8.22 DIVERTER VALVE CARTRIDGE - Fig. 8.2
Gain access and drain the boiler heating circuit as described in Sections 8.1 and 8.2.
1. Remove the diverter valve motor as described in Section 8.21.
2. Using the supplied tool and a suitable spanner turn the diverter valve cartridge anticlockwise until its retaining lugs hit
the stops.
3. Withdraw the cartridge taking care not to spill any water onto any electrical components.
4. Insert the new cartridge with the locating lug at the top and push firmly into place. Using the supplied tool and a suitable
spanner turn the cartridge clockwise until the retaining lugs are locked into position.
5. Pull the diverter pin fully out into the CH position and connect the diverter motor as in Section 8.21.
6. Test the boiler in heating and hot water mode to ensure the motor is correctly engaged with the diverter valve spindle.
8.23 EXPANSION VESSEL - Fig. 7.9
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 8.1 and 8.2.
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 6.1).
8.24 COMBUSTION CHAMBER INSULATION
1. Remove the complete burner/fan/air inlet assembly as described in Routine Servicing, Section 7.3.
2. Remove the electrode assembly as described in Section 8.3.
3. Carefully prise off the insulation panel with a suitable blade.
4. Carefully remove any adhesive left on the alluminum gas manifold (burner door).
5. For Plus 28NX, 33NX - The replacement insulation panel does not require any adhesive as its shape provides a good
seal on the front panel.
For Plus 38NX - Apply the silicone on the front panel in the same positions where previously removed. Fit the new
insulation and keep it pressed for 10-15 seconds.
6. Re-assemble in reverse order, replacing the electrode with a new gasket.
7. Test the boiler, check the ignition and test the combustion as described in Section 7.
8.25 REAR COMBUSTION CHAMBER INSULATION
1. Remove the complete burner/fan/air inlet assembly as described in Routine Servicing, Section 7.3.
2. Remove the insulation by using a screwdriver until you uncover the clip in the centre of the panel and pull out the panel.
3. Clear any dust residue with a vacuum cleaner.
4. Remove the clip with a pair of pliers.
5. Remove the silicone with a cutter from the rear of the heat exchanger and clear any dust residue with a vacuum cleaner.
6. Check the integrity of the stud in the rear of the heat exchanger.
7. Apply the silicone in a circle with a diameter of 125mm.
8. Remove the film from new panel and insert it in the combustion chamber: it is advisable to keep it slightly inclined during
the introduction to avoid damage.
9. Press the centre of the insulation with a punch until the clip has become stuck in the stud and keep the panel pressed
for 10-15 seconds.
10. Re-assemble in reverse order referring to Routine Servicing, Section 7.5.
11. Test the boiler, check the ignition and test the combustion as described in Section 7.
8.26 ALPHA CONTROLS (if fitted)
Refer to section 5.11 on the connection options for boiler controls.
Alpha E-Tec Plus 28NX, 33NX and 38NX - Component Replacement
59
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