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15.0 Changing Components
47
© Baxi Heating UK Ltd 2011
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 13.6 and 13.10).
1. Remove the combustion box door by removing the
four securing screws (Fig. 55).
IMPORTANT: On refitting the combustion box
door check the condition of the combustion box
door seals.
15.12 Burner (Fig. 56)
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. Check the burner seal on the heat exchanger base,
replace if necessary. Fit the new burner and reassemble
in reverse order.
15.13 Heat Exchanger
1. Drain the boiler (see section 13.1 paragraph 2 & 3).
2. Remove all components in the base of the airbox.
3. Undo the screws on the support bracket. Remove
the screws securing the flow switch and return
connections and remove the connections (Fig. 57).
4. Remove the screws securing the heat exchanger
manifold and remove the manifold (Fig. 58).
5. Ease the combustion box left hand side panel to clear
the stud, lift the heat exchanger assembly (Fig. 59) and
rotate the bottom upwards whilst pulling it forwards
out of the airbox.
6. Ensure that the heat exchanger is disengaged from
the flue elbow and clear of the stud in the left hand side
of the combustion box.
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).
Combustion Box
Door Panel
Burner
Securing Screws
Fig. 55
Fig. 56
Fig. 58
Fig. 59
Fig. 57
Heat Exchanger
Manifold
Return
Connection
Flow
Switch
Heat Exchanger
Assembly
Support
Bracket