Strebel S-CB+ Series, Installation Operating & Maintenance Manual

Page: 86 / 125

S-CB
+
Boiler Range Manual
86
11.3.7 A
NTI
-L
EGIONNAIRES
’
DISEASE FUNCTION
(
PASTEURISATION
)
This function can only be used for
an “indirect” programmed boiler (parameter
P4 AA = 1), on which a DHW pro-
gram 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 start-
ing day and time of this Legionnaires' disease function can be programmed at the control panel of the boiler.
There are several parameters being 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’ dis-
ease demand. When no interruption is activated the boiler will wait for the end of the heat demand before the anti-
Legionnaires’ disease function starts. The standard factory setting for this function is “OFF”.
The settings of these parameters
P5 CI , P5 CJ and P5 CD must be programmed according to the national and/or
local 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 Legionnaires' disease free installation remains at the end-user/owner.
P5CI = 5°C
This is the bandwith within which the Legionnaires'
temperature must stay during the programmed
duration (P5CJ). In this example the temperature
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 tem-
perature will be between the 65°C and 70°C.
P5CD = 70°C
This is the maximum temperature during
anti Legionnaires' disease function period.
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
at
er tem
pe
rat
ure