Designed to control the room temperature for VAV terminals with 1X0~10 VDC output to cooling/heating or 2X0~10 VDC outputs to cooling and heating dampers. Also one or two relay outputs to control one or two stages electric aux. heater. LCD can display working status such as room temperature, set point, analog output, etc. Makes reading and operating easy and accurate. All models feature user-friendly setting buttons Smart and enough advanced setup makes the thermostat being used in all Up to two-stage electric aux. heater control makes temperature controlling more accurate and energy-saving. Large set point adjustment, the mini. and max. limit of temperature preset by end users Low temperature protection Celsius or Fahrenheit degree selectable Cooling/heating mode auto changeover or manual switch selectable Two parts structure and quick wire terminal blocks make mounting easily. Infrared Remote Control (optional) Blue backlight (optional) Optional Modbus communication interface