Periodic Check And Maintenance Procedure; Checking The Water Pressure; Checking The Expansion Vessel; Checking The Automatic Air Vent - Baxi COMBI 224 Installation And Service Manual

10 Maintenance

10.2 Periodic check and maintenance procedure

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Warning
Before performing any operation, make sure the boiler is not pow­
ered on. Once the maintenance operations are complete, reset
the original boiler operating parameters if they were changed.
Warning
Wait for the combustion chamber and pipes to cool down.
Note
The appliance must not be cleaned using abrasive, aggressive
and/or easily flammable substances (e.g. petrol or acetone).
The following checks must be performed every year in order to ensure effi­
cient boiler operation:
1. Check the appearance and seal of the gaskets in the gas circuit and
the combustion circuit;
2. Check the condition and correct position of the flame detection and
ignition electrode;
3. Check the condition of the burner and that it is correctly fastened;
4. Check for any impurities located inside the combustion chamber. To
do so, use a vacuum cleaner or the cleaning kit available as an ac­
cessory;
5. Check the pressure of the heating system;
6. Check the pressure of the expansion vessel;
7. Check that the fan is working correctly;
8. Check that the intake and exhaust pipes are not obstructed;
9. Check for any impurities inside the siphon;
10. Check the condition of the magnesium anode, if present, for boilers
equipped with a tank.

10.2.1 Checking the water pressure

In order for the boiler to operate correctly, the pressure of the water
in the heating circuit must be between 1.0 and 1.5 bar. Restore the
water pressure if necessary.

10.2.2 Checking the expansion vessel

Check the expansion vessel and replace it if necessary. Check its
precharge every year and restore the pressure to 1 bar if necessa­
ry.

10.2.3 Checking the automatic air vent

Check that the pump venting valve is working. In the event of a
leak, replace the valve.

10.2.4 Checking the burner and cleaning the heat exchanger

1. Isolate the unit from the gas & electrical supplies.
2. Remove the front panel.
3. Remove the silencer.
Note
Reposition the silencer inside the boiler before refitting the air-gas
unit.
4. Open the air/gas cover and remove all the connectors from the PCB.
5. Close the air/gas cover.
6. Completely remove the air/gas and burner/unit by unscrewing the
four M6 nuts and undoing the
3
/ " nut below the gas valve.
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