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5-PLUMBING CONNECTION
FILLING THE SYSTEM
Fill the system slowly to allow air bubbles to pass through the vent holes of the heating system. For closed circuit heating systems, the
filling pressure of the system at cold and the pre-inflation pressure of the expansion tank must be the same.
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In open vessel heating systems, direct contact between circulating liquid and air is allowed. During the heating season, the user
must check the circulating water level in the expansion tank regularly. The water level in the circulation system must be kept
constant. Practical experience shows that a regular check of the water level must be made every 14 days to maintain a relatively
constant level. When necessary, the water level must be topped up when the boiler has cooled to room temperature. This is to avoid
and damage being caused to the steel body of the boiler due to thermal stress.
•
In systems with an open vessel, the water pressure in the boiler must not be less than 0.3 bar when the system is cool.
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The water used for filling the heating system must be decontaminated and not contain air.
Attention!
Do not mix heating water with incorrect concentrations of anti-freeze or anti-corrosion substances! This could
damage the gaskets and cause noise during operation.
The manufacturer denies any liability for harm caused to persons, animals or objects caused by failure to observe
these precautions.
After making all the hydraulic connections, pressure-test the seals by filling the boiler.
This must be done with care by doing the following:
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open the air vent valves of the radiators, boiler and system;
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gradually open the filling tap of the system, making sure that any automatic air vent valves in the system work correctly;
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close the vent valves of the radiators as soon as water comes out;
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use the pressure gauge inserted in the system to check that the pressure reaches a value of approximately 1 bar; for open vessel
systems, the water is topped up automatically through the vessel.
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close the filling tap of the system and then open the vent valves of the radiators again to purge any air;
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check the seal of all the connections;
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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;
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leave the system to cool, and if necessary, restore the water pressure to 1 bar.
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.
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