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Logic for central heating:
Pump P1 functions if the temperature of the water in the boiler exceeds the thermostat value Th20 (55°)
and the temperature does not exceed the value of Sanitary water Th20 (70°) and the difference between
the temperature read by the Probe S1 and Probe S3 is superior to the one of the thermostat Th57). The
pump is active even if the water temperature in the boiler exceeds the value of thermostat th19. To avoid
freezing of the water the pumps starts when the water temperature goes under the value of Th18 (5°). If
the water temperature exceeds th21 value (80°), for safety reasons, the pump remains active.
Logic for production of Sanitary Hot Water:
Hot water is predominant with respect to the heating. The valve is turned on the hot water boiler if the
temperature of the water do not exceed the value of the thermostat ACS Th79 (70°) and the temperature
does not exceed thermostat Th20 (55°). For safety reasons if the temperature of the boiler is higher than
Th21 the valve turns towards the plant
Warning : By setting Summer mode (only hot water for sanitary use), when the temperature reaches 70°
(Puffer thermostat) the boilers goes to Stand-by position. When the temperatures goes under 63°C (Puffer
temperature 79 8°) the boiler interrupts the stand-by position and starts.
Configuration 4 – P26=4 – Puffer technical storage
In order to heat an accumulation puffer, it is necessary to:
Enter Menu System – Settings, set Technical parameter P26 to 4
Set on Puffer Thermostat on the User’s Menu – Heating control – the desired temperature for the water
inside the Puffer (Default setting 65°)
Connect the claps 35 and 36 from mother board (IN3) an optional probe (NTC of 10K @ 25°) and
insert it in the Puffer tank in order to allow to the central unit to detect the temperature inside
the boiler
Enter the System Menu – Settings and set technical Parameter P75 to 9.
If possible to connect the second pump P2 to exit A2 of the electric motherboard, precisely to claps
16 and 18.
Logic for plant heating:
If the temperature in the boiler S1 is Higher than the pump activating thermostat equal to 50° the system
heats the water of the puffer if there’s difference between S1 and S2 of more than 5° (Th57) in order that
the boiler do not risk to get the water of the puffer warm. For safety reasons if the temperature of the water
in the boiler (S1) exceeds the temperature of 80° the circulator gets into function. Circulator P2 starts when
the Puffer exceeds 50° (Th59).