Secondary Heat Exchanger - Potterton Performa 9 SL HE User Manual

9.15 Secondary Heat Exchanger

1. Perform General Access - See 9.2.
2. Drain the system as necessary.
3. Drain the Heat Exchanger - See 9.14, 4.
4. Remove the Spark Igniter - See 9.6.
To ease removal of the secondary heat
exchanger it may be necessary to:-
- Remove the Air Pressure Switch - See 9.5.
- Remove the air pressure switch mounting
bracket.
- Remove the Fan and Flue Hood - See 9.9.
- Disconnect secondary to primary heat
exchanger return pipe.
5. Remove the screw securing the flue duct
mounting bracket to the inner case and remove
the bracket - See Fig. 42.
6. Remove the two pipe clips securing the flow and
return pipes to the secondary heat exchanger.
7. Remove the Condensate Trap - See 9.13. This
will allow access through the hole in the case to
the rear sump screw.
8. Loosen the rear and remove the front sump
screws. Carefully slide the sump forwards to
remove from boiler.
9. Support the heat exchanger then remove the
screw and front supporting bracket.
10.Manoeuvre the heat exchanger out to
disconnect the gaitor and flue duct from the
hood, pull down to release the pipe 'O' ring
connections and lift away from the boiler.
11.Check and replace seals, washers, 'O' rings etc
as necessary. Lubricate 'O' rings prior to fitting.
12. Re-assemble as follows:-
- Align the flow and return pipes, lift the heat
exchanger slightly to engage the 'O' ring
joints and locate onto the rear case mounting
bracket.
- Re-fit the front mounting bracket and screw.
- Ensure the flow and return pipes are fully
engaged and re-insert the pipe clips to lock
them in position. Check the joints will not pull
apart.
- Re-connect the secondary to primary heat
exchanger return pipe.
© Baxi Heating UK Ltd 2008
Pipe clips
Sump
- Re-fit the sump.
- Re-fit the flue duct mounting bracket and
screw.
- Re-assemble all remaining parts in reverse
order.
13.Check the inhibitor concentration when
re- commissioning the system.
14.Vent all air from boiler and system before
firing boiler.
9.15
Spark igniter
9.15
Fig. 63
51