INSTALLATION
11
4.
INSTALLATION
4.1.
Hydraulic connections
The boiler is intended for connection with a closed expansion vessel network. The boiler is
intended for maximum working temperature 90
o
C and maximum pressure 3 bar.
The expansion vessel must be connected on the return line. The discharge valve be connected
through a pipe to the drainage.
If a connection pipe is not used, it must be sealed before water fill!
4.2.
Return temperature protection
For the correct function of the boiler and for protection against corrosion it is very important to
ensure steady temperature at the return of the boiler of at least 55
o
C.
This can be ensured by installing a recirculation pump between the boiler outlet and return (see
connection diagrams).
An alternative variation is by installing at the return of the boiler a three-way thermostatic valve.
Having a return temperature less than 55
o
C is very dangerous for the boiler
long-life and can cause warranty loss!
4.3.
Filling the system
After completing all the hydraulic connections, the circuit may be filled with water. After filling
the system, open the radiators air valves to get rid of the air in the installation.
Verify that the installation pressure is according to the technical feature of the boiler. The
pressure must be verified through the boiler’s manometer. An additional manometer should be
installed on the cold water inlet to verify the cold pressure, at the lowest point of the installation,
at a point close to the boiler.
The whole installation must remain under nominal pressure for at least 10 minutes. During this
period, check that all the connections are tight and there are no water leakages. Make sure that
during this period no pressure drop appears.
After firing the boiler, make sure the network functions properly at working temperature and
pressure.
The hardness of the mains water supply affects the boiler’s life span. It is
recommended to use a water softener if water hardness exceeds 5
o
GH.
Legend
T1
Outlet
T2
Return
T3
Chimney connection
T5
Drainage valve
T7
Safety connection
