Ideal Boilers Optia HE 9 Installation And Servicing Instructions

38 Optia HE - Installation & ServicingSERVICING70 GAS CONTROL VALVE REPLACEMENT1. Refer to Frame 61.2. Remove the burner and air box assembly. Refer toFrame 54.3. Remove the control box fixing screws.Swing the control box down into the servicing position.4. Disconnect the gas control valve electrical leads.5. Undo the gas cock union .6. Whilst supporting the gas control valve, remove the 2screws retaining the manifold to the back panel.7. Remove the gas control / manifold assembly.8. Remove the 4 screws retaining the manifold to the gascontrol valve, and fit the manifold to the new valve.Ensure that the new control is fitted the correct wayround (an arrow engraved on back indicates thedirection of flow).9. Transfer the gas cock union to the new gas controlvalve, using an approved jointing compound.10. Reassemble in reverse order.11. Check the operation of the boiler.12. Refer to Frame 48, item 18 for gas adjustment sealing.1. Refer to Frame 61.2. Remove the burner and air box assembly. Refer to Frame 54.3. Remove the electrode retaining nut.4. Remove the pilot shield.5. Remove the ignition electrode and integral lead.6. Refit the new electrode and lead in reverse order.Ensure that the pilot shield is replaced.7. Check the spark gap. Refer to Frame 67.8. Reassemble in reverse order.9. Check the operation of the boiler.68 IGNITION ELECTRODE AND LEAD REPLACEMENT1. Refer to Frame 61.2. Remove the screw retaining the frontburner support strap to the combustionchamber.3. Remove the M5 pozi screw, situated at theleft hand bottom rear of the burner. Pullthe burner downward to disengage theretention tab and remove the burner.4. At this stage the main burner injector canbe removed, checked, cleaned orreplaced as required. Ensure that a newcopper sealing washer is used.5. Fit the new burner, ensuring that theretention tab is correctly located in the airbox slot and reassemble in reverse order.6. Check the burner for cross-lighting andflame stability.69 MAIN BURNER AND MAIN BURNER INJECTOR REPLACEMENTSERVICING