Wavin - Ceiling and Wall Radiant Systems

Safety

A safety device must be installed on heating systems that, inde-

pendently of the control unit, can also operate in the absence of

electricity to cut off the supply of hot water to system circuits,

so that the temperature around the heating elements does not

exceed 50 °C for gypsum or lime plasters or sheets, 55 °C for

screeds based on cement or calcium sulphate or 70°C for lime

or cement rendering. These values can be reduced for other

types of coatings, for example to 45 °C for asphalt support lay-

ers. In any case, the manufacturer's specifications must be fol-

lowed for all types of coatings.

Cooling systems require a dew point detection device to cut

off the supply of cold water before the formation of condensa-

tion, while the temperature around the cooling elements must

not reach the dew point.

Clearances

The system piping must be positioned more than:

- 50 mm away from adjacent structures;

- 200 mm away from chimneys and open fireplaces, open or

walled-up shafts and lift shafts.

Joints

Expansion joints must be formed in drop-ceilings, according to

the rules laid down by the ceiling material manufacturers, while

two successive expansion joints must not be more than 10 me-

tres apart.

Leak testing

Leak testing can be performed with water or compressed air.

Before installing the support layer, the circuits must be leak

tested with a pressure test.

The pressure used in the test must not be less than 4 bar and

not more than 6 bar for standard systems.

The absence of leaks and the pressure used must be specified

in a test report. Where there is risk of frost, suitable precautions

must be taken, such as the use of anti-freeze products or heat-

ing of the building. When normal operation starts, the antifreeze

should be drained and disposed of in compliance with current

regulations and the system must be rinsed at least 3 times with

clean water.

Initial heating