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From inside (document excerpt):
25HNA6 Infinityt 16 Series Heat Pump with Puronr Refrigerant Sizes 24 to 60 2 To 5 Nominal Tons Product Data INDUSTRY LEADING FEATURES / BENEFITS Energy Efficiency S 15–16.6 SEER/11.1–12.6 EER/8.4–9.1 HSPF New Aesthetic Design S WeatherArmor Ultrat Baked on powder paint Steel louver coil guard Color matched cabinet screws Extra Quiet Operation S Silencert System II for sound as low as 70 dBA Quiet mount split post compressor grommets Quiet External Silencer muffler Exclusive Silencer Top design 8 Pole PSC ball bearing outdoor condenser fan motor Forward-swept condenser fan blade Compressor sound hood Laminated steel compressor mounting plate Quiet Shift Defrost the environmentally sound refrigerant Carrier’s heat pumps with Puron r refrigerant provide a collection of features unmatched by any other family of equipment.
The 25HNA has been designed utilizing Carrier’s Puronr 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 Reliability, Quality and Toughness S Two–Stage reciprocating compressor S Field–installed 16 cu. in. filter drier S Back–seating service valves S High pressure switch S Loss of charge switch S Internal pressure relief valve S Internal thermal overload S Long–line accessory connections S Suction Line Accumulator S Vapor fog eliminator S Ideal Defrost Controls and Diagnostics S Infinityt Control or Thermostat S Utility Interface Connection S Up to 23 point diagnostic capability Applications S Long–line — up to 250 ft. total equivalent length, see S Long Line Guide for more information Low ambient (down to 0_F) with complete Infinityt system Limited Warranty S 10–year limited warranty on compressor S 5–year limited warranty on all parts MODEL NUMBER NOMENCLATURE 1 N 2 2 N 5 3 A H Product Family H = RES HP 4 A N Tier n= infinity Series 5 A/N A Major Series A = Puron 6 N 6 SEER 6=16 SEER 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 25 = HP Cooling Capacity ISO 9001:2000 the environmentally sound refrigerant REGISTERED 25HNA6 As an Energy Star® Partner, Carrier Corporation has determined that this product meets the ENERGY STAR® guidelines for energy efficiency.