750-392
CBEX-DE
5-9
Gas Burner Maintenance
5.9 — Gas Burner Maintenance
The gas burner components should be inspected for evidence of damage due to improperly adjusted combustion.
Combustion adjustments should be checked monthly.
Check periodically for a proper seal between the end of the burner housing
and boiler refractory. Any deterioration of the seal should be corrected, as an
improper or poor seal allows air leaks, which can cause overheating or burn-
ing of the burner housing.
Inspect the silicone tape seal on the burner mounting plate. Replace if worn
or out of position.
Whenever the burner is removed, the diffuser, gas housing and gas spuds
should be checked for any deterioration. Verify that the diffuser skirt con-
forms to the bore of the burner housing so as to minimize the amount of
combustion air which bypasses the diffuser. Check to see that the diffuser is
properly located in reference to the gas spuds. There should be 1/4”
between the edge of the diffuser fins and the gas spuds when the burner is
installed. Check to see that the diffuser fins do not interfere with the gas
ports or gas spuds in the burner housing.
Check the electrode setting for any cracks that might be present on the por-
celain insulator. Replace the electrode if cracking is evident since cracking
can cause grounding of the ignition voltage. Inspect the tip of the electrode for signs of pitting, combustion
deposits and wear, dressing as required with a fine file.
Periodically remove the access plug from the gas pilot venturi and clean out any accumulated lint or other foreign
material.
Check the ignition cables for cracks in the insulation. Verify that all connections between the transformer and the
electrode are tight.
SILICONE
TAPE
FIGURE 5-3. Silicone seal
ACCESS
PLUG
FIGURE 5-4. Gas pilot venturi
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