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11.5 Anti-Legionella
Menus 6.5 / 6.5.1 - 6.5.3)
With the “AL function” activated the controller makes it possible to heat the
domestic hot water storage tank up at certain times to a higher temperature,
assuming that the energy that is fed allows this.
Caution
Danger
During the anti-Legionella function the storage tank is heated up
over the normal domestic hot water temperature, which can lead
to scalding and damage to the system.
Caution
This function does not provide complete protection against Le-
gionella, because the controller is dependent on suf
fi
cient energy
being fed in, and it is not possible for the controller to monitor the
temperatures in the entire range of the storage tanks and the con-
nected piping system.
To provide complete protection against Legionella bacteria, it
must be ensured that the temperature is raised to the necessary
temperature, and at the same time there must be water circulation
in the storage tank and piping system by means of other additional
energy sources and control units.
The anti-Legionella function is switched off at delivery.
When heating-up has been carried out with the anti-Legionella func-
tion switched on, an information message with the date appears
under menu item 6.5.3 . The operating times for the anti-Legionella
function must also be de
fi
ned (see 8.3)
AL function setting range: On or Off / default setting: Off
AL TRef setting range: from 60°C to 70°C / default setting: 63°C
11.3 Max. domestic hot water
Menu 6.4
This value is used to set an upper limit for the permissible domestic hot
water heating. A proper setting will prevent a high-pressure fault from oc-
curring in the heat pump, for example.
Setting range: from 45°C to 90°C / default setting: 63°C
The setting value limits the temperature for all domestic hot water
function, including the anti-Legionella function.
A temperature setting that is too high can lead to scalding and damage
to the system.
11. Protective functions
(continued)
Protective functions
Menu 6
11
11
Danger