Overview
The document describes the 'aria' HVAC controller by Carel, designed for ease of use and powerful functionality. It features a comprehensive display and keypad system, suitable for various HVAC applications including ceiling mount air-conditioners, roof top air handlers, and multi-zone systems.

Specifications
The aria controller includes a graphic LCD display that shows operating mode, time, Set Point, and real-time data. Some models have a back-lit display and internal humidity sensor. It supports remote communication via a serial card and can be configured using a hardware key. The controller allows programming of three Set Points: comfort, unoccupied, and night-time, with up to seven daily programs.

Applications
1. Multi-Zone VAV Systems: Aria terminals communicate with a ceiling mount air-conditioner to manage temperature and humidity across different rooms.
2. Roof Top Units: Aria controllers manage operations and communicate with a central pCO* controller for additional functions like lighting and energy management.
3. pCO* Terminal: Aria replaces the LCD pCO* board to manage basic operations via the pLAN network.

Integration and Control
The aria controller integrates into pLAN networks, supporting up to 32 controllers. It features high capacity relay control boards for managing fans, cooling/heating steps, humidifiers, and more. Installation is simplified with a two-wire cable connection.

Technical Characteristics
Display/Keypad Terminal: Operates at 0°C to 50°C with a maximum distance of 150m from the power board. It includes analog inputs for temperature and humidity sensors.
Relay Power Boards: Operate at -10°C to 60°C with digital and analog inputs for various functions. They provide relay output power of 2500VA.
Triac Power Board: Features digital and analog outputs, operating at -10°C to 60°C, and is mounted on a DIN rail.

Conclusion
The aria controller by Carel offers a versatile and user-friendly solution for HVAC management, with robust integration capabilities and flexible control options.