Technical data

Alpha 500E - Routine Servicing

Fig. 20

7.3 CLEANING THE BOILER

1. Remove any deposits from heat exchanger using a suitable soft brush. Do not use a brush with metallic bristles.

2. Check the condition of the combustion chamber insulation panels. Any damaged panels must be replaced. (Refer to

Component Replacement, section 8.23).

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.

9. Check the spark gap, positioning and height of the electrodes (see Figs. 21 and 22).

10. Check that the fan impeller is clean and free to rotate.

7.4 RE-ASSEMBLE THE BOILER

1. Replace the burner, ensuring it is located correctly onto the side panels and that the leads to the flame sensing and

ignition electrodes are connected. Connect the main burner's union nut and tighten.

2. Replace the combustion chamber front cover, ensuring the bottom is correctly located in the burner.

3. Ensure the electrode leads are connected and the seals are in position in the bottom of the inner case.

4. Test the connections for gas soundness and check the burner pressures. (Refer to Commissioning, sections 5.4 and 5.5).

5. Ensure that the room sealed chamber panel seal is intact and in position, replace the panel and secure it in position with

the screws previously removed.

6. Raise the control panel and secure in position with the screws previously removed.

7. Place the front casing in position over the boiler ensuring the bottom tags are located behind the control panel and secure

in position at the top using the screws previously removed.

8. Check the operation of the boiler. (Refer to Boiler Operation, section 6).

9. Return all controls to their original settings.

Front casing screws

Room sealed

chamber panel

screws

Control panel screws

Bottom casing panel screws

Combustion

chamber

front

cover

Ignition

electrodes