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to be defined by a designer of the heating system according to the system design and local reg-
ulations. The electrical installation related to the additional boiler equipment has to be done by
a specialist and following the valid regulations.
DANGER! The heating system must be equipped with a safety valve against exceeding
the pressure in the boiler (2,5 bar). This valve should be placed on the flow connection of
the boiler, always installed in front of the boiler closing valve (or in front of the Oventrop
– scheme 1). If the safety valve is not functional, the excessive pressure will not be
eliminated and it may cause an explosion of the boiler.
Pic. 4
Safety valve against the overpressure
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