RCC30 is a room temperature controller from Siemens. It can be used for independent room temperature control for four-pipe fan coils for heating and cooling. The control methods include normal, energy-saving and anti-frost modes or off. It outputs switching signals to valve actuators and switching signals to three-speed fans. It can be controlled according to room or return air temperature. The working voltage is AC230V
The RCC30 controller regulates room temperature for four‑pipe fan coil units. It can drive heating and cooling valves, control fan speed, and switch between normal, energy‑saving, frost‑protection and standby modes. Sensors may be internal, external room sensors (QAA32) or return‑air sensors (QAH11.1).\n\nInstallation guidelines cover mounting height, wiring practices, DIP switch settings and safety precautions. The document also provides a full wiring diagram, a list of compatible accessories, and detailed technical data such as power ratings, temperature ranges and certification information.
| Power supply voltage | AC230V ±10/‑15% |
|---|---|
| Maximum power consumption | 6 VA |
| Fan speed output rating (Q1‑Q3) | AC230V, max 600 VA |
| Valve output rating (Y11, Y21) | AC230V, max 300 VA |
| Temperature setting range | 8 °C … 30 °C |
| Control accuracy at 25 °C | ±0.7 K |
| Heating mode conversion error | 1 K or 4 K |
| Cooling mode conversion error | 0.5 K or 2 K |
| Operating temperature range | -25 °C … +70 °C |
| Maximum humidity | <95 % r.h. |
| Weight | 0.23 kg |
| Enclosure colour | White (RAL9003) |
The controller uses output Y11 to open the heating valve when the room temperature falls below the setpoint by half the conversion error and the valve has been fully closed for more than one minute; it closes the valve when the temperature rises above the setpoint by the same margin. The same logic applies to the cooling valve using Y11 (or Y21) with opposite commands.
Fan speed is controlled by the three outputs Q1, Q2 and Q3. When the “control fan by temperature” function is selected, the fan speed follows the temperature setpoint and operates synchronously with the valve; otherwise it can be set manually.