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Protective functions
With the “AL function” activated the TDC 4 makes it possible to heat the storage tank up once
at certain intervals (the “AL frequency”) to a higher temperature (“AL Tsetpoint S2”), assuming
that the energy source allows this.
AL function setting range: On or Off/default setting: Off
AL Tsetpoint S2 setting range: from 60°C to 99°C/default setting: 70°C
AL frequency setting range: from 1 to 28 days/default setting: 7 days
AL Heat (not settable): Shows the last time the AL function was active
6.7. - Anti-Legionella
Caution
The anti-Legionella function is switched off at delivery.
This function is only relevant for storage tanks where sensor 2 is
installed. Whenever heating-up has been carried out with the anti-
Legionella function switched on, an information message with the date
appears on the display.
During the anti-Legionella function the storage tank is heated up over
the set value “Tmax S2, which can lead to scalding and damage to the
system.
Danger
This anti-Legionella function does not provide complete protection
against Legionella, because the controller is dependent on suf cient
energy being fed in, and it is not possible to monitor the temperatures in
the entire range of the storage tanks and the connected 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.
Caution
When the pump is started, the ow rate is measured for one minute with the ow sen-
sor. If the ow rate is below the minimum ow rate of the sensor (see 7.7. „VFS Type“),
the pump is switched off for 5 minutes to prevent damage to the pump.
If the ow rate drops below minimum during operation (i.e. not after start up), only a
warning message is displayed, but the pump is not stopped.
Pump protection - settings range: On or Off / Default: Off
6.8. - Pump protection
Caution
When the heat metering is off, the minimum ow rate is 1 l/min.
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