C-RC-0003R-design

The C-RC-0003R module is an indoor control unit designed e.g. for simple control of room temperature, displaying the temperature, relative humidity, and the heating mode in the room; the control unit is supplied in a number of interior designs, and it can be connected directly to the CIB bus. The module always displays two values, including the units and several symbols from a fixed list in the module.

The module is designed for assembly on the wall in the flush box.

The C-RC-0003R construction consists of two parts: The first part contains the user interface in various interior designs. The second part is an embedded module, which is located in the flush box and enables the connection to the CIB bus. Both parts are interconnected with a cable. The user interface includes a graphic LCD display with controlled white backlight (N.B.: displays in some design options have no backlight - e.g. UNICA) and 3 push-buttons.

The module also contains two measurement inputs. The first input is permanently connected to the internal temperature sensor and relative humidity sensor. The second input is terminated by wires on the embedded module and a stand-alone external temperature sensor can be connected to it.

The module is mounted an a standard flush box (e.g. the KU 68). The supporting part is usually fixed to the box (depending on the design), the built-in part of the module is put in the box, and the frame with the external part with the display is mounted to the supporting part.

During the installation it is recommended (if the wire outlets in the box permit) to put the built-in part as high as possible, and as far from the temperature/humidity sensor in the cover as possible. The built-in part has a certain heat loss, which to some extent affects the accuracy of measurements; it may cause an increase of the measured temperature by 0.6 °C, and humidity by about 1 %. The error in measuring temperature can be corrected directly in the module SW configuration.

It is also necessary to realize that the backlight significantly increases the temperature in the module, and the 100% intensity of the backlight may cause a temperature rise of up to a few °C (and the corresponding reduction of RH by several %). Usually it is unnecessary to use the 100% intensity of backlight; if there is a requirement to reach exact measurement values, then it is recommended to set the permanent backlight at the maximum of 5 ÷ 10 % of the value (the Light variable in the module data structure).

Fig. 1. An example of connecting the C-RC-0003R-design control module, including the external temperature sensor

Notes:

1. The external temperature sensor must be Pt1000, Ni1000, KTY81-121, NTC 12k or other NTC with the resistance up to 160 kΩ; the connection cable can be up to dozens of meters long. A typical application is for a floor sensor. The recommended cables include e.g. the SYKFY or similar cables with at least 1x2 wires with 0.5mm diameter.

2. The module is designed as a small embedded module in a flush-box (KU68); it is terminated with the CIB bus terminal block and an external temperature sensor and a connector, into which should be inserted the temperature sensor cable from the top part of the module (the actual design cover with a mounted display, push-buttons, the temperature and a RH sensor.

3. Some design variants (e.g. UNICA) have displays without a backlight – a specific design and its characteristics have to be consulted with the Teco a. s. commercial department.

Fig. 2. Internal wiring of the C-RC-0003R-design module.