Thermal Disinfection - Bosch Greenstar FS Operating Instructions Manual

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Thermal disinfection

When using KBR..-3A appliances with DHW tank it may be necessary to disinfect the
DHW tank and DHW system after long idle periods to prevent bacterial
contamination, for example from Legionella bacteria. This step is typically not
necessary if the potable water is chlorinated or ozonated.
Thermal disinfection can also be carried out automatically and on a regular basis; see
operating instructions for the heating control included in the scope of delivery.
Thermal disinfection covers the DHW system including the taps. For solar DHW
tanks, the solar portion of the tank is not covered.
WARNING
Risk of scalding!
Hot water can result in severe scalding.
▶ Carry out thermal disinfection only outside the normal hours of use
▶ The water in the tank will take a while to cool down to the DHW temperature as a
result of heat loss. be aware that, after thermal disinfection, the DHW may be
hotter than the set temperature.
▶ If the thermal disinfection feature is activated have DHW blending valve installed.
Performing a manual disinfection of the DHW tank and system
▶ Close all DHW taps.
▶ Advise occupants of the risk of scalding if no tempering valve is installed.
▶ Set the time and DHW temperature accordingly on the heating control with DHW
program.
▶ Set any DHW recirculation pump to continuous operation.
Greenstar FS/Combi FS – 6720810589 (2021/01)
Thermal disinfection
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