8
General information
1.7 WATER TREATMENT
Treating the supply water allows you to prevent
problems and maintain the functionality and
eciency of the generator over time.
e ideal pH value of the water in the central heating
system must be:
VALUE MIN MAX
PH 6,5 8
HARDNESS (°fr) 9 15
To minimise corrosion, it is essential to use a corrosion
inhibitor. In order for it to work eciently, the metal
surfaces must be clean.
ATTENTION!
Any damage caused to the boiler, due to the formation
of build-up or corrosive water, will not be covered by
the warranty.
ATTENTION!
e models only equipped with central heating are
NOT suitable for hot water production for human
consumption (M.D. 174/2004).
1.8 BOILER FROST PROTECTION
Activated by default
is protection only cuts in when the electric and gas supply are present.
If the electric or gas supply are disconnected and 11 (SM) detects a
temperature of between 2 and 5°C when the supply is restored, the
appliance responds as indicated in the table below, in pos.2.
Antifreeze products with an inhibitor for central
heating systems (specic for multimetal) can be used
to ensure ecient protection of the central heating
against freezing.
Do not use antifreeze products for car engines since
these can damage the water gaskets.
POS
ANTIFREEZE FUNCTION
Supply
11 - SR (*)
Status of antifreeze
function
Actions
Electric Gas
1 ON ON < 7°C ON Burner and Pump ON until T > 15°C
2
ON OFF < 5 ÷ 5°C OFF
INDICATION OF FAULT CODE 16
(see Par. 4.4 ERROR CODES).
Ignition inhibited.
OFF ON OFF Ignition inhibited.
OFF OFF OFF Ignition inhibited.
(*) SR sensor, see Par. 2.2
STD.006533/003
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