BLADES LCS PREMIUM PLUS WHP030, Installation & Service Manual

Page: 77 / 130

45
Alpha E-Tec S 20, 30 and 35 - Component Replacement
8.7 FUSE - Fig. 8.1
The fuse is located on the PCB.
1. Gain access to the rear of the control box as described in
Section 8.8.
2. Remove the three screws securing the PCB cover and remove cover.
2. Lift out and remove the fuse. Fit a 3.15 AF 250 V (20 mm x 5 mm)
fuse as a replacement. Check the spare fuse has the correct value
before installing it.
3. Re-assemble in reverse order.
8.8 PCB - Fig. 8.1
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 8.1.
1. Release the grommet and unplug the lead from the PCB.
2. Remove the three screws securing the PCB cover and remove cover.
3. Remove the PCB retaining screws.
4. Lift the PCB from the control panel and note the connections before unplugging the wire connections.
5. Re-assemble in reverse order. Refer to the wiring diagram in Section 9.1 for connections. When replacing the PCB
cover, ensure no wires are trapped and all wiring is secured. Secure cover with three screws - do not over tighten
6. Set the correct parameters for the correct boiler model as described in Section 7.13.
7. Test the boiler.
8.9 GAS VALVE - Fig. 8.2
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.
Isolate the boiler gas supply and gain access as described in Section 8.1.
1. Disconnect the electrical plug from the gas valve.
2. Remove the gas pipe retaining clip and remove the pipe.
3. Disconnect the gas valve union beneath the boiler.
4. Remove the two screws from beneath the boiler, disconnect the gas valve pressure tube and lift out the valve assembly.
5. Unscrew the brass union from the top of the gas valve and transfer it 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 6.4).
8. Test the boiler, check the ignition and test the combustion as described in Section 7.
8.10 CONDENSATE TRAP - Figs. 7.7 and 8.2
Gain access as described in Section 8.1.
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 condensate trap and pull the rubber condensate hose adapter out of the
bottom of the boiler. The cable tie is used for production and can be discarded.
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. Lift out the trap 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.
Fig. 8.1
PCB fuse PCB Pressure gauge