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8. Emptying the boiler
8.1. Emptying the boiler
To empty the boiler use the tap you find on the right side of the cast-iron
exchanger after opening the upper door of the boiler and the door of
room sealed.
To achieve this operation connect the tap with a flexible pipe to a drainpipe
as it is here described:
• Connect the flexible pipe to the hose adapter of the drain tap of the
boiler.
• Unscrew the nut of the drain tap.
• Open the draining valves of the radiators, starting, from the ones which
are in the upper position.
It is absolutely forbidden to empty the boiler through its safety
valve.
9. Prolonged standstill of
the system -
Frost protection
It is wise to avoid draining the entire heating system since frequently
changing the water leads to harmful scale getting deposited in the boiler
and in the heating elements.
If the heating system is not to be used during the winter, and when there
is a risk of freezing, it is advisable to mix the water in the system with
suitable antifreeze solutions intended for this specific use (e.g., propylene
glycol associated with incrustation and corrosion inhibitors).
The boiler is equipped with an “antifreeze” function that, with system
delivery temperatures under 5 °C, makes the burner operate until the
delivery reaches a temperature of 30 °C.
The frost protection function is enabled if:
• Electrical supply to the boiler is on;
• Selector (1) is not in position (0);
• There is gas;
• The system water pressure is as required;
• The boiler is not blocked.
When there is a DHW tank the Boiler also has an “antifreeze” function
for the domestic hot water. The electronic control will prevent it from
falling under 5°C.
5. Room temperature
adjustment
The system must be equipped with a room thermostat (see the relevant
regulations) to control the temperature in the rooms.
In case of temporary absence of a room thermostat, it will be possible,
during initial lighting, to control the room temperature operating on
the boiler water temperature regulation device (ref. 2 figure 1): in these
conditions the central heating pump will continuously operate.
To increase the temperature turn the knob clockwise and anticlockwise
to decrease it.
6. Turning off the boiler
To turn off the boiler correctly, follow the instructions described here
below:
PARTIAL TURN OFF
• Turn the selector switch (ref. 1 figure 1) on (0) and verify that the
voltage lamp switches off (ref. 4 figure 1): in this way you cut off the
electrical input to the boiler.
TOTAL TURN OFF
• Close the gas cock if the boiler will not operate for a long time.
7. Filling the boiler
Important:
Regularly check that the pressure displayed by the pressure
gauge of the installation (for FiN models) or by the pressure gauge of
the boiler (for Fi models) is 0.5 to 1 bar with the boiler stopped. In case
the pressure is lower than 0,5 bar, fill the system by means of the filling
tap that it must be present in the heating circuit.
We recommend you to carry out the filling operation very slowly in order
to let off the air.
Do not fill the system when the boiler is still warm.
In case pressure drops occur frequently, the boiler has to be checked by
a qualified Service Engineer.
