45
925.916.2 - GBINSTRUCTIONS PERTAINING TO THE USER
4. fIllIng the boIler
The boiler is equipped with a hydraulic differential pressure switch that will inhibit the operation of the boiler in the event
of the pump seizing or running dry.
To shut down the boiler switch off the electrical supply to the appliance.
5. turnIng off the boIler
7. gas Change
These boilers produced for natural gas can be converted to work with LPG.
Any gas change must be effected by a Qualied Service Engineer.
IMPORTANT: Regularly check that the pressure
displayed by the manometer (11 - Figure 20) is 1 to 1.5
bar, with boiler not operating. In case of overpressure,
open the boiler drain valve.
In case the pressure is lower open the boiler lling tap
(Figure 5).
We recommend you open the tap very slowly in order
to let off the air.
In case pressure drops occur frequently have the boiler
checked by a Qualied Service Engineer.
0301_1008
Boiler filling tap
Figure 5
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
specic-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 ow temperature of 30° C when the system heating ow 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.
To maintain efcient and safe operation of your boiler have it checked by a Qualied 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 ammable 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”).
8. servICIng InstruCtIons
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