Alpha InTec2 20SE Installation And Servicing Instruction page 37

6.3 PREPARE FOR SERVICING - Fig. 6.5
1. Ensure the electrical supply is isolated and the gas supply is off.
2. Gain access by removing the control panel cover, case front panel and lowering the control panel as described in
Section 6.2.
3. Remove the condensate trap assembly as described in Section 7.11.
4. Remove the electrode as described in Section 7.3 and check its condition.
5. Remove the three screws securing the fan air/gas manifold and remove the two spring clips at either end of the gas
pipe, removing the pipe and manifold together.
6. Unscrew the flue sampling point cap and remove the complete fitting from the top of the case.
7. Disconnect the flue sensor wires and remove the lower retaining screw on the flue manifold assembly.
8. Pull down the flue manifold assembly and withdraw the complete assembly.
9. Disconnect the fan wire.
10. Unlatch the two clips 'A' in Fig. 6.5 securing the fan and burner cover and remove the complete assembly.
11. Disconnect the earth wire from the burner and lift the burner out of the heat exchanger.
6.4 CLEANING THE ELECTRODE AND BURNER
1. Check the condition of the burner, using vacuum carefully clean the side not exposed to the flame (do not use
compressed air or a brush). Do not clean the side exposed to the flame, it can easily be damaged.
2. Remove the electrode and check its condition.
If it is in good condition, remove any oxide deposits using a fine abrasive paper. Replace it in the heat exchanger using
a new gasket.
If it is necessary to replace the electrode ensure a new gasket is used and connect the lead to the PCB through the
grommet in the rear of the control panel.
6.5 CLEANING THE HEAT EXCHANGER
Cleaning the heat exchanger is only necessary if the air flow test pressure has reduced by more than 40% as
described in Section 5.4.
Gain access and drain the boiler heating circuit as described in Sections 7.1 and 7.2.
1. Remove the condensate trap assembly as described in Section 7.11.
2. Remove the electrode as described in Section 7.3 and check its condition.
3. Remove the three screws securing the fan air/gas manifold and remove the two spring clips at either end of the gas
pipe, removing the pipe and manifold together.
4. Unscrew the flue sampling point cap and remove the complete fitting from the top of the case.
5. Disconnect the flue sensor wires and remove the lower retaining screw on the flue manifold assembly.
6. Pull down the flue manifold assembly and withdraw the complete assembly.
Burner removed
Electrode
A
Fan and burner cover
Gas supply pipe
Fig. 6.5
Alpha InTec² 20SE and 30SE - Routine Servicing
Earth wire
connection
A
37