Protection Of The Boiler Against Overheating - ATTACK SLX20 Instructions For Use Manual

5.4.7 PROTECTION OF THE BOILER AGAINST OVERHEATING

Every gasifying boiler has to be equipped with functional aftercooling circuit. It is possible to
order correct valve for ensuring this function, as accessory. In the figure 5 you can see correct
installation of the aftercooling circuit valve.
CAUTION! Cooling circuit against boiler overheating can not be used according to the
EN 303-5 norm for other purposes as is the boiler protection against overheating.
Valve at the inlet of cooling water to the cooling circuit of the boiler has to be permanently
opened and cooling circuit of the boiler has to be connected to functional distribution of cold
water (e.g. to distribution of cold water of the water network) of 10–15 °C temperature and op-
erating overpressure 2–6 bar, which ensures safety operation even by electricity failure.
Thermostatic valve at the inlet of aftercooling circuit, which has sensor placed at the rear part of
the boiler, protects the boiler against overheating. If the water temperature in the boiler rises
above 95 °C, valve releases water from the water network in the cooling circuit which takes away
excessive warmth. In case of boiler overheating and opening a thermostatic valve, permanent
drain of warmed water from the cooling circuit of the boiler to the waste, has to be ensured.
Functionality of the aftercooling circuit and thermostatic valve might be also checked manually,
with the manual button of the thermostatic valve.
Figure 5 The way of cooling circuit connection
CAUTION! If the circulation of cooling water through the aftercooling circuit would not
be ensured during the opening of thermostatic valve, there is a danger of boiler damage.
In this case is warranty not valid!
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