49
Heating circuit:
– open the isolation and air bleeding valves in the highest points
of the system
– loosen the automatic bleed valve (3)
– open the isolation valves of the heating circuit (if present)
– Open the filling valve (4)
– Fill until the water overflows from the air bleeding valves and
shut off the valves again
– continue filling until the pressure reaches
1-1.2
bar as shown
on the pressure gauge (5)
– Close the filling valve (4)
– check that there is no air in the system by bleeding all the radi-
ators and the circuit on the high points of the system
3
4
5
Fig. 58
NOTE:
to completely remove all air from the system, it is recom-
mended that this operation is repeated a number of times.
– check the pressure on the pressure gauge (5) and if necessary
top up until the correct pressure reading appears
– close the automatic bleed valve (3)
– fill the siphon disconnecting it from the pipe or using (by means
of) the smoke take-off point.
Refit the front panel of the boiler hooking it on at the top, pushing
it forwards and securing it with the screw (1) which was removed
previously.
6.16.2 EMPTYING operations
Domestic hot water circuit:
– close the domestic hot water circuit isolation valve (prear-
ranged in installation)
– open one or more than one hot water valve to fill and bleed the
domestic hot water circuit.
Boiler:
– loosen the automatic bleed valve (3)
– close the heating circuit isolation valves (prearranged in instal-
lation)
– check that the filling valve (4) is shut-off
– connect a rubber hose to the boiler drain valve (6) and open it
– when it has fully emptied, close the drain valve (6)
– close the automatic bleed valve (3).
3
4
6
Fig. 59
