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 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