Ideal Boilers Optia HE 9 Installation And Servicing Instructions

Optia HE - Installation & Servicing 39SERVICING72 AIR PRESSURE SWITCH (APS) REPLACEMENT1. Refer to Frame 61.2. Remove the two fan electrical connections, the redpressure sensing pipe, the blue CO/CO 2 sensingpipe and the two fan fixing screws.3. Pull the fan forward, remove and retain.4. Fit the new fan and reassemble in reverse order,ensuring the fan leads, 2 sensing tubes and the twofan fixing screws are reconnected.5. Check the operation of the boiler.71 FAN REPLACEMENT5. Disengage the PCB from the mounting posts and withdrawfrom the control box.6. Fit the new PCB and reassemble in reverse order.7. Check the operation of the boiler.Fuse.To change the fuse, prise it out of the holder and disengagethe fuse. Refer to Frame 78 for fuse location.1. Refer to Frame 61.2. Remove the APS fixing screw.3. Remove the 2 sensing tubes from the APS.4. Remove the 3 electrical connections from the APS.5. Fit the new APS and reassemble in reverse order.6. Check the operation of the boiler.73 PRINTED CIRCUIT BOARD (PCB) REPLACEMENT1. Refer to Frame 61.2. Remove the control box fixing screws and swing thecontrol box down into the servicing position.3. Disconnect the detection lead from the PCB.4. Unplug all the Molex connectors from the PCB.74 COMBUSTION CHAMBER INSULATION REPLACEMENT1. Refer to Frame 61.2. Remove the burner and air box assembly. Refer toFrame 54.3. Remove the 4 tie rods.Note. remove rubber grommets to gain access toside tie rod screwdriver slots.4. Remove the combustion chamber.5. Remove the 2 side panel retaining brackets.6. Remove the side insulation panels.7. Remove the front and rear insulation panels.8. Fit the new front and rear insulation panels.9. Fit the new side panels and retain with thebrackets and screws previously removed.10. Reassemble in reverse order.red32whiteredvioletyellow4FixingscrewsAir pressure switch &CO/CO 2 sensing pipes Electricalconnections3SERVICING