RAB21

RAB 21 is a room thermostat designed to control two-pipe fan-coil units. The thermostat is equipped with a manual heating/cooling switch and a 3-stage fan speed switch. It is suitable for use in combination with zone valves, fans or with thermoelectrically driven valves.

If the room temperature drops below the set point, the output contact for heating is activated. If the room temperature exceeds the set value, the output contact for cooling is switched on. The fan speed can be controlled in two ways, either manually (one of the three speeds is set via a switch and the fan runs continuously) or automatically (the fan starts when the thermostat is switched on). For this case, it is necessary to change the position of the jumper on the thermostat PCB before commissioning. If there is a requirement for automatic switching of heating/cooling modes, this can be done externally.