Legend: 1) Chimney 2) Gasket 3) Fireproof protection cap 4) Chimney diameter not greater than
200x200mm and not higher than 5-6m
5.3
Filling the system with water
Filling the system with water is to be done using the tap valve connection of the boiler.
When filling the system with water take care that no air remains in the boiler.
The filling process is done when no air is coming out through automatic air vent and pressure gauge is
showing the value between 1,5 and 2,5 bar (closed systems). Air vent is to be set at the highest point of
the (closed) central heating system. If the pressure is below 1,5 bar the filling process must be repeated.
For open systems, working pressure depends on the overall height of the system and the open expansion
vessel (1 bar for each 10 m is an estimate).
After the filling process is done, it is obligatory to close the drain tap valve, close the water supply to
the water-filling pipe and detach the water-filling pipe.
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