologyt refrigeration system S Indoor air quality accessories available Sound S Sound level as low as 74 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 service cost.
the environmentally sound refrigerant Carrier’s heat pumps with Puronr refrigerant provide a collection of features unmatched by any other family of equipment. The 25HCA3 has been designed utilizing Carrier’s Puron refrigerant. The environmentally sound refrigerant allows consumers to make a responsible decision in the protection of the earth’s ozone layer. As an Energy Starr Partner, Carrier Corporation has determined that this product meets the Energy Starr guidelines for energy efficiency. Refer to the combination ratings in the Product Data for system combinations that meet Energy Starr guidelines. S Front–seating service valves S Scroll compressor S Internal pressure relief valve S Internal thermal overload S High pressure switch S Loss of charge switch S Filter drier S Balanced refrigeration system for maximum reliability Durability WeatherArmort protection package: S Solid, durable sheet metal construction S Steel louver coil guard S Ceramic coated cabinet screws S Baked–on, complete coverage, powder paint Applications S Longline — up to 250 ft. total equivalent length, up to 200 ft. 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 Single-Phase 5 year limited parts warranty Three-Phase S 10 year limited compressor warranty 5 year limited compressor warranty 1 year limited parts warranty MODEL NUMBER NOMENCLATURE 1 N 2 2 N 5 3 A H Product Family H = RES HP 4 A C Tier 5 A/N A Major Series 6 N 3 SEER 3=13 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 5=208/230 3 6=460 3 13 N 1 Minor Series 0, 1, 2. Product Series 25 = HP Cooling Capacity C=Comfort A = Puron ISO 9001:2000 the environmentally sound refrigerant REGISTERED 25HCA3 This product has been designed and manufactured to meet Energy Star® 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.