13.0
Changing Components
47
© Baxi Heating UK Limited 2005
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. 21 & 13. 25).
1. Remove the combustion box door by undoing the
four
1
/
4
turn securing screws.
13.25
Burner
(Fig. 69)
WARNING: The burner skin is fragile
(133 model): (HANDLE WITH CARE)
1. Remove the two 8mm hex head screws securing the
burner to the base of the combustion box.
2. Remove the burner carefully from the combustion box
base, inspect gasket for damage, replace if necessary.
3. Fit the new burner and reassemble in reverse order.
13.26
Heat Exchanger
1. Drain the boiler (see section 13.1 paragraph 2 & 3).
WARNING: The PCB Control and Fan
Assembly is 325 Vdc. Isolate at supply before
access.
2. Remove the fan and condensate trap (see section
13.21 and 13.24).
3. Undo the screws securing the flow switch and return
connections. Remove the flow switch and return
connection (Fig. 70).
4. Undo the screws securing the heat exchanger manifold
and remove the manifold (Fig. 71).
5. Undo the screws on the bracket supporting the heat
exchanger and remove bracket.
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 6.1 and 10.1).
Fig. 69
Securing
Screws
Fig. 70
Burner
Flow
Switch
Return
Connection
Heat Exchanger
Manifold
Fig. 71
Fig. 72
Heat Exchanger
Assembly
100 & 80 HE
Burner
