27
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. 27
- open the system's air vent valves
- open the boiler's external filling valve and wait until
the pressure indicated on the hydrometer reaches a
value between 1 bar and 1.5 bar. The filling proce-
dure 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 instruc-
tions on how to eliminate the air, refer to the section "
Eliminating 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 bar, there is a risk that
the safety valve will be 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. 28
