Replacing the burner on the SL 40-399 G3
For reference, see Figure 42 .
To remove the burner:
1. Turn off the electric power and gas supply to the boiler.
2. Ensure that the boiler cools down to the surrounding temperature. Do not drain the boiler
unless freezing conditions are expected during this procedure.
3.
Remove the cabinet door, and then remove the top cover/lid.
Warning
Wear a suitable protective mask to avoid ingesting particles from the refractory.
4. Note the colors and orientation of the electrical wires before disconnecting them from the gas
valve.
5.
Remove the 4 bolts on the gas valve connector outlet , and move the gas valve out of the
way. Retain the O-ring, or replace if worn.
6. Disconnect the electrical wires of the fan.
7. Remove the 4 nuts securing the fan to the heat exchanger lid.
8. Remove the fan and the fan gasket.
9. Remove the wires attached to the ignitor.
10. Remove the ignitor and gasket.
11. Loosen the lid fasteners located around the top edge of the heat exchanger, and swing the
bolts off the lid and let them hang down.
12. Remove the heat exchanger lid-burner assembly, and place upside down on a clean dry
surface.
13. Remove the heat exchanger lid gasket.
14. Wearing a mask and gloves, carefully remove the refractory. Inspect for damage and replace if
necessary.
15. When separating the burner from the heat exchanger lid, gradually loosen the mounting
screws in a criss-cross pattern.
16. Remove the burner gasket. Replace if damaged or worn.
7.3.3 Replacing the burner
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