90
11.3.7
ANTI
-L
EGIONNAIRES
’
DISEASE
(
PASTEURISATION
)
FUNCTION
This function can only be used for an “indirect” programmed boiler (parameter P4 AA = 1), on which a DHW program
is active.
To prevent Legionnaires
’ disease the boiler (software) provides a function for heating up the hot water storage tank
(once a week) to a higher water temperature then the normal active hot water set point. Also, the period that this
“higher” water temperature function must be active, can be programmed.
NOTICE: the standard factory setting for this Legionnaires
’ disease (pasteurisation) function is “OFF”. To activate
this Legionnaires
’ disease, function some parameters must be programmed by the manufacturer/supplier.
The starting day and starting time of this Legionnaires
’ disease function can be programmed at the control panel of
the boiler.
Several parameters are used for this function. Three of these parameters are shown in the following graph.
With parameter P2 KI the heating (CH) demand can be interrupted to provide heat for the anti-
Legionnaires’ disease
demand. When no interruption is activated the boiler will wait for the end of the heat demand before the anti-legion-
naire’s disease function starts. The standard factory setting for this function is “OFF”.
Curve and values only for illustration purposes, programmed parameter values can deviate!
The settings of these parameters P5 CI, P5 CJ and P5 CD must be programmed according to all applicable anti
Legionnaires
’ disease preventing regulations.
The setting of these parameters can only be done by the manufacturer/supplier of the boiler or by a technician with
access to programming level 2, at the control panel of the unit without the use of a computer.
NOTICE: The use and activation of this function won’t guarantee a Legionnaires’ disease-free installation.
The responsibility for a legionnaire’s disease-free installation remains at the end-user/owner.
P5CI = 5°C
This is the bandwith within which the Legion-
naires' temperature must remain during the pro-
grammed duration. In this example the temper-
ature is allowed to fluctuate between 65°C and
70°C during the anti Legionnaires' function.
P5CJ = 80 min.
This is the duration within which the water
temperature must be between the 65°C and
70°C.
P5CD = 70°C
This is the maximum temperature during
anti Legionnaires' disease function pe-
riod.
Normal setting
water temperature.
Start of the anti Legionnaires'
disease program (start day and
time can be programmed).
Normal setting
water temperature.
Time (10 min steps)
W
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te
r t
e
m
p
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tu
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