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Ariston Blu Eco Evo Manual

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EN
19
Anti-legionella recommendations (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 Legio-
nella 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
shall be in a range that the bacteria will not grow or have minimum growth, wherever possible. Otherwise, it is neces-
sary 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installa-
tion should be used or ushed at least weekly;
• nutrients,biolmandsediment within the installationincludingwaterheaters,etc.Sedimentcansupport the
growth of Legionella bacteria and it should be removed on a regular basis from e.g. storage systems, water heat-
ers, non-own 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 kept constant in the range 25 - 50°C and the Legionella bacteria could grow in the tank. In
such circumstances, reduce the proliferation of the bacteria by running a “thermal sanitisation cycle”. Water heaters are
sold with software that allows a “thermal sanitisation cycle” to be run when it is activated in order to reduce the prolif-
eration of Legionella in the tank. This cycle is suitable for domestic hot water systems and complies with the guidelines
for the prevention of Legionella stipulated 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
No storage Storage
No storage upline
of the mixer
valves
Storage upline
of the mixer
valves
No storage upline
of the mixer
valves
No
circulation
of hot water
Circulation
of hot water
No
circulation
of mixed
water
Circulation
of mixed
water
No
circulation
of mixed
water
Circulation
of mixed
water
No
circulation
of mixed
water
Circulation
of mixed
water
No
circulation
of mixed
water
Circulation
of mixed
water
Ref. in
Annex C
C.1 C.2 C.3 C.4 C.5 C.6 C.7 C.8 C.9 C.10
Temperature
- ≥ 50 °C
e
in
storage
heater
a
≥ 50 °C
e
thermal
disinfec-
tion
d
thermal
disinfec-
tion
d
in
storage
heater
a
≥ 50 °C
e
thermal
disinfec-
tion
d
thermal
disinfec-
tion
d
thermal
disinfec-
tion
d
Stagnation
- ≤ 3 l
b
- ≤ 3 l
b
- ≤ 3 l
b
- ≤ 3 l
b
- ≤ 3 l
b
Sediment - -
remove
c
rem-
ove
c
- -
rem-
ove
c
remove
c
- -
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
… 19 …


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