Protective Functions - Riello SC ACS 80 Manual

4.4.3 Circ. hysteresis = Switch-off hysteresis of the circulation pump
If the temperature exceeds TminS2 by this value, the circulation pump is switched off.
4.4.4 Circ. maximum Flow rate = Maximum flow rate of the circulation pump
If the flow rate measured at sensor 6 exceeds this value (because water is being drained from the system) the circulation
pump is switched off.
4.4.5 Circulation period = Period where the circulation pump is enabled.
TSet the operation times of the circulation pump. 3 different periods can be set for every weekday, which can also be
copied to other days.
b
This settings are only available if circulation mode "Periods" or "Request + Time" is choosed.
b
In periods not defi ned circulation is inactive. The set periods are only used in the circulation mode "Periods and
"Request + Time"".
4.4.6 Tap support
To ensure a constant temperature even with small amount of tap water, the circulation pump can be used as support
pump. Not only does the circulation pump switch on under normal conditions, but also when a small tapping occurs.
When a storage sensor is connected, tap support is only switched on when the Min storage Temp is reached at the stor-
age sensor.
4.4.7 Minimum storage temperature
Tap support is deactivated when the storage temperature drops below „Min storage temp".
4.4.8 Tap support calibration
See "F3. - Calibration".
4.11 Comfort
If this function is activated, the heat exchanger will rinse for 5 seconds every 15 minutes, so that hot water is available as
soon as possible.

5. PROTECTIVE FUNCTIONS

Menu "5. - Protective functions" can be used to set and
activate a number of protective functions.
To quit the menu, press "esc" or select "Exit Protective
functions".
b
This does not under any circumstances replace the
safety facilities to be provided by the customer!
5.1 Anti-legionella
With the AL-function activated, the LFWC makes it pos-
sible to heat the storage in selectable intervals, (AL interval) for the set residence time (AL resid. time), starting at the
set time (AL start time) until the temperature AL Tset is reached. The temperature measured at S5 has a reference of AL
Tset +5 °C. For the time the AL function is active, Tmax is set to AL Tset +10° to prevent system shutdown due to high
temperature.
Only when a temperature of at least „AL Tset"-5 °C is reached at the Hot water sensor and, if present, at the circulation
sensor for the time set in „Al resid. time", the AL function is regarded as successful. This is displayed as "Last AL heat.".
If AL is unsuccessful after 2 hours, the attempt is cancelled and will be started again the next day and an error message
is displayed.
b
During the Anti-legionella function the storage cylinder is heated to high temperatures that can lead to scalding and
damage to the system.
b
The user must make sure that the Anti-legionella function terminates successfully at the set periods.
b
The AL function is switched off by default. A message containing the date is shown as soon as the AL function ter-
minates successfully. The AL start time should be set during a period in which little hot water is drawn off.
b
The user must make sure that the temperature of the storage cylinder is at AL Tset +5° when starting the AL cycle
manually. If sensor S3 is installed, the AL function will not start until a temperature of AL Tset +5° is reached.
b
The AL function does not provide total protection against legionella because is not possible to monitor temperatures
throughout the storage cylinder and in all connecting pipes.
5.2 Limescale protection
To prevent the accumulation of limescale, the circulation pump can continue to rinse the heat exchanger after a tapping
for at least 5 seconds or for longest 30 seconds or till the VFS sensor drops below Tset.
5.Exit protective functions
5.1.Anti-legionella
5.2.Limescale protection
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