62
ENGLISH
3 10 5 Filling the heating system
Once the hydraulic connections have been carried out, fill
the heating system.
This operation must be carried out with a cold system, fol-
lowing these instructions:
- open the cap on the boiler's air vent valve by two or
three turns (A);
A
Fig. 31
- open the system's air vent valves
- open the boiler's external filling valve and wait until
the pressure indicated on the hydrometer to reach a
value from 1.5 bar to 2 bar. The filling procedure must
be carried out slowly, in order to free the air bubbles
in the water and allow them to be released via the
boiler and heating system vents. For instructions on
how to eliminate the air, refer to the section "Eliminat-
ing the air from the heating circuit and boiler".
- Close the filling tap
- Close the radiators' vent valves once only water is
coming out of them.
b
Although the standard boiler does not come with an
expansion tank, one must nevertheless be installed
in order to ensure the appliance's proper functional-
ity. A dedicated kit for installing the expansion tank
on board the boiler is available as an accessory. The
dimensions of the expansion tank must be suitable
for the heating system characteristics, and the tank
capacity must meet the requisites of the current reg-
ulations (collection R).
If the pressure value approaches 3.5 bar, there is the risk
of the safety valve being triggered. In this case, it is neces-
sary to request the intervention of professionally qualified
personnel
3 10 6 Emptying the heating system
Before emptying the system, always remember to shut-off
the electrical power supply by setting the system's main
switch to its "off" position.
- Close the heating system's valves
- Manually loosen the system's drain valve ((B)) and
connect the pipe (supplied along with the boiler) to it
in order to drain the water into an external container.
B
Fig. 32
