Potterton Promax 15 HE Installation And Servicing Instructions page 34

Combustion Box
Door Panel
Burner
Fig. 58
Securing Screws
Electrical Box
Mounting Plate
Electrical Box
Heat Exchanger
Assembly
34
Supplied By www.heating spares.co Tel. 0161 620 6677
Fig. 57
Flow
Switch
Securing
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).
IMPORTANT: On refitting the combustion box
door check the condition of the combustion
box door seals.
Support
13.12
Bracket
WARNING: The burner skin is fragile:
Return
Handle with care
Connection
1. Remove the two screws securing the burner to
the base of the combustion box.
Fig. 61
2. Remove the burner carefully from the
combustion box base.
3. Fit the new burner and reassemble in reverse
order.
13.13
1. Drain the boiler (see section 13.1 paragraph
2 & 3).
Screw
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. Remove the screws securing the heat
exchanger manifold and remove the manifold
(Fig. 60).
7. Lift the heat exchanger assembly and rotate
the bottom upwards whilst pulling it forwards out
of the airbox.
8. Fit the new heat exchanger and reassemble in
reverse order.
9. Recommission the boiler and check the
inhibitor concentration (see Section 6.2 and 10.1).
Burner
(Fig. 58)
Heat Exchanger