Once you have completed the installation of radiant, before covering the circuits with the screed is necessary to make the leak test system for leaks.
The tightness test consists of a water resistance test, where the test pressure is equal to 2 times the operating pressure with a minimum of 6 24 bar for hours: the pressure drop should be less than 0,3 bar.
During the test, some factors such as the quality of the liquid filling plant, the temperature and expansion of the pipe can bring down the pressure beyond this value: in this case, to complete the proof it is necessary to top up the system.
When there is danger of frost, it must take appropriate measures such as the conditioning of the building or the use of de-icers.
If the normal operation of the system requires no additional freeze protection, antifreeze products should be drained and the system should be flushed with at least 3 water changes.
Keep the pressure up later maturing plant.