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White-Rodgers 1F98EZ-1421 Universal Thermostat System Upgrade single stage applications to premium high-efficiency systems (staging, heat pump or heat pump with dual fuel) - using existing 4 wires. This 2-piece system includes thermostat, and equipment interface module. FEATURES: Programming Universal - installer selectable system applications - Choice of 7 day or non-programmable (installer selectable) 4 time and 4 temperature settings per program (2 setbacks) heat and cool Energy savings up to 33% Display Large, 12-square-inch touchscreen display - largest in the industry Lighted display for easier low-light viewing Optional continuous display light Larger, easy-to-read character size Clean, uncluttered touchscreen display provides easier navigation Comfort & Convenience Humidification and dehumidification control Intuitive menu-driven setup, programming and operation, with audio prompt to confirm touchscreen entries Permanent program retention during power loss Indefinite setpoint Hold or temporary temperature override Auto heat/cool changeover option - automatically switches between heating and cooling programs Heating and cooling, heating only or cooling only configuration Setpoint temperature limits UV lamp change reminder Furnace filter change reminder Humidifier pad change reminder Maintains room temperature to within +/- 1° F Room temperature display can be recalibrated up to +/- 5° F Performance Selectable Energy Management Recovery Meets California Building Code, Title 24 Fast (FA) or slow (SL) heating cycle anticipation Exclusive "Call for Service" diagnostic indicator Compressor lockout protection Humidification and Dehumidification Control Flexibility for system integrated control and/or independent humidification and dehumidification SPECIFICATIONS: Terminals - RC, RH, C, W/I, W2, Y, Y2, G, O/B, L, +, S, -, HM, HM2, DHM, DHM2 Dimensions 5.8"W x 5.5"H x 1.4"D (control) 5.9"W x 4.6"H x 1.2"D (interface) Setpoint Temperature Range: 45° to 99° F (7° to 32° C) Rated Differential: Heat 0.6° F; Cool 1.2° F Operating Ambient Temperature: 32° to 105° F (0° to 41° C) - Interface -30° to 150° F (-34° to 66° C) - Control Operating Humidity Range: 90% non-condensing maximum Shipping Temperature Range: -40° to 150° F (-40° to 65° C) Input Hardwire: 20 to 30 VAC, NEC Class II, 50/60 Hz or DC 1.5 Amps (load per terminal) 2.5 Amps maximum load (all terminals combined) Standard Systems Single Stage gas, oil, electric Single Stage heat pump Multi-Stage gas, oil, electric Multi-Stage heat pump