Timeguard TRT030DN Digital Electronic Room Thermostat The Timeguard TRT030DN Electronic room thermostat with digital temperature display, providing automatic temperature control for all central heating applications. Simple to install surface mount design, with electronic accuracy to improve system efficiency and help reduce running costs. Features Easily adjustable dial. Digital room temperature display, illuminated on the setting. Output LED (illuminated on call for heat). 5°C to 30°C set temperature range. Temperature swing adjustment (using DIP switches) between 0.5°C and 1°C.