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MULTI ZONE system - with pump, air thermostat and external
sensor.
TZ1
TA
RL1
SE
M
R
SP
2.13
Refilling or emptying
Before carrying out the operation described below, make sure
that the main system switch is set to "OFF".
OFF
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.
2
44
TZ3
TZ2
RL2
RL3
P1
P2
P3
Fig. 22
Fig. 23
1
Fig. 24
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) and fill the heating system until a
pressure of 1-1.2 bar is 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
– remove the front plug (6) of the pump and use a screwdriver to
check that the impeller is not blocked
– replace the plug (6)
4
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.
EN
IT
6
3
5
Fig. 25
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