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7.13 PRIMARY TEMPERATURE SENSORS - Fig. 6.6
Gain access to the boiler as described in Sections 7.1.
1. Unplug the wiring and unclip the sensor from the flow or return pipe as required. Re-assemble in reverse order with a
new sensor onto the conductive paste ensuring good contact between the pipe and sensor.
7.14 AUTOMATIC AIR VENT - Fig. 6.6
Gain access and drain the boiler heating circuit as described in Sections 7.1 and 7.2.
1. Turn the automatic air vent anticlockwise and lift it out.
2. Insert the new air vent and turn it clockwise to lock it in position.
3. Refill and pressurise the system. (Refer to Commissioning, Section 5.1).
7.15 PUMP HEAD - Fig. 6.6
Gain access and drain the boiler heating circuit as described in Sections 7.1 and 7.2.
1. Disconnect the two wiring connectors from the pump.
2. Using a 4 mm Allen key remove the four socket head screws securing the pump head to the body.
3. Reassemble the new pump head in reverse order, re-connecting the two wiring connectors.
4. Refill and pressurise the system. (Refer to Commissioning, Section 5.1).
7.16 PRIMARY PRESSURE SWITCH - Fig. 6.6
Gain access and drain the boiler heating circuit as described in Sections 7.1 and 7.2.
1. Disconnect the wiring from the pressure switch.
2. Withdraw the retaining clip on the left side of the switch and lift the switch upwards to remove.
Note: This is a direct component, ensure all electrical components are protected from water escape.
3. Insert a new switch and re-assemble in reverse order.
Note: When connecting the wiring to the new switch the polarity of the wires is not important.
7.17 SAFETY VALVE - Fig. 6.6
Gain access and drain the boiler heating circuit as described in Sections 7.1 and 7.2.
1. Disconnect the clear plastic tube from the pressure relief valve.
2. Remove the retaining clip securing the expansion relief valve and pull the valve forwards to remove.
3. Re-assemble in reverse order.
4. Refill and pressurise the system. (Refer to Commissioning, Section 5.1).
7.18 EXPANSION VESSEL - Fig. 6.6
Note: Check that the pressure of the new vessel is 1 bar before it is installed.
Gain access and drain the boiler heating circuit as described in Sections 7.1 and 7.2.
1. Remove the top side panel fixing screw.
2. Disconnect the copper pipe from the bottom of the vessel.
3. Remove the top fixing nut from the air valve.
4. Remove the bottom fixing screw and withdraw the vessel taking care not to spill any water into other boiler components.
5. Re-assemble in reverse order.
6. Refill and pressurise the system. (Refer to Commissioning, Section 5.1).
7.19 COMBUSTION CHAMBER INSULATION
1. Remove the complete burner/fan/air inlet assembly as described in Routine Servicing, Section 6.3.
2. Open the three spring clips (see Fig. 6.5) and carefully lift off the insulation panel. It may be necessary to remove the
electrode assembly first as described in Section 7.3.
3. To remove the rear insulation panel, open the four clips and prise out the panel.
4. Fit the new panel(s) and re-assemble in reverse order referring to Routine Servicing, Section 6.5.
5. Test the boiler, check the ignition and test the combustion as described in Section 6
7.20 ALPHA CONTROLS (if fitted)
Refer to section 4.11 on the connection options for boiler controls.
Alpha E-Tec S 20 and 30 - Component Replacement
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