Alpha CD25C Installation And Servicing Instructions page 30

8.26 MAINS WATER INLET FILTER
1. The mains water inlet filter is located in the body of the DHW flow switch. Refer to Section 8.14 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.
8.27 DIVERTER VALVE ASSEMBLY - Fig. 33
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 diverter valve motor as described in Section 8.14.
3. Unplug the overheat thermostat connections.
4. Remove the heating flow pipe retaining clip from the diverter valve and undo the pipe connection at the heat exchanger.
Rotate the pipe to the left and lift upward to remove it from the diverter valve.
5. Remove the heating return pipe retaining clip from the pump housing and undo the pipe connection at the heat exchanger.
Pull the pipe from the pump housing and remove.
6. Remove the DHW outlet pipe retaining clip from the diverter valve and undo the nut connecting the other end to the DHW
switch housing and remove the pipe.
7. Using a 4 mm Allen key, undo the two cap head bolts securing the DHW heat exchanger and remove the heat exchanger.
8. Remove the heating flow valve from the bottom of the boiler and undo the return valve from its boiler connection.
9. Remove the four screws at the bottom of the boiler, either side of the flow and return connections and the two screw either
side of the expansion relief pipe.
10. Remove the securing screws at the front top and bottom corners of the right hand side panel. This will provide some
sideways movement to allow more room to release the valve.
11. Lift the assembly up slightly and pull the diverter valve to the right and off the automatic by-pass.
12. Re-assemble in reverse order using new seals and washers.
13. Refill and pressurise the system. (Refer to Commissioning, Section 5.1).
8.28 EXPANSION VESSEL - Fig. 12
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. Lift the expansion vessel out of the boiler.
5. 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.
6. Refill and pressurise the system. (Refer to Commissioning, Section 5.1).
8.29 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).
8.30 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 CD25C/28C/35C - Component Replacement
30