Riello SC ACS 80 Manual page 21

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The indicated percentages are guide values that may vary to a greater or lesser extent depending on the system,
pump and pump stage.
6.2.2 Min speed
This is where the minimum speed of the pump connected to relay R1 is set. During the setting procedure, the pump runs
at the selected speed so that the flow rate can be determined.
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The indicated percentages are guide values that may vary to a greater or lesser extent depending on the system,
pump and pump stage.. 100% is the maximum possible voltage/frequency of the controller.
6.5 Relay functions for free relays
The additional functions explained in this section can be assigned to any relay which is unused in the selected hydraulic
scheme. Every additional function can only be used once.
All activated additional functions, for which any parameters can be adjusted, also appear in menu "4. Settings".
In the factory settings (basic hydraulic scheme), relay 1 is set to "always on" by default.
Relay 2 is taken for the function "circulation" in the basic scheme. Please note that the settings for circulation are only
shown in the menu if the function "circulation" is assigned to a relay.
In order to change the assignment of a relay, the previously assigned additional function must be switched off.
Pay special attention to the technical data of the relays
6.5.1 Recirculation
Set this function to unused relay. In factory settings, this function is assigned to relay 2
6.5.2 Storage heating
To heat up the storage on demand, the necessary parameters can be set here.
6.5.2.1 Storage heating
Activate or deactivate function.
6.5.2.2 Tmin storage
If the temperature measured at the corresponding storage sensor falls below this value outside of the defined heating
times, heating is activated anyways.
6.5.2.3. Tset storage
If the temperature measured at the corresponding storage sensors falls below this value during the defined heating times,
heating is activated.
6.5.2.4. Switch-off hysteresis for storage heating
The storage target temperature is calculated from Tmin or Tset storage at the given operating time plus the hysteresis set
here. If the target temperature at the corresponding storage sensor is reached, storage heating is switched off.
6.5.2.5 Heating periods = Storage heating activation times
In this menu, the operating times for the storage heating can be adjusted, where 3 periods can be set per day which can
be copied to subsequent days.
6.5.3. Storage stratification
Storage stratification switches a valve in the primary return flow depending on the temperature.
Temperature is measured in the primary circuit and optionally in the middle zone of the storage.
6.5.3.1 Storage stratification
Activates or deactivates stratification.
6.5.3.2. ΔT storage return = Temperature difference for stratification
If the temperature in the primary circuit exceeds the temperature difference set here, the valve is switched to load the
upper storage zone.
If the temperature drops below this temperature, the valve is switched off again.
When no storage sensor is connected, a temperature of 25°C is assumed.
6.5.4. AL heating
With this function, a relay switches a boiler to anti-legionella mode as needed. The relay switches on when an anti-le-
gionella heating starts. The relay switches off when the AL-heating was completed successfully or if the enable time for
the AL-heating is exceeded.
6.5.5 AL heating
Activate or disactivate the AL heating
6.5.6. Error message
The additional function error message activates the relay in certain events and switches off only when the information
alert has been read.
6.5.7. Error message
Switch error message on or off
6.5.8. Additional pump
A second pump in the primary circuit is switched on to support the primary pump. Whenever the measured flow rate
exceeds "flow rate on", and if this conditions is met throughout the period "delay", the relay is switched on.
6.5.8.1. Additional pump
Switch additional pump on or off.
6.5.8.2. Flow rate on
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