Heat Exchanger; Burner; Injectors - Baxi Luna 3 Comfort Series Installation And Servicing Instructions

1. Note the positions of the two sensing tubes on the outlet elbow and three wires on the fan motor and remove them.
. Slacken the screws on the outlet sealing collar.
Ease the collar upwards as far as possible.
3. Remove the four screws securing the combustion box door and remove the door.
4. Remove the spring clips retaining the air box side baffle plates. Disengage the tabs on the baffles from the slots in the
fan hood.
5. Undo the screws securing the fan hood to the appliance back panel, and draw the fan and hood assembly forwards.
6. Drain the primary circuit. Prise the two pipe connecting clips off the joints in the flow and return pipes.
7. Lift the heat exchanger to disconnect the flow and return pipe joints. Withdraw it from the appliance, taking care not
to damage the rear insulation piece.
8. Fit the new heat exchanger.
9. Reassemble in reverse order of dismantling, and repressurise the system.
1. Remove the four screws securing the combustion box door and remove the door.
. Undo the screws securing the burner to the injector manifold. Draw the burner out of the combustion box, pulling the
electrode grommets from the slots in the combustion box lower panel.
3. Disconnect the electrode leads and grommets from the electrodes. Completely remove the burner.
4. Undo the screws securing the electrodes to the burner. Examine the condition of the electrodes, replacing if necessary.
Fit the electrodes to the new burner.
5. Engage the burner location brackets over the studs on the injector manifold and reassemble in reverse order.
Electrode Grommets
1. Remove the burner as described in Section 14.3.
. Undo the screws securing the injector manifold to the inlet elbow and remove the manifold.
3. Unscrew and replace injectors as required and examine the sealing gasket, replacing as necessary. Reassemble in
reverse order.
InstructIons pertaInInG to tHe Installer

14.2 - heat exchanger

14.3 - burner

Electrodes
Electrode Leads

14.4 - injectors

(fig. 32)
Burner
Fig. 3
(fig. 33)
3
95.188.3 - GB