28
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. 34
6.13
Refilling or emptying
Before carrying out the operations described below, make sure
that the main system switch is set to "ON" in order for the display
to show the pressure level in the system during refilling.
Make sure that the operating mode is set to "Stand-by";
if this is not
the case, press the button
y
for at least 1 second until this mode
has been selected.
ON
Fig. 35
6.13.1 REFILL operations
The
Brava Slim 40 BFT
boilers are not equipped with a filling valve
which must be prearranged on the system return.
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. 36
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, which should be on the system return
– 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 display (4)
– close the filling valve
– check that there is no air in the system by bleeding all the
radiators and the circuit on the high points of the system
– remove the front plug (5) of the pump and use a screwdriver to
check that the impeller is not blocked
– replace the plug (5)
5
4
3
Fig. 37
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 display 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.
