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12.0 CHANGING COMPONENTS
38
Publication No. 5111811
12.23 Secondary Heat Exchanger (Fig. 73)
1. Drain the primary circuit
2. Undo the four screws securing the right hand
case panel. Remove the panel.
3. Prise the connecting clips from the heat
exchanger return pipe and the boiler return pipe.
Remove the pipes.
4. Slacken the screws on the fan spigot outlet
pipe clamp. Ease the clamp to the left. Undo the
screw at the left hand end of the pipe.
5. Remove the nut securing the elbow to the
secondary heat exchanger. Draw the elbow and
outlet pipe forwards.
6. Remove the secondary heat exchanger from
the outer drum by easing it forward.
7. Reassemble in reverse order of dismantling.
12.24 Flue Overheat Thermostat (Fig. 74)
NOTE: The flue overheat thermostat includes
a reset button. Check that the thermostat will
not reset before replacing.
1. Remove the fan spigot outlet pipe from the fan
and elbow.
2. Pull the two wires off the terminals on the flue
overheat thermostat. Unscrew the thermostat
from the adaptor in the outlet elbow.
3. Reassemble in reverse order of dismantling.
Ease Fan Spigot Outlet
Pipe Clamp Inwards
Overheat Thermostat
Fan Spigot Outlet
Pipe Clamp
Fan Spigot
Outlet Pipe
Secondary
Heat Exchanger
Outer Drum
Boiler Return Pipe
Pipe Connecting Clip
Elbow
Heat Exchanger
Return Pipe
Fig. 73
Fig. 74
Fan Spigot Outlet Pipe