Electronic thermostat TRA4 series

NTCroomfor heating and cooling

How energy efficiency is improved Individual, optimised energy use through precise adherence to setpoints Features 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