Brass 3 way manifold for underfloor heating

Product detailed description

Three-circuit manifolds are essential components in radiant heating and cooling systems, particularly in residential and commercial buildings with underfloor heating. They allow individual control of each circuit, ensuring balanced flow distribution and thermal comfort. Installers typically work with these units during system commissioning, verifying flow rates and ensuring leak-free connections. The integration of flow meters enables precise regulation, which is crucial for energy efficiency and system longevity.

Manifolds are often installed in mechanical rooms, utility areas, or behind wall panels to maintain a clean appearance. The compact design and modular structure make them suitable for both new constructions and retrofit projects. Proper alignment and secure mounting are necessary to prevent vibration and noise transmission, especially in multi-storey buildings.

Technical parameters

Installation and connection

The manifold features 1-inch threaded connections for the supply and return lines, using the DIN ISO EN 228-1 standard. Each branch is connected via Eurokonus fittings to PEX-AL-PEX 16 x 2 pipes. Installers should verify the alignment of the manifold body before securing it to the mounting bracket. A level surface is required to prevent stress on the connections.

• Use ALPEX 16 x 2 ALU-EK compression fittings for branch connections.
• Ensure the sealing rings (EPDM) are undamaged before assembly.
• Mount the unit in a location accessible for maintenance and inspection.
• Check all connections for leaks after installation and before system activation.
• Avoid over-tightening fittings, which can damage the sealing surfaces.
• Install the purge valve at the lowest point of the manifold for effective air and water removal.

Compatibility and accessories

This manifold is specifically designed for use with PEX-AL-PEX 16 x 2 pipes and requires ALPEX 16 x 2 ALU-EK compression fittings for secure connections. For enclosure, it is recommended to use dedicated manifold boxes to protect the unit and improve aesthetics. Additional components such as expansion tanks, circulators, and balancing tools may be needed depending on the system design. Ensure that any supplementary parts are compatible with the operating pressure and temperature limits.

Technical background for designers

The manifold operates by dividing and directing the flow of heated or cooled water through three separate circuits. The brass construction provides good corrosion resistance and thermal conductivity. The inclusion of flow meters allows for real-time monitoring and adjustment of flow rates per circuit, which is essential for maintaining even heat distribution. The EPDM seals ensure airtight and watertight connections, while the flat gasket WS 3825 supports a secure fit between components. Designers should consider the total number of circuits, flow requirements, and system pressure when selecting the appropriate manifold size and configuration.

Service and operation

Periodic checks of the manifold’s integrity and flow meter readings are recommended to ensure optimal performance. Inspect the sealing surfaces and compression fittings for signs of wear or leakage. The purge valve should be operated regularly to remove trapped air and sediment. If a flow imbalance is detected, recalibrate the flow meters or adjust the regulating valves accordingly. No specific service interval is provided, but visual inspections and functional tests should be part of routine maintenance.

Frequently asked questions

Can this manifold be used with glycol-based coolant mixtures?
Yes, it is compatible with water-based mixtures containing standard antifreeze additives.

Is the flow meter adjustable or lockable?
The flow meters are dual-regulating and include a locking feature to prevent tampering.

What type of sealing material is used for the branch connections?
EPDM rubber seals are used for the compression fittings on the branch connections.

Does the manifold require a specific mounting orientation?
It should be mounted horizontally to ensure proper function of the purge and drain valves.

Documents for download

• Hygienic certificate PZH – manifolds, manifold brackets and accessories (PDF)