High efficiency up to 19 SEER variable-speed air conditioner with Observer Communicating Control System2 THRU 5 TONS SPLIT SYSTEM208 / 230 Volt, 1-phase, 60 HzFeaturesREFRIGERATION CIRCUIT Variable speed compressor operates at 5 stages with capacity range as wide as 25 - 100% High pressure switch Suction pressure transducer Pressure equalizer valve for easy starting Compressor discharge temperature sensor Coil temperature sensor Copper tube/aluminum fin coil PERFORMANCE Up to 13.0 EER Integrated inverter control enables 5-stage operation with Observer control Observer Wall Control with version 5.0 or newer software required Also capable of 2-stage operation with 2-stage thermostat Self-configuring installation with Observer Communicating Wall Control Compact ECM fan motor driven by integrated inverter control High performance compressor sound shield standard Isolation compressor grommets Enhanced dehumidification EASY TO INSTALL AND SERVICE Text based diagnostics with Observer Communicating wall control Only 2 control wires required from communicating indoor unit to condenser External high and low refrigerant service ports Factory charged with R-410A refrigerant Adjustments for min and max staging with Observer Wall Control BUILT TO LAST High gloss, baked-on powder coat finish over galvanized steel Post-painted (black) coil fins Coated inlet grille with 3/8' (10mm) spacing for extra protection (hail guard) Corner posts for extra strength and style WARRANTY* 10 year No Hassle Replacement limited warranty 5 year parts limited warranty (including compressor and coil) - With timely registration, an additional 5 year parts limited warranty (including compressor and coil) * For residential applications only. See warranty certificate for complete details and restrictions, including warranty coverage for other applications.