19
6.14
FLUE FAN & MIXER (fig. 27)
Carry out component removal procedure as de-
scribed in 6.4.
Unclip and remove the air chamber front and the
RH side covers. Slacken the gas pipe (
A
) at the air
box connection and swing/rotate of the fan assem-
bly. To remove the mixer (
B
) locate and remove
the three screws (
C
). To remove the fan (
D
),
disconnect the electrical connections attached to
the fan, locate and remove the four screws (
E
).
Gently ease the fan from its location.
Replace in the reverse order. Ensure all seals are
in good condition, taking care to ensure they are
replaced correctly.
6.15
BURNER (fig. 28)
Carry out component removal procedure as de-
scribed in 6.4.
Unclip and remove the air chamber front and the
RH side covers. Slacken the gas pipe (
A
) at the air
box connection and swing/rotate of the fan assem-
bly. Locate and remove the 3 internal nuts (
B
)
which secure the fan assembly in position (
C
) to
the heat exchanger (
D
). Gently ease the fan
assembly out of its location. Once the assembly
has been removed, the burner (
E
) can be with-
drawn from the heat engine. Ensure the seal (
F
) is
in good condition, taking care to ensure it is
replaced correctly. Replace in the reverse order.
6.16
MAIN HEAT EXCHANGER (fig. 29 & 30)
Carry out component removal procedure as de-
scribed in 6.4. Unclip and remove the three air
chamber covers (front, LH, RH sides). Disconnect
all the wiring connections.
Fig. 29:
Slacken the gas pipe (
A
) at the air box
connection and swing/rotate of the fan assembly.
Disconnect the flow (
B
), return (
C
) and condense
connections on the heat exchanger. Locate and
remove the 4-screws that secure the heat ex-
changer 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be lifted up and withdrawn from the appliance.
Fig. 30:
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 & DHW NON-RETURN
VALVE (fig. 31)
Carry out component removal procedure as de-
scribed in 6.4.
Remove the locking pin (
A
) that secures the cover
(
B
) to the hydraulic manifold. Using a hooked
piece of wire, carefully withdraw the by-pass
cartridge (
C
) and/or DHW non-return cartridge (
D
).
Ensure all seals are in good condition, taking care
Fig. 26
A
B
D
C
Fig. 27
E
A
B
C
D
D
C
E
F
B
A
Fig. 28
Fig. 30
A
B
Fig. 29
C
A
B
D
E