5-PLUMBING CONNECTION
30
• 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 side 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 WITH SIDE CAP
LOOSENED BY 1 TURN
