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6. Prolonged standstill of the
system. Frost protection
We recommend you avoid draining the whole system as water replacements engender purposeless
and harmful limestone deposits 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 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 temperature 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 blocked.
These boilers produced for natural gas can be converted to work with LPG.
Any gas change must be effected by a Qualified Service Engineer.
7. Gas change
To maintain efficient and safe operation of your boiler have it checked by a Qualified Service Engineer
at the end of every operating period.
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 Turning off the boiler on page 10).
8. Servicing instructions
