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Figure 30. Remove 5 Screws if Necessary
(either side of cabinet)
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 31 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.
Figure 31. Burner, Combustion Air Inducer Assembly & Heat Exchanger Removal
507332-02G / 31-5000663
14. Reinstall heat exchanger in vestibule. (Replace the
five 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.
18. Reconnect all wires.
19. Reconnect top cap and vent pipe to combustion air
inducer outlet.
20. Reconnect gas supply piping.
21. Turn on power and gas supply to unit.
22. Set thermostat and check for proper operation.
23. Check all piping connections, factory and field, for gas
leaks. Use a leak detecting solution or other preferred
means.
Some soaps used for leak detection are corrosive to
certain metals. Carefully rinse piping thoroughly after
leak test has been completed. Do not use matches,
candles, flame or other sources of ignition to check for
gas leaks.
24. If a leak is detected, shut gas and electricity off and
repair leak.
25. Repeat steps 24 and 26 until no leaks are detected.
26. Replace access panel.
Issue 2209
CAUTION
Page 33 of 35
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