Electronic room thermostat for heating and heating/cooling with display

Electronic room thermostat for 24 V or 230 V for heating or heating/cooling with display

Easy to read LCD with backlight on TRA 421

Silent-switching Triac output (24 V types)

Easy to wire up

NTC sensor

Time programme and pilot clock output integrated in TRA 421

Optimised time programme for comfort control and energy saving

Input for lowering the room temperature (TRA 410)

Input for heating/cooling changeover (TRA 421)

Input for external temperature sensor

Cooling lock function on versions for heating/cooling

Integrated “NC” and “NO” changeover

Modern design with ergonomic setpoint adjuster

Restriction of temperature setting range

Automatic frost protection facility at 5 °C and valve protection facility