The controller electronics are housed in a plastic enclosure with pre-made cable glands, which also contains all the terminals. Thanks to this layout and the resulting IP 20 rating, the controller can be installed directly on a wall or in a suspended ceiling without any additional protection. An external temperature sensor is connected to the controller and can be installed up to tens of metres away from it. Thanks to robust data communication between the controller and the sensor, the cabling is resistant to interference. In principle, short parallel runs with power cables under normal load (for example lighting or socket circuits) are not a problem for the sensor cabling, although this depends on the specific installation. A typical installation places the controller close to the thermoelectric actuators of the radiators – for example above the radiator in the suspended ceiling – while the temperature sensor is mounted in the usual place by the room door at the appropriate height.
The controller has two digital outputs and two digital inputs. The digital outputs control 24 V thermoelectric actuators for the heating and cooling valves. The digital inputs are used to connect window contacts and presence information (for example from a card access system), or, for cooling, a signal that the temperature of the controlled cooling exchanger is approaching the dew point of the room. The states of the digital inputs and outputs are indicated by LEDs, which makes commissioning and diagnostics easier.
The controller can also work as an I/O module. With simple logic in the supervisory system, writing to the corresponding Modbus register switches the digital outputs on or off, regardless of their automatic function. A simplified Modbus map in Domat IDE is available for this purpose. This function can, of course, be implemented with any Modbus master.
The controller is configured for its function through the interface in Domat IDE, which provides both the Modbus map (device) and an editor for setting up the device (similar to other devices configured with ModComTool).
The controller can also be set up, somewhat less conveniently, from other devices. Settings are made by writing values to the corresponding Modbus registers, which are listed in the Modbus table (CZ).
The controller’s stand-alone function consists of heating and cooling (opening the heating and cooling valves) to the setpoint. The setpoint depends on the current mode – off, economy or comfort – set by a write from the supervisory system or by the digital inputs (for example switching off heating or cooling when a window is open). Heating and cooling are controlled by two independent PI controllers, interlocked so that the room is never heated and cooled at the same time. Mode switching and temperature settings work practically the same as in the UCxxx and FCR0xx controller series.
A detailed description of the function, electrical properties and other features is given in the datasheet.
