Baxi ECOGEN 24/1.0, Installation & Servicing Instructions Manual

Page: 63 / 94

Fig. 63 ­ Fig. 65
page 64
14.15 Supplementary heat exchanger
Before starting this procedure ensure the appliance has cooled sufficiently to allow handling of the heat exchanger. If it is not intended to replace the heat exchanger ensure that
a service kit is on hand for reassembling.
1. Isolate the appliance from all services.
2. Use the drain point (
Fig. 66a ) to remove the system water from the appliance.
3. Remove the assemblies shown in sections 14.4 , the burner door assembly as described in 14.10 and the water flow switch as in section 14.14. Disconnect the flue and
remove the flue connector assembly by undoing the four self tapping screws.
4. Release the flow pipe from the supplementary heat exchanger ­ remove the spring clip ( Fig. 67 ). Undo the fitting at the top of the drain valve. Loosen the compression
fittings on the flow and return pipes to the appliance and then swing the pipes away from the supplementary heat exchanger.
5. Using a 5mm hex drive, undo and remove the clamping collar between the supplementary heat exchanger and the engine burner.
6. Disconnect the condense drain tube at the bottom back of the heat exchanger (
Fig. 67 ).
7. The supplementary heat exchanger will still contain system water so care is needed to be taken when it is lifted from the appliance. Ensure that the electrical connections
and the PCB area are protected from any possible spillages. Carefully lift the heat exchanger to the right of the appliance and pull forwards. Ensure that the drain extension
does not foul the engine burner insulation. There will still be system water in the heat exchanger so care needs to taken when handling to avoid accidental spillages.
8. Remove the supplementary return pipe from the supplementary heat exchanger by removing the two screws and the retaining plate ( Fig. 67 ).
9. Reassemble in the reverse order. Use a new engine burner/supplementary gasket and O rings. A kit of parts is provided with a new heat exchanger.