Installation Guide

507332-01 Page 31 of 35Issue 1723
7. Remove screws securing burner box and remove
burner box.
8. NOX units only - Remove screw securing NOX insert.
Remove NOX insert. See Figure 29.
9. Remove screws from both sides, top and bottom of
vestibule panel.
10. Remove heat exchanger. It may be necessary to
spread cabinet side to allow more room. If so, remove
ve screws from the left side or right side of cabinet.
See Figure 31.
11. Backwash using steam. Begin from the burner opening
on each clam. Steam must not exceed 275° F.
12. To clean burners, run a vacuum cleaner with a soft
brush attachment over the face of burners. Visually
inspect inside the burners and crossovers for any
blockage caused by foreign matter. Remove any
blockage. Figure 30 shows burner detail.
13. To clean the combustion air inducer visually inspect
and using a wire brush clean where necessary. Use
compressed air to clean off debris and any rust.
14. Reinstall heat exchanger in vestibule. (Replace the
ve screws in the cabinet from step 10 if removed).
15. NOx units only - Replace NOx inserts.
16. Reinstall collector box and combustion air assembly.
Reinstall all screws to the collector box and combustion
air inducer. Failure to replace all screws may cause
leaks. Inspect gaskets for any damage and replace if
necessary.
17. Reinstall burner box, manifold assembly and burner
box cover.
Figure 29. NOx Inserts
Figure 30. Burner, Combustion Air Inducer Assembly & Heat Exchanger Removal