Ferroli AT 18 Manual De Instalación, Uso Y Mantenimiento página 41

2.9.1 System water filling
After carrying out the plumbing connections, it is possible to FILL the unit and system:
- open all the air vent valves of the radiators - manifolds - boiler and system;
- open the valve three-way motorized heating sanitary through lever A;
- open the water filling cock gradually, making sure the vent valves work properly;
- fill the system slowly, to allow proper and complete evacuation of the air from the vent, bringing the circuit under
pressure (for a closed vessel system from 1.1 to 1.5 bar);
- when finished, close the filling cock and the valve three-way motorized through lever A;
- make sure all vent valves have discharged the air from the system.
- to display the boiler's water circuit pressure, just press the control panel button P5 for 3 seconds.
The creation of a heating system with installation of the boiler must comply with all the applicable National,
Regional, Provincial and Local regulations in the country where the system is installed.
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LEVER A
AT 18