Expanding the AB-QM family with AB-QM 4.0 CO6 Flexo

Thursday, July 25, 2024

A prefabricated Hydronic Balancing and Control solution for four-pipe heating and cooling change-over systems.

Danfoss AB-QM 4.0 CO6 Flexo - Pre-fab radiant panel connection set with 18mm connections for press-fit

At Danfoss, we continually strive to innovate and provide solutions that enhance efficiency and ease in HVAC systems. Our latest product, the AB-QM 4.0 CO6 Flexo, is a testament to this commitment. This standardized prefab connection set is designed to streamline the design, installation, and servicing of hydronic HVAC systems, specifically radiant panels and chilled beams in four-pipe heating and cooling change-over systems.

For that the set is equipped with the high-accuracy AB-QM 4.0 pressure independent balancing and control valve as well the ChangeOver6 six-way ball valve. The valves are prefabricated into a compact, pressure tested, connection set with six space optimized bended 18mm pipes; four to connect to the HVAC heating and cooling, and two to connect to the radiant panel or chilled beam. All of them can be rotated for maximum installation flexibility.

You can choose from sets with 18 mm connections for press fit, or ½” internal thread as well from sets with Low Flow range between 20-200 l/h or Normal Flow range between 65-650 l/h. Depending on the demand situation, either heating or cooling is allowed into the terminal unit. During the change-over sequence crossflow is prevented.

The change-over sequence is determined by stand-alone or Building Management System (BMS) room temperature controllers. They control Danfoss actuators mounted on both valves in the connection set. For easy connection with a BMS the digital NovoCon® actuators are used. In case of stand-alone temperature controllers or BMS with analogue I/O’s, the AME 110NL(X) modular 0-10V actuators combined with the ChangeOver6 can be used.

Features and benefits

With a built-in height of only 125 mm, including actuators, the AB-QM 4.0 CO6 Flexo minimizes ceiling space requirements. Its compact size ensures it fits seamlessly into various installation scenarios without compromising on performance.

The AB-QM 4.0 CO6 Flexo ensures perfectly balanced heating and cooling design flows, even at partial loads. This results in ultimate energy efficiency, optimizing both heating and cooling processes for better performance and lower energy consumption.

The ‘click-fit’ connections can be rotated and provide maximum installation flexibility. Despite the ultimate flexibility they ensure watertight operation and reduce failure costs. These connections also allow for quick disassembly and replacement of the AB-QM 4.0 or ChangeOver6 valves, making maintenance a breeze.

At the core of the connection set is the AB-QM 4.0 high-accuracy Pressure Independent balancing Control Valve (PICV). This ensures stable and efficient control of hydronic systems, maintaining optimal comfort levels in any environment.

The system is compatible with Danfoss NovoCon® digital IoT actuators, including the NovoCon® S and NovoCon® CO6. These actuators provide precise temperature control and can seamlessly integrate with Building Management Systems (BMS) via BACnet or Modbus, offering extended HVAC system data for enhanced monitoring and control. Especially relevant for the change-over application, the NovoCon® S actuator enables remote recommissioning of the AB-QM 4.0 design flow when the system changes from heating to cooling or vice-versa for optimal efficiency and occupants’ comfort.

Why Choose AB-QM 4.0 CO6 Flexo?

  • Timesaving: The prefabricated nature of the set reduces both design and installation time, making it a cost-effective solution.
  • Reliability: Each unit is pressure tested to ensure durability and reliability in various operational conditions.
  • Versatility: Flexible, compact sized and suitable for radiant panels and chilled beams in commercial and institutional buildings with a four-pipe heating and cooling change-over system.

Technical Specifications

  • Nominal Diameter / Pressure: DN 15 / PN 16
  • Connections: 18 mm or 1/2” internal thread
  • Flow Range: Low Flow (20-200 l/h), Normal Flow (65-650 l/h)
  • Dimensions 18 mm set: 465 x 448 x 125 mm (incl. actuator)
  • Dimensions ½”set: 477 x 480 x 125 mm (incl. actuator)
  • Available Digital IoT Actuators: NovoCon® S combined with NovoCon® CO6 or NovoCon® CO6 Energy
  • Available analogue Actuators: AME 110NL(X) combined with ChangeOver6
  • Available accessories: EPP insulation caps for AB-QM 4.0 and a set with spare hairpins, washers and o-rings for ‘click-fit’ connections
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