Potterton Promax 15 HE Installation & Service Instructions Manual page 36

Combustion Box
Door Panel
Burner
Fig. 58
Securing Screws
Electrical Box
Mounting Plate
Electrical Box
Heat Exchanger
Assembly
36
Fig. 57
Securing
Screw
Securing
Screw
Fig. 59
Fig. 60
Heat Exchanger
Manifold
13.0 CHANGING COMPONENTS
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 13.8).
1. Remove the combustion box door by removing the
four securing screws (Fig. 57).
1. Remove the two screws securing the burner to the
base of the combustion box.
Support
Bracket
2. Remove the burner carefully from the combustion
box base.
Return
Connection
3. Fit the new burner and reassemble in reverse
order.
Fig. 61
1. Drain the boiler (see section 13.1 paragraph 2&3).
Flow
Switch
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. 61).
4. Remove the electrical connections from the
P.C.B.s (see section 13.4 & 13.5).
5. Loosen the two screws securing the electrical box
mounting plate and remove the assembly (Fig. 59).
6. Undo the M6 hex headed bolt on the left hand side
of the combustion box.
7. Remove the screws securing the heat exchanger
manifold and remove the manifold (Fig. 60).
8. Lift the heat exchanger assembly and rotate the
bottom upwards whilst pulling it forwards out of the
airbox.
9. Fit the new heat exchanger and reassemble in
reverse order.
10. Recommission the boiler and check the inhibitor
concentration (see Section 6.2 and 10.1).
IMPORTANT: On refitting the combustion box
door check the condition of the combustion box
door seals.
13.12 Burner (Fig. 58)
WARNING: The burner skin is fragile:
Handle with care
13.13 Heat Exchanger
Publication No. 5106451