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12.0 Changing Components
40
12.24 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 left hand fan spigot outlet
pipe clamp. Ease the clamp to the right.
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.
12.25 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 Clamps 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