CONTROL
26
4.8.5 Photovoltaic and Smart Grid
The unit is Smart Grid Ready certified and is equipped with logic for connection to devices that balance loads
connected to the power grid and optimise overall power consumption. Connection is optional and the function can be
enabled at the keyboard and is linked to the SGON/OFF input, which receives a status signal from the mains.
The unit is also able to automatically consume the excess energy produced by a photovoltaic system, using it to store
free thermal energy in the DHW tank. The function is enabled by default, it does not require any keyboard settings and
is tied to the ON/OFF EVU input, which receives a signal from the energy meter indicating when excess free energy is
available to the unit.
The control logic of the two contacts is:
Energy cost
Contact ELECTRIC
HEATER
AVAILABLE
Operation
SG EVU System DWH
Free ON ON
-
Standard
When there is no demand for system heating/
cooling: forced domestic hot water operation
with T5S set point = 60°C
IBH
TBH Forced domestic hot water operation with
T5S set point = 70°C. TBH is forcibly started
until the domestic hot water set point is
reached.
If necessary, the Heat Pump can work
simultaneously on the Heating/Cooling
system.
IBH + TBH*
Economical OFF ON
-
Standard
The domestic hot water set point is forced to
T5S + 3°C
IBH
TBH
The domestic hot water set point is forced to
T5S + 3°C
The TBH is forced to start when T5 < T5S -
2°C and stops when T5 ≥ T5s + 3°C
IBH + TBH*
Standard OFF OFF any Standard Standard
Expensive ON OFF
-
Forced OFF Forced OFF**
IBH / TBH
* when IBH and TBH are enabled together, IBH can only be used for system heating.
** DISINFECT, FAST DHW, STORAGE TANK and other domestic hot water-related functions do not work.
The frost protection and defrosting operate smoothly in all conditions.
if AHS is available, it can operate for Heating, Cooling or DHW in any of these conditions.
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