Alpha InTec2 26CE Installation And Servicing Instructions page 42

7.13 DHW FLOW REGULATOR VALVE - Fig. 7.3
Gain access behind the front casing as described in Section 7.1.
1. Isolate the mains water supply and open all hot taps to drain any water from the boiler.
2. Disconnect the wires from the flow regulator motor and the plug which connects the inlet sensor and the flow meter.
3. Undo the union nut and remove the fixing screw from the bottom of the regulator valve.
4. Remove the two 4 mm cap head screws securing the top and lift out the regulator valve assembly.
5. Disconnect the wires from the inlet sensor and flow meter.
6. Remove the inlet sensor withdrawing the retaining clip and fit it into a new flow regulator valve.
7. Re-assemble a new flow regulator valve in reverse order.
Cold mains inlet sensor
Condensate trap
DHW temperature sensor
Gas valve
PCB cover
7.14 PRIMARY HEAT EXCHANGER - Fig. 7.1
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.
7. Disconnect the primary sensor and fan wires.
8. Unlatch the two clips 'A' in Fig. 6.5 securing the fan and burner cover and remove the complete assembly.
9. Disconnect the earth wire from the burner and lift the burner out of the heat exchanger.
10. Remove the retaining clips from the flow and return pipes at the heat exchanger and water manifold and remove the pipes.
11. Remove the two screws securing the bottom rear of the heat exchanger sump to the boiler casing.
12. Lift the heat exchanger up and forwards to release it from its fixing bracket and withdraw it from the boiler.
13. Transfer the condensate tray, the electrode previously removed, sensors, retaining latches ('A' in Fig. 6.5) to the new heat
exchanger using new seals
14. Reassemble in reverse order.
Note: The following items must be replaced with new ones:
• Burner seal
• Condensate tray seal
• Heating flow and return pipes 'O' rings
• Electrode gasket
Check the condition of all other seals before reassembling.
15. Check again the air flow through the heat exchanger as described in Section 5.4, recording the new pressure value and
complete the service record at the back of these instructions,
42
Alpha InTec² 25XE and 28XE - Component Replacement
Fig. 7.3
DHW flow regulator
Pump head
Retaining clip
Diverter valve motor
and assembly