Leak testing
Leak testing can be performed with water or compressed air.
Before installing the support layer, the circuits must be leak test-
ed 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.
If asphalt screeds are laid, the system must be de-pressurised
during laying (editor’s note: In other cases the system must re-
main under pressure)
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 heating of the build-
ing.
Initial heating
This must be done on cement-based screeds at least 21 days
after installation, on calcium sulphate screeds at least 7 days
after installation and on asphalt screeds at least one day after
installation.
In any case, the manufacturer's specifications must be followed
for all types of coverings.
The initial heating begins at a supply temperature ranging be-
tween 20 °C and 25 °C, which must be maintained for at least 3
days. Then, it is necessary to set the maximum design tempera-
ture, which must be maintained for at least 4 more days.
The heating start-up process must be documented.
Thermal curve of initial heating according to UNI EN 1264-4
When normal operation starts, the antifree
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hould be drained
4
45
and disposed of in compliance with current regulations and the
system must be rinsed at least 3 times wi
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www.wavin.it
Underfloor Radiant Systems - Product Guide
15
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6
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Andamento termico del riscaldamento iniziale del massetto secondo EN 1264-4
Screed initial heating thermal trend as per EN 1264-4
Days of initial heating
Giorni di riscaldamento iniziale
50
40
30
20
10
1
2
3
4
5
6
7
8
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