The Jung RTR231 is an electronic room thermostat for heating and cooling with a 230 V AC power supply. It is designed for flush-mounted installation in a standard electrical device box (DIN 49073).

• Main features:
• Internal temperature sensor
• Selectable control modes (PWM or two-point)
• Manual comfort temperature adjustment
• Comfort temperature limitation
• ECO/recovery input for central timer
• Cooling mode input (and manual cooling)
• Frost protection
• Temperature drop/window open detection
• Weekly valve protection cycle
• ±3 °C offset adjustment
• Silent mode
• Multicolor status LED

It does not have a digital display; operation is carried out via a rotary switch. Designed to control electrothermal actuators (supports 1–10 actuators), maximum connection load 20 W, maximum switch current 100 mA. The temperature setting range is approximately +5 to +30 °C, with an ambient operating temperature from −5 to +45 °C.