General Recommendations - CHAFFOTEAUX 470 VERT Instruction For Installation And Maintenance

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
and other species of
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
EN
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:
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;
to run abundantly at least once a week;
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 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
in
Separate hot and cold water
No
circulation
of hot water
Ref. in
Enclosure C
Temperature
Stagnation
Sediment
a Temperature 55°C all day or at least 1h a day
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
week.
e The water temperature in the circulation circuit may not fall below
- Not required
Legionella
. The bacterium is frequently to be found in the plumbing of houses, hotels and
in 25 - 50 °C. To
To
in
is in
2
Table 2 - Types of hot water system
No Storage
storage
No
circulation
Circulation
of mixed
of hot water
water
in
storage
a
heater
c
remove
minutes at
25 -
16355
Mixed hot and cold water
No storage upline of
the mixer valves
No
Circulation Circulation
circulation
of mixed of mixed
of mixed
water water
water
Thermal Thermal
d
disinfection disinfection
c
remove
for minutes at or 5 minutes at
56
Legionella pneumophilia
Storage upline No storage upline of
of the mixer valves the mixer valves
No
Circulation
circulation circulation
of mixed
of mixed of mixed
water
water water
in
Thermal
storage
Thermal
d
disinfection
a
heater d
disinfection
c c
remove remove
°C at all delivery points at least once a
bacterium
No
Circulation
of mixed
water
Thermal
d d
disinfection