Alpha Boilers Benchmark HE CB33, Инструкции по установке и обслуживанию

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It is the law that any service work must be carried out by a competent person, i.e. CORGI registered personnel.
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 soundness 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.
The replacement of components in Sections 8.3 to 8.16 does not require draining of the boiler.
8.1 GENERAL ACCESS - Fig. 24
Ensure the electrical supply is isolated and the gas supply is off.
1.
If access is required behind the control panel - Release the two fixing screws (one each side) securing the control panel
and lower the panel.
2.
To gain access behind the casing -
Lift the case front panel upwards slightly and pull it forwards to remove it from the boiler
(see Fig. 24). If required, remove the side panels by removing the bottom fixing screw and lifting forwards and upwards.
3. To gain access to the combustion chamber - Remove the four screws securing the room sealed chamber panel and
remove the panel, taking care not to damage the seal.
Note:
When replacing the panel, ensure the seal is intact and that the panel has been located correctly.
4.
To gain access to the control panel components -
Remove the five screws securing the rear cover and carefully raise
the cover from the front. When replacing the cover, ensure no wires are trapped and all wiring is secured. Secure with five
screws - do not overtighten.
8.2 DRAINING THE BOILER - Refer to Figs. 2 or 13
Isolate the electricity supply and close the boiler gas service cock (see Fig. 13). Allow the boiler to cool.
1.
Heating circuit
Close the central heating flow and return valves (see Fig. 13).
Connect a suitable pipe to the drain point (see Fig. 2) and route it to a suitable container. Open the drain point.
2. Hot water circuit
Close the mains water inlet valve (see Fig. 13).
Open any hot tap below the level of the boiler to allow as much draining as possible.
Note: Some water will remain in the components and care must be taken when removing them.
8.3 IGNITION ELECTRODE LEAD - Refer to Fig. 27
1. Gain access to the combustion chamber as in Section 8.1.
2. Disconnect the lead from the electrode.
3. Disconnect the lead from the PCB, noting its position (see Fig. 27).
4. Fit the new lead ensuring it passes through the locations in the control panel and grommets in the base of the combustion
chamber.
5. Re-assemble in reverse order.
8.4 ELECTRODES - Fig. 25
Gain access to the combustion chamber as in Section 8.1.
1.
Remove the five screws securing the combustion chamber front cover and remove the cover.
2. Disconnect the leads from the electrodes. Remove the grommet in the bottom of the chamber, disconnect the flame
sensing electrode in-line connector and withdraw the lead.
3. Withdraw the main burner out of the boiler, see Section 7.2. Take care not to damage the side insulation panels.
4. Flame sensing electrode
Remove the screw securing the electrode and withdraw the electrode.
Fit the new electrode, ensuring it is positioned correctly (see Fig. 19).
Note: Fit the in-line connector to the lead by pushing it into the connector after the burner has been fitted.
5. Ignition electrodes
Remove the screw securing the electrode and withdraw the electrode.
Fit the new electrode, ensuring both are positioned correctly and the spark gap is correct (see Fig. 19).
Re-assemble
1. Replace the burner, ensuring it is located correctly.
2. Replace the combustion chamber front cover, ensuring it is correctly located.
3. Complete re-assembly as described in Routine Servicing, Section 7.4 paragraphs 4 to 9.
Alpha HE CB25/33, SY25 - Component Replacement
8 COMPONENT REPLACEMENT