Italtherm 18 K, Инструкция

Страница: 16 / 64

Green Heating Technology
16
Boiler inactivity
The effects of the periods of inactivity can be relevant in particular situations such as in flats used only
for some months per year, most of all in cold places.
The user will have to decide to put the boiler in the SAFETY SHUT OFF state disconnecting all the sup -
plies, or to leave it on OFF mode (but electrically supplied) in order to let the Anti Frost Function work.
When there is the possibility of freezing it is convenient to chose between the advantages and the dis -
advantages of the SAFETY SHUT OFF and of the Stand By/Anti Freezing Way.
Safety shut off
f
Turn off the general switch on the Electrical Supply Line of the Boiler;
f Close the Gas Tap;
When it is expected that the temperature is going to decrease under 0°C, call a technician to do
the following:
• Fill the system, included the primary circuit of the storage unit and the relevant coil, with an
anti-freezing solution (unless the system was already filled with said solution) otherwise it must
be completely emptied. Notice that if it had been necessary to restore the pressure (because of
possible loss) in an heating system already filled with an Anti freezing solution, the concentration
of the solution could have decreased and it could not guarantee the Anti freezing Protection.
• Let the condense collector syphon be emptied unscrewing its inferior cap.
• completely empty the hot and cold sanitary water system, including the sanitary circuit and the
boiler’s DHW storage.
Remark:
the boiler is equipped with a system which protects the main components from the excep -
tional cases of mechanical lock, due to the inactivity in presence of water and scale. The anti-
locking function can’t work in Safety shut off mode, because of the lack of electrical supply.
Before re-igniting the boiler, have a technician check that the pump is not blocked due to inac -
tivity (for the technician: unscrew the plug in the centre of the cap to access the rotor shaft and
turn it with a screwdriver or other suitable tool).
Stand‑by mode with anti‑frost & anti‑locking function
When the boiler is left in
OFF
mode during a period of inactivity, it will be protected against freezing by
several functions provided in the electronic controller, which heat the parts involved when the tempera -
ture falls below factory set values.
The anti-frost heating is accomplished by turning on the burner and pump.
In addition, when the boiler is in stand-by, it periodically activates the main internal components to
avoid rare cases of blockage due to inactivity in the presence of water and lime. This can also occur
when the boiler is locked (red lamp on) provided that the system pressure is correct.
In order for these systems to be active:
• the boiler must be receiving gas and electricity;
• boiler must be left on OFF mode (OFF shown on the display);
• system pressure must be correct (1÷1.5 bar in a cold state, minimum 0.5 bar)
In case of lack of gas, the burner won’t turn on and the boiler will go in LOCK OUT state (red lamp on or
flashing). Nevertheless the pump will work, making the water circulate in the system and reducing in
this way the possibility of freezing.