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LuxPro PSDH021W Heat Pump Thermostat FEATURES: System Powered Only Large Illuminated Digital Display Attractive Slim Design Soft Touch Buttons Default Set Temps: 65F Heat / 78F Cool Farenheit / Celsius Switchable Adjustable Temperature Stops 5 Minute Compressor Protection Easy Installation Compatible With: Most 24VAC Heat Pump Systems Single Stage and 2 Stage Heat / 1 Cool: Heat Pumps Not Compatible With: Dual Fuel Systems 3 Wire Hydronic Systems Line Voltage Systems (120 / 240 VAC) Millivolt Systems (Wall Heaters / Furnaces & Gas Fireplaces) Specifications: 3.25" (83mm) wide x 5.05" (128mm) tall x 1.10" (28mm) deep Electrical Ratings: 1-1/2 AMPS at each terminal, 24 VAC. PSDH021W: System Powered Only. Temperature Control Range: 45°F to 90°F (7° to 32°C). Accuracy: ±1°F over a range of 45°F to 90°F. Terminals - Y1, E, G, R, B/O, Y2, W2, C