48
All maintenance operations must be carried out by professionally quali
fi
ed authorised service
personnel.
The frequency of boiler maintenance must comply with current law and, nevertheless, should be
carried out once a year.
In order to guarantee the long life of the appliance and in accordance with the current gas safety
regulations, only use original spare parts
Before carrying out any type of maintenance operation, disconnect the appliance from the mains
electricity supply and close the gas valve.
7. MAINTENANCE (Authorised Service)
7.1 General Warnings
7.2 Boiler Inspection
In order to ensure that the boiler operates ef
fi
ciently and safely, it is recommended that the appliance is in-
spected by a suitably competent technician at least once a year.
The following operations should be carried out annually
■
Check the condition of the gas seals and replace where necessary.
■
Check the condition of the water seals and replace where necessary.
■
Visually inspect the condition of the combustion chamber and
fl
ame.
■
When required, check that the combustion is correctly regulated and if necessary proceed in line with sec-
tion “Commissioning the boiler”.
■
Remove and clean any oxidation from the burner.
■
Check that the seal of the room-sealed chamber is undamaged and positioned correctly.
■
Check the primary heat exchanger and clean if necessary.
■
Check the maximum and minimum modulation pressures and the modulation itself.
■
Check the condition and operation of the ignition and gas safety systems. If necessary, remove and clean
the scaling from the ignition and
fl
ame detection electrodes, paying particular attention to replace them at
the correct distance from the burner.
■
Check the heating safety systems: temperature limit safety thermostat, pressure limit safety device.
■
Check the pre-
fi
ll pressure of the expansion vessel (see expansion vessel data plate).
■
For safety reasons, periodically check the integrity and operation of the
fl
ue gas exhaust system.
■
Check that the connection to the mains electricity supply complies with that reported in the boiler’s instruc-
tion manual.
■
Check the electrical connections inside the control panel.
■
Check the D.H.W
fl
ow rate and temperature.
■
Check that the condensate drain system is working correctly, including any parts of the system outside
the boiler such as condensate collection devices along the length of the
fl
ue and/or any acid neutralising
devices.
■
Check that the condensate
fl
ows freely and that there are no exhaust fumes present within the appliance.
