VARIOUS BOILER FUNCTIONS
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Chapter 7
VARIOUS BOILER FUNCTIONS
CHECKUP
This function is carried out every time current is removed and re-applied from the boiler in the “OFF“
status. The check-up checks all the devices constituting the boiler.
PUMPS ANTIFREEZE CYCLE
This function avoids the plant water freezing when the boiler is switched o . When the temperature read
by some of the boiler probes falls below a determined temperature value the circuit board will activate all
of the outputs relative to the pumps/electro-thermal controls.
Pumps/electro-thermal controls will stop when the temperature rises.
PLANT ANTIFREEZE CYCLE
If the boiler anti-freeze function is not su cient to stop the lowering of the water, the system anti-
freeze function activates, which ignites the boiler. The boiler will remain switched on until a determined
temperature level has been reached.
SAFETY AREA 1
This function activates if the water temperature inside the boiler exceeds 87°C: even if there is no request
for heat, the electro-thermal pump/control relating to area 1 is enabled.
The stopping of the electro-thermal pump/controls will happen when the temperature decreases.
It is fundamental that the installer foresees the presence of an important heating area in the home (AREA
1) in which at least one radiator is never closed.
ANTIBACTER CYCLE
This function only activates with boiler on and allows to neutralise the bacteria of Legionnaire’s disease.
This bacteria in the water reacts di erently in relation to the water temperature:
Below 20°C the Legionnaire’s disease can live but in quiescence condition (it does not multiple but it
does not die).
Between 20 and 50°C the Legionnaire’s disease multiplies, with particularly high speed between 35
and 46°C, therefore right in the temperature area of normal domestic hot water use.
Between 50 and 55°C the Legionnaire’s disease can live but in lethargy condition (it does not multiple
but it does not die).
Between 55 and 60°C the Legionnaire’s disease is eliminated in about 6 hours.
Between 60 and 66°C the Legionnaire’s disease is eliminated in about 35 minutes.
Above 66°C the Legionnaire’s disease is eliminated in about 3 minutes.
To remedy this problem, if when the boiler is switched on the temperature of the water inside the domestic
storage is lower than 65°C for a period longer than 48 hours, the domestic storage water is heated (70°C for
at least 5 minutes) even in the absence of heat request, to neutralise the bacteria.
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