Component Replacement Or Periodic Cleaning; Important Notes Prior To Servicing; Cleaning The Boiler; Draining The Boiler - Baxi Luna 3 Comfort Series Installation And Servicing Instructions

13.1 - important notes prior to servicing

1 Check the flue terminal outside and ensure it is not blocked.
 Run the boiler and check the operation of its controls.
3 Ensure that all system connections and fittings are sound. Remake any joints and check the tightness of any fittings
that may be leaking.
4 It is recommended that the operation of the safety valve is checked by turning the head counter clockwise until it clicks.
The click is the valve lifting off its seat allowing water to escape from the system - check that this is actually happe-
ning.
5 Refill, vent and re-pressurise the system as necessary. (Refer to Commissioning, section 5.1).
Record details of the service in the Service History section on last page of this manual.
Warning: Before servicing the boiler, isolate the electrical supply and close the boiler gas service cock. Allow the boiler
to cool.
Always test for gas soundness after servicing any gas carrying components.
1 Remove any deposits from heat exchanger using a suitable soft brush. Do not use a brush with metallic bristles.
 Check the condition of the combustion chamber insulation panels. Any damaged panels must be replaced.
3 Check the condition of the burner injectors on the manifold, carefully clean them with a soft brush if necessary. Do not
use a brush with metallic bristles as this might damage the injectors.
4 Remove any fallen deposits from the bottom of the inner case.
5 Unscrew and replace any injector that appears damaged.
6 Clean the top of the burner with a soft brush and check that the flame ports are clear. Blockages may be removed with
a stiffer brush. Tap the burner, open end down, to remove any deposits from inside.
7 Check the condition of the electrodes.
8 Check the spark gap, positioning and height of the electrodes.
9 Check that the fan impeller is clean and free to rotate.

14. component replacement or periodic cleaning

It is the law that any service work must be carried out by a competent person.
Warning: Before replacing any boiler components, isolate the electrical supply and close the boiler gas service cock.
Allow the boiler to cool.
Always test for gas leaks after replacing any gas carrying components or disturbing any gas connections.
Check the operation of the boiler. (Refer to Boiler Operation, section 6). Ensure that all the controls are returned to their
original settings.
Isolate the electricity supply and close the boiler gas service cock (see Fig. 18-19). Allow the boiler to cool.
1 Heating circuit
Close the central heating flow and return valves (see Fig. 18-19).
Connect a suitable pipe to the drain point and route it to a suitable container. Open the drain tap.
 Hot water circuit
Close the mains water inlet valve. Open any hot tap below the level of the boiler to allow as much draining as possi-
ble.
note: Some water will remain in the components and care must be taken when removing them.
InstructIons pertaInInG to tHe Installer

13.2 - cleaning the boiler

14.1 - draining the boiler

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95.188.3 - GB