Mareli Systems LC 25 - Boiler Operation

10
Mareli Systems
Example scheme for installation of an anti-condensation valve. It is recommended
that the valve be at least 60 C. At the discretion of the installer, a valve with a higher
return water temperature may be installed.
3.2. Filling the boiler and the installation with water
Filling is done through the emptying connection (which is found on the return of the boiler). e lling process
is complete when no more air comes out through the automatic vent and the pressure gauge indicates a value
between 1.5 and 2.5 bar (in the case of closed systems). e vent will be located at the highest point of the central
heating system (closed). If the pressure drops below 1.5 bar, the lling process will be repeated.
In the case of open systems, the operating pressure depends on the total height of the system and the open
expansion vessel (approx. 1 bar for every 10 m).
Aer the lling process, it is mandatory to close the drain valve, cut o the water supply and detach the lling
pipe.
Installation of the heating system and initial start-up of the boiler is carried out by a specialist authorized by the
manufacturer. In the case of an incorrectly designed system, with proven deciencies, generated by the incorrect
installation of the heating system, which can lead to the defective operation of the boiler, the full responsibility
for material damage and possible new remedial costs will fall exclusively to the person responsible for installing
the heating system central and not the boiler manufacturer or the seller.
4. BOILER OPERATION
Commissioning will be carried out exclusively by a person authorized by the manufacturer.
Prior to commissioning, ensure that:
• e boiler is properly connected to the central heating system.
• e boiler is properly connected to the electrical installation (if using pellets).
• e fuses are chosen accordingly, according to the electrical diagram of the boiler and its power in kW.
• ere is no air in the central heating system and the pressure is within the permissible range.
• e appropriate duty cycle for the circulation pump is selected.