Danfoss’ new FHF-F manifold system incorporates additional features that introduce a far higher level of functionality than most previous solutions.
The Danfoss FHF-F is used for controlling water flow in underfloor heating systems. Each pipe in the floor heated system is connected to the manifold, making it possible to individually control water flow or heat supply to each room in the building.
The FHF-F, in common with its now obsolete CDF predecessor, employs established and well-proven Danfoss valve inserts to regulate the flow to each circuit, thus assuring continued high performance and dependability. After this, the specification broadens to include a number of innovations.
Each FHF-F unit, size 1”, comprises a supply and a return manifold with connections for a minimum of 2 or up to as many as 12 heating circuits. The supply manifold allows for any of the circuits to be completely shut off and includes an individual flow meter (sight-glass type) for each. This makes it easy to balance the total underfloor system by providing an instantly visible reading of the water flow in each circuit at any given time.
The return manifold is equipped with Danfoss integrated valves with a simple, effective pre-setting facility, allowing optimal hydraulic balancing and easy commissioning of the underfloor system. Pre-setting can be carried out quickly without the need for any tools. Once the thermal actuator is mounted, presetting is automatically protected and can only be altered by removing the actuator.
Each heating circuit is controlled by Danfoss TWA thermal actuators. These are available in Normally Closed (NC) or Normally Open (NO) modes and as either 24V or 230V units.
Connections between the manifold and the underfloor heating pipework are made readily by using standard Danfoss ¾” internal threaded compression fittings for PEX, AluPEX or copper pipes.
Ball valves are available as an option for providing positive shut-off between the manifold and the system. Manifold end pieces are supplied with manual air vents; automatic air vents are available as an option.
A full range of accessories, parts and spares for the FHF-F is available including mounting brackets, end sections with drain taps, automatic air vents, ball valves, thermometers and reduction pieces. All FHF-F products plus supplies of sales literature are available with immediate effect.
Technical parameters for the FHF-F are:
• Maximum differential pressure: 0.6 bar
• Maximum working pressure: Manifold with flow meter – 6 bar
• Maximum test pressure: Manifold with flow meter – 10 bar
• Maximum flow temperature: 90°C
About Danfoss Randall
Danfoss Randall LTD is firmly established as one of the leading suppliers of domestic and commercial heating controls. Its wide product range, covering the majority of system requirements, makes Danfoss Randall the obvious choice when it comes to specifying domestic or commercial heating controls.
Established in 1991 following the acquisition of the long established Randall Electronics and the subsequent merger with the Heating Division of Danfoss Ltd, Danfoss Randall brings to the market unsurpassed experience in the areas of traditional electromechanical controls, advanced electronic controls, radiator thermostats and other self-acting controls. In fact, the company can justifiably claim to have been responsible for the invention and commercialisation of both electro-mechanical time controls and radiator thermostats; so the pedigree is sound.