Room Units and Controllers
Design range of communicative room units and controllers brings new dimensions in room controls. Large LCD display (60 x 60 mm) displays room temperature and status so that the data are visible up to 5 m distance. With a push/turn knob both temperature correction and operation mode change is easy, as is multi-level parameter setting inclusive weekly schedule plan.
For air handling units, small boilers, A/C units and other devices, universal room units are the best choice. They provide basic functionality (room temperature, room setpoint, operation mode setting) as well as more complex functions: heating curve selection, DHW setpoint, relative humidity and air quality display and setting, etc. The set of functions to enable is configured at the commissioning time. For example, the set of operation modes may be residential (Day, Night, Auto, Off) or hotel/office (Comfort, Standby, Party, Off). Each mode provides separate setpoints for heating and cooling. The configuration software is free of charge. Units with CO2 sensors, UI09x, are used where demand-based ventilation is required.
The universal room units are available also with one digital output for control of e.g. radiator valve, and two inputs and two outputs for e.g. presence sensor and window contact, and control of heating and cooling valves. The control algorithm is not part of the room unit and must be configured in the process station, which gives more freedom to the application engineer.
Individual room controllers, on the other hand, provide independent control functionality with PI or on/off algorithm, together with the operation mode logic. The setpoints are predefined and therefore only bus address must be set at the commissioning time, optionally with enabling or blocking other functions (valve protection, change-over, selected operation modes, time scheduler etc.)
The UC100 room controller provides one SSR PWM output to control a thermic actuator or electrical heater, UC200 features two outputs for heating and cooling, and two inputs for presence sensor (e.g. from a card reader or IR sensor) and window contact or dewpoint sensor for systems with cooling panels.
Floor heating is controlled by UC300, a communicative controller with an extra analogue input for a Pt1000 floor temperature limitation sensor.
To control fancoil units, choose FC010 with room unit UC010. The controller has three relays for a 1 to 3 stage fancoil, two PWM outputs for heating and cooling, and two inputs for presence sensor and window contact. The small controller body fits to the fancoil easily with two screws or a DIN rail holder. The controller communicates with the room unit over a RS485 bus.
The FC020 features analogue inputs, and therefore suits perfectly to plants where the communicative room unit with display is not the right choice or where a room unit can not be installed at all, such as corridors and public places. Analogue outputs for heating and cooling are also available here.
In the range there are also room controllers with Ethernet communication (UC150, UC250), room temperature and humidity sensors with Ethernet, PoE and Modbus/TCP communication, with or without LCD display, signalling units UI400 for commercial refrigeration, and other customized devices.
The controllers and room units communicate either with a process station, which reads energy demand ;signals to control primary plants and sets central depression modes, or with a SCADA station over a serial converter or Modbus RTU / IP router. For small installations, such as residential houses and family hotels, the web interface UCWEB is an easy way how to manage the rooms over the Internet, and control a boiler or a heat pump.
All room units and controller provide open communication over Modbus RTU and they are suitable not only for the Domat process stations and SCADA, but also for any open control or SCADA system. The heating controllers UB100 (with change-over function) and heating / cooling controllers UB200 communicate over BACnet MS/TP. All devices are available in five basic colours (white, grey, beige, dark grey, and pastel green).