Baxi Barcelona System Installation And Servicing Instructions page 36

13.0 Changing Components - Page 36
The burner and heat exchanger can be changed after
removal of the combustion box door. To change the
heat exchanger, the fan and burner must be removed
first (see section 13.17 & 13.21).
1. Remove the combustion box door by removing the four
securing screws (Fig. 68).
13.21 Burner (Fig. 69)
WARNING: The burner skin is fragile:
Handle with care
1. Remove the two screws securing the burner to the base
of the combustion box.
2. Remove the burner carefully from the combustion box
base.
3. Fit the new burner and reassemble in reverse order.
Fig. 70
13.22 Heat Exchanger
1. Drain the boiler (see section 13.1 paragraph 2 & 3).
2. Remove all components in the base of the airbox.
3. Remove the screws securing the flow switch and return
connections and remove the connections (Fig. 70).
4. Remove the electrical connections from the
P.C.B.s.
5. Remove the screws securing the heat exchanger
manifold and remove the manifold (Fig. 71).
6. Lift the heat exchanger assembly (Fig. 72) and rotate the
bottom upwards whilst pulling it forwards out of the airbox.
7. Fit the new heat exchanger and reassemble in reverse
order.
8. Recommission the boiler and check the inhibitor
concentration (see Section 6.2 and 10.1).