Recommendations For Prevention Of Legionella Growth (Based On European Standard Cen/Tr 16355) - Ariston Wi-Fi Manual

Hybrid electric water heater (WiFi model) – OPERATING AND MAINTENANCE INSTRUCTIONS FOR THE USER
Do not climb onto chairs, stools, ladders
6 or unstable supports to clean the
appliance.
Do not attempt to clean the appliance
without first switching it off, removing the
7
plug or turning the external switch to the
OFF position.
Do not use the appliance for any purpose
8
other than normal household operation.
Do not allow children or inexperienced
9
persons to operate the appliance.
Do not use insecticides, solvents or
10 aggressive detergents to clean the
appliance.
Avoid placing
11
appliance beneath the water heater
12 Do not drink the water of condensation
6.4

Recommendations for prevention of Legionella growth (based on European standard CEN/TR 16355)

Informative
Legionella are small rod shaped bacteria which are a natural constituent of all fresh waters.
Legionaries' disease is a serious pneumonia infection caused by inhaling the bacteria Legionella pneumophilia or other
Legionella species. This bacterium is frequently found in domestic, hotel and other water systems and in water used for
air conditioning or air cooling system. Hence the main intervention against the condition is prevention, through control
of the organism in water systems.
The European standard CEN/TR 16355 gives recommendations for good practice concerning the prevention of
Legionella growth in drinking water installations but existing national regulations remain in force.
General recommendations
"Conditions for Legionella growth". The following conditions encourage Legionella growth:
water temperature between 25 °C and 50 °C. To restrict the growth of Legionella bacteria, the water temperature
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shall be in a range that the bacteria will not grow or have minimum growth, wherever possible. Otherwise, it is
necessary to disinfect a drinking water installation by means of a thermal treatment;
stagnation of the water. To avoid long periods of stagnation, the water in every part of the drinking water installation
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should be used or flushed at least weekly;
nutrients, biofilm and sediment within the installation including water heaters, etc. Sediment can support the growth
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of Legionella bacteria and it should be removed on a regular basis from e.g. storage systems, water heaters, non-
flown through expansion vessels (e.g. once a year).
Regarding to this storage water heater, if
1) the product is switched-off for a period of time [months] or
2) the water temperature is constantly maintained between 25°C and 50°C,
it is possible for Legionella bacteria to grow inside the tank. In this case, to reduce the proliferation of Legionella, the
so-called "heat sanitation cycle" must be carried out.
The storage water heater is sold with a default active anti-legionella cycle (See Sect. 7.11 for Anti-Legionella Protection),
meaning it makes it possible to carry out a "thermal sanitisation cycle" to reduce the proliferation of Legionella inside
the tank.
This cycle is suitable for use in domestic hot water production plants and complies with the recommendations for
preventing Legionnaire's Disease specified in Table 2 of the CEN/TR 16355 standard below.
any objects and/or
Personal injury caused by falling from a height or cuts
(stepladders shutting accidentally).
Electrocution due to exposure to live components.
Damage to the appliance caused by operation overload.
Damage to objects caused by improper use.
Damage to the appliance caused by improper use.
Damage to plastic or painted parts.
Damage due to possible water leakage.
Injury from positioning
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