22
INSTALLATION
2.10
System filling and emptying
GITRÈ
boilers require a filling pipe connected to the central
heating circuit return pipe.
Turn the mains power switch OFF and turn the control panel
function selector to (
0
) before filling or draining the system.
2.10.1
Water quality requirements
The heat transfer fluid (water) for the central heating circuit must
conform to the quality parameters given in the following table:
REFERENCE VALUES
pH
6-8
Electrical conductivity
less than 200 μS/cm (25°C)
Chlorine ions
less than 50 ppm
Sulphuric acid ions
less than 50 ppm
Total iron
less than 0.3 ppm
Alkalinity M
less than 50 ppm
Total hardness
less than 35°F
Sulphur ions
none
Ammonia ions
none
Silicon ions
less than 30 ppm
If the hardness of the water exceeds the value specified in the
table, it is mandatory to install a water softening system.
9
Excessive water softening (leading to a total hardness < 15°F)
can cause corrosion in metal parts (pipes and boiler com-
ponents). Keep the electrical conductivity of the water un-
der 200 μS/cm.
0
Do not top up the central heating circuit on a frequent or
continuous basis as this can damage the boiler’s heat ex-
changer. The use of automatic topping up systems should
be avoided for this reason.
2.10.2
Filling
RI
− Make sure that the central heating drain cock (1) and
storage cylinder drain cock (2) (
GITRÈ B/100
models) are
closed before you start filling the system.
− Open the non-return valve (3) (
GITRÈ B/100
models only)
to facilitate filling (the slot in the screw must be perpen-
dicular to the direction of flow = horizontal)
GITRÈ
1
GITRÈ B/100
3
2
1
