Figure 68 Example of cross-tightening of screws
3. Reinstall the lid and burner components.
4. Reinstall the fan gasket and fan. Replace gasket if necessary.
5. Reconnect the ignitor electrical cable and green grounding wire.
6. Insert the air intake tube into the air filter box.
7. Reinstall the mixer, gas line and gas valve assembly, ensuring that the mixer gasket is in
place.
8. Attach the mixing device to the fan with the bolts.
9.
Replace the bolts on the right side of the gas valve.
Figure 69 Bolts on right side of gas valve
10. Reattach the electrical connectors to the gas valve.
11. Reattach the silicone tube.
12. Fit the air intake tube onto the mixing device.
13. Secure the air intake gasket and clamp components to the filter box.
14. Reattach the two electrical connectors to the front and back of the fan.
15. Reinstall the boiler's top panel and then the front cover.
7.2.3 Replacing the burner in the EX 400 and 500 models
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