Air handling units

Our Plex air handling unit series, equipped with the new generation CA-Plex automatic controller was designed to play an integral part in demand-controlled ventilation and air-conditioning systems. The main target in the development process was to use a wide range of creative engineering solutions, while preserving the excellent quality and reliable characteristics that Airvent products are known for.

Overview

As always the main focus of our design team was to create a product line that includes a variety of solutions that are valuable to our customers. One of our innovations we are really proud of is EasyLink. This is a patented assembly solution, for a simple and elegant way of connecting or disconnecting the sections of the Plex air handling units, without having to enter the modules. This is one of many solutions we believe our customers will appreciate, due to the really short installation time on site. We have also partnered with the most reliable fan and heat recovery suppliers to be sure that Plex is in compliance with present and future energy-saving regulations and quality requirements. We provide all our standard air handling units with silent fans, equipped with speed controlled EC motors.

The most important and unique characteristics of Plex air handling units:

• Airflow range from 1200 to 30000 m³/h
• Airvent designed aluminum profile framework, connected with aluminum corners.
• Aluzink coated double wall panel casing with insulation.
• Panel thickness ranging from 30 to 55 mm.
• EasyLink. A revolutionary and patented, easy-to-use module assembly system
• New generation Airvent CA-Plex automatic control with integrated smart functions and a
  touch-sensitive display
• DUAL, a special hinge-handle, which enables the inspection panels of the unit to be opened in either direction, or to be removed by opening the handles on both sides of the door
• Rotary, counterflow or coil heat recovery system with high efficiency
• Direct driven, energy efficient plug fans with variable speed regulation and low SFP value (kW/m³/s)
• Plex Selection. A calculation program for dimensioning and selecting our air handling units, which provides accurate values and detailed technical data of the whole range (ErP 2018 ready)
• We gladly assist our clients by helping them select the most suitable unit type and size by providing technical consultancy
• Fast and flexible service team for customer support

Airflow ranges

 Nominal airlflow at 0,5–2,4 m/s air velocity
 Nominal airlflow at 2–3 m/s air velocity
 Nominal airlflow at 3–4 m/s air velocity
R Rectangular cross-section
Q Square cross-section

CA-Plex automatic control

The regulation of Plex air handling units are performed with our new generation CA-Plex integrated automatic control system. To save heating and cooling energy, the temperature can be regulated with heat recovery control. The air volume is measured on the supply and extract air sides and it is easy to set. The CA-Plex controller manages the control of external units (cooling units, pumps, etc.) as well. The control system can be connected to Modbus, BACnet or LON building management systems and can be ordered optionally with a handheld or wall-mounted LCD display control terminal. Besides the local remote control, the web interface also enables to record operation data and to obtain statistics. The CA-Plex automatic control is an integrated hardware and software solution designed specifically to adapt to Airvent's demand-controlled solutions, for a comprehensive ventilation and climate management, which leads to signifcant energy savings.

Operation

CA-Plex air handling unit control has both manual and automatic operation modes. In case of manual operation mode, it operates continuously according to the selected settings. In automatic operation mode, the intermittent operation of the air handling device can be set by means of the programmable time switch clock.

Water heating/cooling coil

Cooling and heating is controlled by 0-10V valve actuator signal, with option of chiller start signal output for the cooling. Active frost-protection based on the measurements s of the contact frost-protection sensor placed onto the return side of the coil. Below 7°C return water temperature the air handling unit is stopped, the dampers will close, the heating circulation pump is in operation, the heating valve operator receives ‘full open’ command. The heating coil is always kept warm, the temperature of the returning water is controlled to 25°C even in the switched- off position of the device.

Commissioning

Plex air handling units are delivered ready to go with a plug and play design. The power cable is equipped with a power plug. When a standard compact unit is delivered, only the supply air temperature sensors need to be installed in supply air duct before startup.

Demand-controlled ventilation

Plex air handling units can automatically start from a standby state, if the enabled demand-controlled function is requesting ventilation. A total of four demand control functions are available in the software, which can be configured independently from each other. The Airvent developed WAVe function enables automatic periodic ventilation during standby state. With a connection of external motion sensors the presence function can start the ventilation, when motion is detected and preserve operation state for a set time delay. In case of optional humidity or air quality sensors are installed, humidity and air quality functions will start ventilation automatically, if the indoor air quality is not acceptable.