Benchmark Alpha InTec 24X Installation And Servicing Instructions page 33

7.14 ALPHA CONTROLS (if fitted) - Fig 24
Note: For replacement only use an Alpha single channel control. Do not fit a t o channel control.
1. Gain access behind the control panel as described in Section 7.1.
2. Remove the three screws securing the terminal block cover at the rear of the panel.
3. Disconnect the wiring from the control.
4. Remove the three control retaining screws and withdraw the control from the panel.
5. Fit the new control, and connect the wires as follows:-
Blue to terminal 1, Brown to terminal 2 and Red wires to terminals 3 and 4, (or as per the instructions supplied with the
control).
6. Re-assemble in reverse order. Refer to the User's instructions and the boiler's control cover to set the control.
7.15 DHW TEMPERATURE SENSOR - Fig. 32
1. The DHW sensor is positioned in the hot water outlet pipe to the left of the fl w switch, see Fig. 34. Unplug the two
connections and unclip the sensor from the pipe.
2. Re-assemble in reverse order with a new sensor.
7.16 COMBUSTION CHAMBER INSULATION
Gain access to the combustion chamber as described in Section 7.1.
Front panel insulation - Fig. 29
1. Remove the electrodes from the combustion chamber front as described in Section 7.3.
2. Remove the four screws securing the burner.
3. Carefully remove the insulation.
Back panel insulation - Fig. 33
1. Remove the combustion chamber front/burner assembly.
2. Carefully remove the insulation, suction applied to the centre of the insulation will aid this.
Fit a new panel and re-assemble in reverse order.
7.17 CONDENSATE TRAP - Figs. 13 and 32
1. Gain access behind the front casing as described in Section 7.1.
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.
7.18 CYCLONE (if wall jig is fitted) - Fig 13
1. Remove the bottom tray and close the heating return 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).
7.19 HEAT EXCHANGER THERMAL FUSE - Fig. 33
Note: If the thermal fuse has failed or operated, the heat exchanger must be
replaced. Do not attempt to remove the thermal fuse. Disturbing the sealant
securing the thermal fuse will invalidate the warranty.
1. Gain access behind the front casing as described in Section 7.1.
2. Disconnect the wire from the thermal fuse and remove the heat exchanger
as described in Section 7.21.
3. Fit a new heat exchanger and re-assemble in reverse order.
Manual air vent
Alpha InTec C and X - Component Replacement
Thermal fuse
Back panel
insulation
Fig. 33
33