12
FILLING THE SYSTEM
CONNECTION TO THE MAINS GAS SUPPLY
Before connecting the boiler to the mains
gas, check that it is arranged for functioning
with the available type of gas. Thoroughly
flush all the gas pipes to remove any residues
which could compromise correct operation
of the boiler.
The gas supply must be connected to the
boiler intake (Pict. 15), following all applicable
regulations. Rigid metal piping or continuous-
wall stainless-steel hose must be used and a
shut-off valve must be connected before
the boiler.
Check that the flow rate from the line from
the gas meter is sufficient to support the
simultaneous use of all equipment connected
to it.
Check that there is no significant drop in
pressure along the distribution line from the
gas meter; pipes of sufficient diameter must
therefore be used to satisfy this requirement.
Perform the filling and topping
up of the system with the boiler
completely off and all parts at
room temperature.
Always close the filling loop
cock once you have finished the
operation.
Pict. 14
Pict. 15
When all of the boiler connections have been
plumbed in, it is possible to proceed to fill the
central heating circuit. Perform the operation
slowly to help all air bleeding out of the system.
When filling, check all the internal and external
parts of the system to make sure they are perfectly
tight.
• Open the bleed valves on the radiators
• Gradually open the filling loop cock (Pict. 14),
ensuring that any automatic air bleed valves
installed on the system are working correctly.
• Close the radiator bleed valves as soon as water
starts to come out
• Check on the boiler pressure gauge that a
pressure of between 1.3 and 1.6 bar has been
reached.
• Close the filling loop and then
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