To install the new burner:
1. Install the new burner and gasket, tightening the screws evenly in a criss-cross pattern. Do
not over tighten; tighten by hand plus a ½ turn to maintain a good seal and prevent
deformation of the burner flange.
2. Reinstall the refractory, lining up the ignitor holes with the holes on the heat exchanger lid.
3. Turn over the burner-lid assembly, and install the ignitor gasket and ignitor (tightening its
screws by hand plus an extra 1/8 of a turn).
4. Reinstall the heat exchanger lid gasket. Ensure that the lid gasket is in good condition, and
is in place and level.
5. Reinstall the heat exchanger lid-burner assembly.
6. Replace the lid fasteners. Evenly tighten the bolts in a criss-cross pattern.
7. Reattach the ignitor wires.
8. Reinstall the fan gasket and fan, securing with the four nuts.
9. Reconnect the fan electrical wires.
10. Ensure that the gas valve O-ring is installed before reattaching the gas valve to the gas
valve connector with the 4 bolts.
11. Reconnect the electrical wires (paired colors in correct orientation) to the gas valve.
12. Open up the gas supply valve, and check for leaks.
13. Tune the gas valve.
Figure 44 Order for tightening screws - SL 40-399 G3
Section: Service and maintenance
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