30
8.27 MAINS WATER INLET FILTER
1. The mains water inlet filter is located in the body of the DHW flow switch. Refer to Section 8.17 to remove the flow switch.
2. The filter can be removed using a small screwdriver.
3. Clean the filter and re-assemble in reverse order.
8.28 DIVERTER VALVE ASSEMBLY - Fig. 30
1. Gain access behind the front casing and drain the boiler heating circuit as described in Sections 8.1 and 8.2.
2. Remove the three screws securing the right hand side panel and slide the panel forwards to remove.
3. Remove the diverter valve motor as described in Section 8.14.
4. Remove the screw securing the fan inlet pipe and remove the pipe from the fan.
5. Remove the heating flow and return pipe-retaining clips from the primary heat exchanger and pull the pipes downwards from
the heat exchanger connections.
6. Remove the heating flow and return pipe-retaining clips from the diverter valve and withdraw from the diverter valve. Leave
the pipes in the back of the boiler.
7. Remove the DHW outlet pipe-retaining clip from the diverter valve and undo the nut connecting the other end to the DHW
temperature sensor housing. Withdraw the pipe from the diverter valve and leave inside the boiler.
8. Using a 4 mm Allen key undo the two cap head screws securing the DHW heat exchanger and push the heat exchanger to
the back of the boiler away from the diverter valve assembly.
9. Undo the heating flow valve and return valve from their boiler connections.
10. Completely remove the drain valve nipple from the boiler and undo the expansion relief pipe from the manifold.
11. Remove the four screws at the bottom of the boiler, either side of the flow and return connections, the two screws securing the
expansion relief valve and the left hand DHW manifold securing screw.
12. Lift the diverter valve and pump assembly and pull the diverter valve to the right to disconnect it from the pump housing.
13. Re-assemble in reverse order using new seals and washers.
14. Refill and pressurise the system. (Refer to Commissioning, Section 5.1).
8.29 EXPANSION VESSEL - Fig. 28
Note: Check that the pressure of the new vessel is 1 bar before it is installer.
1. Gain access behind the front casing and drain the boiler heating circuit as described in Sections 8.1 and 8.2.
2. Disconnect the pipe from the expansion vessel.
3. Remove the screw securing the top support bracket.
4. Remove the three screws securing the side panel and remove the panel.
5. Lift the expansion vessel out of the boiler.
6. When replacing the vessel, ensure that the connection is towards the left of the boiler and re-assemble in reverse order
using new seals as necessary.
7. Refill and pressurise the system. (Refer to Commissioning, Section 5.1).
8.30 CYCLONE (if wall jig is fitted) - Fig. 13
1. Remove the bottom tray and close the isolating valves either side of the cyclone.
2. Disconnect the unions from the cyclone. Remove the two screws securing the support bracket and remove the cyclone.
Re-assemble with a new cyclone.
3. Pressurise the system. (Refer to Commissioning, Section 5.1).
8.31 CONDENSATE TRAP - Fig. 13
1. Gain access behind the front casing as described in Section 8.1.
2. Disconnect the top and drain connection of the condensate trap.
3. Place a container under the boiler and unscrew the bowl at the bottom of the trap, see Fig. 13. Some water will spill from the
trap.
4. Remove the screw securing the trap to the bottom of the boiler casing and lift out the trap.
5. Fit the new trap in reverse order.
Note: Fill the new trap with water once installed.
Alpha CD25X/28X - Component Replacement
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