EXTREMA
12
EN
cod. 3540S060 - 04/2010 (Rev. 00)
Connections to the boiler are to be made in such a way as to ensure that its internal pipes and fittings are free of stress.
If a non-return valve is installed also on the DHW circuit (if provided for), it is necessary to install a safety valve between
the boiler and circuit (with non-return valve at least 3 metres from the boiler) or an expansion tank for domestic use.
Shutoff valve kit
The shutoff valves supplied (see fig. 18) must be installed between the boiler and heating system to allow the boiler to
be isolated from the system if necessary.
For installation, follow the instructions contained in the kit.
fig. 18 - Shutoff valve kit
A
Delivery cock 3/4” (Red)
B
Domestic hot water outlet connection
C
Gas cock 1/2” (yellow)
D
Cold water inlet connection - System filling
E
Removable connection for system filling
F
System return cock 3/4” - System filling
Replenishing water
It is necessary to provide for replenishing of the water lost by the sealed system. Refer to standard BS6798 for the
methods of filling and replenishing water in sealed systems. There must not be a direct connection between the central
heating system of the boiler and the water mains. For the use of water coming from the water mains and direct pres-
surisation of the system, refer to the local water management by-laws. This connection, if provided for, must be inter-
rupted after use.
The valve installed in the boiler shell is provided with a filling connector.
Reference is made to the provisions contained in the water management by-laws.
Filling system
The boiler is provided with a special filling system. To
fill the system, remove the plugs
“G”
and install the re-
movable connection tube
“E”
. Fill the system by turn-
ing both knobs
“L“
until the pressure gauge reads a
pressure of 1 ÷ 1.5 bar. Close the knobs
“L”
and re-
move the connection tube
“E”
.
fig. 19 - Filling system
B
C
D
E
F
A
G
G
L
L
E
