80
EN
MULTI ZONE system - with pump, air thermostat and external
sensor.
TA
SE
TZ2
TZ3
TZ1
P3
RL1
SP
RL2
RL3
P2
P1
R
M
Fig. 23
2.13 Refilling or emptying
Before carrying out the operation described below, make sure
that the main system switch is set to "OFF".
OFF
Fig. 24
2.13.1 REFILL operations
Remove the front panel:
– remove the two screws (1), pull the front panel (2) forwards
and release it from the top by lifting it.
1
2
Fig. 25
Domestic hot water circuit:
– open the isolation valves of the domestic hot water circuit (if
present)
– open one or more than one hot water valve to fill and bleed the
domestic hot water circuit
– once bleeding has been completed, close the hot water valves.
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
radiators and the circuit on the high points of the system
4
5
3
Fig. 26
NOTE:
to completely remove all air from the system, it is
recommended 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).
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.
