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From inside (document excerpt):
25HBS3 BasetSeries 13 Heat Pump 1 1/2 To 5 Nominal Tons (Sizes 18 60) Product Data INDUSTRY LEADING FEATURES / BENEFITS Efficiency S 13 SEER/ 11 EER / Up to 8.6 HSPF (Nominal) S Microtube Technologyt refrigeration system S Indoor air quality accessories available Sound S Sound level as low as 74 dBA S Sound levels as low as 72 dBA with accessory sound blanket Comfort S System supports Thermidistatt or standard thermostat controls Reliability S Scroll compressor S Filter drier S Loss of charge switch S Balanced refrigeration system for maximum reliability Durability WeatherArmort protection package: S Solid, Durable sheet metal construction S Wire coil guard S Baked–on 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 60 ft.
(18.29 m) evaporator above condenser (See Longline Guide for more information.) S Low ambient (down to -20_F/-28.9_C) with accessory kit Warranty Single Phase 5 year limited parts warranty Three Phase S 5 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 B Tier B=Base 5 A/N S Major Series S = R 22 6 N 3 SEER 3=13 SEER 7 N 3 8 N 6 9 A/N A Grille Variations A = Standard G = Dense Coil Guard 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 0 Series 0= Original Series Product Series 25 = HP Cooling Capacity ISO 9001:2000 REGISTERED 25HBS3 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. STANDARD FEATURES Feature 13 SEER Scroll Compressor 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 Loss of Charge Switch