83
EN
Cod. 3542B230 - Rev. 00 - 02/2022
OMNIA S HYBRID H 3.2
13.5 Periodic boiler maintenance
To maintain the correct operation of the appliance, a qualified technician must perform an annual check which includes the following checks:
• The control and safety devices (gas valve, flow meter, thermostats, etc.) must work correctly.
• The fume evacuation circuit must be fully efficient.
• The sealed chamber must be tight.
• The air-fume pipes and terminal must be free from obstacles and leaks
• The burner and exchanger must be clean and free from build-up. Use suitable brushes for any cleaning required. Do not use chemical products under any
circumstances.
• The electrode must be free from build-up and correctly positioned.
• The electrode must be freed from build-up using only brushes with non-metal bristles and must NOT be sanded.
• The gas and water systems must be tight.
• The water pressure of the cold system must be about 1 bar; if it is not, restore it to this value.
• The circulation pump must not be blocked.
• The expansion vessel must be loaded.
• The gas flow and pressure must correspond to the indications in the respective tables.
• The condensate evacuation system must be efficient and must not have any leaks or blockages.
• The siphon must be filled with water.
• Check the quality of the water in the system.
• Check the state of the exchanger insulation.
• Check the gas connection between the valves and the venturi tubes.
f• If necessary, replace the burner gasket because it is damaged.
• At the end of the inspection, always check the combustion parameters (see “checking the combustion values”).
13.6 Unscheduled maintenance and replacement of boiler components
After replacing the gas valve, burner, electrode and electronic board, the calibration procedure [AUTO SETUP] must be performed (see “Boiler calibration procedure
[AUTO SETUP]" on page 69). Then, follow the instructions in paragraph “11.2.5 Checking the boiler combustion values" on page 69.
13.6.1 Replacement of the boiler gas valve
CAUTION
Disconnect the electrical power supply and close the gas tap upstream of the valve
• Disconnect the electric connectors “1” ("fig. 51 -").
• Disconnect the gas supply pipe “2” ("fig. 51 -")
• Loosen the screws “3” ("fig. 52 -")
• Extract the gas valve “4” gas diaphragm “5” ("fig. 53 -").
• Install the new valve following the instructions described in reverse order.
• If the gas diaphragm needs replacing, refer to the instruction leaflet provided in the kit.
fig. 51 -
fig. 52 -
fig. 53 -
