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4. Filling the systeM
IMPORTANT: Regularly check that the pressure displayed by the pressure gauge is 1 ÷ 4 bar when the central
heating system is cold. Open the boiler drain cock to reduce pressure if it is too high. Open the filling cock to
increase pressure if it is too low.
Always open the filling cock very slowly to allow any air to bleed off.
If the pressure in the system drops frequently, contact an authorised service centre to have the system chec-
ked.
5. switching the boiler oFF
To shut down the boiler switch off the electrical supply to the appliance.
6. prolonged standstill oF the systeM. Frost protection
We recommend you avoid draining the whole system as raw water makeup will lead to harmful limestone de-
posits inside the boiler and on the heating elements.
In case the boiler is not operated during wintertime and is therefore exposed to danger of frost we suggest you
add some specific-purpose anti-freeze to the water contained in the system (e.g.: propylene glycole coupled
with corrosion and scaling inhibitors).
The electronic management of the boilers includes a "frost protection" function in the central heating system
which operates the burner to reach a heating flow temperature of 30° C when the system heating flow tempe-
rature drops below 5°C.
The frost protection function is enabled if:
* electrical supply to the boiler is on;
* the gas service cock is open;
* the system pressure is as required;
* the boiler is not isolated.
7. servicing instructions and gas change
To maintain efficient and safe operation of your boiler have it checked by a Qualified Service Engineer at the
end of every heating season.
Careful servicing will ensure economical operation of the system.
Do not clean the outer casing of the appliance with abrasive, aggressive and/or easily flammable cleaners
(i.e.: gasoline, alcohol, and so on). Always isolate the electrical supply to the appliance before cleaning it (see
section 5 Turning off the boiler).
These boilers are produced for natural gas and can be converted to work with LPG (G 31).
Any gas change must be effected by a Qualified Service Engineer.
InstructIons pertaInInG to the user
912.823.1 - GB
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