50
Before commissioning installation water must be fed through the filling and emptying cock
until water flows out of the overflow on the open expansion vessel. In the case of a closed
system, an over pressure of 1 to 1.5 bar must be created. In any case attention has to be
paid to slowly filling the system and the exhausting air through the integrated ventilation
valve before the above mentioned static pressure is reached or before the expansion ves-
sel overflows.
The closed system is recommended if possible for corrosion safety reasons. Corrosion
damage to domestic water boilers and stove boilers in open systems and to radiators be-
cause unhindered ingress of oxygen to the hot water cannot be excluded in the long term
domestic water may be taken from the heating circuit.
No domestic water may be taken from the heating circuit. Taking domestic water is only
permitted indirectly through intermediate heat exchangers (double shelled boilers or
through flow boilers).
The safety flow and return as well as the pipes to and from the domestic water boiler may
not be less than 1" diameter. Closed systems require a safety valve with an opening pres-
sure of 2.5 bar built into the flow line.
The manufacturer does not give a guarantee on corrosion damage to stove boilers, if non-
ferrous metals are used in the hot water circulation in open systems, in cases where no
suitable corrosion protection medium in accordance with the manufacturer's recommenda-
tions.
4.3 Integrating in an existing unit
The stove with integrated heat exchanger for the heat sink is suitable for incorporating in
existing units which are constructed as closed systems.
The safety valve on the central heating boiler in the cellar cannot cover the heating stove
as well. A separate safety valve should in any case be provided near the heating stove.
It is absolutely necessary to consume, respectively to store up the energy of the added
cooker. A buffer reservoir of 50 litres per kW water output is normally sufficient for buffer-
ing.
Содержание K158
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