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MULTI ZONE system - with pump, air thermostat and external
sensor.
TZ1
TA
RL1
SE
M
R
P1
SP
6.13
Refilling or emptying
Before carrying out the operation described below, make sure
that the main system switch is set to "OFF".
OFF
6.13.1 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
TZ3
TZ2
RL2
RL3
P2
P3
Fig. 31
Fig. 32
1
Fig. 33
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 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).
Refit the front panel of the boiler hooking it on at the top, push-
ing it forwards and securing it with the screw (1) which was re-
moved previously.
6
3
5
Fig. 34
63
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