36
Z
1
2
10-HYDRAULIC CONNECTION
• after starting up the boiler for the first time and bringing the system up to temperature, stop the pumps and repeat the air purging
procedure;
• let the system cool down and, if necessary, bring the water pressure back to 1 bar (this only applies to closed vessel systems - refer to
any existing local regulations or standards allowing for its installation); for open vessel systems, the water is topped up automatically
through the vessel itself;
NOTE
In systems with a closed vessel, where possible, the water pressure in the heating system must not be lower than 1
bar when the system is at room temperature; if this is not the case, use the tap to fill the system. This operation must
be performed when the system is cool.
The pressure gauge on the system enables you to read the pressure in the circuit.
During this operation, any air in the system is released from the automatic vent valve located at the top of the body of the boiler.
The valve is underneath the front panel, so the operations to be performed are:
• Lift the tank cover (1)
• remove the front panel 2 (see specific page)
To ensure the valve vents, loosen the side cap (see figure)
The filling pressure of the system
WHEN COLD
must be 1 bar.
Upon completion of this operation,
always
close the filling tap.
RELIEF VALVE “Z”
