SIEMENS RAB21 Room thermostat for 2-pipe. fan-coil, 3-st. ventilator

RAB mechanical room thermostats, 3-stage control. Room thermostats of the RAB series are designed for temperature regulation in rooms that are heated or cooled by fan-coil units. These are regulators with a two-state output that control the room temperature using a metal membrane using the thermal expansion of the gas. The required temperature is set using the wheel on the front of the device, the fan speed is selected using a three-position switch. The fan can run continuously or only when the output contact is activated.