A wet underfloor heating system heats the space by radiating heat into space as well as through natural convection. The heating medium is warm water at around 50 degrees Celsius flowing through installed pipework. In natural convection, the layer of air closest to the floor gains heat energy and rises while the cold air above replaces it. Heat energy comes from a boiler.
To install a wet underfloor heating system, some considerations must be made:
– Installation of wet underfloor heating cannot be done beneath floor mounted units. Floor mounted units are common in bathrooms and kitchens.
-Insulation of the spaces in which wet underfloor heating is to be installed is advisable. This is because the heat energy of circulated water may not be enough if heat losses are not prevented.
-The floor height needs to be a measurement that can allow installation of pipework. This is because the floor will be raised to accommodate various elements of the system including the pipe work and floor covering.
Start the installation process by dividing the area into two, it is also important to remember that the return and flow pipework is required. Also, note that the control valve is directional and thus ensure that the flow direction you require corresponds to that of the arrow on the valve body. The procedure below can then be followed.
-Locate the best point to install the manifold. This should be on the wall at an appropriate point. The mixing manifold consists of valves, bleeders, gauges, a thermostatic head and the pump. The water from the boiler enters the manifold through the thermostatic head.
-Locate and fix the adhesive fixing rails to the floor insulation. The number of the fixing rails is dependent on the length of each loop. It is also advisable to have the fixing rails equally spaced from each other. The arrangement of rails should be such that the fixing rails and the pipework intersect at right angles.
-Connect the first end of the heated pipe to the manifold. Lay the pipework as required by fixing each pipe into the rail. This is usually with the help of insulation clips around pipe turns and between fixing rails. Finally, link the end of the loop pipe back to the manifold to complete the loop and repeat the same for all the remaining loops.
-Fix the hose pipe to the manifold taps and fill it with water. This is for the purpose of filling the pipework and is not heated. Check for leakages and functioning of all installed components and correct accordingly.
-Finally, complete your installation by connecting your system to the heating system while following the drawing instructions. This connection should be done when the system is certified to be working properly. Connect the pipe from the boiler outlet carrying heated water to flow inlet to the manifold. Start the boiler and check readings of the pressure gauge and the temperature gauge. The maximum values read from these gauges should be within the recommended range.