Potterton Suprima 100, Installation & Service Instructions Manual

Page: 29 / 38

To Service the Boiler & Component Replacement - Page 29
4.3.11 Heat Exchanger
Warning:
For Sealed Systems relieve system pressure
through pressure relief valve before draining.
Gain General Access - See 4.1.
1. Drain the system at its lowest point.
2. Remove the fan and flue hood - See 4.3.8
3. Remove the burner - See 4.3.4.
4. Hold a suitable container under the left hand side of
the heat exchanger and unscrew the drain screw.
Drain the heat exchanger.
5. Remove the screws securing the combustion chamber
insulation assembly to the chassis and withdraw it.
6. Release both the flow and return nuts at the top of the
heat exchanger.
7. Support the heat exchanger, remove the four bolts
(Two each side) and carefully remove the heat
exchanger.
8. Replace rubber seals in flow and return ports, feed the
new heat exchanger into position ensuring the pipe
connections are correctly located.
9. Secure the heat exchanger with the four fixing screws
and tighten the two sealing nuts.
10. Re-assemble in reverse order.