Bedienungsanleitung Ariston Andris Lux Eco (Seite 7 von 24) (Englisch)

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Anti-legionella recommendations (European standard CEN/TR 16355)

Information

Legionella is a small bacterium, of stick-like form, and is found naturally in fresh water.

Legionnaire's disease is a serious pulmonary infection caused by inhalation of the

Legionella pneumophilia

bacterium and

other species of

Legionella

. The bacterium is frequently to be found in the plumbing of houses, hotels and water used in A/C

and air cooling systems. The most effective measure against infection is to prevent the bacterium proliferating in water circuits.

European standard CEN/TR 16355 provides guidelines for preventing the proliferation of Legionella in drinking water systems,

without substituting applicable local legislation.

General recommendations

“Conditions favourable to the proliferation of Legionella”. The following conditions are favourable to the proliferation of

Legionella:

• Water temperature in the range 25 - 50 °C. To reduce the proliferation of Legionella, the water temperature be kept with

these limits to prevent them growing or reduce their growth to a minimum. If this is not possible, the drinking water

system must be sanitised thermally;

• Stagnant water. To prevent water stagnating for a long time, the drinking water system must be flushed or made to run

abundantly at least once a week;

• Nutrients, biofilms and sediment in the circuit, including boilers, etc. Sediment may promote the proliferation of Legionella

and should be regularly eliminated from water storage devices, boilers and expansion/holding tanks (for instance, once

a year).

As regards storage heater like the present, if:

1) the appliance is switched off for several months at a time or

2) the water temperature is kept constant in the range 25 - 50°C,

the Legionella bacterium may grow inside the tank. If such circumstances, to reduce the proliferation of the bacterium, one

must run a thermal sanitisation cycle.

This cycle is suited to use in domestic hot water systems and complies with the guidelines for the prevention of Legionella

given in Table 2 of standard CEN/TR 16355 (see below).

Table 2 - Types of hot water system

Separate hot and cold water

Mixed hot and cold water

storage

Storage

No storage

upline of the

mixer valves

Storage upline

of the mixer

valves

No storage

upline of the

mixer valves

circulation

of hot water

Circulation

of hot water

circulation

of mixed

water

Circulation

of mixed

water

circulation

of mixed

water

Circulation

of mixed

water

circulation

of mixed

water

Circulation

of mixed

water

circulation

of mixed

water

Circulation

of mixed

water

Ref. in

Enclosure C

Temperature

Stagnation

Sediment

C.1

C.2

≥ 50 °C

≤ 3 l

C.2

C.3

storage

heater

remove

C.2 C.4

≥ 50 °C

≤ 3 l

remove

C.4 C.5

thermal

disinfection

C.5

C.6

thermal

disinfection

≤ 3 l

C.6

C.7

storage

heater

remove

C.7

C.8

≥ 50 °C

thermal

disinfection

≤ 3 l

remove

C.6

thermal

disinfection

C.9

thermal

disinfection

C.10

≤ 3 l

a Temperature ≥ 55°C all day or at least 1h a day ≥60°C.

b Volume of water contained in the pipes between the circulation system and the most distant tap.

c Remove the sediment from the storage heater as required by local conditions, but no less frequently than once a year.

d Thermal disinfection for 20 minutes at 60°C, for 10 minutes at 65°C or 5 minutes at 70 °C at all delivery points at least once

a week.

e The water temperature in the circulation circuit may not fall below 50°C.

- Not required

This storage water heater is sold with a thermal disinfection cycle function not enabled for default; as a consequence, if, for

any reason, one of the above said “Conditions for Legionella growth” could occur; it’s hardly recommended to enable such

function rotating the knob up to maximum water temperature (>60°C).

However, the thermal disinfection cycle does not kill all Legionella bacteria in the storage tank. It follows that if the water

temperature setting is less than 55°C, the Legionella bacterium infection may reoccur.

Caution: the water temperature in the tank can cause immediate serious burns. Children, disabled persons and the aged

are particularly at risk of burns. Check the water temperature before taking a bath or shower.

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