Sime Brava Slim 25 BF, Installation And Maintenance Manual

Page: 78 / 124

78
EN
MULTI ZONE system -with pump, air thermostat and exter-
nal sensor.
TA
SE
TA2 TA3
TA1
P3
RL1
SI
RL2 RL3
P2 P1
R M
Fig. 26
2.13 Refilling or emptying
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. 27
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 5
6 3
Fig. 28
NB:
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 neces-
sary 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.
2.13.2 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 in-
stallation)
– check that the filling valve (4) is closed
– connect a rubber hose to the boiler drain valve (7) and open
it
– when it has fully emptied, close the drain valve (7)
– close the automatic bleed valve (3).
4
3 7
Fig. 29