Thermasis HYDRA 12, Инструкция по установке и эксплуатации

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let the system cool down and if needed take the water pressure back to 1 bar (applicable
only for systems equipped with a closed tank - refer to any standards or local regulations that
allow it); for open tank systems refilling takes place automatically via the same tank.
NOTE
In systems equipped with a closed tank, where possible, the water pressure in the
heating system - when the system is cold - must be no less than 1 bar; if under this value,
act on the system filling tap. The operation must be carried out when the system is cold.
The system pressure gauge enables to monitor the pressure in the circuit.
To fill the system, the boiler is fitted with a tap (4), with a check valve, to load the heating system
manually. During this operation, any air in the system is released via the air valve located in the
upper part of the boiler.
To ensure the valve vents, it is advisable to loosen the top cap (see figure).
The filling pressure of the system WHEN COLD must be 1 bar.
Upon completion of this filling operation, always close the tap.
Air valve