Potterton Suprima 30, Installation And Service Instructions Manual

Page: 31 / 37

To Service the Boiler & Component Replacement - Page 31
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 4.8
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.