Alpha CB28 - Page 22

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Alpha CB24/28 - Component Replacement
8.10 GAS VALVE - Fig. 21
1. Gain access behind the casing as in section 8.1.
2. Disconnect the coil wires and pressure tube from the gas
valve.
3. Loosen the one screw (see Fig. 21) securing the electrical
plug and disconnect the plug.
4. Disconnect the burner manifold union and the gas inlet
pipe union from the manifold.
5. Remove the two manifold screws from beneath the boiler.
6. Carefully push the valve towards the rear of the boiler (take
care not to damage the manifold sealing washer) and lift
out the valve assembly.
7. Fit the new assembly and re-assemble in reverse order.
8. Light the boiler and test for gas soundness. (Refer to
Commissioning, section 5.4).
9. Complete re-assembly as described in Routine Servicing,
section 7.4 paragraphs 5 to 9.
8.11 VIEWING WINDOW
1. Gain access behind the casing as in section 8.1.
2. Remove the rubber window frame and remove the damaged glass.
3. Re-assemble in reverse order with a new glass. Ensure the rubber frame is located correctly in the front panel.
Fig. 20
Fig. 21