Inspection and Maintenance
8-14
750-211 (revised 2009)
Promethean Boilers, Model 4WI Manual
8.8 — 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. See Section 6.20 in Chapter 6.
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.
Whenever the burner is removed, the diffuser, gas housing and gas spuds (HTB model only) should be checked for
any deterioration. Verify that the diffuser skirt conforms to the bore of the burner housing so as to minimize the
amount of combustion air which bypasses the diffuser. If the burner is a high turndown burner (HTB) model,
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. See Section 6.22 in Chapter 6 for more information.
Check the electrode setting for any cracks that might be present on the porcelain 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.
FIGURE 8-17. Oil Pilot Electrode Settings
Periodically remove the access plug from the gas pilot aspirator 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.
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