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21
Fig. 26
C
A
B
D
E
Fig. 27: To remove the fan burner assembly (A)
locate and remove the 3 external nuts (B). Replace
in the reverse order. Ensure all seals are in good
condition, taking care to ensure they are replaced
correctly.
6.17
AUTOMATIC BY-PASS (fig. 28)
Carry out component removal procedure as
described in 6.4.
Disconnect and remove the flow pipe at the heating
manifold (1) and at the connection to the air
chamber. Using a hooked piece of wire, carefully
withdraw the bypass cartridge (2).
Ensure all seals are in good condition, taking care
to ensure they are replaced correctly. Replace in
the reverse order ensuring the cartridge is facing
the correct way.
Fig. 27
A
B
Fig. 29
A
B
Disconnect the flow (B), return (C) and condense
connections on the heat exchanger. Locate and
remove the 4-screws that secure the heat exchanger
to the combustion chamber (D). Move the heat
exchanger to the right and disconnect it from the
flue collector (E). The heat exchanger can now be
lifted up and withdrawn from the appliance.
6.18
EXPANSION VESSEL (fig. 1)
Should the removal and replacement of the
expansion vessel be deemed impractical, an
external expansion vessel may be fitted to the
return pipe as close to the appliance as possible.
6.18.1 EXPANSION VESSEL REMOVAL (with
sufficient clearance above, fig. 29)
Carry out component removal procedure as described
in 6.4. Disconnect the flue from the appliance.
Disconnect the flexible expansion pipe from the vessel.
Unscrew the nut that secures the vessel to the lower
frame. Locate and remove the screws (A) that secure
the vessel top holding plate (B), remove the plate. The
expansion vessel can now be removed. Replace in
the reverse order. Ensure all seals are in good condition,
taking care to ensure they are replaced correctly.
6.19
CONDENSE TRAP REMOVAL (fig. 30)
Carry out component removal procedure as
described in 6.4. Disconnect the 2 upper rubbers
condense pipe (A). Remove the pin (B) that secures
the trap to the air box plate. Disconnect the lower
rubber condense pipe (C) from the condense trap.
Carefully remove the condense trap. Replace in
the reverse order.
A
B
C
C
Fig. 30
2
1
Fig. 28
A
B