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3.7.2 Energy recovery
It a function to use all energy that otherwise will go lost ; in this way I get a saving and I can guarantee a
better comfort.
The function works optimizing the post circulation of the pump in the boiler.
Usually post circulation starts at the end of an heating cycle (when the room temp has reached the set value
by the user), the burner switches off, but the pump continue to run the water in the heating circuit avoiding
overheating of the boiler and exploiting all energy inside the boiler that otherwise will get lost.
In this way we avoid also continuous on/off cycles, bigger components stress and increase of room
temperature.
With the energy recovery the 3-way valve goes in sanitary and the pump continue to run (post-circulation) to
recover all heat in the primary circuit passing it to the DHW tank. Clearly all this happens when the tank
needs to be re-heated ( it has a temp < 10°C than temp set by the user) and when the primary circuit has a
temp > 5°C than Temp of the tank.
e.g.
- heating return (NTC2) : 60 °C
- DHW temp set (T set) : 50 °C
- tank temperature (NTC1) : 49°C
The pump continue to work because 60°C is over 49°C+5°C , 49°C is lower than 60°C and 49°C is lower
than 50°C+10°C
The ENERGY RECOVERY FUNCTION guarantees a reduction in off/off cycles, and a better utilization
of components reducing the operating stress, giving a 30% saving of energy for the re-heating of the
tank
NORMAL POST
CIRCULATION
ENERY RECOVERY
POST
CIRCULATION
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