| Raise the burner up and forward, easing the pilot pipe down, to clear, take care not to damage the combustion chamber insulation or the pilot burner assembly. Use a vacuum cleaner or suitable stiff brush to clean the burner thoroughly, making sure that all the burner ports are clear and unobstructed. Note. On refitting and after cleaning the heat exchanger make sure the main burner is fitted correctly, that is, located on the main injector and horizontal. 8.4 Main Injector With the main burner removed the main injector can be inspected and cleaned as necessary, see diagram 8.5. If removing for cleaning do not use a wire or sharp instrument on the hole. Use a little suitable sealant on the external thread when refitting to make sure a gas tight seal is made. 8.5 Pilot Burner/Electrode and Pilot Injector Clean the pilot burner and electrode. To remove the electrode release the spring clip, see diagram 8.6. When removing and replacing the pilot injector from the pilot burner take care not to damage the electrode, see diagram 8.6, clean the injector by blowing through it. Check that the spark gap is as shown in diagram 6.4. 8.6 Operational Checks After completing a service and before fitting the case, check condition of the case seal and renew if necessary. Examine flue hood and terminal to make sure they are clean and clear of obstructions. Light the boiler and carryout the functional checks as described in Section 6. |