RCC20 room temperature controller is used for independent room temperature control of two-pipe fan coil units with electric heaters for heating and cooling. It can output switching signals to valve actuators and electric heaters, and output switching signals to three-speed fans. RCC20 can be controlled according to room or return air temperature, and has automatic cold/hot conversion, working mode switching input, optional control parameters, AC230V working voltage and other features.
This manual provides detailed information on the RCC20 room temperature controller, including its heating and cooling functions, selectable operating modes, and wiring connections. It also describes the controller's built‑in and optional temperature sensors and how to configure DIP switches for various features.
Installation guidelines cover mounting height, wiring practices, and safety precautions, while the technical data section lists electrical ratings, temperature ranges, and performance parameters. The document includes wiring diagrams and a parts list for accessories such as sensors and actuators. This manual is written in Chinese.
| Working voltage | AC230V ±10/‑15% |
|---|---|
| Frequency | 50‑60 Hz |
| Maximum power consumption | 6 VA |
| Set‑point range | 8 °C – 30 °C |
| Control accuracy at 25 °C | ±0.7 K |
| Heating conversion error | 1 K or 4 K |
| Cooling conversion error | 0.5 K or 2 K |
| Normal mode deadband | 2 K or 5 K |
| Energy‑saving heating set‑point | 16 °C |
| Energy‑saving cooling set‑point | 28 °C |
| Standby mode set‑point | 8 °C |
| Weight | 0.23 kg |
| Enclosure colour | White |
The controller automatically changes mode when the measured temperature deviates from the set‑point by half the conversion error; heating uses a 1 K or 4 K error, cooling uses 0.5 K or 2 K.
Fan speed is set by the three output contacts Q1, Q2 and Q3; each output selects a different speed level.
The controller requires an AC 230 V supply with a tolerance of ±10 % to ‑15 %.