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cHANGING PArTS
9.0
9.5
HEAT EXcHANGEr
For access refer to section 9.1 General and 9.4 Burner Sub-Assembly. After
removing the burner sub assembly drain the unit and remover the friction fit
connection on the condense pipe from the bottom of the heat exchanger by
pulling downwards.
NOTE: To drain the boiler close the isolating valves provided at the bottom right
and left hand sides of the casing on the heating flow and return pipe work using a
flat headed screw driver, open the drain off tap (turn anticlockwise) provided to the
right hand side of the hydraulic monoblock assembly and open (turn anticlockwise)
the manual air vent provided on the top left hand side of the boiler casing.
Unscrew the manual air vent from the top of the boiler casing using a 17mm
AF spanner and release the flow and return connections from the quick release
connections provided on the hydraulic monoblock assembly – see below for
details.
Heat exchanger flow connection
Heat exchanger return connection
Then pull out the flow and return pipe work making sure not to damage the 'O'
rings. Remove the spring clips and pull out (downwards) the flow and return pipe
work from the bottom of the heat exchanger. Remove the split pin on each of the
two supporting clamps to the right hand side of the heat exchanger and release
the two spring clips. Pull the heat exchanger up and then forward to fully release
it from the flow and return pipework.
Page 35
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