Alpha InTec2 26CE Installation And Servicing Instructions page 41

7.8 PCB - Fig. 7.2
Note: The replacement of the gas valve or PCB must be carried out by a Gas Safe registered engineer with the use of a flue
analyser.
Gain access as described in Section 7.1.
1. Unhook the ignition lead from the rear of the control panel, release the grommet and unplug the lead from the PCB.
2. Remove the three retaining screws in the PCB cover and remove cover. See Fig. 7.2.
3. Remove the PCB retaining screws.
4. Release the retaining clips, lift the PCB from the control panel and unplug the wire connections.
5. To maintain the boiler parameter setting, remove the memory chip from the removed PCB and insert into the new PCB.
6. Re-assemble in reverse order. Refer to the wiring diagram in Section 8.1 for connections.
When replacing the cover, ensure no wires are trapped and all wiring is secured. Secure with three screws - do not over
tighten.
7. Test the boiler and carry out the fast calibration as described in Section 5.13.
Note; If the original PCB memory chip is not used in the new PCB the boiler parameters will need to be set and full
calibration procedure is required.
7.9 GAS VALVE – BURNER INJECTOR
Note: The replacement of the gas valve or PCB must be carried out by a Gas Safe registered engineer with the use of a flue
analyser.
Isolate the boiler gas supply and gain access as described in Section 7.1.
1. Disconnect the electrical plug from the gas valve.
2. Remove the gas pipe retaining clip from the top of the gas valve and remove the pipe.
3. Disconnect the gas valve union beneath the boiler.
4. Remove the two screws from beneath the boiler and lift out the valve assembly.
5. Unscrew the injector from the top of the gas valve and transfer the injector to the new gas valve using a new washer.
6. Fit the new assembly and re-assemble in reverse order and test for gas tightness.
7. Light the boiler. (Refer to Commissioning, Section 5.4).
8. Test the boiler and carry out the fast calibration as described in Section 5.13.
7.10 CONDENSATE TRAP - Figs. 7.1 and 7.3
Gain access as described in Section 7.1.
Note: Before removing the trap, ensure that the water from the trap can be contained to avoid spillage.
1. Pull the flue drain hose off the top of the condense trap, cut the cable tie and pull the rubber condense hose adapter out
of the bottom of the boiler.
The cable tie is only to secure the adaptor during transit and installation, it is not required after removal.
2. Remove the trap fixing screw from the bottom of the boiler and turn the trap to the left to disconnect it from the
expansion valve outlet pipe.
3. Rotate the trap in a slight backwards motion to disconnect it from the flue manifold, being careful not to spill any
condense water, remove the trap from the boiler.
4. It is important to clean the trap every time the trap is removed to flush out any deposits from the collection bowl.
Note: Partially fill the trap before replacing.
7.11 DHW TEMPERATURE SENSOR - Fig. 7.3
Gain access as described in Section 7.1.
1. The DHW sensor is positioned in the hot water outlet pipe to the left of the flow switch, see Fig. 7.3. Unplug the two
connections and unclip the sensor from the pipe.
2. Re-assemble in reverse order with a new sensor.
7.12 COLD MAINS INLET SENSOR - Fig. 7.3
Gain access behind the front casing as described in Section 7.1.
1. Isolate the mains water supply and open all hot taps to drain any water from the boiler.
2. Remove the condensate trap assembly as described in Section 7.11.
3. Disconnect the wires from the sensor.
4. Withdraw the retaining clip and remove the inlet sensor.
5. Re-assemble in reverse order with a new sensor.
Alpha InTec² 26E, 30CE and 35CE - Component Replacement
41