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The T8400C1024 Standard Electronic Digital Thermostat provides single-stage, non-programmable temperature control for 24V heating-cooling systems with manual changeover from heat to cool. Very easy to read and operate Honeywell thermostat with large display and buttons. Features: -Attractive styling complements any decor -Conveniently sized 3 1/2" x 3-1/2" thermostat with optional decorator cover plates (3 7/8" x 3 7/8" and 5 3/4" x 5 3/4") -Manual changeover from heat to cool prevents unexpected system operation -Large digital display for quick, easy readability -Keys are located for easy access -No batteries required -"Fan" and "System" switches are located on the lower edge of the thermostat to prevent accidental setting changes -Digital thermostat setpoints are permanently stored in memory and retained during power failure -Power-saving models available for virtually all equipment and application needs, including gas, oil and electric forced air, condensing gas furnaces, hydronic heat, gravity and radiant floor heat systems -Fahrenheit or Celsius temperature display Product Specifications Description - Premier White 1 Heat/1 Cool Stage Electronic Thermostat with W,Y,G,R terminals for single stage gas, oil and electric heating with cooling, including 1 heat/1 cool heat pumps Application - Conventional systems Mounting - Square Changeover - Manual Color - Premier White® Stages - 1 Heat/1 Cool Power Method - Power-Stealing Terminal Designations - W, Y, G, R Switch Positions (Fan) - AUTO-ON Switch Positions (System) - OFF-HEAT-COOL Switch Type - Electronic Accuracy (F) - 1 F Accuracy (C) - 0.5 C Dimensions (in.) - 3 1/2 in. high x 3 1/2 in. wide x 1 3/16 in. deep Dimensions (mm) - 89 mm high x 89 mm wide x 55 mm deep Setting Temperature Range (F) - 40 F to 99 F Setting Temperature Range (C) - 4 C to 37 C Cycles per Hour Adj. - 1,3,4,5,6,9,12 Cool Current - 0.02A to 1.2A running; 6.0A inrush Heat Current - 0.02A to 1.2A running; 3.5A inrush Fan Current - 0.02A to 0.5A running, 2.5A inrush Sensor Element - Thermistor LEDs - none Ambient Temperature Range (F) - 30 F to 110 F Ambient Temperature Range (C) - 4 C to 43 C Operating Humidity Range (% RH) 5 to 90% RH, non-condensing